Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Preferred Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2017							0	19,451
Balance at Dec. 31, 2017	$ 0		$ 0	$ (9,141)	$ 0	$ (9,141)	$ 0	$ 19	$ 285,376	$ 9,743	$ 38,138	$ 333,276
Stock options exercised, net of shares withheld for employee tax (in shares)							0	121
Stock options exercised, net of shares withheld for employee tax							$ 0	$ 0	(2,073)	0	0	(2,073)
Issuance of restricted stock, net of shares withheld for employee tax (in shares)							0	238
Issuance of restricted stock, net of shares withheld for employee tax							$ 0	$ 1	(1,943)	0	0	(1,942)
Share-based compensation							0	0	11,120	0	0	11,120
Net loss							$ 0	$ 0		0	(2,146)	(2,146)
Balance (in shares) at Dec. 31, 2018							0	19,810
Balance at Dec. 31, 2018							$ 0	$ 20	292,480	602	35,992	329,094
Stock options exercised, net of shares withheld for employee tax (in shares)							0	3
Stock options exercised, net of shares withheld for employee tax							$ 0	$ 0	14	0	0	14
Issuance of restricted stock, net of shares withheld for employee tax (in shares)							0	327
Issuance of restricted stock, net of shares withheld for employee tax							$ 0	$ 0	(897)	0	0	(897)
Share-based compensation							0	0	11,804	0	0	11,804
Net loss							0		0		(66,049)	(66,049)
Foreign currency translation adjustment							$ 0	$ 0	0	(172)	0	(172)
Balance (in shares) at Dec. 31, 2019							0	20,140
Balance at Dec. 31, 2019							$ 0	$ 20	303,401	430	(30,057)	$ 273,794
Stock options exercised, net of shares withheld for employee tax (in shares)							0	3				5
Stock options exercised, net of shares withheld for employee tax							$ 0	$ 0	30	0	0	$ 30
Issuance of restricted stock, net of shares withheld for employee tax (in shares)							0	497
Issuance of restricted stock, net of shares withheld for employee tax							$ 0	$ 1	(1,098)	0	0	(1,097)
Share-based compensation							0	0	13,046	0	0	13,046
Net loss							0	0	0	0	(58,452)	(58,452)
Foreign currency translation adjustment							$ 0	$ 0	0	11,260	0	11,260
Public offering of common stock, net (in shares)							0	4,470
Public offering of common stock, net							$ 0	$ 4	39,306	0	0	39,310
Balance (in shares) at Dec. 31, 2020							0	25,110
Balance at Dec. 31, 2020							$ 0	$ 25	$ 354,685	$ 11,690	$ (88,509)	$ 277,891