Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net (Details)

v3.20.1
Property and Equipment, Net (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Useful Life 6 years    
Property and equipment $ 3,321   $ 3,320
Less: Accumulated depreciation and amortization (3,048)   (3,038)
Property and equipment, net 273 $ 282 282
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 2,894   2,893
Machinery and equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful Life 3 years    
Machinery and equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful Life 10 years    
Office furniture and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 49   49
Office furniture and equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful Life 3 years    
Office furniture and equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful Life 10 years    
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 228   228
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 150   $ 150