The following tables show the Company’s restricted cash equivalents and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as restricted cash and cash equivalents or short- and long-term investments as of March 31, 2022. There were no restricted cash equivalents or investments as of December 31, 2021.

The Company tests for other-than-temporary losses on a quarterly basis and has considered the unrealized losses indicated above to be temporary in nature. The Company intends to hold the investments until it can recover the full principal amount and has the ability to do so based on other sources of liquidity. The Company expects such recoveries to occur prior to the contractual maturities.

The following table summarizes the estimated fair value of our investments, designated as available-for-sale and classified by the contractual maturity date of the securities as of March 31, 2022:
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As part of the merger, the Company acquired an investment totaling $250,000 in preferred shares of Kogniz, Inc., a privately owned artificial intelligence company based in Silicon Valley, CA. The Company’s investment represented less than 10% of the outstanding equity of Kogniz. The Company uses the cost method to account for investments in common stock of entities such as Kogniz if the Company does not have the ability to exercise significant influence over the operating and financial matters of the entity. The Company also uses the cost method to account for its investments that are not in the form of common stock or in-substance common stock in entities if the Company does not have the ability to exercise significant influence over the entity’s operating and financial matters.