Statements of Shareholders' Equity - USD ($) $ in Thousands	Preferred Stock [Member] Series A Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2016		12,863,824
Balance at Dec. 31, 2016		$ 13	$ 74,356	$ (71,202)	$ 3,167
Cumulative-effect adjustment resulting from adoption of ASU 2016-09 at Dec. 31, 2016			28	(28)
Vesting of JV related stock-based compensation			22		22
Series A preferred stock issued on conversion of related party note and accrued interest on June 30, 2017, net of stock issuance costs of $9 (in shares)	4,250
Series A preferred stock issued on conversion of related party note and accrued interest on June 30, 2017, net of stock issuance costs of $9			4,241		4,241
Stock based compensation			1,270		1,270
Stock option/warrant exercises (in shares)		1,045,719
Stock option/warrant exercises		$ 1	3,977		3,978
Stock issued – on vested RSUs (in shares)		51,563
Stock issued for services (in shares)		60,316
Stock issued for services			142		142
Preferred stock dividends				(213)	(213)
Net income (loss)				(2,515)	(2,515)
Balance (in shares) at Dec. 31, 2017	4,250	14,021,422
Balance at Dec. 31, 2017		$ 14	84,036	(73,958)	10,092
Stock based compensation			1,519		1,519
Stock option/warrant exercises (in shares)		2,974,827
Stock option/warrant exercises		$ 3	12,897		12,900
Stock issued – on vested RSUs (in shares)		116,647
Stock issued for services (in shares)		5,939
Stock issued for services			36		36
Preferred stock dividends				(330)	(330)
Net income (loss)				3,266	3,266
Series A preferred stock redemption (in shares)	(4,250)
Series A preferred stock redemption			(4,241)	(9)	(4,250)
Stock issued for private equity transaction – Casdin Capital, net of legal fees of $85 (in shares)		1,428,571
Stock issued for private equity transaction – Casdin Capital, net of legal fees of $85		$ 2	19,913		19,915
Balance (in shares) at Dec. 31, 2018		18,547,406
Balance at Dec. 31, 2018		$ 19	$ 114,160	$ (71,031)	$ 43,148