Investments - Summary of Short term Investments (Details) $ in Thousands	1 Months Ended
	Jul. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) investment
Investments, Debt and Equity Securities [Abstract]
Number of held-to-maturity investments held | investment		1
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		$ 642,206
Gross Unrealized Gains		487
Gross Unrealized Losses		(47)
Total Fair Value		642,646
Within 1 year, Amortized Cost		608,074
After 1 year through 5 years, Amortized Cost		31,691
After 5 years through 10 Years, Amortized Cost		2,441
Within 1 year, Fair Value		608,470
After 1 year through 5 years, Fair Value		31,739
After 5 years through 10 years, Fair Value		2,437
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		305,809
Gross Unrealized Gains		432
Gross Unrealized Losses		(44)
Total Fair Value		306,197
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		42,550
Gross Unrealized Gains		62
Gross Unrealized Losses		(9)
Total Fair Value		42,603
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		12,989
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		12,989
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		43,245
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		43,245
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		114,901
Gross Unrealized Gains		332
Gross Unrealized Losses		(27)
Total Fair Value		115,206
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		16,248
Gross Unrealized Gains		13
Gross Unrealized Losses		(6)
Total Fair Value		16,255
U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		35,457
Gross Unrealized Gains		15
Gross Unrealized Losses		(2)
Total Fair Value		35,470
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		40,019
Gross Unrealized Gains		10
Gross Unrealized Losses		0
Total Fair Value		40,029
Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		400
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		400
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		336,397
Gross Unrealized Gains		55
Gross Unrealized Losses		(3)
Total Fair Value		336,449
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		1,283
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		1,283
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		2,020
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		2,020
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		12,994
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		12,994
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		13,914
Gross Unrealized Gains		55
Gross Unrealized Losses		(3)
Total Fair Value		13,966
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		293,308
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		293,308
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		7,178
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		7,178
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		5,700
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		5,700
Level 1
Debt Securities, Available-for-sale [Line Items]
Total		354,046
Level 1 | Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		53,018
Level 1 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		12,989
Level 1 | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		40,029
Level 1 | Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		301,028
Level 1 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		2,020
Level 1 | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | Money market funds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		293,308
Level 1 | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		5,700
Level 2
Debt Securities, Available-for-sale [Line Items]
Total		288,600
Level 2 | Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		253,179
Level 2 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		42,603
Level 2 | Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 2 | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		43,245
Level 2 | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		115,206
Level 2 | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		16,255
Level 2 | U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		35,470
Level 2 | U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 2 | Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		400
Level 2 | Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		35,421
Level 2 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		1,283
Level 2 | Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 2 | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		12,994
Level 2 | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		13,966
Level 2 | Money market funds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 2 | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		7,178
Level 2 | U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		$ 0
Subsequent Event
Debt Securities, Available-for-sale [Line Items]
Increase in available-for-sale debt investments	$ 60,000