Summary of Significant Accounting Policies - Schedule of Financial Assets and Liabilities Measured and Recognized at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets:
Money market funds	$ 57,357	$ 79,682
Convertible promissory note	4,021
Embedded derivative asset in convertible promissory note	962
Investment in Tyme	6,030	12,200
Total financial assets	68,370	91,882
Level 1
Assets:
Money market funds	57,357	79,682
Convertible promissory note	0
Embedded derivative asset in convertible promissory note	0
Investment in Tyme	6,030	12,200
Total financial assets	63,387	91,882
Level 2
Assets:
Money market funds	0	0
Convertible promissory note	0
Embedded derivative asset in convertible promissory note	0
Investment in Tyme	0
Total financial assets	0	0
Level 3
Assets:
Money market funds	0	0
Convertible promissory note	4,021
Embedded derivative asset in convertible promissory note	962
Investment in Tyme	0
Total financial assets	$ 4,983	$ 0