Collaboration with Tyme (Details) - USD ($)		3 Months Ended
	Jan. 07, 2020	Mar. 31, 2021	Mar. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Fair value gain		$ 5,600,000	$ (6,500,000)
Collaborative Arrangement | Tyme
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total value	$ 40,000,000.0
Upfront payment	$ 20,000,000.0
Number of shares receivable (in shares)	10,000,000
Shares receivable (in usd per share)	$ 2.00
Term	3 years
Second milestone payment due	$ 20,000,000.0
Second milestone payment in cash payment due	10,000,000.0
Second milestone payment in investment due	$ 10,000,000.0
Second milestone payment, premium on investment prevailing market price	15.00%
Co-promotion agreement, percentage of promotional sales effort responsible for	25.00%
Co-promotion agreement, percentage of net revenue receivable	15.00%
Co-promotion agreement, percentage of net revenue receivable due to collaborator	85.00%
Co-promotion agreement, right to repurchase, amount	$ 200,000,000.0
Value of shares received	17,500,000
Upfront collaboration payment	$ 2,500,000
Percentage of shares received of collaborator	9.00%
Fair value gain		$ 5,600,000