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Cash and Investments (Tables) | 6 Months Ended
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Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-Sale Securities | The following tables summarize cash and cash equivalents, investments, and restricted cash and investments by balance sheet line item as of June 30, 2017 and December 31, 2016 (in thousands):
| June 30, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Cash and cash equivalents | $ | 135,212 |  |  | $ | — |  |  | $ | — |  |  | $ | 135,212 |
Short-term investments | 214,172 |  |  | 15 |  |  | (143 | ) |  | 214,044 |
Long-term investments | 26,404 |  |  | 26 |  |  | (17 | ) |  | 26,413 |
Long-term restricted cash and investments | 4,650 |  |  | — |  |  | — |  |  | 4,650 |
Total cash and investments | $ | 380,438 |  |  | $ | 41 |  |  | $ | (160 | ) |  | $ | 380,319 |
| December 31, 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Cash and cash equivalents | $ | 151,686 |  |  | $ | — |  |  | $ | — |  |  | $ | 151,686 |
Short-term investments | 268,234 |  |  | 13 |  |  | (130 | ) |  | 268,117 |
Long-term investments | 55,792 |  |  | 1 |  |  | (192 | ) |  | 55,601 |
Long-term restricted cash and investments | 4,150 |  |  | — |  |  | — |  |  | 4,150 |
Total cash and investments | $ | 479,862 |  |  | $ | 14 |  |  | $ | (322 | ) |  | $ | 479,554 |
Summary of Cash Equivalents and Investments by Security Type | The following tables summarize our cash equivalents and investments by security type as of June 30, 2017 and December 31, 2016. The amounts presented exclude cash, but include investments classified as cash equivalents (in thousands):
| June 30, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market funds | $ | 48,253 |  |  | $ | — |  |  | $ | — |  |  | $ | 48,253 |
Commercial paper | 303,877 |  |  | 41 |  |  | (132 | ) |  | 303,786 |
Corporate bonds | 550 |  |  | — |  |  | — |  |  | 550 |
U.S. Treasury and government sponsored enterprises | 15,664 |  |  | — |  |  | (28 | ) |  | 15,636 |
Total investments | $ | 368,344 |  |  | $ | 41 |  |  | $ | (160 | ) |  | $ | 368,225 |
| December 31, 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market funds | $ | 71,457 |  |  | $ | — |  |  | $ | — |  |  | $ | 71,457 |
Commercial paper | 165,375 |  |  | — |  |  | — |  |  | 165,375 |
Corporate bonds | 152,712 |  |  | 3 |  |  | (308 | ) |  | 152,407 |
U.S. Treasury and government sponsored enterprises | 70,730 |  |  | 11 |  |  | (14 | ) |  | 70,727 |
Total investments | $ | 460,274 |  |  | $ | 14 |  |  | $ | (322 | ) |  | $ | 459,966 |
Summary of Available-for-Sale Securities by Contractual Maturity | The following table summarizes the fair value of securities classified as available-for-sale by contractual maturity as of June 30, 2017 (in thousands):
| Mature within One Year |  | After One Year through Two Years |  | Fair Value
Money market funds | $ | 48,253 |  |  | $ | — |  |  | $ | 48,253 |
Commercial paper | 281,572 |  |  | 22,214 |  |  | 303,786 |
Corporate bonds | — |  |  | 550 |  |  | 550 |
U.S. Treasury and government sponsored enterprises | 13,986 |  |  | 1,650 |  |  | 15,636 |
Total investments | $ | 343,811 |  |  | $ | 24,414 |  |  | $ | 368,225 |

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