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Fair Value Measurements - Summary of Investments Classified as Available-For-Sale (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 91,957	$ 138,832
Gross Unrealized Gains	72	222
Gross Unrealized Losses	(7)	(9)
Fair Value	$ 92,022	$ 139,045
Minimum
Debt Securities, Available-for-sale [Line Items]
Remaining maturity	1 month	3 months
Maximum
Debt Securities, Available-for-sale [Line Items]
Remaining maturity	19 months	2 years
U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 32,984	$ 36,880
Gross Unrealized Gains	3	99
Gross Unrealized Losses	0	0
Fair Value	32,987	36,979
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	32,252	19,965
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Fair Value	32,252	19,966
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,287	60,803
Gross Unrealized Gains	69	77
Gross Unrealized Losses	(7)	(2)
Fair Value	20,349	60,878
Agency bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,998	12,198
Gross Unrealized Gains	0	44
Gross Unrealized Losses	0	0
Fair Value	3,998	12,242
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,436	8,986
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	(7)
Fair Value	$ 2,436	$ 8,980

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