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Stock-based Compensation - Restricted Common Stock (Details)
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Shares  
Outstanding at January 1, 2018 | shares 104,127
Vested (in shares) | shares (52,064)
Outstanding at September 30,2018 | shares 52,063
Weighted average grant date fair value  
Outstanding at January 1, 2018 (in dollars per share) | $ / shares $ 9.45
Vested (in dollars per share) | $ / shares 9.45
Outstanding at September 30,2018 (in dollars per share) | $ / shares $ 9.45