CONDENSED CONSOLIDATED STATEMENTS OF MEZZANINE EQUITY AND STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Redeemable Preferred Stock	Common stock	Treasury Stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2018			2,025,000
Beginning balance at Dec. 31, 2018	$ 25,800		$ 2	$ (5,728)	$ 145,428	$ (22)	$ (113,880)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	112				112
Shares issued under stock incentive plans, net of shares withheld for employee taxes (in shares)			6,000
Shares issued under stock incentive plans, net of shares withheld for employee taxes	(24)				(24)
Net loss	(1,657)						(1,657)
Reclassification of tax provision impact	22					22
Ending balance (in shares) at Mar. 31, 2019			2,031,000
Ending balance at Mar. 31, 2019	24,253		$ 2	(5,728)	145,516	0	(115,537)
Beginning balance (in shares) at Dec. 31, 2018			2,025,000
Beginning balance at Dec. 31, 2018	25,800		$ 2	(5,728)	145,428	(22)	(113,880)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2,866)
Ending balance (in shares) at Jun. 30, 2019			2,042,000
Ending balance at Jun. 30, 2019	23,212		$ 2	(5,728)	145,706	0	(116,768)
Beginning balance (in shares) at Mar. 31, 2019			2,031,000
Beginning balance at Mar. 31, 2019	24,253		$ 2	(5,728)	145,516	0	(115,537)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	190				190
Shares issued under stock incentive plans, net of shares withheld for employee taxes (in shares)			9,000
Shares issued for fractional shares in conjunction with reverse stock split (in shares)			2,000
Net loss	(1,209)						(1,209)
Reclassification of tax provision impact	(22)						(22)
Ending balance (in shares) at Jun. 30, 2019			2,042,000
Ending balance at Jun. 30, 2019	$ 23,212		$ 2	(5,728)	145,706	$ 0	(116,768)
Redeemable Preferred stock, beginning balance (in shares) at Dec. 31, 2019		1,916,000
Redeemable Preferred stock, beginning balance at Dec. 31, 2019		$ 19,602
Beginning balance (in shares) at Dec. 31, 2019	2,050,659		2,050,000
Beginning balance at Dec. 31, 2019	$ 21,095		$ 0	(5,728)	145,352		(118,529)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	109				109
Shares issued under stock incentive plans, net of shares withheld for employee taxes (in shares)			5,000
Accrued dividend on redeemable preferred stock	(484)	$ 484
Net loss	(2,953)						(2,953)
Redeemable Preferred stock, ending balance (in shares) at Mar. 31, 2020		1,916,000
Redeemable Preferred stock,ending balance at Mar. 31, 2020		$ 20,086
Ending balance (in shares) at Mar. 31, 2020			2,055,000
Ending balance at Mar. 31, 2020	$ 17,767		$ 0	(5,728)	144,977		(121,482)
Redeemable Preferred stock, beginning balance (in shares) at Dec. 31, 2019		1,916,000
Redeemable Preferred stock, beginning balance at Dec. 31, 2019		$ 19,602
Beginning balance (in shares) at Dec. 31, 2019	2,050,659		2,050,000
Beginning balance at Dec. 31, 2019	$ 21,095		$ 0	(5,728)	145,352		(118,529)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (4,240)
Redeemable Preferred stock, ending balance (in shares) at Jun. 30, 2020		1,916,000
Redeemable Preferred stock,ending balance at Jun. 30, 2020		$ 20,570
Ending balance (in shares) at Jun. 30, 2020	4,692,451		4,692,000
Ending balance at Jun. 30, 2020	$ 21,110		$ 0	(5,728)	149,607		(122,769)
Redeemable Preferred stock, beginning balance (in shares) at Mar. 31, 2020		1,916,000
Redeemable Preferred stock, beginning balance at Mar. 31, 2020		$ 20,086
Beginning balance (in shares) at Mar. 31, 2020			2,055,000
Beginning balance at Mar. 31, 2020	17,767		$ 0	(5,728)	144,977		(121,482)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	151				151
Shares issued under stock incentive plans, net of shares withheld for employee taxes (in shares)			42,000
Shares issued under stock incentive plans, net of shares withheld for employee taxes	(13)				(13)
Accrued dividend on redeemable preferred stock	(484)	$ 484
Net proceeds from sale of common stock and warrants (in shares)			2,450,000
Net proceeds from sale of common stock and warrants	4,203				4,203
Proceeds from exercise of warrants (in shares)			145,000
Proceeds from exercise of warrants	773				773
Net loss	$ (1,287)						(1,287)
Redeemable Preferred stock, ending balance (in shares) at Jun. 30, 2020		1,916,000
Redeemable Preferred stock,ending balance at Jun. 30, 2020		$ 20,570
Ending balance (in shares) at Jun. 30, 2020	4,692,451		4,692,000
Ending balance at Jun. 30, 2020	$ 21,110		$ 0	$ (5,728)	$ 149,607		$ (122,769)