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Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,079,862	$ 318,729
Gross unrealized gains	91	106
Gross unrealized losses	(63)	(21)
Fair value	1,079,890	318,814
Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	425,389	81,612
Gross unrealized gains
Gross unrealized losses	(1)	(1)
Fair value	425,388	81,611
Cash and money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	364,020	43,040
Gross unrealized gains
Gross unrealized losses
Fair value	364,020	43,040
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	61,369	32,538
Gross unrealized gains
Gross unrealized losses	(1)	(1)
Fair value	61,368	32,537
U.S. government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost		170
Gross unrealized gains
Gross unrealized losses
Fair value		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	654,473	237,117
Gross unrealized gains	91	106
Gross unrealized losses	(62)	(20)
Fair value	654,502	237,203
Commercial paper, not included with cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	255,817	112,648
Gross unrealized gains	8	4
Gross unrealized losses	(8)	(8)
Fair value	255,817	112,644
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	13,564	17,360
Gross unrealized gains	31	96
Gross unrealized losses
Fair value	13,595	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	385,092	107,109
Gross unrealized gains	52	6
Gross unrealized losses	(54)	(12)
Fair value	385,090	107,103
Short-Term Restricted Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	500	836
Gross unrealized gains
Gross unrealized losses
Fair value	500	836
Long-term restricted cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	4,560	3,500
Gross unrealized gains
Gross unrealized losses
Fair value	$ 4,560	$ 3,500

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