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 or performance stock units, net of employee's withholding liability (in shares)	[1]				109,000
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability		(271)					(271)
Reacquisition of equity component of 2021 Notes and 2024 Notes		(16,814)					(16,814)
Stock-based compensation		1,934					1,934
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)		(3,791)
Balances (in shares) at Sep. 30, 2020	[1]		26,795,000
Balances at Sep. 30, 2020		75,950	$ 3	[1]			479,539		(403,592)
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 or performance stock units, net of employee's withholding liability (in shares)	[1]		54,000
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability		(41)					(41)
Issuance of common stock in connection 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
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)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in conjunction with vesting of restricted stock units or performance stock units, net of employee's withholding liability (in shares)	[1]		21,000
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability		(17)					(17)
Stock-based compensation		1,511					1,511
Net income (loss)		(10,522)							(10,522)
Balances (in shares) at Sep. 30, 2020	[1]		26,795,000
Balances at Sep. 30, 2020		$ 75,950	$ 3	[1]			479,539		(403,592)
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 upon exercise of 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 or performance stock units, net of employee's withholding liability (in shares)	[1]				211,000	13,000
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability		(388)					(388)
Issuance of common stock upon exercise of warrant (in shares)	[1]		347,000
Stock-based compensation		772					772
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)		$ (5,887)
Balances (in shares) at Sep. 30, 2021		44,622,498	44,622,000	[1]
Balances at Sep. 30, 2021		$ 96,860	$ 4	[1]			530,689		(433,833)
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 or performance stock units, net of employee's withholding liability (in shares)	[1]		227,000
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability		(19)					(19)
Issuance of common stock upon exercise of warrant (in shares)	[1]		845,000
Issuance of common stock upon exercise of options		193					193
Stock split fractional shares settlement (in shares)	[1]		(18,000)
Stock-based compensation		957					957
Net income (loss)		(14,169)							(14,169)
Balances (in shares) at Jun. 30, 2021	[1]		44,494,000
Balances at Jun. 30, 2021		92,265	$ 4	[1]			529,831		(437,570)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in conjunction with vesting of restricted stock units or performance stock units, net of employee's withholding liability (in shares)	[1]		128,000
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability		(8)					(8)
Stock-based compensation		866					866
Net income (loss)		$ 3,737							3,737
Balances (in shares) at Sep. 30, 2021		44,622,498	44,622,000	[1]
Balances at Sep. 30, 2021		$ 96,860	$ 4	[1]			$ 530,689		$ (433,833)

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