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Equity Incentive Plans - Company's Equity Incentive Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 7 Months Ended 8 Months Ended 12 Months Ended
Feb. 22, 2017
Apr. 13, 2016
Apr. 13, 2015
May 09, 2016
Jul. 11, 2014
Jul. 31, 2016
Aug. 22, 2017
Sep. 12, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity Incentive Plans [Line Items]                        
Number of shares granted                 944,000 1,035,000 135,230  
Number of shares vested during the period                 1,049,000 783,545 78,833  
Shares cancelled                   1,685    
Dividends on non-vested shares                 $ 0 $ 0 $ 0  
Share based compensation                 $ 9,267 $ 4,166 $ 2,684  
Number of options granted                 0 0 104,250  
Total unrecognised compensation cost relating to non-vested share option                 $ 336      
Total unrecognised compensation cost relating to restricted share awards                 $ 856      
Weighted average remaining term for non-vested share option awards                 2 years 3 months 12 days      
Weighted average remaining term for non-vested restricted share awards                 7 months 14 days      
Unvested shares                 280,000 385,000 135,230 78,833
Total fair value of shares vested during the period                 $ 12,023 $ 3,580 $ 1,301  
Equity Incentive Plan 2015                        
Equity Incentive Plans [Line Items]                        
Shares reserved for issuance     280,000                  
Number of shares granted     135,230                  
Grant date fair value     $ 17.75                  
Number of shares vested during the period   135,230                    
Equity Incentive Plan 2016                        
Equity Incentive Plans [Line Items]                        
Shares reserved for issuance       940,000                
Number of shares granted       690,000                
Vesting date                 Mar. 01, 2018      
Grant date fair value       $ 3.75                
Number of shares vested during the period           650,000            
Unvested shares                 40,000      
Equity Incentive Plan 2017                        
Equity Incentive Plans [Line Items]                        
Shares reserved for issuance 950,000                      
Number of shares granted 944,000                      
Vesting date                 Aug. 22, 2018      
Grant date fair value $ 9.59                      
Number of shares vested during the period             744,000          
Unvested shares                 200,000      
Employee Stock Option                        
Equity Incentive Plans [Line Items]                        
Number of options granted     104,250                  
Option exercise price     $ 27.5                  
Fair value assumptions - Expected term     5 years                  
Fair value assumptions - Expected volatility rate     59.274%                  
Fair value assumptions - Risk free interest rate     1.30%                  
Two directors                        
Equity Incentive Plans [Line Items]                        
Number of shares granted         3,000              
Number of shares vested during the period         3,000              
Directors and officers                        
Equity Incentive Plans [Line Items]                        
Number of shares granted               345,000        
Grant date fair value               $ 4.94        
Directors and officers | First installment                        
Equity Incentive Plans [Line Items]                        
Vesting date                 Mar. 30, 2017      
Unvested shares                 305,000      
Directors and officers | Second installment                        
Equity Incentive Plans [Line Items]                        
Vesting date                 Mar. 01, 2018      
Unvested shares                 40,000