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Stockholders' Equity - Common Stock Reserved for Future Issuance (Detail)
Sep. 30, 2022
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 2,686,213
Equity Incentive Plan 2012 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 510,412
2016 Employee Stock Purchase Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 75,000
Stock options [Member] | Equity Incentive Plan 2012 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 1,353,592
Stock options [Member] | 2016 Employee Stock Purchase Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 59,435
Stock options [Member] | 2021 Inducement Equity Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 700,000
Stock options [Member] | Incentive Award Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 50,000
Restricted stock units (RSUs) [Member] | Equity Incentive Plan 2012 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 12,774