Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2017		19,511,276
Beginning Balance at Dec. 31, 2017	$ 20,712	$ 20	$ 88,447	$ (67,748)	$ (7)
Increase (Decrease) in Stockholders' Equity
Vesting of restricted stock units (in shares)		184,818
Stock-based compensation	1,108		1,108
Sales of common stock, net of offering costs (in shares)		5,714,286
Sales of common stock, net of offering costs	18,381	$ 6	18,375
Exercise of warrants (in shares)		15,000
Exercise of warrants	43		43
Common stock issued in exchange for warrants (in shares)		242,913
Net loss	(5,716)			(5,716)
Foreign currency translation adjustment, net of tax	21				21
Balance (in shares) at Mar. 31, 2018		25,668,293
Ending Balance at Mar. 31, 2018	$ 34,549	$ 26	107,973	(73,464)	14
Balance (in shares) at Dec. 31, 2018	27,391,290	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
Sales of common stock, net of offering costs (in shares)	0
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	27,648,287
Ending Balance at Mar. 31, 2019	$ 17,191	$ 27	$ 116,890	$ (99,701)	$ (25)