Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

v3.21.2
Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended
Aug. 12, 2021
Aug. 09, 2021
Aug. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Class A Common Stock          
Subsequent Event [Line Items]          
Common stock, par value (in dollars per share)       $ 0.01 $ 0.01
Subsequent Event          
Subsequent Event [Line Items]          
Proceeds from offering, gross   $ 31.9      
Proceeds from offering, net   $ 29.9      
Subsequent Event | Pre-Funded Warrants          
Subsequent Event [Line Items]          
Number of common shares called by warrants (in shares)   5,926,583      
Warrant exercise price (in dollars per share)   $ 0.01      
Subsequent Event | Standard Warrants          
Subsequent Event [Line Items]          
Number of common shares called by warrants (in shares)   6,075,950      
Warrant exercise price (in dollars per share)   $ 3.55      
Warrants outstanding, term   5 years      
Subsequent Event | Units          
Subsequent Event [Line Items]          
Number of securities called by each warrant (in shares)   0.6      
Subsequent Event | ATM Program          
Subsequent Event [Line Items]          
Proceeds from issuance of common stock $ 0.2        
Subsequent Event | Class A Common Stock          
Subsequent Event [Line Items]          
Shares issued in transaction (in shares)   4,200,000      
Subsequent Event | Class A Common Stock | ATM Program          
Subsequent Event [Line Items]          
Sale of stock, consideration received on transaction     $ 50.0    
Shares issued in transaction (in shares) 54,278