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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | There were no transfers in or out of Level 1 or 2 during the periods presented. The following tables present the fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 (in thousands):
|  | June 30, 2021 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 73,621 |  |  | $ | — |  |  | $ | — |  |  | $ | 73,621 |
U.S. government agency securities(2) |  |  | 7,779 |  |  |  | — |  |  |  | — |  |  |  | 7,779 |
Federal agency securities(2) |  |  | — |  |  |  | 5,123 |  |  |  | — |  |  |  | 5,123 |
Total financial assets |  | $ | 81,400 |  |  | $ | 5,123 |  |  | $ | — |  |  | $ | 86,523 |
(1) | Included in cash and cash equivalents on the accompanying condensed consolidated balance sheets.
(2) | Included in short-term investments on the accompanying condensed consolidated balance sheets and classified as available-for-sale debt securities.
|  | December 31, 2020 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 30,360 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,360 |
U.S. government agency securities(2) |  |  | 37,837 |  |  |  | — |  |  |  | — |  |  |  | 37,837 |
Federal agency securities(2) |  |  | — |  |  |  | 13,700 |  |  |  | — |  |  |  | 13,700 |
Total financial assets |  | $ | 68,197 |  |  | $ | 13,700 |  |  | $ | — |  |  | $ | 81,897 |
(1) | Included in cash and cash equivalents on the accompanying condensed consolidated balance sheets.
(2) | Included in short-term investments on the accompanying condensed consolidated balance sheets and classified as available-for-sale debt securities. $2.5 million of U.S. government agency securities as of December 31, 2020 are included in long-term investments on the accompanying condensed consolidated balance sheets due to the maturity being more than 12 months.

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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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