Loan Payable to Silicon Valley Bank (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Feb. 21, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 23, 2017
Debt Instrument [Line Items]
Amortization of deferred financing costs		$ 77	$ 83
Deferred financing costs		36
Warrant [Member]
Debt Instrument [Line Items]
Amount borrowed				$ 2,000
Warrants to purchase, shares	8,247			7,321
Warrant exercise price, per share	$ 4.85			$ 5.46
Deferred financing costs		62
Aggregate deferred financing costs		196
Unamortized deferred financing costs		$ 36
Minimum [Member]
Debt Instrument [Line Items]
Warrant exercise price, per share		$ 3.00
Loan and Security Agreement [Member]
Debt Instrument [Line Items]
Amount borrowed	$ 2,000			$ 2,000
Periodic payment term	Payments of interest only on the principal balance were due monthly from the draw date through October 31, 2017, and, beginning on November 1, 2017
Periodic payments of principal and interest	$ 67
Base rate	4.25%
Prime rate plus variable spread per annum		6.25%
Debt instrument, maturity date		Apr. 01, 2020
Additional final payment fee percentage	5.80%
Amortization of deferred financing costs		$ 116
Prepayment fee if prepaid two years or more	1.00%
Interest rate on obligations due to bank	5.00%
Loan and Security Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Minimum legal judgments or legal actions amount triggering loan default	$ 50
Loan and Security Agreement [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Basis spread variable rate	0.75%	0.75%