Organization and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)		9 Months Ended
	Oct. 26, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Organization And Summary Of Significant Accounting Policies [Line Items]
Common stock, par value		$ 0.0001		$ 0.0001
Accumulated deficit		$ (207,616,000)		$ (182,953,000)
Cash and cash equivalents		52,752,000		48,910,000
Working capital		50,500,000
Short-term investments		0		$ 27,517,000
Long-lived assets, impairment losses		$ 0	$ 0
ASU No. 2020-06
Organization And Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted		true
Change in accounting principle, accounting standards update, immaterial effect		true
Subsequent Event | Equillium
Organization And Summary Of Significant Accounting Policies [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Description	Pursuant to the Merger Agreement, each share of the Company’s common stock issued and outstanding immediately prior to the closing of the Merger (the “Closing”) will be cancelled and converted into the right to receive consideration per share consisting of (i) the exchange ratio determined by dividing (x) (a) 125% of the Company’s net cash as of the Closing by (b) the price per share of Equillium’s common stock, par value $0.0001 per share (“Equillium Common Stock”) determined based on the 10 day trading volume weighted average price per share of Equillium Common Stock calculated 10 trading days prior to the date of the Closing, provided that the price per share of Equillium Common Stock shall be no less than $2.70 and no more than $4.50 by (y) the aggregate fully diluted shares of the Company’s common stock, plus (ii) any cash payable in lieu of fractional shares of Equillium Common Stock.
Percentage of net cash to determine exchange ratio numerator	125.00%
Common stock, par value	$ 0.0001
Number of trading days to determine trading volume weighted average price per share	10 days
Number of trading days to determine trading volume weighted average price per share prior to closing date	10 days
Termination fee payable in case of merger agreement termination	$ 1,250,000
Termination fee receivable in case of merger agreement termination	$ 1,750,000
Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life		3 years
Minimum | Subsequent Event | Equillium
Organization And Summary Of Significant Accounting Policies [Line Items]
Common stock, price per share	$ 2.70
Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life		5 years
Maximum | Subsequent Event | Equillium
Organization And Summary Of Significant Accounting Policies [Line Items]
Common stock, price per share	$ 4.50
Threshold net cash to consummate merger	$ 23,000,000