Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.20.1
Commitments and Contingencies - Additional Information (Details)
1 Months Ended 12 Months Ended
Feb. 20, 2019
USD ($)
Feb. 04, 2019
USD ($)
Dec. 03, 2018
USD ($)
day
Jun. 24, 2018
USD ($)
Apr. 19, 2018
USD ($)
Aug. 07, 2015
USD ($)
ft²
Jul. 31, 2018
USD ($)
ft²
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
One time severance expense     $ 900,000   $ 900,000        
Stock option award expense         $ 15,000        
Cash severance payment     $ 100,000            
Severance restricted stock units, weighted average price, number of trading days | day     20            
Volume weighted-average price     $ 33,333            
Lease area | ft²           21,697 14,016    
Payments for rent   $ 1,500,000       $ 37,000 $ 9,000    
Total rent expense               $ 600,000 $ 500,000
One time fee payable $ 500,000     $ 500,000          
Warrant shares issued (in shares) | shares               807,436  
Payments for Key-Man penalties               $ 2,000,000.0  
Interstate Battery System International, Inc. | Interstate Battery Agreement                  
Commitment paid per occurrence       $ 2,000,000.0          
Clarios | Clarios Agreement                  
Commitment paid per occurrence               $ 1,000,000.0  
Minimum                  
Exercise period of stock options         90 days        
Maximum                  
Exercise period of stock options         2 years        
Chief Operating Officer                  
Period in consideration     2 years   2 years        
Restricted stock units awarded as part of severance     21 months