Fair Value Measurements - Summary of Investments Classified as Available-For-Sale (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 49,266	$ 138,832
Gross Unrealized Gains	23	222
Gross Unrealized Losses	(101)	(9)
Fair Value	$ 49,188	$ 139,045
Minimum [Member]
Debt Securities, Available-for-sale [Line Items]
Remaining maturity	2 months	3 months
Maximum [Member]
Debt Securities, Available-for-sale [Line Items]
Remaining maturity	19 months	2 years
U.S. Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		$ 36,880
Gross Unrealized Gains		99
Gross Unrealized Losses		0
Fair Value		36,979
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 23,658	60,803
Gross Unrealized Gains	22	77
Gross Unrealized Losses	(101)	(2)
Fair Value	23,579	60,878
Commercial Paper [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,009	19,965
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Fair Value	20,009	19,966
Agency Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,100	12,198
Gross Unrealized Gains	1	44
Gross Unrealized Losses	0	0
Fair Value	3,101	12,242
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,499	8,986
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	(7)
Fair Value	$ 2,499	$ 8,980

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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