CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Beginning balance, amount at Dec. 31, 2015	$ 23,404	$ 2	$ 27	$ 42,859	$ (19,484)
Beginning balance (in shares) at Dec. 31, 2015		1,976	27,051
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised, shares			31
Options exercised, amount	119			119
Warrants exercised, shares			133
Warrants exercised, amount	316			316
Stock based compensation	533			533
Stock swap to acquire options and warrants, shares			(73)
Stock swap to acquire options and warrants, amount	(315)			(315)
Net loss	(3,428)				(3,428)
Ending balance, amount at Sep. 30, 2016	20,629	$ 2	$ 27	43,512	(22,912)
Ending balance (in shares) at Sep. 30, 2016		1,976	27,142
Beginning balance, amount at Dec. 31, 2016	26,223	$ 1	$ 31	49,625	(23,434)
Beginning balance (in shares) at Dec. 31, 2016		976	30,860
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised, shares			21
Options exercised, amount	275			275
Conversion of Series B convertible preferred to common stock, shares		(976)	1,951
Conversion of Series B convertible preferred to common stock, amount	0	$ (1)	$ 2	(1)
Stock based compensation	532			532
Stock swap to acquire options and warrants, shares			0
Stock swap to acquire options and warrants, amount	(275)			(275)
Net loss	(4,238)				(4,238)
Ending balance, amount at Sep. 30, 2017	$ 22,517	$ 0	$ 33	$ 50,156	$ (27,672)
Ending balance (in shares) at Sep. 30, 2017		0	32,832