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Cash and Cash Equivalents, and Investments - Schedule of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Cost	$ 836,953
Fair Value	837,722
Cash and cash equivalents:
Schedule Of Available For Sale Securities [Line Items]
Cost	387,520	$ 374,664
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	387,520	374,664
Short-term investments:
Schedule Of Available For Sale Securities [Line Items]
Cost	380,686	93,449
Unrealized Gain	470	0
Unrealized Loss	(82)	(104)
Fair Value	381,074	93,345
Long-term investments
Schedule Of Available For Sale Securities [Line Items]
Cost	310,102	16,059
Unrealized Gain	539	9
Unrealized Loss	(158)	(16)
Fair Value	310,483	16,052
Cash | Cash and cash equivalents:
Schedule Of Available For Sale Securities [Line Items]
Cost	241,355	351,345
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	241,355	351,345
Money market funds | Cash and cash equivalents:
Schedule Of Available For Sale Securities [Line Items]
Cost	146,165	5,052
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	146,165	5,052
Commercial paper | Cash and cash equivalents:
Schedule Of Available For Sale Securities [Line Items]
Cost		18,267
Unrealized Gain		0
Unrealized Loss		0
Fair Value		18,267
Commercial paper | Short-term investments:
Schedule Of Available For Sale Securities [Line Items]
Cost	7,489	40,500
Unrealized Gain	0	0
Unrealized Loss	0	(12)
Fair Value	7,489	40,488
Corporate securities | Short-term investments:
Schedule Of Available For Sale Securities [Line Items]
Cost	318,946	38,616
Unrealized Gain	425	0
Unrealized Loss	(78)	(87)
Fair Value	319,293	38,529
Corporate securities | Long-term investments
Schedule Of Available For Sale Securities [Line Items]
Cost	295,103	14,429
Unrealized Gain	533	9
Unrealized Loss	(158)	(14)
Fair Value	295,478	14,424
U.S. treasury securities | Short-term investments:
Schedule Of Available For Sale Securities [Line Items]
Cost	44,251	14,333
Unrealized Gain	39	0
Unrealized Loss	(4)	(5)
Fair Value	44,286	14,328
U.S. treasury securities | Long-term investments
Schedule Of Available For Sale Securities [Line Items]
Cost		1,630
Unrealized Gain		0
Unrealized Loss		(2)
Fair Value		$ 1,628
Agency Securities | Short-term investments:
Schedule Of Available For Sale Securities [Line Items]
Cost	10,000
Unrealized Gain	6
Unrealized Loss	0
Fair Value	10,006
Agency Securities | Long-term investments
Schedule Of Available For Sale Securities [Line Items]
Cost	14,999
Unrealized Gain	6
Unrealized Loss	0
Fair Value	$ 15,005

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