Summary of Significant Accounting Policies - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Lab supply inventory	$ 2,423	$ 1,825
Prepaid expenses	489	971
Funds in escrow		888
Letter of credit	350
Due from CGI	525	92
Other	74	75
Total other current assets	$ 3,861	$ 3,851