Quarterly report pursuant to Section 13 or 15(d)

Capital Structure - Narrative (Details)

Capital Structure - Narrative (Details) $ / shares in Units, $ in Millions			1 Months Ended			3 Months Ended
	Sep. 17, 2021 USD ($) shares	Jun. 04, 2021 USD ($) $ / shares shares	Aug. 31, 2021 USD ($) shares	Jul. 31, 2021 USD ($)	Jan. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2022 class_of_stock $ / shares shares	Jun. 30, 2021 $ / shares shares	Dec. 31, 2021 $ / shares shares	Mar. 31, 2021 $ / shares shares
Class of Stock [Line Items]
Number of classes of stock authorized to issue \| class_of_stock						2
Number of shares of capital stock authorized to issue (in shares)						205,000,000
Common stock, shares authorized (in shares)						200,000,000		200,000,000
Preferred stock, shares authorized (in shares)						5,000,000
Common stock, par value (in dollars per share) \| $ / shares						$ 0.001		$ 0.001
Preferred stock, par value per share (in dollars per share) \| $ / shares						$ 0.001
Exercise price per share (in dollars per share) \| $ / shares					$ 0.001				$ 0.001
Percent ownership threshold					9.99%
Proceeds from issuance of warrants \| $					$ 4.4
Preferred stock conversion ratio						0.20
Pre-funded warrants exercised (in shares)									308,880
Nantahala Capital Management LLC
Class of Stock [Line Items]
Percentage of ownership	5.00%
Warrant
Class of Stock [Line Items]
Sale of stock (in shares)					1,676,923
Horizon & Powerscourt Notes \| Notes Payable
Class of Stock [Line Items]
Proceeds from issuance of warrants \| $		$ 0.9
Horizon & Powerscourt Notes \| Notes Payable \| Warrant
Class of Stock [Line Items]
Sale of stock (in shares)		403,844					403,844
Exercise price per share (in dollars per share) \| $ / shares		$ 2.60					$ 2.60
Warrants or rights exercisable term		10 years					10 years
Nantahala
Class of Stock [Line Items]
Number of shares available under warrant (in shares)					1,676,923
Warrants outstanding (in shares)						1,368,043
Underwritten Public Offering
Class of Stock [Line Items]
Sale of stock (in shares)	14,308,878				13,971,889
Net proceeds \| $	$ 29.0				$ 37.7
Underwritten Public Offering \| Armistice
Class of Stock [Line Items]
Sale of stock (in shares)	5,454,545				2,500,000
Underwritten Public Offering \| Nantahala
Class of Stock [Line Items]
Sale of stock (in shares)					1,400,000
Purchase price (in dollars per share) \| $ / shares					$ 2.599
ATM Agreement
Class of Stock [Line Items]
Sale of stock (in shares)			2,000,000
Net proceeds \| $			$ 5.2	$ 50.0