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Financial Instruments
 6 Months Ended
Jun. 30, 2023
Investments, All Other Investments [Abstract]  
Financial Instruments Financial Instruments
The following table presents our financial instruments:
June 30, 2023December 31, 2022
Cash and cash equivalents$118,764 $173,857 
Available-for-sale investments29,216 55,538 
Equity investments10,000 10,000 
Total$157,980 $239,395 
Cash and cash equivalents consist primarily of money market funds with original maturity dates of three months or less, for which we determine fair value through quoted market prices.
Our available-for-sale investments primarily consist of investment grade corporate bonds, municipal bonds, and asset-backed securities with maturity dates through 2027. These investments are presented at fair value and are included in short-term investments and non-current investments in the accompanying condensed consolidated balance sheets. Unrealized gains or losses associated with the investments are included in accumulated other comprehensive loss, net of tax in the accompanying condensed consolidated balance sheets and statements of comprehensive income. For our available-for-sale investments, we do not have the intent to sell, nor is it more likely than not that we would be required to sell before recovery of their cost basis.
As of June 30, 2023, we have an accrued interest receivable balance of approximately $102,000 which is included in accounts receivable, net. We do not measure an allowance for credit losses for accrued interest receivables. We record any losses within the maturity period or at the time of sale of the investment and any write-offs to accrued interest receivables are recorded as a reduction to interest income in the period of the loss. During the three and six months ended June 30, 2023, we have recorded no credit losses for accrued interest receivables. Interest income and amortization of discounts and premiums are included in other income, net in the accompanying condensed consolidated statements of income.
The following table presents the components of our available-for-sale investments:
June 30, 2023December 31, 2022
Amortized cost$30,269 $56,670 
Unrealized gains— 16 
Unrealized losses(1,053)(1,148)
Estimated fair value$29,216 $55,538 
As of June 30, 2023, we have $19.1 million of available-for-sale debt securities with contractual maturities of one year or less and $10.1 million with contractual maturities great than one year. As of June 30, 2023, six available-for-sale debt securities with a fair value of $6.1 million have been in a loss position for one year or less and 27 securities with a fair value of $20.9 million have been in a loss position for greater than one year.
The following table presents the activity on our available-for-sale investments:
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Proceeds from sales and maturities$14,132 $17,923 $37,107 $40,595 
Realized losses on sales, net of tax(1)(48)(1)(7)
Our equity investments consist of an 18% interest in BFTR, LLC, a wholly owned subsidiary of Bison Capital Partners V L.P. BFTR, LLC is a privately held Australian company specializing in digitizing the spoken word in court and legal proceedings. The investment in common stock is carried at cost less any impairment write-downs because we do not have the ability to exercise significant influence over the investee and the securities do not have readily determinable fair values