Stockholders' Equity (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrecognized compensation expense	$ 3,000	$ 2,600	$ 3,900
Options granted (in shares)	1,697,883	2,056,700	466,600
Options, weighted average fair value at grant date	$ 1.77	$ 1.75	$ 6.23
Equity Incentive Plan 2018 [Member]
Shares reserved for future issuance	2,000,000