Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Clarios Agreement (Details)

v3.20.1
Stockholders' Equity - Clarios Agreement (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 07, 2017
Dec. 31, 2019
Dec. 31, 2018
May 24, 2016
Class of Stock [Line Items]        
Share price (in dollars per share)       $ 11.39
Proceeds from issuance of common stock, net of transaction costs   $ 29,380 $ 28,753  
Securities Purchase Agreement | Johnson Controls        
Class of Stock [Line Items]        
Share price (in dollars per share) $ 11.33      
Proceeds from issuance of common stock, net of transaction costs $ 10,600      
Legal fees $ 167      
Common Stock | Johnson Controls Agreement        
Class of Stock [Line Items]        
Common stock issued (in shares) 939,005