Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Balance (in shares) at Dec. 31, 2018		27,391,290
Beginning Balance at Dec. 31, 2018	$ 22,898	$ 27	$ 115,450	$ (92,564)	$ (15)
Increase (Decrease) in Stockholders' Equity
Vesting of restricted stock units (in shares)		116,997
Stock-based compensation	1,040		1,040
Exercise of warrants (in shares)		140,000
Exercise of warrants	400		400
Net loss	(7,137)			(7,137)
Foreign currency translation adjustment, net of tax	(10)				(10)
Balance (in shares) at Mar. 31, 2019		27,648,287
Ending Balance at Mar. 31, 2019	17,191	$ 27	116,890	(99,701)	(25)
Balance (in shares) at Dec. 31, 2018		27,391,290
Beginning Balance at Dec. 31, 2018	22,898	$ 27	115,450	(92,564)	(15)
Increase (Decrease) in Stockholders' Equity
Net loss	(14,635)
Foreign currency translation adjustment, net of tax	6
Balance (in shares) at Jun. 30, 2019		28,329,870
Ending Balance at Jun. 30, 2019	12,156	$ 28	119,336	(107,199)	(9)
Balance (in shares) at Mar. 31, 2019		27,648,287
Beginning Balance at Mar. 31, 2019	17,191	$ 27	116,890	(99,701)	(25)
Increase (Decrease) in Stockholders' Equity
Vesting of restricted stock units (in shares)		334,774
Stock-based compensation	1,460		1,460
Exercise of warrants (in shares)		346,809
Exercise of warrants	987	$ 1	986
Net loss	(7,498)			(7,498)
Foreign currency translation adjustment, net of tax	16				16
Balance (in shares) at Jun. 30, 2019		28,329,870
Ending Balance at Jun. 30, 2019	$ 12,156	$ 28	119,336	(107,199)	(9)
Balance (in shares) at Dec. 31, 2019	33,156,246	33,156,246
Beginning Balance at Dec. 31, 2019	$ 9,756	$ 33	132,214	(122,492)	1
Increase (Decrease) in Stockholders' Equity
Vesting of restricted stock units (in shares)		378,051
Stock-based compensation	1,338		1,338
Sales of common stock, net of offering costs (in shares)		19,166,667
Sale of common stock, net of offering costs	26,460	$ 19	26,441
Net loss	(8,005)			(8,005)
Foreign currency translation adjustment, net of tax	9				9
Balance (in shares) at Mar. 31, 2020		52,700,964
Ending Balance at Mar. 31, 2020	$ 29,558	$ 52	159,993	(130,497)	10
Balance (in shares) at Dec. 31, 2019	33,156,246	33,156,246
Beginning Balance at Dec. 31, 2019	$ 9,756	$ 33	132,214	(122,492)	1
Increase (Decrease) in Stockholders' Equity
Net loss	(15,220)
Foreign currency translation adjustment, net of tax	$ 17
Balance (in shares) at Jun. 30, 2020	53,112,681	53,112,681
Ending Balance at Jun. 30, 2020	$ 23,927	$ 53	161,568	(137,712)	18
Balance (in shares) at Mar. 31, 2020		52,700,964
Beginning Balance at Mar. 31, 2020	29,558	$ 52	159,993	(130,497)	10
Increase (Decrease) in Stockholders' Equity
Vesting of restricted stock units (in shares)		405,077
Vesting of restricted stock units	1	$ 1
Stock-based compensation	1,625		1,625
Additional offering costs in connection with February sale of common stock	(50)		(50)
Exercise of warrants (in shares)		6,640
Net loss	(7,215)			(7,215)
Foreign currency translation adjustment, net of tax	$ 8				8
Balance (in shares) at Jun. 30, 2020	53,112,681	53,112,681
Ending Balance at Jun. 30, 2020	$ 23,927	$ 53	$ 161,568	$ (137,712)	$ 18