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Cash Equivalents and Investments - Schedule of Fair Value of Short-term and Long-term Marketable Securities Classified by Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Marketable Securities [Abstract]    
Due within one year $ 306,412 $ 133,986
Due after one year through three years 0 8,030
Total cash equivalents and available-for-sale investments $ 306,412 $ 142,016