CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Warrants and Options	Convertible debt	Common Stock	Additional Paid-In Capital	Additional Paid-In Capital Warrants and Options	Additional Paid-In Capital Convertible debt	Accumulated Earnings (Deficit)	Accumulated Other Comprehensive Loss
Balances (in shares) at Dec. 31, 2018				64,185
Balances at Dec. 31, 2018	$ 220,335			$ 6	$ 402,934			$ (182,600)	$ (5)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of options (in shares)				14
Issuance of common stock upon exercise of options	25				25
Issuance of common stock in conjunction with vesting of restricted stock units (in shares)				132
Stock-based compensation	2,702				2,702
Shares withheld for payment of employee's withholding tax liability	(216)				(216)
Net income (loss)	(14,301)							(14,301)
Balances (in shares) at Mar. 31, 2019				64,331
Balances at Mar. 31, 2019	208,545			$ 6	405,445			(196,901)	(5)
Balances (in shares) at Dec. 31, 2018				64,185
Balances at Dec. 31, 2018	220,335			$ 6	402,934			(182,600)	(5)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(27,906)
Comprehensive loss	(27,906)
Balances (in shares) at Jun. 30, 2019				64,821
Balances at Jun. 30, 2019	197,439			$ 6	407,944			(210,506)	(5)
Balances (in shares) at Mar. 31, 2019				64,331
Balances at Mar. 31, 2019	208,545			$ 6	405,445			(196,901)	(5)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock purchase plan (in shares)				64
Issuance of common stock under employee stock purchase plan	158				158
Issuance of common stock in conjunction with vesting of restricted stock units (in shares)				426
Stock-based compensation	2,634				2,634
Shares withheld for payment of employee's withholding tax liability	(293)				(293)
Net income (loss)	(13,605)							(13,605)
Comprehensive loss	(13,605)
Balances (in shares) at Jun. 30, 2019				64,821
Balances at Jun. 30, 2019	197,439			$ 6	407,944			(210,506)	(5)
Balances (in shares) at Dec. 31, 2019				80,888
Balances at Dec. 31, 2019	57,958			$ 8	457,751			(399,801)	0
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in conjunction with vesting of restricted stock units (in shares)				434
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				81,322
Balances at Mar. 31, 2020	84,037			$ 8	442,600			(358,571)	0
Balances (in shares) at Dec. 31, 2019				80,888
Balances at Dec. 31, 2019	57,958			$ 8	457,751			(399,801)	0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	6,731
Comprehensive loss	6,731
Balances (in shares) at Jun. 30, 2020				107,092
Balances at Jun. 30, 2020	84,978			$ 11	478,037			(393,070)	0
Balances (in shares) at Mar. 31, 2020				81,322
Balances at Mar. 31, 2020	84,037			$ 8	442,600			(358,571)	0
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock purchase plan (in shares)				76
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)				215
Issuance of common stock in conjunction with vesting of restricted stock units	0				0
Issuance of common stock in conjunction with the Zyla Merger (in shares)				25,479
Issuance common stock, warrants, and stock options in conjunction with the Zyla Merger	22,931	$ 11,626		$ 3	22,928	$ 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)
Comprehensive loss	(34,499)							(34,499)
Balances (in shares) at Jun. 30, 2020				107,092
Balances at Jun. 30, 2020	$ 84,978			$ 11	$ 478,037			$ (393,070)	$ 0