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Equity-Based Compensation - Summary of Stock Options that are Exercisable for the 2010 Plan and the Equity Plan (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
2010 Equity Award Plan [Member]  
Share-based Compensation Details  
Options exercisable (in shares) | shares 552,254
Outstanding, weighted-average exercise price $ 14.87
Weighted average remaining contractual life 7 years 9 months 18 days
Aggregate intrinsic value | $ $ 6,764
2000 Equity Award Plan [Member]  
Share-based Compensation Details  
Options exercisable (in shares) | shares 734,425
Outstanding, weighted-average exercise price $ 5.13
Weighted average remaining contractual life 3 years 9 months 18 days
Aggregate intrinsic value | $ $ 360,384
Range of Exercise Prices, $4.95 – $7.52 [Member] | 2010 Equity Award Plan [Member]  
Share-based Compensation Details  
Options exercisable (in shares) | shares 71,346
Outstanding, weighted-average exercise price $ 5.88
Weighted average remaining contractual life 8 years 3 months 19 days
Aggregate intrinsic value | $ $ 6,764
Exercise price range, lower limit $ 4.95
Exercise price range, upper limit $ 7.52
Range of Exercise Prices, $12.16 – $13.75 [Member] | 2010 Equity Award Plan [Member]  
Share-based Compensation Details  
Options exercisable (in shares) | shares 242,375
Outstanding, weighted-average exercise price $ 13.37
Weighted average remaining contractual life 7 years 10 months 25 days
Exercise price range, lower limit $ 12.16
Exercise price range, upper limit $ 13.75
Range of Exercise Prices, $15.04 – $16.93 [Member] | 2010 Equity Award Plan [Member]  
Share-based Compensation Details  
Options exercisable (in shares) | shares 90,533
Outstanding, weighted-average exercise price $ 15.65
Weighted average remaining contractual life 5 years 6 months
Exercise price range, lower limit $ 15.04
Exercise price range, upper limit $ 16.93
Range of Exercise Prices, $20.68 - $21.41 [Member] | 2010 Equity Award Plan [Member]  
Share-based Compensation Details  
Options exercisable (in shares) | shares 148,000
Outstanding, weighted-average exercise price $ 21.17
Weighted average remaining contractual life 8 years 8 months 12 days
Exercise price range, lower limit $ 20.68
Exercise price range, upper limit $ 21.41
Range of Exercise Prices, $3.25 – $4.90 [Member] | 2000 Equity Award Plan [Member]  
Share-based Compensation Details  
Options exercisable (in shares) | shares 458,425
Outstanding, weighted-average exercise price $ 4.31
Weighted average remaining contractual life 3 years
Aggregate intrinsic value | $ $ 360,384
Exercise price range, lower limit $ 3.25
Exercise price range, upper limit $ 4.90
Range of Exercise Prices, $5.25 – $7.18 [Member] | 2000 Equity Award Plan [Member]  
Share-based Compensation Details  
Options exercisable (in shares) | shares 276,000
Outstanding, weighted-average exercise price $ 6.48
Weighted average remaining contractual life 5 years 2 months 12 days
Exercise price range, lower limit $ 5.25
Exercise price range, upper limit $ 7.18