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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2016
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value | The following table presents the fair value of the Company’s financial assets and liabilities determined using the inputs defined above (amounts in thousands).
|  | December 31, 2016 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 11,270 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,270 |
Corporate bonds |  |  | — |  |  |  | 21,841 |  |  |  | — |  |  |  | 21,841 |
Commercial paper |  |  | — |  |  |  | 10,769 |  |  |  | — |  |  |  | 10,769 |
Governmental bonds |  |  | — |  |  |  | 41,289 |  |  |  | — |  |  |  | 41,289 |
Total financial assets |  | $ | 11,270 |  |  | $ | 73,899 |  |  | $ | — |  |  | $ | 85,169 |
|  | December 31, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 2,136 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,136 |
Corporate bonds |  |  | — |  |  |  | 7,368 |  |  |  | — |  |  |  | 7,368 |
Commercial paper |  |  | — |  |  |  | 500 |  |  |  | — |  |  |  | 500 |
Total financial assets |  | $ | 2,136 |  |  | $ | 7,868 |  |  | $ | — |  |  | $ | 10,004 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock tranche liability |  | $ | — |  |  | $ | — |  |  | $ | 1,643 |  |  | $ | 1,643 |
Redeemable convertible preferred stock warrant liability |  |  | — |  |  |  | — |  |  |  | 480 |  |  |  | 480 |
Total financial liabilities |  | $ | — |  |  | $ | — |  |  | $ | 2,123 |  |  | $ | 2,123 |
Summary of Changes in Fair Value of Company's Level 3 Financial Instruments | The following table sets forth a summary of the changes in the fair value of the Company’s Level 3 financial instruments as follows (in thousands):
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |
Redeemable Convertible Preferred Stock Tranche Liability: |  |  |  |  |  |  |  |
Beginning balance |  | $ | 1,643 |  |  | $ | — |
Issuance of Series C redeemable convertible preferred stock tranche liability |  |  | — |  |  |  | 1,017 |
Change in fair value upon revaluation |  |  | 4,194 |  |  |  | 626 |
Settlement of redeemable convertible preferred stock tranche liability due to the issuance of Series C redeemable convertible preferred stock |  |  | (5,837 | ) |  |  | — |
Ending balance |  | $ | — |  |  | $ | 1,643 |
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |
Redeemable Convertible Preferred Stock Warrant Liability: |  |  |  |  |  |  |  |
Beginning balance |  | $ | 480 |  |  | $ | 1,023 |
Change in fair value upon revaluation |  |  | 525 |  |  |  | (543 | )
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock |  |  | (1,005 | ) |  |  | — |
Ending balance |  | $ | — |  |  | $ | 480 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -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 (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: 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 + Details
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- Definition Tabular disclosure of liabilities measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + 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 (b) -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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: 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 + Details
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