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Share-Based Compensation - Schedule of Activity for Non-Vested Awards Granted (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 11 Months Ended 12 Months Ended
Feb. 09, 2018
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Number of shares at beginning of period | shares 678,599 0 1,410,210  
Number of shares granted | shares 0 1,184,352 845,422  
Number of shares vested and settled | shares 0 (251,632) (1,062,068)  
Number of shares forfeited | shares   (130,866) (198,790)  
Number of shares canceled | shares (678,599)   (316,175)  
Number of shares at end of period | shares 0 801,854 678,599 1,410,210
Number of non-vested shares expected to vest at end of period | shares   801,854    
Weighted-average grant date fair value per share at beginning of period | $ / shares $ 9.07   $ 16.71  
Weighted-average grant date fair value per share, shares granted | $ / shares   $ 4.67 1.28  
Weighted-average grant date fair value per share, shares vested and settled | $ / shares   5.50 4.60  
Weighted-average grant date fair value per share, shares forfeited | $ / shares   5.33 $ 13.97  
Weighted-average grant date fair value per share, shares canceled | $ / shares 9.07   34.25  
Weighted-average grant date fair value per share at end of period | $ / shares   4.30 $ 9.07 $ 16.71
Weighted-average grant date fair value per share, non-vested shares expected to vest at end of period | $ / shares   $ 4.30    
Weighted-average contractual term at end of period   9 years 6 months 20 days 5 years 5 months 4 years 8 months 6 days
Weighted-average contractual term, non-vested shares expected to vest   9 years 6 months 20 days    
Aggregate intrinsic value, shares vested and settled | $   $ 692 $ 709  
Aggregate intrinsic value at end of period | $   80 $ 572 $ 6,698
Aggregate intrinsic value, non-vested shares expected to vest | $   $ 80