Investments - Summary of Short term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 336,551	$ 275,801
Gross Unrealized Gains	17	48
Gross Unrealized Losses	(50)	(23)
Total Fair Value	336,518	275,826
Within 1 year, Amortized Cost	300,667
After 1 year through 5 years, Amortized Cost	33,584
After 5 years through 10 Years, Amortized Cost	798
After 10 Years, Amortized Cost	1,502
Within 1 year, Fair Value	300,653
After 1 year through 5 years, Fair Value	33,565
After 5 years through 10 years, Fair Value	798
After 10 Years, Fair Value	1,502
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	156,095	129,098
Gross Unrealized Gains	17	48
Gross Unrealized Losses	(48)	(23)
Total Fair Value	156,064	129,123
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21,757	19,111
Gross Unrealized Gains	5	18
Gross Unrealized Losses	(4)	(9)
Total Fair Value	21,758	19,120
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,797	5,046
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	15,797	5,046
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,004	15,148
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	19,004	15,148
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	57,131	50,771
Gross Unrealized Gains	1	16
Gross Unrealized Losses	(40)	(12)
Total Fair Value	57,092	50,775
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	26,589	12,702
Gross Unrealized Gains	10	8
Gross Unrealized Losses	(3)	(2)
Total Fair Value	26,596	12,708
U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		8,415
Gross Unrealized Gains		3
Gross Unrealized Losses		0
Total Fair Value		8,418
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,067	17,605
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(1)	0
Total Fair Value	15,067	17,608
Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	750	300
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	750	300
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	180,456	146,703
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	0
Total Fair Value	180,454	146,703
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	247
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Total Fair Value	247
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,804	976
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	1,804	976
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,648	5,293
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	13,648	5,293
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,238	1,744
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	0
Total Fair Value	9,236	1,744
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	152,244	138,290
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	152,244	138,290
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,275	400
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	3,275	400
Level 1
Debt Securities, Available-for-sale [Line Items]
Total	184,912	161,920
Level 1 \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	30,864	22,654
Level 1 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	15,797	5,046
Level 1 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	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	15,067	17,608
Level 1 \| Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 \| Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	154,048	139,266
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	1,804	976
Level 1 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	152,244	138,290
Level 1 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 2
Debt Securities, Available-for-sale [Line Items]
Total	151,606	113,906
Level 2 \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	125,200	106,469
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	21,758	19,120
Level 2 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 2 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	19,004	15,148
Level 2 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	57,092	50,775
Level 2 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	26,596	12,708
Level 2 \| U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		8,418
Level 2 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 2 \| Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	750	300
Level 2 \| Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	26,406	7,437
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	247
Level 2 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 2 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	13,648	5,293
Level 2 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	9,236	1,744
Level 2 \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 2 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	$ 3,275	$ 400

Cash and Cash Equivalents and Debt Securities, Available-for-sale, Fair Value Disclosure

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