Short-Term and Long-Term Investments (Tables)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Summary of Investment

Details of our investments are as follows (in thousands):

	March 31, 2022
	Cash and Cash Equivalents		Short-Term Investments		Long-Term Investment
Measured at fair value:
Available-for-sale debt securities:
Money market funds	$	119,506	$	—	$	—
U.S. Treasury Obligations		—		20,003		—
Failed Auction Security		—		—		2,536
Total		119,506		20,003		2,536
Other measurement basis:
Cash on hand		71,544		—		—
Total	$	191,050	$	20,003	$	2,536

	December 31, 2021
	Cash and Cash Equivalents		Short-Term Investments		Long-Term Investment
Measured at fair value:
Available-for-sale debt securities:
Money market funds	$	94,282	$	—	$	—
U.S. Treasury Obligations		—		45,215		—
Failed Auction Security		—		—		2,639
Total		94,282		45,215		2,639
Other measurement basis:
Cash on hand		88,136		—		—
Total	$	182,418	$	45,215	$	2,639

Summary of Available-for-Sale Securities

The following is a summary of the available-for-sale securities (in thousands):

March 31, 2022	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. Treasury Obligations	$	20,137	$	—	$	134	$	20,003
Failed Auction Security		3,000		—		464		2,536

December 31, 2021	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. Treasury Obligations	$	45,238	$	—	$	23	$	45,215
Failed Auction Security		3,000		—		361		2,639

Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturities

The amortized cost and estimated fair value of the available-for-sale securities on March 31, 2022, by type and contractual maturities, are shown below (in thousands):

	Cost		Estimated Fair Value
U.S. Treasury Obligations:
Maturities greater than three months but less than one year	$	20,137	$	20,003

	Cost		Estimated Fair Value
Failed Auction Security:
Due in twenty to forty years	$	3,000	$	2,536