Stock Based Compensation |
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| Share-based Payment Arrangement, Noncash Expense [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stock-Based Compensation |
10. Stock-Based Compensation
2016 Equity Incentive Plan
On April 5, 2016, the Company’s board of directors adopted the 2016 Equity Incentive Plan (the “2016 Plan”) as the successor to the 2015 Omnibus Plan (the “2015 Plan”). The 2016 Plan was approved by the Company’s stockholders and became effective on May 18, 2016 (the “2016 Plan Effective Date”).
Upon the 2016 Plan Effective Date, the 2016 Plan reserved and authorized up to 600,000 additional shares of common stock for issuance, as well as 464,476 unallocated shares remaining available for grant of new awards under the 2015 Plan. An Amended and Restated 2016 Equity Incentive Plan (the "2016 Amended Plan") was approved by the Company's stockholders in May 2018, which increased the share reserve by an additional 1.4 million shares. A Second Amended and Restated 2016 Equity Incentive Plan (the "2016 Second Amended Plan") was approved by the Company's stockholders in August 2019 which increased the share reserve by an additional 850,000 shares. During the term of the 2016 Second Amended Plan, the share reserve will automatically increase on the first trading day in January of each calendar year by an amount equal to 4% of the total number of outstanding shares of common stock of the Company on the last trading day in December of the prior calendar year. As of September 30, 2019, there were 1,963,869 shares available for future issuance under the 2016 Amended Plan.
Option grants expire after ten years. Employee options typically vest over three or four years. Options granted to directors typically vest over one or three years. Directors may elect to receive stock options in lieu of board compensation, which vest immediately. For stock options granted to employees and non-employee directors, the estimated grant date fair market value of the Company’s stock-based awards is amortized ratably over the individuals’ service periods, which is the period in which the awards vest. Stock-based compensation expense includes expense related to stock options, restricted stock units and ESPP shares. The amount of stock-based compensation expense recognized for the three and nine months ended September 30, 2019 and 2018 was as follows:
In April 2019, the former CEO resigned, however he remains on the Company's board of directors. Subsequent to his resignation, during the second quarter of 2019, the former CEO agreed to forfeit the unvested portion of his equity awards granted to him during his service as CEO. As a result, he forfeited a total of 1,489,583 equity awards, which included 689,583 unvested service-based vesting options, 500,000 unvested market-based options and 300,000 unvested restricted stock units. The Company accounts for forfeitures as they occur. Because the requisite service period of 2.8 years was not rendered for the market-based options, the forfeiture of the market-based options resulted in the reversal in the second quarter of 2019 of the full expense recognized to date of $0.5 million, which was recorded as a reduction to general and administrative expense. Stock-based compensation during the three and nine months ended September 30, 2018 includes $0.3 million of expense related to modifications of awards related to a separated executive.
Stock options with service-based vesting conditions
The Company has granted awards that contain service-based vesting conditions. The compensation cost for these options is recognized on a straight-line basis over the vesting periods. A summary of option activity for the nine months ended September 30, 2019 is as follows:
The aggregate intrinsic value of stock options is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s common stock for those stock options that had exercise prices lower than the fair value of the Company’s common stock. As of September 30, 2019, the aggregate intrinsic value of options outstanding and currently exercisable was $1.3 million and $0.9 million, respectively. The total grant date fair value of shares which vested during the nine months ended September 30, 2019 was $1.3 million. The per‑share weighted‑average grant date fair value of the options granted during the nine months ended September 30, 2019 was estimated at $3.08. There were 622,583 options that vested during the nine months ended September 30, 2019 with a weighted average exercise price of $3.54 per share.
The Company recognized stock-based compensation expense of $0.6 million and $1.6 million related to stock options with service-based vesting conditions for the three and nine months ended September 30, 2019, respectively. At September 30, 2019, there was $7.0 million of total unrecognized compensation cost related to unvested service-based vesting condition awards. The unrecognized compensation cost is expected to be recognized over a weighted-average period of 3.0 years.
Stock options with market-based vesting conditions
The Company has granted awards that contain market-based vesting conditions. The following table summarizes the Company's market-based option activity for the nine months ended September 30, 2019:
(1) The aggregate intrinsic value in the above table represents the total pre-tax amount that a participant would receive if the option had been exercised on the last day of the respective fiscal period. Options with a market value less than its exercise value are not included in the intrinsic value amount.
During the second quarter of 2019, the Company granted the Executive Chairman of the Board an option to purchase 300,000 shares of Company common stock with market-based vesting conditions at an exercise price of $4.98 per share. One-third of the shares vest upon the Company's common stock closing at or above $8.00 per share for three consecutive days, one-third of the shares vest upon the Company's stock closing at or above $10.50 per share for three consecutive days, and one-third of the shares vest upon the Company's stock closing at or above $13.00 per share for three consecutive days. Each vesting tranche represents a unique requisite service period and therefore the compensation cost for each vesting tranche is recognized on a straight-line basis over its respective vesting period.
The Company recognized stock-based compensation expense of $0.1 million and $(0.2) million related to stock options with market-based based vesting conditions for the three and nine months ended September 30, 2019, respectively. The expense recognized for the nine months ended September 30, 2019 includes the reversal of expense for the former CEO's forfeited options and the expense related to the market-based options granted during the second quarter of 2019. At September 30, 2019, there was $0.9 million of total unrecognized compensation cost related to unvested market-based vesting conditions awards. This compensation cost is expected to be recognized over a weighted-average period of 2.2 years.
Stock-based compensation assumptions
The following table shows the assumptions used to compute stock-based compensation expense for stock options granted to employees and members of the board of directors under the Black-Scholes valuation model and the assumptions used to compute stock-based compensation expense for market-based stock options grants under a Monte Carlo simulation for the nine months ended September 30, 2019:
Restricted Stock Units
The Company has granted restricted stock units ("RSU") to certain employees. The Company measures the fair value of the restricted awards using the stock price on the date of the grant. The restricted shares typically vest annually over a four-year period beginning on the first anniversary of the award. The following table summarizes the Company's RSU activity for nine months ended September 30, 2019:
During the second quarter of 2019, the Company granted its newly appointed Executive Chairman of the Board 250,000 RSUs, of which 50,000 shares vested immediately on the grant date and the remainder are to vest in three equal annual increments based on continued service.
The Company recognized stock-based compensation expense of $0.1 million and $0.4 million related to RSUs for the three and nine months ended September 30, 2019, respectively. At September 30, 2019, there was $1.3 million of total unrecognized compensation cost related to the RSU grants. This compensation cost is expected to be recognized over a weighted-average period of 2.6 years.
Employee Stock Purchase Plan
On April 5, 2016, the Company’s board of directors approved the 2016 Employee Stock Purchase Plan (the “ESPP”). The ESPP was approved by the Company’s stockholders and became effective on May 18, 2016 (the “ESPP Effective Date”).
Under the ESPP, eligible employees can purchase common stock through accumulated payroll deductions at such times as are established by the administrator. The ESPP is administered by the compensation committee of the Company’s board of directors. Under the ESPP, eligible employees may purchase stock at 85% of the lower of the fair market value of a share of the Company’s common stock (i) on the first day of an offering period or (ii) on the purchase date. Eligible employees may contribute up to 15% of their earnings during the offering period. The Company’s board of directors may establish a maximum number of shares of the Company’s common stock that may be purchased by any participant, or all participants in the aggregate, during each offering or offering period. Under the ESPP, a participant may not accrue rights to purchase more than $25,000 of the fair market value of the Company’s common stock for each calendar year in which such right is outstanding.
Upon the ESPP Effective Date, the Company reserved and authorized up to 500,000 shares of common stock for issuance under the ESPP. On January 1 of each calendar year, the aggregate number of shares that may be issued under the ESPP shall automatically increase by a number equal to the lesser of (i) 1% of the total number of shares of the Company’s capital stock outstanding on December 31 of the preceding calendar year, and (ii) 500,000 shares of the Company’s common stock, or (iii) a number of shares of the Company’s common stock as determined by the Company’s board of directors or compensation committee. The number of shares increased by 408,042 on January 1, 2019. As of September 30, 2019, 1,148,085 shares remained available for issuance.
In accordance with the guidance in ASC 718-50, Employee Stock Purchase Plans, the ability to purchase shares of the Company’s common stock at the lower of the offering date price or the purchase date price represents an option and, therefore, the ESPP is a compensatory plan under this guidance. Accordingly, stock-based compensation expense is determined based on the option’s grant-date fair value and is recognized over the requisite service period of the option. The Company used the Black-Scholes valuation model and recognized stock-based compensation expense of $42,278 and $129,963 for the three and nine months ended September 30, 2019, respectively.
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