Organization and Description of Business - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Accumulated deficit	$ 260,723	$ 162,158
Cash and cash equivalents	28,122	$ 74,025
Working capital	25,200
Aggregate offering amount	200,000
Gross proceeds	2,900
Common stock amount remaining	$ 197,100
Common Stock
Related Party Transaction [Line Items]
Issuance of common stock in initial public offering, net (in shares)	561,848	4,124,475
SFJ Pharmaceuticals X, Ltd.
Related Party Transaction [Line Items]
Proceeds from partnership contribution	$ 42,900
Equity Distribution Agreement with Citigroup Global Markets Inc. and William Blair & Company, L.L.C.
Related Party Transaction [Line Items]
Aggregate offering amount	60,000
Common stock amount remaining	$ 57,100