Commitments and Contingencies - Schedule of Lease Costs and Weighted-Average Assumptions Used in Determining its Right-of-Use Assets and Lease Liabilities (Parenthetical) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Lease	Sep. 30, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Operating lease cost	$ 200,000	$ 200,000	$ 549,000	$ 501,000
Cash paid for operating leases	$ 200,000	$ 200,000	$ 542,000	508,000
Number of modified existing operating lease | Lease			4
New leases commenced during the period				$ 0