Millendo Merger (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Jun. 25, 2021
Business Acquisition [Line Items]
Cash and cash equivalents		$ 51,829,000	$ 18,820,000
Operating lease right-of-use assets		3,051,000	1,877,000
Present value of operating lease obligations		3,468,000
Stock-based compensation expense		1,105,000	453,000
General and Administrative Expense
Business Acquisition [Line Items]
Stock-based compensation expense		802,000	$ 64,000
Private Tempest Member
Business Acquisition [Line Items]
Cash and cash equivalents				$ 17,000,000.0
Prepaid expenses and other assets				1,400,000
Assumed payables and accruals				500,000
Operating lease right-of-use assets				2,100,000
Present value of operating lease obligations				$ 2,100,000
Private Tempest Member | General and Administrative Expense
Business Acquisition [Line Items]
Stock-based compensation expense	$ 200,000
Private Tempest Member | Additional Paid-in Capital
Business Acquisition [Line Items]
Transaction costs		$ 6,400,000