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Share-Based Compensation - Restricted Ordinary Shares Rollforward (Details) - Restricted Stock
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Number of restricted shares  
Unvested and outstanding beginning balance (shares) | shares 314,744
Granted (shares) | shares 0
Vested (shares) | shares (91,416)
Canceled of forfeited (shares) | shares (50)
Unvested and outstanding ending balance (shares) | shares 223,278
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 0.00
Vested weighted average grant date fair value (usd per share) | $ / shares 4.32
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 $ 4.18