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Share-Based Compensation - Restricted Ordinary Shares Rollforward (Details) - Restricted Stock
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Number of restricted shares  
Unvested and outstanding beginning balance (in shares) | shares 314,744
Granted (in shares) | shares 0
Vested (in shares) | shares (182,249)
Canceled of forfeited (in shares) | shares (1,969)
Unvested and outstanding ending balance (in shares) | shares 130,526
Weighted average grant date fair value  
Unvested and outstanding beginning balance weighted average grant date fair value (usd per share) | $ / shares $ 4.22
Granted weighted average grant date fair value (usd per share) | $ / shares 0
Vested weighted average grant date fair value (usd per share) | $ / shares 4.26
Canceled or forfeited weighted average grant date fair value (usd per share) | $ / shares 4.44
Unvested and outstanding ending balance weighted average grant date fair value (usd per share) | $ / shares $ 4.17