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	1,582
Public offering of common stock, net	$ 0	$ 2	13,928	0	0	13,930
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	218
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(467)	0	0	(467)
Share-based compensation	0	0	6,540	0	0	6,540
Foreign currency translation adjustment	0	0	0	(948)	0	(948)
Net loss	$ 0	$ 0	0	0	(35,397)	(35,397)
Stock options exercised, net of shares withheld for employee tax (in shares)	0	0
Stock options exercised, net of shares withheld for employee tax	$ 0	$ 0	3	0	0	3
Balance (in shares) at Jun. 30, 2020	0	21,940
Balance at Jun. 30, 2020	$ 0	$ 22	323,405	(518)	(65,454)	257,455
Balance (in shares) at Mar. 31, 2020	0	20,249
Balance at Mar. 31, 2020	$ 0	$ 20	306,305	(1,972)	(46,854)	257,499
Public offering of common stock, net (in shares)	0	1,578
Public offering of common stock, net	$ 0	$ 2	14,002	0	0	14,004
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	113
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(207)	0	0	(207)
Share-based compensation	0	0	3,302	0	0	3,302
Foreign currency translation adjustment	0	0	0	1,454	0	1,454
Net loss	$ 0	$ 0	0	0	(18,600)	(18,600)
Stock options exercised, net of shares withheld for employee tax (in shares)	0	0
Stock options exercised, net of shares withheld for employee tax	$ 0	$ 0	3			3
Balance (in shares) at Jun. 30, 2020	0	21,940
Balance at Jun. 30, 2020	$ 0	$ 22	323,405	(518)	(65,454)	257,455
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	1,546
Public offering of common stock, net	$ 0	$ 2	15,228		0	15,230
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	261
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(402)	0	0	(402)
Share-based compensation	0	0	5,793	0	0	5,793
Foreign currency translation adjustment	0	0	0	2,596	0	2,596
Net loss	$ 0	$ 0	0	0	(23,825)	$ (23,825)
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 Jun. 30, 2021	0	26,919
Balance at Jun. 30, 2021	$ 0	$ 27	375,312	14,286	(112,334)	277,291
Balance (in shares) at Mar. 31, 2021	0	26,787
Balance at Mar. 31, 2021	$ 0	$ 27	371,920	10,656	(104,131)	278,472
Public offering of common stock, net (in shares)	0	35
Public offering of common stock, net	$ 0	$ 0	262	0	0	262
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	97
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(144)	0	0	(144)
Share-based compensation	0	0	3,274	0	0	3,274
Foreign currency translation adjustment	0	0	0	3,630	0	3,630
Net loss	$ 0	$ 0	0	0	(8,203)	(8,203)
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