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Stockholders' Equity (Details Textual) (Detail) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($) $ / shares shares
Restricted Stock |
Class of Stock [Line Items] |
Shares of restricted stock granted (in shares) | shares | 223
Grants in the period, aggregate fair value | $ | $ 3.4
Unrecognized compensation costs related to restricted stock awards | $ | $ 7.8
Weighted average period of recognition | 2 years 11 months 12 days
Employee Stock Option |
Class of Stock [Line Items] |
Unrecognized compensation costs related to restricted stock awards | $ | $ 5.2
Weighted average period of recognition | 2 years 11 months 23 days
Options, granted (in shares) | shares | 239
Weighted average exercise price (in dollars per share) | $ / shares | $ 15.03
Performance Restricted Stock Units |
Class of Stock [Line Items] |
Options, granted (in shares) | shares | 45
Award vesting period | 3 years

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