Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 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, 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	1
Stock options exercised, net of shares withheld for employee tax	$ 0	$ 0	8	0	0	8
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	250
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(702)	0	0	(702)
Share-based compensation	0	0	8,939	0	0	8,939
Foreign currency translation adjustment	0	0	0	(4,434)	0	(4,434)
Net loss	$ 0	$ 0	0	0	(30,620)	(30,620)
Balance (in shares) at Sep. 30, 2019	0	20,061
Balance at Sep. 30, 2019	$ 0	$ 20	300,725	(3,832)	5,372	302,285
Balance (in shares) at Jun. 30, 2019	0	19,951
Balance at Jun. 30, 2019	$ 0	$ 20	297,922	(379)	14,152	311,715
Stock options exercised, net of shares withheld for employee tax (in shares)	0	1
Stock options exercised, net of shares withheld for employee tax	$ 0	$ 0	1	0	0	1
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	109
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(176)	0	0	(176)
Share-based compensation	0	0	2,978	0	0	2,978
Foreign currency translation adjustment	0	0	0	(3,453)	0	(3,453)
Net loss	$ 0	$ 0	0	0	(8,780)	(8,780)
Balance (in shares) at Sep. 30, 2019	0	20,061
Balance at Sep. 30, 2019	$ 0	$ 20	300,725	(3,832)	5,372	302,285
Balance (in shares) at Dec. 31, 2019	0	20,140
Balance at Dec. 31, 2019	$ 0	$ 20	303,401	430	(30,057)	273,794
Public offering of common stock, net (in shares)	0	2,362
Public offering of common stock, net	$ 0	$ 2	22,629		0	$ 22,631
Stock options exercised, net of shares withheld for employee tax (in shares)	0	2				2
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	383
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 1	(813)	0	0	(812)
Share-based compensation	0	0	9,804	0	0	9,804
Foreign currency translation adjustment	0	0	0	4,748	0	4,748
Net loss	$ 0	$ 0	0	0	(45,013)	(45,013)
Other (in shares)	0	0
Other	$ 0	$ 0	0	0	0	0
Balance (in shares) at Sep. 30, 2020	0	22,887
Balance at Sep. 30, 2020	$ 0	$ 23	335,035	5,178	(75,070)	265,166
Balance (in shares) at Jun. 30, 2020	0	21,940
Balance at Jun. 30, 2020	$ 0	$ 22	323,405	(518)	(65,454)	257,455
Public offering of common stock, net (in shares)	0	780
Public offering of common stock, net	$ 0	$ 1	8,702	0	0	8,703
Stock options exercised, net of shares withheld for employee tax (in shares)	0	2
Stock options exercised, net of shares withheld for employee tax	$ 0	$ 0	11	0	0	11
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	165
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(348)	0	0	(348)
Share-based compensation	0	0	3,265	0	0	3,265
Foreign currency translation adjustment	0	0	0	5,696	0	5,696
Net loss	$ 0	$ 0	0	0	(9,616)	(9,616)
Balance (in shares) at Sep. 30, 2020	0	22,887
Balance at Sep. 30, 2020	$ 0	$ 23	$ 335,035	$ 5,178	$ (75,070)	$ 265,166