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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | $ 482,396 | $ 153,961
Total long-term investments | 5,471 | 5,196
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 107,869 | 69,432
Total short-term investments | 62,494 | 12,416
Total assets at fair value | 170,363 | 81,848
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 107,869 | 69,432
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 62,494 | 12,416
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 30,263 | 11,057
Total short-term investments | 419,902 | 141,545
Derivative instruments |  | 1,808
Other assets, net |  | 1,808
Total assets at fair value | 450,165 | 154,410
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 21,317 | 7,153
Total short-term investments | 197,626 | 44,442
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 8,946 | 3,904
Total short-term investments | 222,276 | 97,103
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | 5,471 | 5,196
Total assets at fair value | 5,471 | 5,196
Contingent consideration, noncurrent | 4,154 |
Total liabilities at fair value | 4,154 |
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | 5,471 | 5,196
Assets and liabilities measured at fair value on recurring basis | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 138,132 | 80,489
Total short-term investments | 482,396 | 153,961
Total long-term investments | 5,471 | 5,196
Derivative instruments |  | 1,808
Other assets, net |  | 1,808
Total assets at fair value | 625,999 | 241,454
Contingent consideration, noncurrent | 4,154 |
Total liabilities at fair value | 4,154 |
Assets and liabilities measured at fair value on recurring basis | Fair Value | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 107,869 | 69,432
Assets and liabilities measured at fair value on recurring basis | Fair Value | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 21,317 | 7,153
Total short-term investments | 197,626 | 44,442
Assets and liabilities measured at fair value on recurring basis | Fair Value | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 8,946 | 3,904
Total short-term investments | 284,770 | 109,519
Assets and liabilities measured at fair value on recurring basis | Fair Value | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | $ 5,471 | $ 5,196

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- Definition Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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