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Fair Value of Financial Instruments (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Dec. 31, 2018
Fair Value of Financial Instruments |  |
Summary of fair value of the Company's financial assets | The following tables set forth the fair value of the Company’s financial assets by level within the fair value hierarchy (in thousands):
|  | September 30, 2019
|  | Carrying |  |  |  |  |  |  |  |  |  |  |  |
|  | Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market |  | $ | 5,465 |  | $ | 5,465 |  | $ | 5,465 |  | $ | — |  | $ | —
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  |  | 19,982 |  |  | 19,983 |  |  | — |  |  | 19,983 |  |  | —
Agency bonds |  |  | 47,178 |  |  | 47,161 |  |  | — |  |  | 47,161 |  |  | —
Corporate bonds |  |  | 107,045 |  |  | 107,003 |  |  | — |  |  | 107,003 |  |  | —
Total |  | $ | 179,670 |  | $ | 179,612 |  | $ | 5,465 |  | $ | 174,147 |  | $ | —
|  | December 31, 2018
|  | Carrying |  |  |  |  |  |  |  |  |  |  |  |
|  | Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market |  | $ | 5,000 |  | $ | 5,000 |  | $ | 5,000 |  |  | — |  |  | —
| The following table sets forth the fair value of the Company’s financial assets by level within the fair value hierarchy (in thousands):
|  | As of December 31, 2018
|  |  |  |  |  |  |  | Fair Value Measurement Based on
|  |  |  |  |  |  |  |  |  |  | Significant |  |  |
|  |  |  |  |  |  |  | Quoted Prices in |  | Other |  | Significant
|  | Carrying |  | Fair |  | Active Markets |  | Observable |  | Unobservable
Assets |  | Amount |  | Value |  | (Level 1) |  | Inputs (Level 2) |  | Inputs (Level 3)
Money market funds (cash equivalents) |  | $ | 5,000 |  | $ | 5,000 |  | $ | 5,000 |  | $ | — |  | $ | —
|  | As of December 31, 2017
|  |  |  |  |  |  |  | Fair Value Measurement Based on
|  |  |  |  |  |  |  |  |  |  | Significant |  |  |
|  |  |  |  |  |  |  | Quoted Prices in |  | Other |  | Significant
|  | Carrying |  | Fair |  | Active Markets |  | Observable |  | Unobservable
Assets |  | Amount |  | Value |  | (Level 1) |  | Inputs (Level 2) |  | Inputs (Level 3)
Money market funds (cash equivalents) |  | $ | 1,000 |  | $ | 1,000 |  | $ | 1,000 |  | $ | — |  | $ | —

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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