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Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,144,379	$ 318,729
Gross unrealized gains	104	106
Gross unrealized losses	(110)	(21)
Fair value	1,144,373	318,814
Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	459,801	81,612
Gross unrealized gains
Gross unrealized losses	(7)	(1)
Fair value	459,794	81,611
Cash and money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	263,433	43,040
Gross unrealized gains
Gross unrealized losses
Fair value	263,433	43,040
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	193,092	32,538
Gross unrealized gains
Gross unrealized losses	(7)	(1)
Fair value	193,085	32,537
U.S. government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,276	170
Gross unrealized gains
Gross unrealized losses
Fair value	3,276	170
U.S. Treasury security [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost		5,864
Gross unrealized gains
Gross unrealized losses
Fair value		5,864
Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	684,578	237,117
Gross unrealized gains	104	106
Gross unrealized losses	(103)	(20)
Fair value	684,579	237,203
Commercial paper, not included with cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	173,929	112,648
Gross unrealized gains	23	4
Gross unrealized losses	(6)	(8)
Fair value	173,946	112,644
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	13,629	17,360
Gross unrealized gains	52	96
Gross unrealized losses
Fair value	13,681	17,456
U.S. government & agency securities, not included with cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	497,020	107,109
Gross unrealized gains	29	6
Gross unrealized losses	(97)	(12)
Fair value	496,952	107,103
Short-Term Restricted Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	300	836
Gross unrealized gains
Gross unrealized losses
Fair value	300	836
Long-term restricted cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,000	3,500
Gross unrealized gains
Gross unrealized losses
Fair value	$ 3,000	$ 3,500

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