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Cash, Cash Equivalents and Short-Term Investments - Schedule of Securities Classified as Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	$ 91,009	$ 181,133	$ 92,673	$ 78,768
Cash and cash equivalents, Amortized Cost		181,130
Cash and cash equivalents, Gross Unrealized Gains		3
Cash and cash equivalents, Fair Value	91,009	181,133
Short-term investments, Amortized Cost	94,398	66,362
Short-term investments, Gross Unrealized Gains	94	20
Short-term investments, Gross Unrealized Losses	(4)	(3)
Short-term investments, Fair Value	94,488	66,379
Cash equivalents and short-term investments, Amortized Cost	185,407	247,492
Cash equivalents and short-term investments, Gross Unrealized Gains	94	23
Cash equivalents and short-term investments, Gross Unrealized Losses	(4)	(3)
Cash equivalents and short-term investments, Fair Value	185,497	247,512
Money Market Funds [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	83,011	147,208
Cash and cash equivalents, Fair Value	83,011	147,208
Commercial Paper (Cash Equivalents) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	6,499	19,357
Cash and cash equivalents, Gross Unrealized Gains		3
Cash and cash equivalents, Fair Value	6,499	19,360
Corporate Bonds (Investments) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost		11,441
Cash and cash equivalents, Fair Value		11,441
Cash [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	1,499	3,124
Cash and cash equivalents, Fair Value	1,499	3,124
Commercial Paper (Investments) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	41,625	36,667
Short-term investments, Gross Unrealized Gains	30	14
Short-term investments, Gross Unrealized Losses	(1)
Short-term investments, Fair Value	41,654	36,681
Corporate Bonds (Investments) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	39,219	21,690
Short-term investments, Gross Unrealized Gains	58	6
Short-term investments, Gross Unrealized Losses	(3)	(3)
Short-term investments, Fair Value	39,274	21,693
U.S. Government-Sponsored Agency Bonds [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	9,334
Short-term investments, Gross Unrealized Gains	3
Short-term investments, Fair Value	9,337
Asset-Backed Securities [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	3,221	8,005
Short-term investments, Gross Unrealized Gains	2
Short-term investments, Fair Value	3,223	$ 8,005
U.S. Treasury Notes [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	999
Short-term investments, Gross Unrealized Gains	1
Short-term investments, Fair Value	$ 1,000

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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 of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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