Cash, Cash Equivalents and Available for Sale Securities - Schedule of Available for Sale Securities (Details) - USD ($)	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 108,302,000
Gross Unrealized Gains	6,000
Gross Unrealized Losses	(5,000)
Fair Value	108,303,000	$ 0
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45,220,000
Gross Unrealized Gains	1,000
Gross Unrealized Losses	0
Fair Value	45,221,000
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52,862,000
Gross Unrealized Gains	2,000
Gross Unrealized Losses	(5,000)
Fair Value	52,859,000
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,220,000
Gross Unrealized Gains	3,000
Gross Unrealized Losses	0
Fair Value	$ 10,223,000

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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