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Warrant to purchase common stock.

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Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended			12 Months Ended
	Jan. 16, 2018	Nov. 19, 2018	Oct. 29, 2018	Apr. 27, 2018	Dec. 31, 2019	Dec. 31, 2018
Warrants (Textual)
Fair value of warrants on the issuance					$ (21)	$ (837)
Underwritten public offering shares			653,062
Slipstream Communications, Llc [Member] \| Loan and Security Agreement [Member]
Warrants (Textual)
Revolving loan	$ 1,000			$ 1,100
Interest rate per annum	8.00%			8.00%
Maturity date	Jan. 16, 2019
Warrant to purchase common stock	61,729			143,791
Price per share	$ 8.10			$ 7.65
Fair value of warrants on the issuance	$ 266			$ 543
Price per share subject to subsequent abjustment	$ 6.09			$ 6.25
IPO [Member]
Warrants (Textual)
Gross proceeds to public offering		$ 10,000
Underwritten public offering shares		2,857,142
Common stock and warrants to purchase		1,428,571
Public offering price		$ 3.50
Repayment of debt		$ 1,283