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, 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	0	22,631
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)
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	14	0	0	14
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
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)
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			11
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 Dec. 31, 2020	0	25,110
Balance at Dec. 31, 2020	$ 0	$ 25	354,685	11,690	(88,509)	277,891
Public offering of common stock, net (in shares)	0	1,553
Public offering of common stock, net	$ 0	$ 2	15,229		0	15,231
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	510
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(637)	0	0	(637)
Share-based compensation	0	0	8,922	0	0	8,922
Foreign currency translation adjustment	0	0	0	2,175	0	2,175
Net loss	$ 0	$ 0	0	0	(39,622)	$ (39,622)
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	8	0	0	$ 8
Balance (in shares) at Sep. 30, 2021	0	27,175
Balance at Sep. 30, 2021	$ 0	$ 27	378,207	13,865	(128,131)	263,968
Balance (in shares) at Jun. 30, 2021	0	26,919
Balance at Jun. 30, 2021	$ 0	$ 27	375,312	14,286	(112,334)	277,291
Public offering of common stock, net (in shares)	0	7
Public offering of common stock, net	$ 0	$ 0	1	0	0	1
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	249
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(236)	0	0	(236)
Share-based compensation	0	0	3,130	0	0	3,130
Foreign currency translation adjustment	0	0	0	(421)	0	(421)
Net loss	$ 0	$ 0	0	0	(15,797)	(15,797)
Balance (in shares) at Sep. 30, 2021	0	27,175
Balance at Sep. 30, 2021	$ 0	$ 27	$ 378,207	$ 13,865	$ (128,131)	$ 263,968