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Short-term Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Interest receivable	$ 600	$ 500
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	259,183	258,290
Unrealized Gains	7	15
Unrealized Losses	(5)	(1)
Fair Value	259,185	258,304
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	125,378	79,387
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	125,378	79,387
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49,123	59,382
Unrealized Gains	7	7
Unrealized Losses	0	0
Fair Value	49,130	59,389
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	57,067	68,018
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	57,067	68,018
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	27,615	48,494
Unrealized Gains	0	8
Unrealized Losses	(5)	(1)
Fair Value	27,610	48,501
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		3,009
Unrealized Gains		0
Unrealized Losses		0
Fair Value		3,009
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	125,378	79,387
Cash equivalents | Money market funds
Debt Securities, Available-for-sale [Line Items]
Fair Value	125,378	79,387
Cash equivalents | U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Cash equivalents | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Cash equivalents | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Cash equivalents | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value		0
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	133,807	178,917
Short-term Investments | Money market funds
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Short-term Investments | U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Fair Value	49,130	59,389
Short-term Investments | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Fair Value	57,067	68,018
Short-term Investments | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 27,610	48,501
Short-term Investments | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value		$ 3,009

X

- Definition

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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