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Equity Incentive Plans (Details) - USD ($)
$ in Thousands
2 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended
Feb. 22, 2017
Jun. 30, 2017
Jun. 30, 2016
Aug. 22, 2017
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity Incentive Plans [Line Items]              
Number of shares granted   944,000 690,000        
Number of shares vested   305,000 133,545        
Number of unvested shares   1,024,000 690,000     385,000 135,230
Share based compensation   $ 6,360 $ 2,285        
Total unrecognised compensation cost relating to restricted share awards   3,689          
Total unrecognised compensation cost relating to non-vested share option   $ 410          
Weighted average remaining term for non-vested restricted share awards   6 months 22 days          
Weighted average remaining term for non-vested share option awards   2 years 9 months 14 days          
2017 Equity Incentive Plan              
Equity Incentive Plans [Line Items]              
Shares reserved for issuance 950,000            
Number of shares granted 944,000            
Number of shares vested       744,000      
Number of unvested shares   200,000          
Vesting date   Aug. 22, 2018          
Stock issued during period, share based compensation         737,725