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Investments in Marketable Debt Securities, Available-for-Sale | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Investments in Marketable Debt Securities, Available-for-Sale | Investments in Marketable Debt Securities, Available-for-Sale 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 for the year ended December 31, 2021 consisted of the following (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Short-term investments: |  |  |  |  |  |  |
Corporate debt security | $ | 71,406 |  |  | $ | — |  |  | $ | (57) |  |  | $ | 71,349 |
U.S. treasuries | 3,415 |  |  | — |  |  | (7) |  |  | 3,408 |
Asset-backed security and other | 2,555 |  |  | — |  |  | (4) |  |  | 2,551 |
Non-U.S. government and supranational bonds | 16,405 |  |  | 1 |  |  | (19) |  |  | 16,387 |
Certificate of deposit | 1,001 |  |  | — |  |  | — |  |  | 1,001 |
| $ | 94,782 |  |  | $ | 1 |  |  | $ | (87) |  |  | $ | 94,696 |
Long-term investments: |  |  |  |  |  |  |
Corporate debt security | $ | 42,703 |  |  | $ | — |  |  | $ | (246) |  |  | $ | 42,457 |
U.S. treasuries | 2,201 |  |  | — |  |  | (5) |  |  | 2,196 |
Asset-backed security and other | 5,438 |  |  | — |  |  | (28) |  |  | 5,410 |
Non-U.S. government and supranational bonds | 3,769 |  |  | — |  |  | (16) |  |  | 3,753 |
Certificate of deposit | 1,000 |  |  | — |  |  | — |  |  | 1,000 |
| $ | 55,111 |  |  | $ | — |  |  | $ | (295) |  |  | $ | 54,816 |
The Company’s investment in marketable debt securities, available-for-sale that have been in a continuous unrealized loss position by type of security for the year ended December 31, 2021 consisted of the following (in thousands):
| 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 | $ | 113,806 |  |  | $ | (303) |  |  | $ | — |  |  | $ | — |  |  | $ | 113,806 |  |  | $ | (303) |
US treasuries | 5,604 |  |  | (12) |  |  | — |  |  | — |  |  | 5,604 |  |  | (12) |
Asset-backed security and other | 7,961 |  |  | (32) |  |  | — |  |  | — |  |  | 7,961 |  |  | (32) |
Non-U.S. government and supranational bonds | 20,140 |  |  | (34) |  |  | — |  |  | — |  |  | 20,140 |  |  | (34) |
Certificates of deposit | 2,001 |  |  | — |  |  | — |  |  | — |  |  | 2,001 |  |  | — |
| $ | 149,512 |  |  | $ | (381) |  |  | $ | — |  |  | $ | — |  |  | $ | 149,512 |  |  | $ | (381) |
Gross realized gains and gross realized losses from the sales of the Company’s marketable debt securities, available-for-sale for the year ended December 31, 2021 consisted of the following (in thousands):
| December 31, 2021 |  | December 31, 2020
Gross realized gains | $ | — |  |  | $ | — |
Gross realized losses | $ | (1) |  |  | $ | — |
Amortized cost and fair value of marketable debt securities, available-for-sale by contractual maturity for the year ended December 31, 2021 consisted of the following (in thousands, except weighted average data):
| Amortized Cost |  | Fair Value
Due in one year or less | $ | 95 |  |  | $ | 95 |
Due after one year through five years | 55 |  |  | 55 |
| $ | 150 |  |  | $ | 150 |
Weighted average contractual maturity |  |  | 0.8 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 http://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 http://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 http://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 http://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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