Condensed Consolidated Statement of Stockholders' Equity - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional paid-in capital [Member]	Accumulated deficit [Member]
Beginning Balance at Dec. 31, 2017	$ 48,160	$ 1	$ 54,738	$ (6,579)
Beginning Balance (in shares) at Dec. 31, 2017		7,504,133
Dividends on redeemable convertible preferred stock	113	$ 0	113	0
Premium paid on redemption of redeemable convertible preferred stock	(2,219)	0	(2,219)	0
Stock-based compensation	1,121	$ 0	1,121	0
Stock-based compensation (in shares)		27,489
Exercise of warrants	0	$ 0	0	0
Exercise of warrants (in shares)		10,627
Net loss	(1,715)	$ 0	0	(1,715)
Ending Balance at Jun. 30, 2018	$ 45,460	$ 1	$ 53,753	$ (8,294)
Ending Balance (in shares) at Jun. 30, 2018		7,542,249