Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional paid-in capital	Accumulated deficit
Beginning Balance (in shares) at Dec. 31, 2017		7,504
Beginning Balance at Dec. 31, 2017	$ 48,160	$ 1	$ 54,738	$ (6,579)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of warrants (in shares)		11
Exercise of warrants	0
Shares issued related to vested Restricted stock units (in shares)		78
Shares issued related to vested restricted stock units	0
Stock-based compensation	2,159		2,159
Premium paid on redemption of redeemable convertible preferred stock	(2,219)		(2,219)
Dividends on redeemable convertible preferred stock	113		113
Net loss	(1,845)			(1,845)
Ending Balance (in shares) at Dec. 31, 2018		7,593
Ending Balance at Dec. 31, 2018	46,368	$ 1	54,791	(8,424)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued related to vested Restricted stock units (in shares)		96
Shares issued related to vested restricted stock units	0
Stock-based compensation	1,766		1,766
Net loss	(1,775)			(1,775)
Net loss | Accounting Standards Update 2016-02	0
Ending Balance (in shares) at Dec. 31, 2019		7,689
Ending Balance at Dec. 31, 2019	$ 46,870	$ 1	$ 56,557	$ (9,688)