Consolidated Statements of Stockholders' Equity - 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		1,000
BALANCE, Shares at Dec. 31, 2018			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
Net income	48				48
BALANCE at Mar. 31, 2019	26,038		$ 32	261,990	(235,984)
BALANCE, Shares at Mar. 31, 2019		1,000
BALANCE, Shares at Mar. 31, 2019			32,065,000
BALANCE at Dec. 31, 2019	$ 48,684		$ 38	274,041	(225,395)
BALANCE, Shares at Dec. 31, 2019	5,500
BALANCE, Shares at Dec. 31, 2019	38,475,084		38,475,000
Non-cash compensation recognized on stock options and ESPP	$ 13			13
Restricted stock grants, net of cancellations	619		$ 1	618
Restricted stock grants, net of cancellations, shares			1,000,000
Cancellation of shares for payment of withholding tax	(571)			(571)
Cancellation of shares for payment of withholding tax, shares			(110,000)
Employee stock purchase plan	5			5
Employee stock purchase plan, shares			2,000
Exercise of warrants	2,045		$ 1	2,044
Exercise of warrants, shares			1,009,000
Exercise of stock options	13			13
Exercise of stock options, shares			7,000
Net income	2,045				2,045
BALANCE at Mar. 31, 2020	$ 52,853		$ 40	$ 276,163	$ (223,350)
BALANCE, Shares at Mar. 31, 2020	5,500
BALANCE, Shares at Mar. 31, 2020	40,383,056		40,383,000