Quarterly report pursuant to Section 13 or 15(d)

Equity and Share-Based Compensation - Stock Options (Details)

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Equity and Share-Based Compensation - Stock Options (Details) - 2016 LTIP - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Oct. 21, 2018
Sep. 30, 2018
Dec. 31, 2017
Share-Based Compensation      
Vesting period   3 years  
Expiration period (in years)   10 years  
Options      
Stock options outstanding at beginning of period (in shares)   245,845  
Vested (in shares) (67,414)    
Stock options outstanding at end of period (in shares)   137,516 245,845
Weighted Average Exercise Price      
Stock options outstanding at beginning of period (in dollars per share)   $ 19.66  
Stock options outstanding at end of period (in dollars per share)   $ 19.66 $ 19.66
Weighted Average Remaining Contractual Term (Years)      
Stock options outstanding at end of period (in years)   8 years 2 months 12 days 8 years 2 months 12 days
Vested and exercisable options, aggregate intrinsic value   $ 0  
Additional information      
Accelerated vesting due to change reduction in workforce (in shares)   102,092  
Unrecognized expense for share-based compensation   $ 300  
Weighted-average period for over which unrecognized expense will be recognized   7 months 6 days  
Options granted during the period   0  
$19.08-$19.66      
Options      
Vested (in shares)   (102,759)  
Exercise price (Lower limit)   $ 19.08  
Exercise price (Upper limit)   19.66  
Weighted Average Exercise Price      
Weighted average vested price of vested options (in dollars per share)   $ 19.66  
Weighted Average Remaining Contractual Term (Years)      
Vested (in years)   8 years 8 months 12 days  
$19.66      
Options      
Forfeited (in shares)   (5,570)  
Weighted Average Exercise Price      
Forfeited (in dollars per share)   $ 19.66  
Weighted Average Remaining Contractual Term (Years)      
Forfeited (in years)   1 month 6 days  
$19.08 - $20.97      
Options      
Vested and exercisable at end of period (in shares)   71,532  
Exercise price (Lower limit)   $ 19.08  
Exercise price (Upper limit)   20.97  
Weighted Average Exercise Price      
Vested and exercisable at end of period (in dollars per share)   $ 19.67  
Weighted Average Remaining Contractual Term (Years)      
Vested and exercisable at end of period (in years)   8 years 2 months 12 days  
Awards vesting on the six-month anniversary of the Effective Date      
Share-Based Compensation      
Percentage of awards vesting on each anniversary of the grant   16.67%  
Awards vesting on the twelve-month anniversary of the Effective Date      
Share-Based Compensation      
Percentage of awards vesting on each anniversary of the grant   16.67%  
Awards vesting on the twenty four-month anniversary of the Effective Date      
Share-Based Compensation      
Percentage of awards vesting on each anniversary of the grant   33.33%  
Awards vesting on the thirty six-month anniversary of the Effective Date      
Share-Based Compensation      
Percentage of awards vesting on each anniversary of the grant   33.33%