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Share-based Compensation - Stock Option Activity (Details)
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]  
Unvested, beginning balance (in shares) | shares 359,259
Vested (in shares) | shares (87,476)
Forfeited/Canceled (in shares) | shares (42,515)
Unvested, ending balance (in shares) | shares 229,268
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Unvested, weighted average grant date fair value at beginning of period (in dollars per share) | $ / shares $ 4.95
Vested, weighted average grant date fair value (in dollars per share) | $ / shares 5.05
Forfeited/Canceled, weighted average grant date fair value (in dollars per share) | $ / shares 5.00
Unvested, weighted average grant date fair value at end of period (in dollars per share) | $ / shares $ 4.90