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Cash and Cash Equivalents and Investments (Summary of Contractual Maturities of Cash Equivalents and Available-for-Sale Investments) (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Cash and Cash Equivalents and Investments [Abstract]  
Due in one year or less $ 102,794
Due after one year through five years 7,268
Total investments $ 110,062