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Employee Stock Purchase Plan, Aggregate Common Shares Issued

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Employee Stock Purchase Plan (ESPP), Annual Employee Contribution Limit Percentage

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Employee Stock Purchase Plan (ESPP), Employee Purchase Price Percentage

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Employee Stock Purchase Plan, Share Remaining Available for Issuance

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Number of equity incentive compensation plans maintained by the Company.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Aggregate Intrinsic Value

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Weighted average period over which unrecognized compensation is expected to be recognized for employee service share-based compensation, which may be expressed in a decimal value for number of years.

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The weighted average remaining contractual term for stock-based awards, which may be expressed in a decimal value for number of years.

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Share-based Compensation Arrangement by Share-based Payment Award, Maximum Contractual Term

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Share-based Compensation Arrangement By Share-based Payment Award, Stock Options, Average Maximum Vesting Period

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Share-based Compensation Arrangement by Share-based Payment Award, Stock Options, Average Vesting Period, Minimum

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Share-based Compensation Arrangement By Share-based Payment Award, Stock Plan Offering Period

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Face amount per share of no-par value common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Gross number of share options (or share units) granted during the period.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Equity - Narrative (Details)		1 Months Ended	12 Months Ended
Equity - Narrative (Details)	Feb. 16, 2021 USD ($) $ / shares shares	Mar. 31, 2021 shares	Sep. 30, 2021 USD ($) plan $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 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			3
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)			43,890,000	36,461,000
Preferred stock, shares issued (in shares)			0	0
Preferred stock, outstanding (in shares)			0	0
Matching contribution \| $			$ 1,100,000	$ 1,000,000	$ 600,000
Aggregate common shares issued under ESPP (in shares)			3,395,090
Shares remaining available for issuance under the ESPP (in shares)			0
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock - ESPP (in shares)			192,000	231,000	197,000
Common Stock \| IPO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of Stock, Number of Shares Issued in Transaction	6,655,093
Sale of Stock, Price Per Share \| $ / shares	$ 5.40
Proceeds from Issuance Initial Public Offering \| $	$ 33,100,000
Common Stock \| Over-Allotment Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of Stock, 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)		2,138,000
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	8,154
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 \| $			$ 6,700,000
Weighted average remaining service period (in years)			2 years 8 months 12 days
Unvested stock units (in shares)			1,804,854	1,548,045
Unvested stock units \| $			$ 13,500,000
Unvested stock units weighted average remaining contractual term (in years)			2 years 8 months 12 days
Intrinsic value vested \| $			$ 3,600,000	$ 1,300,000	$ 1,400,000
Weighted average fair value (in usd per share) \| $ / shares			$ 5.55	$ 3.41	$ 3.68
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining service period (in years)			1 year 3 months 18 days
Unvested stock units (in shares)			967,000	868,500
Intrinsic value vested \| $			$ 34,400	$ 0	$ 200,000
Weighted average fair value (in usd per share) \| $ / shares			$ 7.39	$ 3.81	$ 5.19
Unamortized stock-based compensation expense \| $			$ 2,400,000
Intrinsic value of non-vested and expected to vest PSUs \| $			$ 7,200,000
Average remaining contractual term (in years)			1 year 3 months 18 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