CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Preferred Stock [Member] Convertible Preferred Stock - Series C [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Total
Beginning balance at Dec. 31, 2018	$ 1	$ 30	$ 241,988	$ (210,771)	$ 31,248
Beginning balance (in shares) at Dec. 31, 2018	9,968	29,943,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	$ 0	323	0	323
Conversion of convertible preferred stock into common stock	$ 0	$ 1	(1)	0	0
Conversion of convertible preferred stock into common stock (in shares)	(3,090)	1,148,698
Exercise of stock options	$ 0	$ 0	0	0	0
Exercise of stock options (in shares)	0	28,824
Net loss	$ 0	$ 0	0	(1,333)	(1,333)
Ending balance at Mar. 31, 2019	$ 1	$ 31	242,310	(212,104)	30,238
Ending balance (in shares) at Mar. 31, 2019	6,878	31,120,608
Beginning balance at Dec. 31, 2018	$ 1	$ 30	241,988	(210,771)	31,248
Beginning balance (in shares) at Dec. 31, 2018	9,968	29,943,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss					(3,275)
Ending balance at Sep. 30, 2019	$ 1	$ 33	242,868	(214,046)	28,856
Ending balance (in shares) at Sep. 30, 2019	2,103	32,903,287
Beginning balance at Mar. 31, 2019	$ 1	$ 31	242,310	(212,104)	30,238
Beginning balance (in shares) at Mar. 31, 2019	6,878	31,120,608
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	$ 0	303	0	303
Conversion of convertible preferred stock into common stock	$ 0	$ 2	(2)	0	0
Conversion of convertible preferred stock into common stock (in shares)	(4,775)	1,775,093
Exercise of stock options	$ 0	$ 0	0	0	0
Exercise of stock options (in shares)	0	7,586
Net loss	$ 0	$ 0	0	(1,082)	(1,082)
Ending balance at Jun. 30, 2019	$ 1	$ 33	242,611	(213,186)	29,459
Ending balance (in shares) at Jun. 30, 2019	2,103	32,903,287
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	$ 0	257	0	257
Net loss	0	0	0	(860)	(860)
Ending balance at Sep. 30, 2019	$ 1	$ 33	242,868	(214,046)	28,856
Ending balance (in shares) at Sep. 30, 2019	2,103	32,903,287
Beginning balance at Dec. 31, 2019	$ 1	$ 33	243,180	(214,561)	28,653
Beginning balance (in shares) at Dec. 31, 2019	2,103	32,932,273
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	$ 0	430	0	430
Conversion of convertible preferred stock into common stock	$ (1)	$ 1	0	0	0
Conversion of convertible preferred stock into common stock (in shares)	(2,103)	782,089
Net loss	$ 0	$ 0	0	(1,035)	(1,035)
Ending balance at Mar. 31, 2020	$ 0	$ 34	243,610	(215,596)	28,048
Ending balance (in shares) at Mar. 31, 2020	0	33,714,362
Beginning balance at Dec. 31, 2019	$ 1	$ 33	243,180	(214,561)	28,653
Beginning balance (in shares) at Dec. 31, 2019	2,103	32,932,273
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss					(3,969)
Ending balance at Sep. 30, 2020	$ 0	$ 34	244,423	(218,530)	25,927
Ending balance (in shares) at Sep. 30, 2020	0	33,754,909
Beginning balance at Mar. 31, 2020	$ 0	$ 34	243,610	(215,596)	28,048
Beginning balance (in shares) at Mar. 31, 2020	0	33,714,362
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	$ 0	410	0	410
Issuance of restricted stock	$ 0	$ 0	0	0	0
Issuance of restricted stock (in shares)	0	40,547
Net loss	$ 0	$ 0	0	(1,680)	(1,680)
Ending balance at Jun. 30, 2020	$ 0	$ 34	244,020	(217,276)	26,778
Ending balance (in shares) at Jun. 30, 2020	0	33,754,909
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	$ 0	403	0	403
Net loss	0	0	0	(1,254)	(1,254)
Ending balance at Sep. 30, 2020	$ 0	$ 34	$ 244,423	$ (218,530)	$ 25,927
Ending balance (in shares) at Sep. 30, 2020	0	33,754,909