Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Allocation Of Proceeds (Details)

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Stockholders' Equity - Allocation Of Proceeds (Details) - Interstate Battery System International, Inc. and Other Investors
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Class of Stock [Line Items]  
Fair value $ 26,463
Allocated value 10,000
Convertible Note  
Class of Stock [Line Items]  
Fair value 4,879
Allocated value 1,844
Warrant  
Class of Stock [Line Items]  
Fair value 13,586
Allocated value 5,134
Common Stock  
Class of Stock [Line Items]  
Fair value 7,998
Allocated value $ 3,022