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Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2021

Investments All Other Investments [Abstract]

Cash Equivalents, Restricted Cash and Short-Term Investments Classified as Available-for-sale Securities

Cash equivalents and investments (debt securities) which are classified as available-for-sale securities, consisted of the following (in thousands):

September 30, 2021		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
Money market funds (cash equivalents)		$	59,157			$	—			$	—			$	59,157
U.S. government agency securities			2,513				1				—				2,514
Federal agency securities			2,857				—				—				2,857
Total financial assets		$	64,527			$	1			$	—			$	64,528
Classified as:
Cash and cash equivalents														$	59,157
Short-term investments															5,371
Total financial assets														$	64,528

December 31, 2020		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
Money market funds (cash equivalents)		$	30,360			$	—			$	—			$	30,360
U.S. government agency securities			37,835				2				—				37,837
Federal agency securities			13,697				3				—				13,700
Total financial assets		$	81,892			$	5			$	—			$	81,897
Classified as:
Cash and cash equivalents														$	30,360
Short-term investments															48,994
Long-term investments															2,543
Total financial assets														$	81,897

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- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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