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Cash and Investments (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2017 and December 31, 2016 (in thousands):
| March 31, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Cash and cash equivalents | $ | 183,179 |  |  | $ | — |  |  | $ | — |  |  | $ | 183,179 |
Short-term investments | 241,247 |  |  | 22 |  |  | (175 | ) |  | 241,094 |
Long-term investments | 47,416 |  |  | 15 |  |  | (80 | ) |  | 47,351 |
Long-term restricted cash and investments | 4,150 |  |  | — |  |  | — |  |  | 4,150 |
Total cash and investments | $ | 475,992 |  |  | $ | 37 |  |  | $ | (255 | ) |  | $ | 475,774 |
| 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 amounts presented exclude cash, but include investments classified as cash equivalents (in thousands):
| March 31, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market funds | $ | 44,641 |  |  | $ | — |  |  | $ | — |  |  | $ | 44,641 |
Commercial paper | 193,968 |  |  | — |  |  | — |  |  | 193,968 |
Corporate bonds | 175,244 |  |  | 37 |  |  | (220 | ) |  | 175,061 |
U.S. Treasury and government sponsored enterprises | 43,321 |  |  | — |  |  | (35 | ) |  | 43,286 |
Total investments | $ | 457,174 |  |  | $ | 37 |  |  | $ | (255 | ) |  | $ | 456,956 |
| 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 March 31, 2017 (in thousands):
| Mature within One Year |  | After One Year through Two Years |  | Fair Value
Money market funds | $ | 44,641 |  |  | $ | — |  |  | $ | 44,641 |
Commercial paper | 193,968 |  |  | — |  |  | 193,968 |
Corporate bonds | 132,355 |  |  | 42,706 |  |  | 175,061 |
U.S. Treasury and government sponsored enterprises | 40,639 |  |  | 2,647 |  |  | 43,286 |
Total investments | $ | 411,603 |  |  | $ | 45,353 |  |  | $ | 456,956 |

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