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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2016
Fair Value Measurements [Abstract] |
Fair Value Hierarchy | The following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value (in thousands):
|  | Fair Value at September 30, 2016 |  | Fair Value at December 31, 2015 |
Assets |  | Level 1 |  | Level 2 |  | Level 3 |  | Level 1 |  | Level 2 |  | Level 3 |
Money market funds |  | $ | 89,623 |  | $ | — |  | $ | — |  | $ | 14,950 |  | $ | — |  | $ | — |
U.S. Treasury securities |  |  | — |  |  | 15,078 |  |  | — |  |  | — |  |  | — |  |  | — |
Government-backed security |  |  | — |  |  | 22,000 |  |  | — |  |  | — |  |  | 20,000 |  |  | — |
Asset-backed securities |  |  | — |  |  | 43,151 |  |  | — |  |  | — |  |  | 28,924 |  |  | — |
Corporate debt securities |  |  | — |  |  | 122,106 |  |  | — |  |  | — |  |  | 137,213 |  | $ | — |
Total assets |  | $ | 89,623 |  | $ | 202,335 |  | $ | — |  | $ | 14,950 |  | $ | 186,137 |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes payable |  | $ | — |  | $ | 176,774 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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