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Balance Sheet Details - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,540   $ 1,243
Less: accumulated depreciation (918)   (849)
Total, net 622   394
Depreciation expense $ 100 $ 100  
Research equipment      
Property, Plant and Equipment [Line Items]      
Useful Life 5 years    
Property and equipment, gross $ 608   608
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Useful Life 3 years    
Property and equipment, gross $ 105   13
Office furniture      
Property, Plant and Equipment [Line Items]      
Useful Life 5 years    
Property and equipment, gross $ 205   205
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 340   340
Construction in-process      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 282   $ 77
Maximum | Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Useful Life 5 years