Consolidated Statements of Stockholders’ Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock
Beginning balance (shares) at Dec. 31, 2018		3,853,909
Beginning balance at Dec. 31, 2018	$ 391,533	$ 39	$ 504,178	$ (109,638)	$ (3,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issuance costs	(177)		(177)
Stock-based compensation	387		387
Net loss	(2,373)			(2,373)
Ending balance (shares) at Mar. 31, 2019		3,853,909
Ending balance at Mar. 31, 2019	389,370	$ 39	504,388	(112,011)	(3,046)
Beginning balance (shares) at Dec. 31, 2018		3,853,909
Beginning balance at Dec. 31, 2018	391,533	$ 39	504,178	(109,638)	(3,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(25,778)
Ending balance (shares) at Sep. 30, 2019		3,833,087
Ending balance at Sep. 30, 2019	366,635	$ 39	505,384	(135,416)	(3,372)
Beginning balance (shares) at Mar. 31, 2019		3,853,909
Beginning balance at Mar. 31, 2019	389,370	$ 39	504,388	(112,011)	(3,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock forfeiture (in shares)		(6,478)
Stock-based compensation	416		416
Net loss	(12,858)			(12,858)
Ending balance (shares) at Jun. 30, 2019		3,847,431
Ending balance at Jun. 30, 2019	376,928	$ 39	504,804	(124,869)	(3,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury stock (shares)		(14,344)
Purchase of treasury stock	(328)		(2)		(326)
Stock-based compensation	582		582
Net loss	(10,547)			(10,547)
Ending balance (shares) at Sep. 30, 2019		3,833,087
Ending balance at Sep. 30, 2019	366,635	$ 39	505,384	(135,416)	(3,372)
Beginning balance (shares) at Dec. 31, 2019		3,812,050
Beginning balance at Dec. 31, 2019	331,596	$ 38	505,831	(170,426)	(3,847)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
RSUs vested, net of shares withheld for taxes (shares)		11,941
RSUs vested, net of shares withheld for taxes	(26)		(26)
Purchase of treasury stock (shares)		(14,443)
Purchase of treasury stock	(66)				(66)
Stock-based compensation	570		570
Net loss	(28,223)			(28,223)
Ending balance (shares) at Mar. 31, 2020		3,809,548
Ending balance at Mar. 31, 2020	303,851	$ 38	506,375	(198,649)	(3,913)
Beginning balance (shares) at Dec. 31, 2019		3,812,050
Beginning balance at Dec. 31, 2019	331,596	$ 38	505,831	(170,426)	(3,847)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(53,542)
Ending balance (shares) at Sep. 30, 2020		6,166,720
Ending balance at Sep. 30, 2020	289,721	$ 62	517,540	(223,968)	(3,913)
Beginning balance (shares) at Mar. 31, 2020		3,809,548
Beginning balance at Mar. 31, 2020	303,851	$ 38	506,375	(198,649)	(3,913)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock forfeiture (in shares)		(5,716)
RSUs vested, net of shares withheld for taxes (shares)		6,711
RSUs vested, net of shares withheld for taxes	(52)		(52)
Issuance of common stock (shares)		1,192,566
Issuance of common stock, net of offering costs	6,801	$ 12	6,789
Stock-based compensation	290		290
Net loss	(10,120)			(10,120)
Ending balance (shares) at Jun. 30, 2020		5,003,109
Ending balance at Jun. 30, 2020	300,770	$ 50	513,402	(208,769)	(3,913)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (shares)		1,163,611
Issuance of common stock, net of offering costs	3,456	$ 12	3,444
Stock-based compensation	694		694
Net loss	(15,199)			(15,199)
Ending balance (shares) at Sep. 30, 2020		6,166,720
Ending balance at Sep. 30, 2020	$ 289,721	$ 62	$ 517,540	$ (223,968)	$ (3,913)