Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	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, 2016	0	18,400
Balance at Dec. 31, 2016	$ 0	$ 18	$ 265,264	$ (885)	$ (37,013)	$ 227,384
Public offering of common stock, net (in shares)	0	459
Public offering of common stock, net	$ 0	$ 1	21,571	0	0	21,572
Stock options exercised, net of shares withheld for employee tax (in shares)	0	418
Stock options exercised, net of shares withheld for employee tax	$ 0	$ 0	(6,623)	0	0	(6,623)
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	174
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(2,631)	0	0	(2,631)
Share-based compensation	0	0	7,795	0	0	7,795
Cumulative effect of previously unrecognized tax benefits	0	0	0	0	1,200	1,200
Net income (loss)	0	0	0	0	73,951	73,951
Foreign currency translation adjustment	$ 0	$ 0		10,628	0	10,628
Balance (in shares) at Dec. 31, 2017	0	19,451
Balance at Dec. 31, 2017	$ 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
Cumulative effect of previously unrecognized tax benefits	0	$ 0	0	(9,141)	0	(9,141)
Net income (loss)	$ 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				4
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 income (loss)	0	0	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