Acquisition - Schedule of Assets Acquired, Liabilities Assumed and Amounts Expensed (Details) - Rodin Therapeutics, Inc. $ in Thousands	Nov. 18, 2019 USD ($)
Business Acquisition [Line Items]
Cash	$ 2,658
Prepaid expenses and other current assets	461
Deferred tax assets	11,642
Right-of-use assets	637
Other assets	137
Accounts payable and accrued expenses	(3,364)
Operating lease liabilities—short-term	(400)
Operating lease liabilities—long-term	(237)
Research and development expense	$ 86,594