Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balances (in shares) at Dec. 31, 2017	1,221,064	138,492
Balances at Dec. 31, 2017	$ 1		$ 41,259	$ (79,982)	$ (38,722)
Issuance of common stock upon conversion of convertible promissory notes, related parties (in shares)		1,571,702
Issuance of common stock upon conversion of convertible promissory notes, related parties		$ 157	35,420		35,577
Issuance of common stock upon conversion of convertible preferred stock (in shares)	(1,221,064)	1,918,543
Issuance of common stock upon conversion of convertible preferred stock	$ (1)	$ 192	(191)
Reclassification of warrant to equity			70		70
Issuance of common stock upon reverse merger (in shares)		3,510,439
Issuance of common stock upon reverse merger		$ 365	31,403		31,768
Issuance of common stock upon exercise of stock options (in shares)		2,013
Issuance of common stock upon exercise of stock options			13		13
Stock-based compensation			86		86
Net (loss) income				2,314	2,314
Balances (in shares) at Mar. 31, 2018		7,141,189
Balances at Mar. 31, 2018		$ 714	108,060	(77,668)	31,106
Balances (in shares) at Dec. 31, 2018		7,141,189
Balances at Dec. 31, 2018		$ 714	108,513	(97,989)	11,238
Reclassification of warrant to equity			100		100
Stock-based compensation			164		164
Net (loss) income				(1,339)	(1,339)
Cumulative effect of adoption of new leases standard at Dec. 31, 2018				(27)	(27)
Balances as of January 1, 2019, as adjusted at Dec. 31, 2018		$ 714	108,513	(98,016)	11,211
Issuance of common stock and warrants, net of offering costs of $560 (in shares)		1,200,000
Issuance of common stock and warrants, net of offering costs of $560		$ 120	2,320		2,440
Balances (in shares) at Mar. 31, 2019		8,341,189
Balances at Mar. 31, 2019		$ 834	$ 111,097	$ (99,355)	$ 12,576