Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Restricted cash in other long term assets, deposit for lease facility	$ 2,275,000	$ 2,275,000		$ 2,275,000	$ 802,000	$ 802,000
ASU 2016-13
Summary Of Significant Accounting Policies [Line Items]
Debt Securities, available-for-sale, allowance for credit loss			$ 0
ASU 2019-12
Summary Of Significant Accounting Policies [Line Items]
Income tax benefit, continuing operations	0	0
Income tax provision, other comprehensive Income	$ 0	$ 0