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Investments | 3 Months Ended
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Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Investments | Investments Amortized cost, gross unrealized gains/losses in accumulated other comprehensive loss and fair value of marketable debt securities, available-for-sale, by type of security as of March 31, 2023 and December 31, 2022 consisted of the following (in thousands):
| March 31, 2023
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Short-term investments: |  |  |  |  |  |  |
Corporate debt security | $ | 24,185 |  |  | $ | — |  |  | $ | (303) |  |  | $ | 23,882 |
U.S. treasuries | 651 |  |  | — |  |  | (1) |  |  | 650 |
Asset-backed security and other | 3,029 |  |  | — |  |  | (33) |  |  | 2,996 |
| $ | 27,865 |  |  | $ | — |  |  | $ | (337) |  |  | $ | 27,528 |
| December 31, 2022
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Short-term investments: |  |  |  |  |  |  |
Corporate debt security | $ | 40,177 |  |  | $ | — |  |  | $ | (612) |  |  | $ | 39,565 |
U.S. treasuries | 2,201 |  |  | — |  |  | (21) |  |  | 2,180 |
Asset-backed security and other | 5,324 |  |  | — |  |  | (76) |  |  | 5,248 |
Non-U.S. government and supranational bonds | 3,685 |  |  | — |  |  | (30) |  |  | 3,655 |
| $ | 51,387 |  |  | $ | — |  |  | $ | (739) |  |  | $ | 50,648 |
As of March 31, 2023, no allowance for credit losses was recorded related to an impairment of available-for-sale securities. The Company’s investments in marketable debt securities, available-for-sale that have been in a continuous unrealized loss position by type of security as of March 31, 2023 and December 31, 2022 consisted of the following (in thousands):
| March 31, 2023
| Less than 12 months |  | 12 months or greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Corporate debt security | $ | 405 |  |  | $ | — |  |  | $ | 23,477 |  |  | $ | (303) |  |  | $ | 23,882 |  |  | $ | (303) |
U.S. treasuries | — |  |  | — |  |  | 650 |  |  | (1) |  |  | 650 |  |  | (1) |
Asset-backed security and other | — |  |  | — |  |  | 2,996 |  |  | (33) |  |  | 2,996 |  |  | (33) |
| $ | 405 |  |  | $ | — |  |  | $ | 27,123 |  |  | $ | (337) |  |  | $ | 27,528 |  |  | $ | (337) |
| December 31, 2022
| Less than 12 months |  | 12 months or greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Corporate debt security | $ | 1,790 |  |  | $ | (2) |  |  | $ | 37,775 |  |  | $ | (610) |  |  | $ | 39,565 |  |  | $ | (612) |
U.S. treasuries | — |  |  | — |  |  | 2,180 |  |  | (21) |  |  | 2,180 |  |  | (21) |
Asset-backed security and other | — |  |  | — |  |  | 5,248 |  |  | (76) |  |  | 5,248 |  |  | (76) |
Non-U.S. government and supranational bonds | — |  |  | — |  |  | 3,655 |  |  | (30) |  |  | 3,655 |  |  | (30) |
| $ | 1,790 |  |  | $ | (2) |  |  | $ | 48,858 |  |  | $ | (737) |  |  | $ | 50,648 |  |  | $ | (739) |
Gross realized gains and gross realized losses from the sales of the Company’s marketable debt securities, available-for-sale for the three months ended March 31, 2023 and 2022 consisted of the following (in thousands):
| Three Months Ended March 31,
| 2023 |  | 2022
Gross realized gains | $ | — |  |  | $ | — |
Gross realized losses | $ | (91) |  |  | $ | (6) |
Amortized cost and fair value of marketable debt securities, available-for-sale by contractual maturity as of March 31, 2023 consisted of the following (in thousands, except weighted average data):
| Amortized Cost |  | Fair Value
Due in one year or less | $ | 27,865 |  |  | $ | 27,528 |
Weighted average contractual maturity |  |  | 0.3 years
Amortized cost and fair value of marketable debt securities, available-for-sale by contractual maturity as of December 31, 2022 consisted of the following (in thousands, except weighted average data):
| Amortized Cost |  | Fair Value
Due in one year or less | $ | 51,387 |  |  | $ | 50,648 |
Weighted average contractual maturity |  |  | 0.3 years
Actual maturities may differ from contractual maturities because certain issuers may have the right or obligation to prepay certain obligations with or without penalties.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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