Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2019		33,156,000
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)		378,000
Stock-based compensation	1,338		1,338
Sales of common stock, net of offering costs (in shares)		19,167,000
Sale of common stock net of offering costs	26,460	$ 19	26,441
Net loss	(8,005)			(8,005)
Foreign currency translation adjustments, net of tax	9				9
Ending balance (in shares) at Mar. 31, 2020		52,701,000
Ending Balance at Mar. 31, 2020	29,558	$ 52	159,993	(130,497)	10
Beginning balance (in shares) at Dec. 31, 2019		33,156,000
Beginning Balance at Dec. 31, 2019	$ 9,756	$ 33	132,214	(122,492)	1
Ending balance (in shares) at Dec. 31, 2020	59,128,356	59,128,000
Ending Balance at Dec. 31, 2020	$ 25,053	$ 59	175,813	(150,906)	87
Increase (Decrease) in Stockholders' Equity
Vesting of restricted stock units (in shares)		195,000
Stock-based compensation	1,694		1,694
Sales of common stock, net of offering costs (in shares)		774,000
Sale of common stock net of offering costs	4,094	$ 1	4,093
Exercises of stock options (in shares)		104,000
Exercise of stock options	291		291
Net loss	(8,823)			(8,823)
Foreign currency translation adjustments, net of tax	$ (62)				(62)
Ending balance (in shares) at Mar. 31, 2021	60,201,721	60,201,000
Ending Balance at Mar. 31, 2021	$ 22,247	$ 60	$ 181,891	$ (159,729)	$ 25