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Stockholders' Equity - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Restricted Stock Awards    
Class of Stock [Line Items]    
Restricted stock and restricted stock units granted (in shares) | shares 20,000 273,000
Grants in the period, aggregate fair value $ 0.4 $ 4.0
Unrecognized compensation costs related to restricted stock awards $ 6.5 $ 6.5
Weighted average period of recognition   2 years 6 months 29 days
Stock Option Awards    
Class of Stock [Line Items]    
Weighted average period of recognition   2 years 8 months 1 day
Options, granted (in shares) | shares 0 239,000
Weighted average exercise price (in dollars per share) | $ / shares   $ 15.03
Unrecognized compensation costs related to options $ 4.0 $ 4.0
Performance Restricted Stock Units    
Class of Stock [Line Items]    
Restricted stock and restricted stock units granted (in shares) | shares 0 45,000
Grants in the period, aggregate fair value   $ 0.7
Unrecognized compensation costs related to restricted stock awards $ 0.5 $ 0.5
Weighted average period of recognition   2 years 4 months 27 days