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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
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 measured at fair value on a recurring basis as of December 31, 2020 and 2019 (in thousands):
|  | 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 accompanying consolidated balance sheet.
(2) | Included in short-term investments on accompanying consolidated balance sheet and are classified as available-for-sale debt securities. $2.5 million of U.S. government agency securities are included in long-term investments on the accompanying consolidated balance sheets due to the maturity being more than 12 months.
|  | 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.
The carrying amounts of cash, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to the short-term maturity of these instruments.

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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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