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Investments and fair value measurements (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, All Other Investments [Abstract]  
Summary of Held-to-Maturity Debt Securities
The cost basis, fair values and gross unrealized gains and losses of our held-to-maturity debt securities are as follows:
December 31, 2021December 31, 2020
Amortized CostUnrealized GainsUnrealized LossesFair Value Amortized CostUnrealized GainsUnrealized LossesFair Value
Corporate debt securities (1)
$62,078 $459 $(207)$62,330 $57,651 $994 $(53)$58,592 
U.S. Treasury securities4,849 — (16)4,833 7,519 54 — 7,573 
Certificates of deposit237 — — 237 236 — — 236 
Total$67,164 $459 $(223)$67,400 $65,406 $1,048 $(53)$66,401 
_______________
(1) Includes both U.S. and foreign corporate debt securities.
Summary of Investments by Maturity Date
The following table presents certain information regarding contractual maturities of our held-to-maturity debt securities:
MaturityDecember 31, 2021
Amortized
Cost		% of
Total		Fair
Value		% of
Total
One year or less$23,316 35 %$23,381 35 %
After one year through five years43,848 65 %44,019 65 %
Total$67,164 100 %$67,400 100 %
Schedule of Unrealized Loss on Held-to-Maturity Debt Securities
Net unrealized losses on held-to-maturity debt securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position are as follows:
December 31, 2021December 31, 2020
Corporate debt securitiesU.S. Treasury securities Certificate of depositsTotalCorporate debt securitiesU.S. Treasury securities Certificate of depositsTotal
Less than 12 Months
Fair Value$18,309 $4,667 $— $22,976 $8,464 $5,181 $— $13,645 
Unrealized Losses$(192)$(16)$— $(208)$(53)$— $— $(53)
Greater than 12 months
Fair value605 — — 605 — — — — 
Unrealized losses(15)— — (15)— — — — 
Total
Fair value$18,914 $4,667 $— $23,581 $8,464 $5,181 $— $13,645 
Unrealized losses$(207)$(16)$— $(223)$(53)$— $— $(53)
Summary of Available-for-Sale Debt Securities The cost basis, fair values and gross unrealized gains and losses of our available-for-sale debt securities are as follows:
December 31, 2020
Cost
Basis		Unrealized GainsUnrealized LossesFair
Value
Corporate debt securities (1)
$7,139 $918 $— $8,057 
Total$7,139 $918 $— $8,057 
_________________
(1) Includes both U.S. and foreign corporate debt securities.
Schedule of Realized Gain (Loss) on Available-for-Sale Debt Securities
The following table reflects the composition of net realized gains or losses for the sales of the securities for each of the years shown below:
Year ended December 31,
202120202019
Realized gains (losses):
Available-for-sale debt securities:
Gains
$768 $— $— 
Losses
(90)— — 
Net
$678 $— $— 
Proceeds from sales$7,817 $— $— 
Summary of Cost and Estimated Fair Value of Equity Securities
The Company disposed of all equity securities as of December 31, 2021. The cost and estimated fair value of equity securities are as follows:
December 31, 2020
CostEstimated Fair Value
Preferred stocks$2,000 $2,119 
Total$2,000 $2,119 
Schedule of Realized Gain (Loss) on Held-to-Maturity Debt Securities and Equity Securities
The following table reflects the composition of net realized gains or losses on sales of the equity securities for each of the years shown below:
Year ended December 31,
202120202019
Realized gains (losses):
Gains$— $— $— 
Losses— — (13)
Net$— $— $(13)
Schedule of Cost and Estimated Fair Value of Mortgage Loans and Accrued Interest Receivable
The cost and estimated fair value of mortgage loans are as follows:
December 31, 2021December 31, 2020
CostEstimated Fair ValueCostEstimated Fair Value
Mortgage loans$2,022 $2,022 $2,980 $2,980 
Total$2,022 $2,022 $2,980 $2,980 
The following table reflects the composition of accrued interest receivable for investments:
Year ended December 31,
20212020
Corporate debt securities$874 $641 
Certificate of deposits— — 
U.S. Treasury securities12 45 
Accrued interest receivable on investment securities886 686 
Mortgage loans13 43 
Accrued interest receivable on investments$899 $729 
Schedule of Investment Income
Investment income from securities consists of the following:
Year ended December 31,
202120202019
Available-for-sale debt securities$773 $408 $262 
Held-to-maturity debt securities1,984 1,326 743 
Equity investments(89)146 115 
Mortgage loans168 194 325 
Other292 159 932 
Total$3,128 $2,233 $2,377 
Schedule of Fair Value Assets on a Recurring Basis
The following table summarizes the Company’s investments measured at fair value:
Assets
Corporate debt securitiesU.S. Treasury securitiesMortgage loansPreferred stocksCertificate of depositsTotal
December 31, 2021
Level 1$— $4,833 $— $— $— $4,833 
Level 262,330 — — — 237 62,567 
Level 3— — 2,022 — — 2,022 
Total$62,330 $4,833 $2,022 $— $237 $69,422 
December 31, 2020
Level 1$— $7,573 $— $2,119 $— $9,692 
Level 266,649 — — — 236 66,885 
Level 3— — 2,980 — — 2,980 
Total$66,649 $7,573 $2,980 $2,119 $236 $79,557 
Schedule of Fair Value Liabilities on a Recurring Basis The following table summarizes the Company’s liabilities measured at fair value:
Liabilities
Public WarrantsPrivate Placement WarrantsSponsor Covered SharesTotal
December 31, 2021
Level 1
$10,925 $— $— $10,925 
Level 2
— 5,542 — 5,542 
Level 3
— — 5,415 5,415 
Total
$10,925 $5,542 $5,415 $21,882 
December 31, 2020
Level 1
$— $— $— $— 
Level 2
— — — — 
Level 3
— — — — 
Total
$— $— $— $— 
Summary of the Fair Values of the Sponsor Earnout Shares Using a Monte Carlo Simulation Valuation Model The unobservable significant inputs to the valuation model were as follows:
 December 31, 2021
Current stock price$5.08 
Expected volatility55.0 %
Risk-free interest rate1.52 %
Expected term9.6 years
Expected dividend yield— %
Annual change in control probability2.0 %
Summary of Changes for Level 3 Items Measured at Fair Value
The changes for Level 3 items measured at fair value on a recurring basis using significant unobservable inputs are as follows:
Sponsor Covered Shares
Fair value as of January 1, 2021$— 
Sponsor Covered Shares assumed in Business Combination9,332 
Change in fair value of Sponsor Covered Shares(3,917)
Fair value as of December 31, 2021
$5,415