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Investment Securities and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Schedule of Available-for-sale Securities | Investment securities classified as available-for-sale consisted of the following at December 31, 2020 and 2019 (in thousands):
| 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 |
| December 31, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate bonds | $ | 9,597 |  |  | $ | 18 |  |  | $ | (1) |  |  | $ | 9,614 |
Agency securities | 11,101 |  |  | 17 |  |  | — |  |  | 11,118 |
Treasury securities | 14,222 |  |  | 12 |  |  | (1) |  |  | 14,233 |
Total available-for-sale investment securities | $ | 34,920 |  |  | $ | 47 |  |  | $ | (2) |  |  | $ | 34,965 |
Available-for-sale Investments, by Remaining Contract Maturity | At December 31, 2020 and 2019, the contractual maturities of our investments did not exceed 36 months. The fair values of available-for-sale investments, by remaining contractual maturity, are as follows (in thousands):
| December 31, 2020 |  | December 31, 2019
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 28,197 |  |  | $ | 28,256 |  |  | $ | 22,846 |  |  | $ | 22,876 |
Due after one year through three years | 6,754 |  |  | 6,770 |  |  | 12,074 |  |  | 12,089 |
Total available-for-sale investment securities | $ | 34,951 |  |  | $ | 35,026 |  |  | $ | 34,920 |  |  | $ | 34,965 |
Schedule of Sales and Maturities | During the years ended December 31, 2020 and 2019, we had sales and maturities (which include calls) of investment securities, as follows (in thousands):
| Year Ended December 31, 2020
| Gross Realized Gains |  | Gross Realized Losses |  | Gross Proceeds from Sales |  | Gross Proceeds from Maturities
Corporate bonds | $ | 6 |  |  | $ | — |  |  | $ | 4,006 |  |  | $ | 5,600 |
Agency securities | 25 |  |  | — |  |  | 7,878 |  |  | 1,900 |
Treasury securities | 4 |  |  | (2) |  |  | 4,827 |  |  | 19,830 |
| $ | 35 |  |  | $ | (2) |  |  | $ | 16,711 |  |  | $ | 27,330 |
| Year Ended December 31, 2019
| Gross Realized Gains |  | Gross Realized Losses |  | Gross Proceeds from Sales |  | Gross Proceeds from Maturities
Corporate bonds | $ | — |  |  | $ | (1) |  |  | $ | 2,750 |  |  | $ | 11,350 |
Agency securities | 6 |  |  | — |  |  | — |  |  | 3,625 |
Treasury securities | — |  |  | — |  |  | — |  |  | 685 |
| $ | 6 |  |  | $ | (1) |  |  | $ | 2,750 |  |  | $ | 15,660 |
Fair Value, Assets Measured on Recurring Basis | The following tables present our financial assets and liabilities measured at fair value on a recurring basis at December 31, 2020 and 2019, by level within the fair value hierarchy (in thousands):
| 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 |
| December 31, 2019
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 337 |  |  | $ | — |  |  | $ | — |  |  | $ | 337 |
Available-for-sale investment securities: |  |  |  |  |  |  |
Corporate bonds | — |  |  | 9,614 |  |  | — |  |  | 9,614 |
Agency securities | — |  |  | 11,118 |  |  | — |  |  | 11,118 |
Treasury securities | 14,233 |  |  | — |  |  | — |  |  | 14,233 |
Total | $ | 14,570 |  |  | $ | 20,732 |  |  | $ | — |  |  | $ | 35,302 |
Fair Value, Liabilities Measured on Recurring Basis | The following tables present our financial assets and liabilities measured at fair value on a recurring basis at December 31, 2020 and 2019, by level within the fair value hierarchy (in thousands):
| 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 |
| December 31, 2019
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 337 |  |  | $ | — |  |  | $ | — |  |  | $ | 337 |
Available-for-sale investment securities: |  |  |  |  |  |  |
Corporate bonds | — |  |  | 9,614 |  |  | — |  |  | 9,614 |
Agency securities | — |  |  | 11,118 |  |  | — |  |  | 11,118 |
Treasury securities | 14,233 |  |  | — |  |  | — |  |  | 14,233 |
Total | $ | 14,570 |  |  | $ | 20,732 |  |  | $ | — |  |  | $ | 35,302 |

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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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- Definition Tabular disclosure of liabilities, 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). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + 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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