Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Concentration of Credit Risk
Deposits in excess of federally insured amounts	$ 12,400
Income Taxes
Provision (benefit) for income taxes	$ 0	$ 0
Segment Information
Number of operating segment | segment	1
Minimum
Estimated useful life	3 years
Maximum
Estimated useful life	5 years