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Cash, Cash Equivalents and Short-Term Investments - Contractual Maturities (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Cash, Cash Equivalents and Short-Term Investments    
Due within one year, Amortized Cost $ 75,078,000 $ 14,084
Due between one and two years, Amortized Cost 155,062,000 9,095
Total, Amortized Cost 230,140,000 23,179
Due within one year, Fair Value 75,135,000 14,111
Due between one and two years, Fair Value 153,996,000 9,198
Total, Fair Value $ 229,131,000 $ 23,309