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Stockholders' Equity - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of warrants issued (in shares) |  |  |  |  |  |  |  |  | 13,490,236
Striking price of Warrants (USD per share) |  |  |  |  |  |  |  |  | $ 53.8475
Cash paid for partial termination of 1.125% Warrants |  |  |  |  |  | $ 549,000,000 | $ 0 | $ 0 |
Unrecognized compensation expense |  |  | $ 35,000,000 |  |  | $ 35,000,000 |  |  |
Unrecognized compensation forfeited rate |  |  |  |  |  | 16.10% |  |  |
Weighted average grant date fair value of stock options granted (usd per share) |  |  |  |  |  | $ 41.43 |  |  |
Granted (in shares) |  |  |  |  |  | 0 |  | 0 |
Common stock issued during period (in shares) |  |  |  |  |  | 216,000 | 351,000 | 410,000 |
Separation Costs - Former Executives |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restructuring settled without cash |  |  |  |  |  |  | $ 23,000,000 |  |
RSAs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average period of unrecognized compensation expense |  |  |  |  |  | 2 years 7 months |  |  |
Accelerating vesting awards (in shares) |  |  |  |  |  |  | 133,957 |  |
PSAs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average period of unrecognized compensation expense |  |  |  |  |  | 2 months |  |  |
Accelerating vesting awards (in shares) |  |  |  |  |  |  | 153,574 |  |
PSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average period of unrecognized compensation expense |  |  |  |  |  | 2 years |  |  |
Accelerating vesting awards (in shares) |  |  |  |  |  |  | 139,272 |  |
Stock options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation expense |  |  | $ 9,000,000 |  |  | $ 9,000,000 |  |  |
Weighted average period of unrecognized compensation expense |  |  |  |  |  | 1 year 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 |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  | 3,000,000 |  |  | 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 |  |  |  |  |  | 0.40% |  |  |
Risk-free interest rate, maximum |  |  |  |  |  | 1.90% |  |  |
Minimum expected volatility rate inputs for fair value measurement |  |  |  |  |  | 31.00% |  |  |
Maximum expected volatility rate inputs for fair value measurement |  |  |  |  |  | 44.00% |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation (in shares) |  |  |  |  |  | 365,000 | 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 |  |  | 4,500,000.0 |  |  |
2011 Plan | RSAs |  |  |  |  |  |  |  |  |
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 |  |  |
1.625% Convertible Notes | Convertible Debt |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Convertible debt, shares converted in transaction (in shares) | 1,800,000 | 2,600,000 |  | 600,000 |  |  |  |  |
1.125% Warrants |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.125% |  |  | 1.125% |  |  |
Class of warrant |  |  | 6,200,000 |  |  | 6,200,000 |  |  |
Cash paid for partial termination of 1.125% Warrants |  |  | $ 130,000,000 | $ 306,000,000 | $ 113,000,000 |  |  |  |
Options terminated (in shares) |  |  | 1,500,000 | 3,400,000 | 2,400,000 |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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