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Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) shares | Jun. 30, 2018 USD ($) $ / shares shares
Restricted Stock Awards |  |
Class of Stock [Line Items] |  |
Restricted stock and restricted stock units granted (in shares) | shares | 13,000 | 242,000
Grants in the period, aggregate fair value | $ 0.2 | $ 4.2
Unrecognized compensation costs related to restricted stock awards | $ 7.6 | $ 7.6
Weighted average period of recognition |  | 2 years 9 months 7 days
Stock Option Awards |  |
Class of Stock [Line Items] |  |
Weighted average period of recognition |  | 2 years 8 months 26 days
Options, granted (in shares) | shares | 0 | 252,000
Weighted average exercise price (in dollars per share) | $ / shares |  | $ 17.34
Unrecognized compensation costs related to options | $ 4.1 | $ 4.1
Performance Restricted Stock Units |  |
Class of Stock [Line Items] |  |
Restricted stock and restricted stock units granted (in shares) | shares | 0 | 49,000
Grants in the period, aggregate fair value |  | $ 0.8
Unrecognized compensation costs related to restricted stock awards | $ 1.1 | $ 1.1
Weighted average period of recognition |  | 2 years 4 months 2 days

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