Commitments and Contingencies - Information Related to Operating Lease (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Operating lease expense (including variable costs of $83 and $75 during the three months ended September 30, 2020 and 2019 and $224 and $225 during the nine months ended September 30, 2020 and 2019)	$ 277	$ 273	$ 813	$ 818
Cash paid for amounts included in the measurement of lease liabilities	$ 193	$ 180	$ 557	$ 535