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Stock-Based Compensation - Additional Information (Details) - 2012 Plan - RSUs
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
shares
Stock based compensation  
Vested/Released number of shares withheld to satisfy employee statutory tax obligations (in shares) 90,867
Vested RSUs which require deferral of share settlement and statutory tax obligations 17,692
Number of shares awarded (in shares) 578,000
Number of awards subject to time-based vesting (in shares) 1,126,126
Number of awards vesting upon achievement of performance goals (in shares) 238,145
Performance period 3 years
Vesting period 3 years
Unrecognized compensation expense | $ $ 17.7
Weighted average period for unrecognized compensation expense (in years) 1 year 10 months 13 days
Certain Executives and Key Employees  
Stock based compensation  
Number of shares awarded (in shares) 570,361
Number of awards subject to time-based vesting (in shares) 479,112
Number of awards vesting upon achievement of performance goals (in shares) 91,249
Performance period 3 years
Vesting period 3 years