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Cash and Cash Equivalents and Investments | 12 Months Ended
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Dec. 31, 2015
Cash and Cash Equivalents and Investments [Abstract] |
Cash and Cash Equivalents and Investments | Cash and Cash Equivalents and Investments The fair value of cash and cash equivalents and investments held at December 31, 2015 and 2014 are as follows:
| As of December 31, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  | (in thousands) |  |
Cash and cash equivalents | $ | 202,989 |  |  | $ | — |  |  | $ | — |  |  | $ | 202,989 |
Securities maturing within one year: |  |  |  |  |  |  |
U.S. treasury securities | 313,105 |  |  | 2 |  |  | (219 | ) |  | 312,888 |
Corporate debt securities | 5,477 |  |  | — |  |  | (2 | ) |  | 5,475 |
Total short-term investments | $ | 318,582 |  |  | $ | 2 |  |  | $ | (221 | ) |  | $ | 318,363 |
Total cash and cash equivalents and investments | $ | 521,571 |  |  | $ | 2 |  |  | $ | (221 | ) |  | $ | 521,352 |
| As of December 31, 2014
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  | (in thousands) |  |
Cash and cash equivalents | $ | 137,266 |  |  | $ | — |  |  | $ | — |  |  | $ | 137,266 |
Securities maturing within one year: |  |  |  |  |  |  |
Certificates of deposit | 552 |  |  | — |  |  | — |  |  | 552 |
U.S. treasury securities | 201,584 |  |  | 3 |  |  | (66 | ) |  | 201,521 |
Total short-term investments | $ | 202,136 |  |  | $ | 3 |  |  | $ | (66 | ) |  | $ | 202,073 |
Total cash and cash equivalents and investments | $ | 339,402 |  |  | $ | 3 |  |  | $ | (66 | ) |  | $ | 339,339 |
There were no realized gains or losses for the year ended December 31, 2015, no realized gains or losses for the year ended December 31, 2014, and no realized gains or losses for the year ended December 31, 2013.

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- Definition Cash and Cash Equivalents and Investments [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4273-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 6.H.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13728-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H -Subsection 3 + Details
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