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Investments in Marketable Debt Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Cost, Allowance for Credit Losses, Gross Unrealized Gains/Losses in Accumulated Other Comprehensive Income/Loss and Fair Value of Marketable Securities, Available-for-Sale, by Type of Security | Amortized cost, allowance for credit losses, gross unrealized gains/losses in accumulated other comprehensive income/loss and fair value of marketable debt securities, available-for-sale, by type of security consisted of the following (in thousands):
|  | March 31, 2021 |
|  | Amortized Cost |  |  | Allowance for Credit Losses |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 69,217 |  |  | $ | — |  |  | $ | 23 |  |  | $ | — |  |  | $ | 69,240 |
U.S. government sponsored entities |  |  | 11,450 |  |  |  | — |  |  |  | 4 |  |  |  | — |  |  |  | 11,454 |
Corporate debt |  |  | 53,793 |  |  |  | — |  |  |  | 7 |  |  |  | — |  |  |  | 53,800 |
|  | $ | 134,460 |  |  | $ | — |  |  | $ | 34 |  |  | $ | — |  |  | $ | 134,494 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 22,342 |  |  | $ | — |  |  | $ | 179 |  |  | $ | — |  |  | $ | 22,521 |
U.S. government sponsored entities |  |  | 1,012 |  |  |  | — |  |  |  | 36 |  |  |  | (3 | ) |  |  | 1,045 |
Corporate debt |  |  | 35,424 |  |  |  | — |  |  |  | 1,505 |  |  |  | (60 | ) |  |  | 36,869 |
Asset-backed securities (“ABS”) and other |  |  | 6,336 |  |  |  | — |  |  |  | 166 |  |  |  | (6 | ) |  |  | 6,496 |
|  | $ | 65,114 |  |  | $ | — |  |  | $ | 1,886 |  |  | $ | (69 | ) |  | $ | 66,931 |
|  | December 31, 2020 |
|  | Amortized Cost |  |  | Allowance for Credit Losses |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 75,887 |  |  | $ | — |  |  | $ | 88 |  |  | $ | (5 | ) |  | $ | 75,970 |
U.S. government sponsored entities |  |  | 32,439 |  |  |  | — |  |  |  | 8 |  |  |  | — |  |  |  | 32,447 |
Corporate debt |  |  | 49,822 |  |  |  | — |  |  |  | 20 |  |  |  | (1 | ) |  |  | 49,841 |
|  | $ | 158,148 |  |  | $ | — |  |  | $ | 116 |  |  | $ | (6 | ) |  | $ | 158,258 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 3,375 |  |  | $ | — |  |  | $ | 266 |  |  | $ | — |  |  | $ | 3,641 |
U.S. government sponsored entities |  |  | 1,114 |  |  |  | — |  |  |  | 38 |  |  |  | — |  |  |  | 1,152 |
Corporate debt |  |  | 34,183 |  |  |  | — |  |  |  | 2,137 |  |  |  | (33 | ) |  |  | 36,287 |
ABS and other |  |  | 6,509 |  |  |  | — |  |  |  | 195 |  |  |  | (11 | ) |  |  | 6,693 |
|  | $ | 45,181 |  |  | $ | — |  |  | $ | 2,636 |  |  | $ | (44 | ) |  | $ | 47,773 |
Available-for-sale Marketable Debt Securities in a Continuous Unrealized Loss Position | The Company’s investments in marketable debt securities, available-for-sale, that have been in a continuous unrealized loss position, for which an allowance for credit losses has not been recorded, by type of security consisted of the following (in thousands):
|  | March 31, 2021 |
|  | Less than 12 months |  |  | 12 months or greater |  |  | Total |
|  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S. government sponsored entities |  | $ | 139 |  |  | $ | (3 | ) |  | $ | — |  |  | $ | — |  |  | $ | 139 |  |  | $ | (3 | )
Corporate debt |  |  | 20,447 |  |  |  | (52 | ) |  |  | 139 |  |  |  | (8 | ) |  |  | 20,586 |  |  |  | (60 | )
ABS and other |  |  | 363 |  |  |  | — |  |  |  | 345 |  |  |  | (6 | ) |  |  | 708 |  |  |  | (6 | )
|  | $ | 20,949 |  |  | $ | (55 | ) |  | $ | 484 |  |  | $ | (14 | ) |  | $ | 21,433 |  |  | $ | (69 | )
10
|  | December 31, 2020 |
|  | Less than 12 months |  |  | 12 months or greater |  |  | Total |
|  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S. treasuries |  | $ | 41,702 |  |  | $ | (5 | ) |  | $ | — |  |  | $ | — |  |  | $ | 41,702 |  |  | $ | (5 | )
Corporate debt |  |  | 29,810 |  |  |  | (34 | ) |  |  | — |  |  |  | — |  |  |  | 29,810 |  |  |  | (34 | )
ABS and other |  |  | 546 |  |  |  | (6 | ) |  |  | 157 |  |  |  | (5 | ) |  |  | 703 |  |  |  | (11 | )
|  | $ | 72,058 |  |  | $ | (45 | ) |  | $ | 157 |  |  | $ | (5 | ) |  | $ | 72,215 |  |  | $ | (50 | )
Gross Realized Gains and Losses from Sale of Available for Sale Marketable Debt Securities | Gross realized gains and losses from the sales of the Company’s marketable debt securities, available-for-sale, consisted of the following (in thousands):
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Gross realized gains (1) |  | $ | 1 |  |  | $ | 53 |
Gross realized losses (1) |  | $ | — |  |  | $ | — |
(1) | Recorded in other income (expense), net in the condensed consolidated statements of net and comprehensive income. The cost basis of securities sold were determined based on the specific identification method.
Schedule of Amortized Cost and Fair Value of Marketable Debt Securities, Available-for-Sale, by Contractual Maturity | Amortized cost and fair value of marketable debt securities, available-for-sale, by contractual maturity consisted of the following (in thousands, except weighted average data):
|  | March 31, 2021 |  |  | December 31, 2020 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 134,460 |  |  | $ | 134,494 |  |  | $ | 158,148 |  |  | $ | 158,258 |
Due after one year through five years |  |  | 50,401 |  |  |  | 51,534 |  |  |  | 30,604 |  |  |  | 32,041 |
Due after five years through ten years |  |  | 10,323 |  |  |  | 10,891 |  |  |  | 10,022 |  |  |  | 11,044 |
Due after ten years |  |  | 4,390 |  |  |  | 4,506 |  |  |  | 4,555 |  |  |  | 4,688 |
|  | $ | 199,574 |  |  | $ | 201,425 |  |  | $ | 203,329 |  |  | $ | 206,031 |
Weighted average contractual maturity |  |  |  |  |  |  | 1.7 years |  |  |  |  |  |  |  | 1.6 years |

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