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Marketable Securities
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
The amortized cost, gross unrealized holding gains, gross unrealized holding losses and fair value of debt securities available-for-sale by type of security at June 30, 2022 and December 31, 2021 was as follows:
Amortized CostAllowance for Credit LossesNet Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
June 30, 2022
Corporate bonds
U.S.$220,913 $— $220,913 $— $(2,589)$218,324 
Foreign30,276 — 30,276 — (411)29,865 
Government related obligations
U.S.69,830 — 69,830 — (340)69,490 
Total $321,019 $— $321,019 $— $(3,340)$317,679 
December 31, 2021
Corporate bonds
U.S.$130,388 $— $130,388 $1 $(234)$130,155 
Foreign20,643 — 20,643 — (82)20,561 
Government related obligations
U.S.41,939 — 41,939 — (8)41,931 
Total$192,971 $— $192,971 $1 $(324)$192,648 
The Company had 68 and 53 available-for-sale debt securities in an unrealized loss position, with an aggregate fair value of $317,679 and $185,296, as of June 30, 2022 and December 31, 2021, respectively. As of June 30, 2022, the Company did not intend to sell these securities, and did not believe it was more likely than not that it would be required to sell these securities prior to the anticipated recovery of their amortized cost basis. We did not have any investments in a continuous unrealized loss position for more than twelve months as of June 30, 2022 and December 31, 2021.
The net amortized cost and fair value of debt securities available-for-sale at June 30, 2022 and December 31, 2021 are shown below by contractual maturity. Actual maturities may differ from contractual maturities because securities may be restructured, called or prepaid, or the Company intends to sell a security prior to maturity. The fair values of available for sale debt securities are classified as marketable securities in the condensed consolidated balance sheets at June 30, 2022 and December 31, 2021.
June 30, 2022December 31, 2021
Net Amortized CostFair ValueNet Amortized CostFair Value
Due to mature:
Less than one year$294,150 $291,394 $155,359 $155,226 
One year through five years26,869 26,285 37,612 37,422 
Total$321,019 $317,679 $192,971 $192,648 
Net Investment Income
Sources of net investment income included in other income (expense) in the condensed consolidated statements of operations and comprehensive loss for the three and six months ended June 30, 2022 and 2021 were as follows:
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Gross investment income from debt securities available-for-sale$1,084 $89 $1,224 $161 
Investment expenses(57)(24)(75)(76)
Net investment income (excluding net realized capital gains or losses)1,027 65 1,149 85 
Net realized capital (losses) gains
(157)— (160)19 
Net investment income$870 $65 $989 $104 
We utilize the specific identification method in computing realized gains and losses. The proceeds from the sale of available-for-sale debt securities and the related gross realized capital gains and losses for the three and six months ended June 30, 2022 and 2021 were the following:
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Proceeds from sales$54,015 $— $54,015 $113,441 
Gross realized capital gains9 — 9 19 
Gross realized capital losses$166 — $166 —