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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments Debt And Equity Securities [Abstract] |
Summary of Cash Equivalents and Available-for-Sale Securities | The table below summarizes the Company’s cash equivalents and available-for-sale securities (in thousands):
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Fair Value |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 25,070 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,070 |
Commercial paper securities |  |  | 2,000 |  |  |  | — |  |  |  | — |  |  |  | 2,000 |
U.S. government sponsored entity debt securities |  |  | 38,866 |  |  |  | 1 |  |  |  | — |  |  |  | 38,867 |
Total |  |  | 65,936 |  |  |  | 1 |  |  |  | — |  |  |  | 65,937 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities |  | $ | 30,667 |  |  | $ | 50 |  |  | $ | — |  |  | $ | 30,717 |
Corporate debt securities |  |  | 17,275 |  |  |  | — |  |  |  | (12 | ) |  |  | 17,263 |
U.S. government sponsored entity debt securities |  |  | 91,562 |  |  |  | — |  |  |  | (24 | ) |  |  | 91,538 |
Total |  |  | 139,504 |  |  |  | 50 |  |  |  | (36 | ) |  |  | 139,518 |
Total cash equivalents and available-for-sale securities |  | $ | 205,440 |  |  | $ | 51 |  |  | $ | (36 | ) |  | $ | 205,455 |
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 3,182 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,182 |
Total |  |  | 3,182 |  |  |  | — |  |  |  | — |  |  |  | 3,182 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities |  | $ | 33,715 |  |  | $ | 33 |  |  | $ | — |  |  | $ | 33,748 |
Corporate debt securities |  |  | 22,831 |  |  |  | — |  |  |  | (18 | ) |  |  | 22,813 |
U.S. government sponsored entity debt securities |  |  | 163,671 |  |  |  | — |  |  |  | (40 | ) |  |  | 163,631 |
Total |  |  | 220,217 |  |  |  | 33 |  |  |  | (58 | ) |  |  | 220,192 |
Total cash equivalents and available-for-sale securities |  | $ | 223,399 |  |  | $ | 33 |  |  | $ | (58 | ) |  | $ | 223,374 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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