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Fair Value Measurements (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Fair Value Disclosures [Abstract] |  |
Schedule of assets measured at fair value on a recurring basis | The following tables summarize our assets that are measured at fair value as of June 30, 2018 and December 31, 2017 (in thousands):
Description |  | Balance as of June 30, 2018 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds |  | $ | 24,601 |  |  | $ | 24,601 |  |  | $ | — |  |  | $ | — |
Corporate debt securities (including commercial paper) |  | 21,046 |  |  | — |  |  | 21,046 |  |  | — |
U.S. government securities |  | 7,981 |  |  | — |  |  | 7,981 |  |  | — |
Total |  | $ | 53,628 |  |  | $ | 24,601 |  |  | $ | 29,027 |  |  | $ | — |
Description |  | Balance as of December 31, 2017 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds |  | $ | 15,703 |  |  | $ | 15,703 |  |  | $ | — |  |  | $ | — |
Corporate debt securities (including commercial paper) |  | 35,531 |  |  | — |  |  | 35,531 |  |  | — |
U.S. government securities |  | 15,969 |  |  | — |  |  | 15,969 |  |  | — |
Total |  | $ | 67,203 |  |  | $ | 15,703 |  |  | $ | 51,500 |  |  | $ | — |
| The following tables summarize our assets that are measured at fair value as of December 31, 2017 and 2016 (in thousands):
Description | Balance as of December 31, 2017 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Cash and money market funds | $ | 15,703 |  |  | $ | 15,703 |  |  | $ | — |  |  | $ | — |
Corporate debt securities (including commercial paper) | 35,531 |  |  | — |  |  | 35,531 |  |  | — |
U.S. government securities | 15,969 |  |  | — |  |  | 15,969 |  |  | — |
Total assets | $ | 67,203 |  |  | $ | 15,703 |  |  | $ | 51,500 |  |  | $ | — |
Description | Balance as of December 31, 2016 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Cash and money market funds | $ | 43,930 |  |  | $ | 43,930 |  |  | $ | — |  |  | $ | — |
Corporate debt securities (including commercial paper) | 48,466 |  |  | — |  |  | 48,466 |  |  | — |
U.S. government securities | 21,992 |  |  | — |  |  | 21,992 |  |  | — |
Total assets | $ | 114,388 |  |  | $ | 43,930 |  |  | $ | 70,458 |  |  | $ | — |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 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 (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 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 + Details
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