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Stockholders' Equity - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Threshold percentage of stock price trigger | 0.625% |  |  |
Number of warrants issued (in shares) |  |  |  | 13,490,236
Striking price of Warrants (USD per share) |  |  |  | $ 53.8475
Trading days measurement period (in days) | 160 days |  |  |
Stated interest rate for Warrants | 1.125% |  |  |
Unrecognized compensation expense | $ 19,000,000 |  |  |
Unrecognized compensation forfeited rate | 11.80% |  |  |
Weighted average grant date fair value of stock options granted (usd per share) | $ 41.43 |  |  |
Common stock issued during period (in shares) | 351,000 | 410,000 | 302,000 |
Separation Costs - Former Executives |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restructuring settled without cash | $ 23,000,000 |  |  |
Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average period of unrecognized compensation expense | 2 years 2 months |  |  |
Accelerating vesting awards (in shares) | 133,957 |  |  |
Performance Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average period of unrecognized compensation expense | 5 months |  |  |
Accelerating vesting awards (in shares) | 153,574 |  |  |
Performance Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average period of unrecognized compensation expense | 1 year 7 months |  |  |
Accelerating vesting awards (in shares) | 139,272 |  |  |
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense | $ 15,000,000 |  |  |
Weighted average period of unrecognized compensation expense | 2 years 9 months |  |  |
Risk free interest rate | 2.30% |  |  |
Expected volatility rate | 38.40% |  |  |
Dividend yield | 0.00% |  |  |
Expected term of awards | 8 years 5 months |  |  |
Options exercised, intrinsic value | $ 2,000,000 | $ 1,000,000 | $ 6,000,000 |
Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized (in shares) | 3,000,000 |  |  |
Dividend yield | 0.00% |  |  |
Expected term of awards | 6 months 4 days |  |  |
Employee purchase price as a percentage of stock price | 85.00% |  |  |
Maximum annual contribution per employee | $ 25,000 |  |  |
Risk-free interest rate, minimum | 0.10% |  |  |
Risk-free interest rate, maximum | 1.10% |  |  |
Minimum expected volatility rate inputs for fair value measurement | 30.00% |  |  |
Maximum expected volatility rate inputs for fair value measurement | 40.00% |  |  |
Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation (in shares) | 857,000 |  |  |
2011 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized (in shares) | 4,500,000.0 |  |  |
2011 Plan | Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum award vesting period | 4 years |  |  |
2011 Plan | Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum award vesting period | 4 years |  |  |
Stock option expiration period | 10 years |  |  |

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- Definition The number of warrants issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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