Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Preferred Stock [Member] Series A Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2017	22,000	17,674,729
Balance at Dec. 31, 2017	$ 21,523	$ 18	$ 202,953	$ (189,741)	$ (14)	$ 34,739
Stock-based compensation expense			821			821
Other comprehensive gain/(loss)					10	10
Net loss				(6,081)		(6,081)
Exercise of common stock options
Issuance of common stock upon ESPP purchase
Issuance of stock, net of issuance costs
Balance (in shares) at Mar. 31, 2018	22,000	17,674,729
Balance at Mar. 31, 2018	$ 21,523	$ 18	203,774	(195,822)	(4)	29,489
Balance (in shares) at Dec. 31, 2018	22,000	19,243,651
Balance at Dec. 31, 2018	$ 21,523	$ 19	209,366	(210,470)	5	20,443
Conversion of Series A convertible preferred stock into Common Stock (in shares)	(340)
Conversion of Series A convertible preferred stock into Common Stock	$ (340)
Conversion of Series A convertible preferred stock into Common Stock (in shares)		341,743
Conversion of Series A convertible preferred stock into Common Stock			340
Stock-based compensation expense			780			780
Other comprehensive gain/(loss)					(2)	(2)
Net loss				(6,531)		(6,531)
Balance (in shares) at Mar. 31, 2019	21,660	19,585,394
Balance at Mar. 31, 2019	$ 21,183	$ 19	$ 210,486	$ (217,001)	$ 3	$ 14,690