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Stock-based Compensation - 2015 Inducement Award Plan (Detail) - shares
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Option to purchase (shares) 303,000  
2015 Inducement Award Plan    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Possible future issuance under equity compensation plan (in shares) 572,975  
Option to purchase (shares) 0 92,000