Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan (Details)

v3.10.0.1
Equity Incentive Plan (Details)
6 Months Ended
Nov. 01, 2017
Jun. 30, 2018
$ / shares
shares
Jun. 30, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted common shares reserved for issuance under equity incentive plan (in shares) | shares   6,500,000  
Reverse stock split, conversion ratio 0.50    
Number of restricted common shares granted during period under equity incentive plan (in shares) | shares   985,616 671,845
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share) | $ / shares   $ 15.14 $ 17.60
Director [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted common shares granted during period under equity incentive plan (in shares) | shares   44,245 34,559
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share) | $ / shares   $ 15.48 $ 19.82
Key Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted common shares granted during period under equity incentive plan (in shares) | shares   941,371 637,286
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share) | $ / shares   $ 15.12 $ 17.48
Common stock share price (in usd per share) | $ / shares   $ 15.80  
Award vesting period of restricted common shares granted during period under equity incentive plan   3 years