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	30			30
Restricted stock grants, net of cancellations	1,109		$ 1	1,108
Restricted stock grants, net of cancellations, shares			1,225,000
Cancellation of shares for payment of withholding tax	(506)			(506)
Cancellation of shares for payment of withholding tax, shares			(176,000)
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
Employee stock purchase plan	10			10
Employee stock purchase plan, shares			4,000
Exercise of warrants	11,403		$ 5	11,398
Exercise of warrants, shares			5,304,000
Exercise of stock options	38			38
Exercise of stock options, shares			10,000
Conversion of preferred stock to common stock			$ 1	(1)
Conversion of preferred stock to common stock, shares		(1,000)	1,180,000
Preferred stock dividends	(119)				(119)
Cumulative effect of adoption of ASC | ASC 842 [Member]	93				93
Net income	7,051				7,051
BALANCE at Sep. 30, 2019	44,787		$ 38	273,815	(229,066)
BALANCE, Shares at Sep. 30, 2019			38,488,000
BALANCE at Jun. 30, 2019	29,666		$ 32	262,215	(232,581)
BALANCE, Shares at Jun. 30, 2019		1,000
BALANCE, Shares at Jun. 30, 2019			32,042,000
Non-cash compensation recognized on stock options and ESPP	10			10
Restricted stock grants, net of cancellations	340			340
Cancellation of shares for payment of withholding tax	(191)			(191)
Cancellation of shares for payment of withholding tax, shares			(38,000)
Employee stock purchase plan	6			6
Employee stock purchase plan, shares			2,000
Exercise of warrants	11,403		$ 5	11,398
Exercise of warrants, shares			5,301,000
Exercise of stock options	38			38
Exercise of stock options, shares			10,000
Conversion of preferred stock to common stock			$ 1	(1)
Conversion of preferred stock to common stock, shares		(1,000)	1,171,000
Preferred stock dividends	(52)				(52)
Net income	3,567				3,567
BALANCE at Sep. 30, 2019	44,787		$ 38	273,815	(229,066)
BALANCE, Shares at Sep. 30, 2019			38,488,000
BALANCE at Dec. 31, 2019	$ 48,684		$ 38	274,041	(225,395)
BALANCE, Shares at Dec. 31, 2019	38,475,084		38,475,000
Non-cash compensation recognized on stock options and ESPP	$ 48			48
Restricted stock grants, net of cancellations	2,204		$ 1	2,203
Restricted stock grants, net of cancellations, shares			1,000,000
Cancellation of shares for payment of withholding tax	(1,122)			(1,122)
Cancellation of shares for payment of withholding tax, shares			(242,000)
Employee stock purchase plan	19			19
Employee stock purchase plan, shares			6,000
Exercise of warrants	4,196		$ 2	4,194
Exercise of warrants, shares			2,047,000
Exercise of stock options	18			18
Exercise of stock options, shares			9,000
Net income	3,585				3,585
BALANCE at Sep. 30, 2020	$ 57,632		$ 41	279,401	(221,810)
BALANCE, Shares at Sep. 30, 2020	41,295,351		41,295,000
BALANCE at Jun. 30, 2020	$ 56,898		$ 41	278,828	(221,971)
BALANCE, Shares at Jun. 30, 2020			41,356,000
Non-cash compensation recognized on stock options and ESPP	19			19
Restricted stock grants, net of cancellations	792			792
Cancellation of shares for payment of withholding tax	(254)			(254)
Cancellation of shares for payment of withholding tax, shares			(66,000)
Employee stock purchase plan	13			13
Employee stock purchase plan, shares			4,000
Exercise of stock options	3			3
Exercise of stock options, shares			1,000
Net income	161				161
BALANCE at Sep. 30, 2020	$ 57,632		$ 41	$ 279,401	$ (221,810)
BALANCE, Shares at Sep. 30, 2020	41,295,351		41,295,000