Organization and Description of Business - Additional Information (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Jan. 31, 2020 USD ($)
Organization and Description of Business [Line Item]
Accumulated deficit	$ 402,935,000	$ 391,794,000
Cash and cash equivalents	18,688,000	$ 41,800,000
Working capital	5,900,000
Aggregate offering price	200,000,000
Aggregate offering price			$ 200,000,000
Aggregate offering price, remaining	$ 131,400,000
Reportable segment | segment	1
SFJ Pharmaceuticals X, Ltd.
Organization and Description of Business [Line Item]
Proceeds from partnership contribution	$ 25,400,000
Equity Distribution Agreement with Citigroup Global Markets Inc. and William Blair & Company, L.L.C.
Organization and Description of Business [Line Item]
Aggregate offering price	60,000,000
Aggregate offering price			$ 60,000,000
Aggregate offering price, remaining	$ 55,800,000