Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Summary of Number of RSUs Granted and Weighted-average Grant Date Fair Value of RSUs (Details)

v3.19.2
Share-Based Compensation - Summary of Number of RSUs Granted and Weighted-average Grant Date Fair Value of RSUs (Details) - Restricted Share Units (RSUs) - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of Shares, Unvested, Beginning balance 36,924  
Number of Shares, Granted 31,367 36,924
Number of Shares, Vested (36,924)  
Number of Shares, Unvested, Ending balance 31,367  
Weighted Average grant date fair value per share, Unvested, Beginning balance $ 13.00  
Weighted Average grant date fair value per share, Granted 7.01  
Weighted Average grant date fair value per share, Vested 13.00  
Weighted Average grant date fair value per share, Unvested, Ending balance $ 7.01