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Liquidity (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Liquidity (Details Narrative) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 8,002	$ 11,703	$ 8,002	$ 11,703	$ 15,199	$ 602
Accounts receivable, net	8,640		8,640		3,437
Total current assets	18,245		18,245		19,808
Total current liabilities	7,762		7,762		$ 8,091
Net loss	3,042	$ 3,316	8,152	7,208
Net cash used in operating activities			$ 6,800	$ 12,884
November 2018 [Member]
Line of credit facility, description			The proceeds of the term loan is expected to be used for laboratory capital expenditures and will be repaid monthly.. The balance of the Line of Credit is available for working capital purposes and has a three-year term. The borrowing limit of the revolving line of credit is the lower of 80% of the company's eligible accounts receivable (as adjusted by SVB) and the aggregate amount of cash collections with respect to accounts receivable during the three prior calendar months.
Line of credit, percentage			0.50%
November 2018 [Member] \| Prime Rate [Member]
Line of credit, percentage			5.00%
November 2018 [Member] \| Silicon Valley Bank [Member]
Line of credit facility	850		$ 850
Line of credit facility term loan			3 years
November 2018 [Member] \| Silicon Valley Bank [Member] \| Maximum [Member]
Line of credit facility	$ 4,000		$ 4,000