Consolidated Statement of Stockholders' Equity - 3 months ended Mar. 31, 2019 - USD ($) $ in Thousands	Total	Preferred Stock [Member] Series B Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Comprehensive Deficit [Member]
BALANCE at Dec. 31, 2018	$ 20,563		$ 28	$ 256,626	$ (236,091)
BALANCE, Shares at Dec. 31, 2018	5,500	1,000
BALANCE, Shares at Dec. 31, 2018	28,241,129		28,242,000
Non-cash compensation recognized on stock options and ESPP	$ 9			9
Restricted stock grants, net of cancellations	446		$ 1	445
Restricted stock grants, net of cancellations, shares			1,225,000
Cancellation of shares for payment of withholding tax	(207)			(207)
Cancellation of shares for payment of withholding tax, shares			(103,000)
Employee stock purchase plan	5			5
Employee stock purchase plan, shares			2,000
Common shares issued in stock offering, net of offering costs	(14)			(14)
Common shares issued in connection with Smart Retail acquisition, net	5,129		$ 3	5,126
Common shares issued in connection, with Smart Retail acquisition, net, shares			2,699,000
Preferred stock dividends	(34)				(34)
Cumulative effect of adoption of ASC 842	93				93
Comprehensive loss	48				48
BALANCE at Mar. 31, 2019	$ 26,038		$ 32	$ 261,990	$ (235,984)
BALANCE, Shares at Mar. 31, 2019	5,500	1,000
BALANCE, Shares at Mar. 31, 2019	32,064,848		32,065,000