Selected Balance Sheet Components (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets	10 years		10 years
Depreciation expense	$ 438	$ 338
Machinery and equipment write off amount	150
Capital lease obligation	385	338
Laboratory Equipment [Member]
Finite-Lived Intangible Assets [Line Items]
Capital lease obligation	$ 209	$ 381