CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Deficit [Member]
Increase (Decrease) in Stockholders' Equity
Adjustment/Adoption | Accounting Standards Update 2014-09 [Member]			$ 120	$ (120)
Balance (in shares) at Dec. 31, 2016		75,839,998
Balance at Dec. 31, 2016	$ 362,565	$ 76	583,653	(221,164)
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)	(22,567)			(22,567)
Issuance of common stock (shares)		50,612,027
Issuance of common stock	59,130	$ 51	59,079
Stock-based compensation	3,622		3,622
Vesting of restricted common stock, net of restricted common stock used to fund employee income tax withholding due upon vesting (shares)		1,077,292
Vesting of restricted common stock, net of restricted common stock used to fund employee income tax withholding due upon vesting		$ 1
Vesting of restricted common stock, net of restricted common stock used to fund employee income tax withholding due upon vesting	(781)		(782)
Exercise of stock options (in shares)		117,213
Exercise of stock option	121		121
Balance (in shares) at Dec. 31, 2017		127,646,530
Balance at Dec. 31, 2017	402,090	$ 128	645,813	(243,851)
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)	11,783			11,783
Stock-based compensation	4,179		4,179
Vesting of restricted common stock, net of restricted common stock used to fund employee income tax withholding due upon vesting (shares)		975,061
Vesting of restricted common stock, net of restricted common stock used to fund employee income tax withholding due upon vesting		$ 1
Vesting of restricted common stock, net of restricted common stock used to fund employee income tax withholding due upon vesting	(903)		(904)
Exercise of stock options (in shares)		95,004
Exercise of stock option	114		114
Balance at Dec. 31, 2018	417,263	$ 129	649,202	(232,068)
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)	13,631			13,631
Stock-based compensation	4,281		4,281
Vesting of restricted common stock, net of restricted common stock used to fund employee income tax withholding due upon vesting (shares)		816,177
Vesting of restricted common stock, net of restricted common stock used to fund employee income tax withholding due upon vesting		$ 1
Vesting of restricted common stock, net of restricted common stock used to fund employee income tax withholding due upon vesting	(540)		(541)
Exercise of stock options (in shares)		20,745
Exercise of stock option	21		21
Balance (in shares) at Dec. 31, 2019		129,553,517
Balance at Dec. 31, 2019	$ 434,656	$ 130	$ 652,963	$ (218,437)