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Significant Accounting Policies - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Segment
$ / shares
Sep. 30, 2019
USD ($)
Accounting Policies [Abstract]        
Number of operating segments | Segment     1  
Period of stranded credit terms (not more than)     75 days  
Fair value $ 0.6   $ 0.6  
Unrealized gain 0.6   0.6  
Interest income $ 0.3 $ 0.5 $ 1.9 $ 1.8
Warrants exercise price (in dollars per share) | $ / shares $ 0.05   $ 0.05