Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]
Beginning Balances at Dec. 31, 2018	$ 687,486	$ 3,043	$ 2,065,119	$ (3,357)	$ (1,377,319)
Beginning Balance, shares at Dec. 31, 2018		20,169,063
Stock-based compensation	6,001		6,001
Equity issuance costs	(30)		(30)
Shares of common stock issued in merger, net of equity issuance costs	275,759	$ 150	275,609
Shares of common stock issued in merger, net of equity issuance costs, shares		15,013,520
Reverse split		$ (2,833)	2,833
Issuance of common stock upon vesting of equity-based compensation awards, net of shares withheld for income tax withholdings	(5,394)	$ 22	(5)	(5,411)
Issuance of common stock upon vesting of equity-based compensation awards, net of shares withheld for income tax withholdings, shares		499,897
Net income (loss)	(14,098)				(14,098)
Ending Balances at Mar. 31, 2019	949,724	$ 382	2,349,527	(8,768)	(1,391,417)
Ending Balance, shares at Mar. 31, 2019		35,682,480
Beginning Balances at Dec. 31, 2019	997,086	$ 383	2,352,309	(10,049)	(1,345,557)
Beginning Balance, shares at Dec. 31, 2019		35,770,934
Stock-based compensation	860		860
Issuance of common stock upon vesting of equity-based compensation awards, net of shares withheld for income tax withholdings	(95)			(95)
Issuance of common stock upon vesting of equity-based compensation awards, net of shares withheld for income tax withholdings, shares		33,610
Net income (loss)	2,828				2,828
Ending Balances at Mar. 31, 2020	$ 1,000,679	$ 383	$ 2,353,169	$ (10,144)	$ (1,342,729)
Ending Balance, shares at Mar. 31, 2020		35,804,544