Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Total property and equipment–at cost	$ 9,477	$ 9,654
Less: Accumulated depreciation	(7,059)	(5,903)
Property and equipment, net	2,418	3,751
Equipment
Property Plant And Equipment [Line Items]
Total property and equipment–at cost	7,040	7,230
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment–at cost	629	629
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment–at cost	896	896
Software
Property Plant And Equipment [Line Items]
Total property and equipment–at cost	$ 912	669
Assets Not Yet Placed in Service
Property Plant And Equipment [Line Items]
Total property and equipment–at cost		$ 230