Annual report pursuant to Section 13 and 15(d)

Related Party Transactions (Details)

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Related Party Transactions (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]        
Proceeds from sale of inventory parts and tooling   $ 14    
Angel Pond Capital LLC        
Related Party Transaction [Line Items]        
Consulting agreement term 1 year      
Aggregate payments   30 $ 90 $ 2,195
Expense charged to general and administrative expense     $ 1,075  
Future payment   $ 1,000