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Stockholders' Equity - Total Private Placement (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 13, 2018
May 09, 2018
Dec. 31, 2021
Stockholders' equity      
Fees and issuance costs     $ 6,534
Purchase Agreement      
Stockholders' equity      
Number of shares issued in transaction (in shares) 50,856,296 50,856,296  
Price per share (in dollars per share)   $ 1.64  
Percentage of ownership after transaction 25.00%    
Consideration received on transaction $ 83,400    
Fees and issuance costs $ 1,900    
Purchase Agreement | Purchase Percentage Covenant, Threshold      
Stockholders' equity      
Percentage of ownership after transaction   5.00%  
Purchase Agreement | Purchase Percentage Covenant, Maximum      
Stockholders' equity      
Percentage of ownership after transaction   30.00%