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Stockholders' Equity - Additional Information (Details) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($) $ / shares shares
Restricted Stock Awards |
Class of Stock [Line Items] |
Restricted stock and restricted stock units granted (in shares) | shares | 229
Grants in the period, aggregate fair value | $ 4.0
Unrecognized compensation costs related to restricted stock awards | $ 8.7
Weighted average period of recognition | 2 years 11 months 15 days
Stock Option Awards |
Class of Stock [Line Items] |
Weighted average period of recognition | 2 years 10 months 27 days
Options, granted (in shares) | shares | 252
Weighted average exercise price (in dollars per share) | $ / shares | $ 17.34
Unrecognized compensation costs related to options | $ 4.7
Performance Restricted Stock Units |
Class of Stock [Line Items] |
Restricted stock and restricted stock units granted (in shares) | shares | 49
Grants in the period, aggregate fair value | $ 0.8
Unrecognized compensation costs related to restricted stock awards | $ 1.3
Weighted average period of recognition | 2 years 6 months 25 days

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