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Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2020

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):

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
														$	81,897

December 31, 2019		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
Money market funds (cash equivalents)		$	15,369			$	—			$	—			$	15,369
U.S. government agency securities			51,467				23				—				51,490
Federal agency securities			9,995				11				—				10,006
Total financial assets		$	76,831			$	34			$	—			$	76,865
Classified as:
Cash and cash equivalents														$	15,369
Short-term investments															61,496
														$	76,865

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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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No definition available.

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