Annual report pursuant to Section 13 and 15(d)

Going Concern (Details)

v3.20.1
Going Concern (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 13, 2019
Accumulated deficit $ (84,464) $ (61,378)  
Total current assets 30,167 22,051  
Total current liabilities 11,344 2,393  
Working capital 26,577    
Cash and cash equivalents and investments 28,731    
Net loss $ (23,086) $ (22,257)  
Term debt under loan agreement     $ 8,000
Percentage of materials 50.00%    
Silicon Valley Bank [Member]      
Unrestricted cash $ 10,000