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Stockholders' Equity - Narrative (Details) - USD ($)
1 Months Ended 9 Months Ended
Jul. 21, 2021
Nov. 06, 2020
May 08, 2020
Apr. 05, 2019
Jan. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Proceeds from sale of common stock under an at-the-market sales agreement, net           $ 26,560,000 $ 52,622,000
April 2019 ATM Agreement              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum proceeds   $ 60,000,000 $ 75,000,000 $ 150,000,000      
Registration Statement, July 2021              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum proceeds $ 300,000,000            
Registration Statement, July 2021 | Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum proceeds $ 150,000,000            
Securities Purchase Agreement | Hanmi Pharmaceutical Co. Ltd. (“Hanmi”)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares sold in public offering (in shares)         12,500,000    
Shares sold in public offering (in dollars per share)         $ 1.60    
Proceeds from sale of common stock under an at-the-market sales agreement, net         $ 20,000,000