CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Rpi Finance Trust	Common Stock	Common Stock Rpi Finance Trust	Capital Contributed in Excess of Par	Capital Contributed in Excess of Par Rpi Finance Trust	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest	Convertible Preferred Stock
Beginning balance (in shares) at Dec. 31, 2017			161,303,000								0
Beginning Balance at Dec. 31, 2017	$ 16,450		$ 1,613		$ 659,467		$ (458)	$ (642,973)	$ (401)	$ (798)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of warrant liability to equity, net	17,757				17,757
Exercise of stock options (in shares)			83,000
Exercise of stock options, net	333		$ 1		332
Exercise of common stock warrants (in shares)			1,400,000
Exercise of common stock warrants	5,250		$ 14		5,236
Issuance of common stock (in shares)				4,373,000
Issuance of common stock		$ 67,784		$ 44		$ 67,740
Stock-based compensation (in shares)			284,000
Stock-based compensation	1,332		$ 2		1,330
Conversion of RSU's for tax withholding payments (in shares)			(187,000)
Conversion of RSU's for tax withholding payments	(1,472)		$ (2)		(1,470)
Other comprehensive loss	(56)								(56)
Net loss	(35,558)							(35,546)		(12)
Ending balance (in shares) at Mar. 31, 2018			167,256,000								0
Ending Balance at Mar. 31, 2018	71,820		$ 1,672		750,392		(458)	(678,519)	(457)	(810)	$ 0
Beginning balance (in shares) at Dec. 31, 2018			190,446,000								0
Beginning Balance at Dec. 31, 2018	265,849		$ 1,905		1,219,237		(824)	(953,216)	(351)	(902)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)			1,063,000
Exercise of stock options, net	1,825		$ 10		3,086		(1,271)
Stock-based compensation	1,743				1,743
Other comprehensive loss	(209)								(209)
Net loss	(87,404)							(87,337)		(67)
Ending balance (in shares) at Mar. 31, 2019			191,509,000								0
Ending Balance at Mar. 31, 2019	$ 181,804		$ 1,915		$ 1,224,066		$ (2,095)	$ (1,040,553)	$ (560)	$ (969)	$ 0