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Investment Securities and Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of Available-for-sale Securities | Investment securities classified as available-for-sale consisted of the following as of June 30, 2021 and December 31, 2020 (in thousands):
| June 30, 2021
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate bonds | $ | 49,442 |  |  | $ | 4 |  |  | $ | (7) |  |  | $ | 49,439 |
Agency securities | 11,842 |  |  | 13 |  |  | (7) |  |  | 11,848 |
Treasury securities | 53,225 |  |  | 18 |  |  | (11) |  |  | 53,232 |
Total available-for-sale investment securities | $ | 114,509 |  |  | $ | 35 |  |  | $ | (25) |  |  | $ | 114,519 |
| December 31, 2020
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Agency securities | $ | 17,104 |  |  | $ | 29 |  |  | $ | (1) |  |  | $ | 17,132 |
Treasury securities | 17,847 |  |  | 47 |  |  | — |  |  | 17,894 |
Total available-for-sale investment securities | $ | 34,951 |  |  | $ | 76 |  |  | $ | (1) |  |  | $ | 35,026 |
Available-for-sale Investments, by Remaining Contract Maturity | The fair values of available-for-sale investment securities, by remaining contractual maturity, are as follows (in thousands):
| June 30, 2021 |  | December 31, 2020
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 102,950 |  |  | $ | 102,978 |  |  | $ | 28,197 |  |  | $ | 28,256 |
Due after one year through three years | 11,559 |  |  | 11,541 |  |  | 6,754 |  |  | 6,770 |
Total available-for-sale investment securities | $ | 114,509 |  |  | $ | 114,519 |  |  | $ | 34,951 |  |  | $ | 35,026 |
Schedule of Sales, Calls, and Maturities | During the six months ended June 30, 2021 and 2020, we had sales and maturities (which include calls) of investment securities, as follows (in thousands):
| Six Months Ended June 30, 2021
| Gross Realized Gains |  | Gross Realized Losses |  | Gross Proceeds from Sales |  | Gross Proceeds from Maturities
Agency securities | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 5,250 |
Treasury securities | 6 |  |  | — |  |  | 42,198 |  |  | 21,500 |
Total | $ | 6 |  |  | $ | — |  |  | $ | 42,198 |  |  | $ | 26,750 |
| Six Months Ended June 30, 2020
| Gross Realized Gains |  | Gross Realized Losses |  | Gross Proceeds from Sales |  | Gross Proceeds from Maturities
Corporate bonds | $ | 5 |  |  | $ | — |  |  | $ | 4,006 |  |  | $ | 4,000 |
Agency securities | 24 |  |  | — |  |  | 7,878 |  |  | 1,250 |
Treasury securities | 4 |  |  | — |  |  | 2,058 |  |  | 2,500 |
Total | $ | 33 |  |  | $ | — |  |  | $ | 13,942 |  |  | $ | 7,750 |
Fair Value, Assets Measured on Recurring Basis | The following tables summarize our financial assets measured at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 by level within the fair value hierarchy (in thousands):
| June 30, 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 5,030 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,030 |
Treasury securities | 9,500 |  |  | — |  |  | — |  |  | 9,500 |
Commercial paper | — |  |  | 3,000 |  |  | — |  |  | 3,000 |
Available-for-sale investment securities: |  |  |  |  |  |  |
Corporate bonds | — |  |  | 49,439 |  |  | — |  |  | 49,439 |
Agency securities | — |  |  | 11,848 |  |  | — |  |  | 11,848 |
Treasury securities | 53,232 |  |  | — |  |  | — |  |  | 53,232 |
Total | $ | 67,762 |  |  | $ | 64,287 |  |  | $ | — |  |  | $ | 132,049 |
| December 31, 2020
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 4,749 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,749 |
Treasury securities | 97,433 |  |  | — |  |  | — |  |  | 97,433 |
Available-for-sale investment securities: |  |  |  |  |  |  |
Agency securities | — |  |  | 17,132 |  |  | — |  |  | 17,132 |
Treasury securities | 17,894 |  |  | — |  |  | — |  |  | 17,894 |
Total | $ | 120,076 |  |  | $ | 17,132 |  |  | $ | — |  |  | $ | 137,208 |

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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=123874694&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=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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