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Stockholders' Deficit - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 19, 2017 | Jan. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for awards under incentive compensation plan (in shares) |  | 2,000,000.0 |  |  |
Maximum employee subscription rate |  | 15.00% |  |  |
Discount from market price |  | 15.00% |  |  |
Shares issued |  |  | 54,000 |  |
Average price of shares issues (in usd per share) |  |  | $ 30.63 |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period from first anniversary of grant |  |  | 4 years |  |
Award expiration period |  |  | 10 years |  |
Stock-based compensation expense recognized |  |  | $ 3.7 | $ 6.4 | $ 2.2
Stock options granted (in shares) |  |  | 700,000.0 |  |
Grants, weighted average grant date fair value (in usd per share) |  |  | $ 22.17 |  |
Fair value of options granted |  |  | $ 8.0 |  |
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized |  |  | $ 9.0 |  |
Unvested stock options (in shares) |  |  | 1,800,000 |  |
Weighted-average period of amortization |  |  | 2 years |  |
Average remaining contract term |  |  | 8 years 5 months |  |
Options exercisable at end of period (in usd per share) |  |  | $ 14.11 |  |
Cash received from exercise of stock options |  |  | $ 8.7 |  |
Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period from first anniversary of grant |  |  | 4 years |  |
Stock-based compensation expense recognized |  |  | $ 23.0 | $ 28.8 | $ 22.9
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized |  |  | $ 33.2 |  |
Weighted-average period of amortization |  |  | 2 years |  |
2003 Incentive Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for awards under incentive compensation plan (in shares) |  |  | 19,400,000 |  |
Shares available for grant (in shares) |  |  | 3,600,000 |  |
Preexisting Incentive Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares reserved for issuance (less than) |  |  | 100,000.0 |  |
Series C Preferred Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares reserved for issuance (in shares) | 20,000 |  |  |  |
Preferred par value (in usd per share) | $ 0.001 |  |  |  |
Shares holders are entitled to (in shares) | 0.0001 |  |  |  |
Exercise price of rights (in usd per share) | $ 109.00 |  |  |  |
Preferred shares outstanding (in shares) |  |  | 0 |  |
Series A Preferred Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Preferred par value (in usd per share) | $ 0.01 |  |  |  |
Preferred Share Purchase Right | Series A Preferred Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Preferred dividend (in shares) | 1 |  |  |  |
Preferred shares issued on exercise (in shares) |  |  | 0 |  |

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