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, 2018	687,486	$ 3,043	2,065,119	(3,357)	(1,377,319)
Beginning Balance, shares at Dec. 31, 2018		20,169,063
Net income (loss)	17,698
Ending Balances at Sep. 30, 2019	982,014	$ 382	2,350,072	(8,819)	(1,359,621)
Ending Balance, shares at Sep. 30, 2019		35,756,088
Beginning Balances at Mar. 31, 2019	949,724	$ 382	2,349,527	(8,768)	(1,391,417)
Beginning Balance, shares at Mar. 31, 2019		35,682,480
Stock-based compensation	552		552
Equity issuance costs	(925)		(925)
Issuance of common stock upon vesting of equity-based compensation awards, net of shares withheld for income tax withholdings	(26)			(26)
Issuance of common stock upon vesting of equity-based compensation awards, net of shares withheld for income tax withholdings, shares		4,727
Net income (loss)	27,512				27,512
Ending Balances at Jun. 30, 2019	976,837	$ 382	2,349,154	(8,794)	(1,363,905)
Ending Balance, shares at Jun. 30, 2019		35,687,207
Stock-based compensation	1,061		1,061
Issuance of restricted stock, shares		50,568
Issuance of common stock upon vesting of equity-based compensation awards, net of shares withheld for income tax withholdings	(168)		(143)	(25)
Issuance of common stock upon vesting of equity-based compensation awards, net of shares withheld for income tax withholdings, shares		18,313
Net income (loss)	4,284				4,284
Ending Balances at Sep. 30, 2019	982,014	$ 382	2,350,072	(8,819)	(1,359,621)
Ending Balance, shares at Sep. 30, 2019		35,756,088
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)	2,827				2,827
Ending Balances at Mar. 31, 2020	1,000,678	$ 383	2,353,169	(10,144)	(1,342,730)
Ending Balance, shares at Mar. 31, 2020		35,804,544
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
Net income (loss)	(158,227)
Ending Balances at Sep. 30, 2020	841,981	$ 386	2,355,890	(10,511)	(1,503,784)
Ending Balance, shares at Sep. 30, 2020		36,034,837
Beginning Balances at Mar. 31, 2020	1,000,678	$ 383	2,353,169	(10,144)	(1,342,730)
Beginning Balance, shares at Mar. 31, 2020		35,804,544
Stock-based compensation	1,764		1,764
Issuance of common stock upon vesting of equity-based compensation awards, net of shares withheld for income tax withholdings	(368)	$ 3	(4)	(367)
Issuance of common stock upon vesting of equity-based compensation awards, net of shares withheld for income tax withholdings, shares		230,293
Net income (loss)	(68,854)				(68,854)
Ending Balances at Jun. 30, 2020	933,220	$ 386	2,354,929	(10,511)	(1,411,584)
Ending Balance, shares at Jun. 30, 2020		36,034,837
Stock-based compensation	961		961
Net income (loss)	(92,200)				(92,200)
Ending Balances at Sep. 30, 2020	$ 841,981	$ 386	$ 2,355,890	$ (10,511)	$ (1,503,784)
Ending Balance, shares at Sep. 30, 2020		36,034,837