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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following tables present the fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of December 31, 2019 and 2018 (in thousands):
|  | December 31, 2019 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 15,369 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,369 |
U.S. government agency securities(2) |  |  | 51,490 |  |  |  | — |  |  |  | — |  |  |  | 51,490 |
Federal agency securities(2) |  |  | — |  |  |  | 10,006 |  |  |  | — |  |  |  | 10,006 |
Total financial assets |  | $ | 66,859 |  |  | $ | 10,006 |  |  | $ | — |  |  | $ | 76,865 |
(1) | Included in cash and cash equivalents on accompanying consolidated balance sheet.
(2) | Included in short-term investments on accompanying consolidated balance sheet and are classified as available-for-sale debt securities.
|  | December 31, 2018 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 29,090 |  |  | $ | — |  |  | $ | — |  |  | $ | 29,090 |
Federal agency securities(1) |  |  | — |  |  |  | 999 |  |  |  | — |  |  |  | 999 |
Restricted cash (2) |  |  | 50 |  |  |  | — |  |  |  | — |  |  |  | 50 |
U.S. government agency securities(3) |  |  | 74,139 |  |  |  | — |  |  |  | — |  |  |  | 74,139 |
Federal agency securities(3) |  |  | — |  |  |  | 14,775 |  |  |  | — |  |  |  | 14,775 |
Total financial assets |  | $ | 103,279 |  |  | $ | 15,774 |  |  | $ | — |  |  | $ | 119,053 |
(1) | Included in cash and cash equivalents on accompanying consolidated balance sheet.
(2) | $0.05 million of restricted cash serves as collateral for the Company’s corporate credit card.
(3) | Included in short-term investments on accompanying consolidated balance sheet and are classified as available-for-sale debt securities.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 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=117815213&loc=d3e19207-110258 + Details
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