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Equity - Narrative (Details)
12 Months Ended
Feb. 16, 2021
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
plan
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of equity incentive compensation plans maintained by the company | plan   4  
Granted (in shares)   0 0
Common stock, shares authorized (in shares)   50,000,000 50,000,000
Common stock, no par value (in dollars per share) | $ / shares   $ 0 $ 0
Preferred stock, shares authorized (in shares)   5,882,352  
Preferred stock par value (in usd per share) | $ / shares   $ 0.0001  
Common stock, shares issued (in shares)   44,497,000 43,890,000
Preferred stock, shares issued (in shares)   0 0
Preferred stock, outstanding (in shares)   0 0
Aggregate common shares issued under ESPP (in shares)     3,395,090
Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuance of common stock - ESPP (in shares)   0 192,000
Common Stock | IPO      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares issued in transaction 6,655,093    
Common stock price per share | $ / shares $ 5.40    
Proceeds from public offering | $ $ 33,100,000    
Common Stock | Over-Allotment Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares issued in transaction 868,056    
2019 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional number of shares authorized for the plan (in shares)   1,900,000  
2022 New Employee Inducement Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional number of shares authorized for the plan (in shares)   380,000  
ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ESPP offering period (months)   6 months  
Purchase price (as percentage of market price)   85.00%  
Annual contribution (as percentage of compensation)   10.00%  
Annual contribution | $   $ 25,000  
Employee stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options, average minimum vesting period (in years)   4 years  
Stock options, average maximum vesting period (in years)   5 years  
Stock options, contractual life (in years)   10 years  
RSAs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested stock units (in shares)   0 0
Intrinsic value vested | $     $ 27,300
Weighted average fair value (in usd per share) | $ / shares   $ 0  
RSAs | Equity Incentive Plans 2012 and 2010 | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years)   3 years  
RSAs | Equity Incentive Plans 2012 and 2010 | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years)   4 years  
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unamortized stock-based compensation expense | $   $ 9,500,000  
Weighted average remaining service period (in years)   2 years 10 months 24 days  
Unvested stock units (in shares)   2,945,380 1,804,854
Unvested stock units | $   $ 4,900,000  
Unvested stock units weighted average remaining contractual term (in years)   1 year 8 months 12 days  
Intrinsic value vested | $   $ 3,000,000 $ 3,600,000
Weighted average fair value (in usd per share) | $ / shares   $ 3.46 $ 3.41
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average remaining service period (in years)   1 year 8 months 12 days  
Unvested stock units (in shares)   1,809,053 967,000
Intrinsic value vested | $   $ 321,300 $ 34,400
Weighted average fair value (in usd per share) | $ / shares   $ 4.51 $ 3.81
Unamortized stock-based compensation expense | $   $ 5,000,000  
Intrinsic value of non-vested and expected to vest PSUs | $   $ 3,000,000  
Average remaining contractual term (in years)   1 year 8 months 12 days  
PSUs | Two Thousand Twelve Equity Incentive Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years)   1 year  
PSUs | Two Thousand Twelve Equity Incentive Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years)   3 years  
PRSAs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unamortized stock-based compensation expense | $     $ 0