Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Narrative (Details)

Fair Value Measurements - Narrative (Details)		3 Months Ended			12 Months Ended
Fair Value Measurements - Narrative (Details)	Feb. 16, 2018 USD ($)	Mar. 31, 2019 USD ($) $ / shares	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) class_of_stock	Dec. 31, 2018 USD ($)	Nov. 17, 2017 USD ($)	Dec. 31, 2015 shares	Oct. 31, 2015 shares	Dec. 31, 2014 shares
Level 3 Valuation
Number of changes in valuation techniques \| class_of_stock				0
Amount of transfers of assets from level 2 to level 1				$ 0
Amount of transfers of assets from level 1 to level 2		$ 0		0
Level 2
Level 3 Valuation
Long-term debt fair value		$ 14,900,000
Level 3
Level 3 Valuation
Issuance of contingent consideration and royalty				8,115,909
Warrant liability \| Level 3
Level 3 Valuation
Expected life		1 year 7 months 6 days
Equity Unit Purchase Option \| Level 3
Level 3 Valuation
Expected life		1 year 7 months 6 days
Royalty Payable \| Level 3
Level 3 Valuation
Issuance of contingent consideration and royalty			$ 0	$ 240,744
Measurement Input, Price Volatility \| Warrant liability \| Level 3
Level 3 Valuation
Warrants and rights outstanding, measurement input		0.50
Measurement Input, Price Volatility \| Equity Unit Purchase Option \| Level 3
Level 3 Valuation
Warrants and rights outstanding, measurement input		0.50
Measurement Input, Share Price \| Warrant liability \| Level 3
Level 3 Valuation
Warrants and rights outstanding, measurement input \| $ / shares		5.84
Measurement Input, Share Price \| Equity Unit Purchase Option \| Level 3
Level 3 Valuation
Warrants and rights outstanding, measurement input \| $ / shares		5.84
Measurement Input, Risk Free Interest Rate \| Warrant liability \| Level 3
Level 3 Valuation
Warrants and rights outstanding, measurement input		0.0233
Measurement Input, Risk Free Interest Rate \| Equity Unit Purchase Option \| Level 3
Level 3 Valuation
Warrants and rights outstanding, measurement input		0.0233
Measurement Input, Exercise Price \| Warrant liability \| Level 3
Level 3 Valuation
Warrants and rights outstanding, measurement input \| $ / shares		8.40
Measurement Input, Exercise Price \| Equity Unit Purchase Option \| Level 3
Level 3 Valuation
Warrants and rights outstanding, measurement input \| $ / shares		7.47
Preferred Stock \| Series B Preferred Stock
Level 3 Valuation
Number of shares available under warrant (in shares) \| shares									625,208
Common stock
Level 3 Valuation
Number of shares available under warrant (in shares) \| shares								22,328
Avadel
Level 3 Valuation
Product royalty net	15.00%
Royalty obligation (up to)	$ 12,500,000
Fair value of royalty obligation		$ 7,700,000
Contingent consideration	$ 7,900,000
Avadel \| Measurement Input, Discount Rate
Level 3 Valuation
Royalty obligation measurement input		0.084
Avadel \| Measurement Input, Risk Free Interest Rate
Level 3 Valuation
Royalty obligation measurement input		0.023
Avadel \| Measurement Input, Counterparty Credit Risk
Level 3 Valuation
Royalty obligation measurement input		0.061
TRx
Level 3 Valuation
Contingent consideration						$ 1,366,633
Milestone One \| TRx
Level 3 Valuation
Contingent consideration					$ 0	3,000,000
Business combination gross profit					$ 12,600,000
Milestone Two \| TRx
Level 3 Valuation
Contingent consideration		$ 900,000				2,000,000
Expected time to milestone		2 months 12 days
Milestone Two \| TRx \| Measurement Input, Discount Rate
Level 3 Valuation
Contingent consideration liability measurement input		0.085
Milestone Two \| TRx \| Measurement Input, Risk Free Interest Rate
Level 3 Valuation
Contingent consideration liability measurement input		0.024
Milestone Two \| TRx \| Measurement Input, Counterparty Credit Risk
Level 3 Valuation
Contingent consideration liability measurement input		0.061
Milestone Two \| TRx \| Measurement Input, Probability Of Milestone Success
Level 3 Valuation
Contingent consideration liability measurement input		0.450
Milestone Three \| TRx
Level 3 Valuation
Contingent consideration		$ 400,000				$ 2,000,000
Expected time to milestone		1 year 3 months 18 days
Milestone Three \| TRx \| Measurement Input, Discount Rate
Level 3 Valuation
Contingent consideration liability measurement input		0.084
Milestone Three \| TRx \| Measurement Input, Risk Free Interest Rate
Level 3 Valuation
Contingent consideration liability measurement input		0.023
Milestone Three \| TRx \| Measurement Input, Counterparty Credit Risk
Level 3 Valuation
Contingent consideration liability measurement input		0.061
Milestone Three \| TRx \| Measurement Input, Probability Of Milestone Success
Level 3 Valuation
Contingent consideration liability measurement input		0.225
Common Stock Warrants
Level 3 Valuation
Number of shares available under warrant (in shares) \| shares							40,000