The Company’s portfolio of available-for-sale securities consists of high credit quality corporate debt securities as of December 31, 2021. The following is a summary of the Company’s available-for-sale securities as of December 31, 2021 and 2020:

	December 31, 2021
			Gross		Gross		Fair Value
	Amortized		Unrealized		Unrealized		(Net Carrying
	Cost		Gains		Losses		Amount)
Corporate debt securities		12,343,456		—		—		12,343,456
Total available-for-sale securities	$	12,343,456	$	—	$	—	$	12,343,456

	December 31, 2020
			Gross		Gross		Fair Value
	Amortized		Unrealized		Unrealized		(Net Carrying
	Cost		Gains		Losses		Amount)
Corporate debt securities		6,298,075		—		—		6,298,075
Total available-for-sale securities	$	6,298,075	$	—	$	—	$	6,298,075

There were no gross unrealized losses relating to the Company’s available-for-sale securities investments as of December 31, 2021. The net adjustment to unrealized holding gains on short-term investments, net of tax in other comprehensive income were immaterial for each of the years ended December 31, 2021 and 2020.

Contractual maturities of debt investment securities as of December 31, 2021 are shown below. Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.

	Under
	1 Year		1 to 2 Years		Total
Corporate debt securities		12,343,456		—		12,343,456
Total available-for-sale securities	$	12,343,456	$	—	$	12,343,456

The Company conducts a regular assessment of its debt securities with unrealized losses to determine whether securities have OTTI considering, among other factors, the nature of the securities, credit rating or financial condition of the issuer, the extent and duration of the unrealized loss, expected cash flows of underlying collateral, market conditions and whether the Company intends to sell or it is more likely than not that the Company will be required to sell the debt securities. As the Company did not have any unrealized losses as of December 31, 2021, there was no OTTI of its available-for-sale securities as of that date.