CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands		Total	Common Stock		Common Stock Restricted stock units	Common Stock Performance stock units	Additional Paid-in Capital	[1]	Accumulated Earnings (Deficit)
Balances (in shares) at Dec. 31, 2019	[1]		20,222,000
Balances at Dec. 31, 2019		$ 57,958	$ 2	[1]			$ 457,757		$ (399,801)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in conjunction with vesting of restricted stock units (in shares)	[1]				109,000
Reacquisition of equity component of 2021 Notes and 2024 Notes		(16,814)					(16,814)
Stock-based compensation		1,934					1,934
Shares withheld for payment of employee's withholding tax liability		(271)					(271)
Net income (loss)		41,230							41,230
Balances (in shares) at Mar. 31, 2020	[1]		20,331,000
Balances at Mar. 31, 2020		84,037	$ 2	[1]			442,606		(358,571)
Balances (in shares) at Dec. 31, 2019	[1]		20,222,000
Balances at Dec. 31, 2019		57,958	$ 2	[1]			457,757		(399,801)
Increase (Decrease) in Stockholders' Equity
Net income (loss)		6,731
Balances (in shares) at Jun. 30, 2020	[1]		26,774,000
Balances at Jun. 30, 2020		84,978	$ 3	[1]			478,045		(393,070)
Balances (in shares) at Mar. 31, 2020	[1]		20,331,000
Balances at Mar. 31, 2020		84,037	$ 2	[1]			442,606		(358,571)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock purchase plan (in shares)	[1]		19,000
Issuance of common stock under employee stock purchase plan		49					49
Issuance of common stock in conjunction with vesting of restricted stock units (in shares)	[1]		54,000
Issuance of common stock in conjunction with the Zyla Merger (in shares)	[1]		6,370,000
Issuance of common stock in connection with the Zyla Merger		22,931	$ 1	[1]			22,930
Issuance of warrants and stock options in conjunction with the Zyla Merger		11,626					11,626
Reacquisition of equity component of 2021 Notes and 2024 Notes		(2,718)					(2,718)
Stock-based compensation		3,593					3,593
Shares withheld for payment of employee's withholding tax liability		(41)					(41)
Net income (loss)		(34,499)							(34,499)
Balances (in shares) at Jun. 30, 2020	[1]		26,774,000
Balances at Jun. 30, 2020		$ 84,978	$ 3	[1]			478,045		(393,070)
Balances (in shares) at Dec. 31, 2020		28,392,149	28,392,000	[1]
Balances at Dec. 31, 2020		$ 55,514	$ 3	[1]			483,456		(427,945)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in conjunction with vesting of stock options (in shares)	[1]		73,000
Issuance of common stock in connection with stock offerings (in shares)	[1]		14,400,000
Issuance of common stock in connection with stock offerings		44,861	$ 1	[1]			44,860
Issuance of common stock in conjunction with vesting of restricted stock units (in shares)	[1]				211,000	13,000
Issuance of common stock upon exercise of warrant (in shares)	[1]		347,000
Stock-based compensation		772					772
Shares withheld for payment of employee's withholding tax liability		(388)					(388)
Net income (loss)		4,544							4,544
Balances (in shares) at Mar. 31, 2021	[1]		43,436,000
Balances at Mar. 31, 2021		$ 105,303	$ 4	[1]			528,700		(423,401)
Balances (in shares) at Dec. 31, 2020		28,392,149	28,392,000	[1]
Balances at Dec. 31, 2020		$ 55,514	$ 3	[1]			483,456		(427,945)
Increase (Decrease) in Stockholders' Equity
Net income (loss)		$ (9,625)
Balances (in shares) at Jun. 30, 2021		44,494,051	44,494,000	[1]
Balances at Jun. 30, 2021		$ 92,265	$ 4	[1]			529,831		(437,570)
Balances (in shares) at Mar. 31, 2021	[1]		43,436,000
Balances at Mar. 31, 2021		105,303	$ 4	[1]			528,700		(423,401)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock purchase plan (in shares)	[1]		4,000
Issuance of common stock in conjunction with vesting of restricted stock units (in shares)	[1]		227,000
Issuance of common stock upon exercise of warrant (in shares)	[1]		845,000
Issuance of common stock upon exercise of options		193					193
Reverse stock split (in shares)	[1]		(18,000)
Stock-based compensation		957					957
Shares withheld for payment of employee's withholding tax liability		(19)					(19)
Net income (loss)		$ (14,169)							(14,169)
Balances (in shares) at Jun. 30, 2021		44,494,051	44,494,000	[1]
Balances at Jun. 30, 2021		$ 92,265	$ 4	[1]			$ 529,831		$ (437,570)

[1] Adjusted to reflect the 1-for-4 reverse stock split effected on May 18, 2021.