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Section 382 Rights Agreement, Acquiring Person, Trigger, Percentage of Common Shares Outstanding

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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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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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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Stockholders' Equity - Additional Information (Details)		3 Months Ended		7 Months Ended	9 Months Ended
Stockholders' Equity - Additional Information (Details)	Nov. 06, 2018 $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares	Jan. 31, 2020 shares	Dec. 13, 2019 USD ($)	Sep. 30, 2019 $ / shares shares	Feb. 28, 2019	Oct. 23, 2018 $ / right $ / shares shares	Mar. 07, 2018 shares	Mar. 10, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		$ 19,800,000		$ 19,800,000	$ 19,800,000
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					2 years 6 months
Purchase of common stock (in shares)		1,442,306		1,442,306	1,442,306				1,686,902
Discount rate from market price, purchase date					0.15
Recognized compensation expense \| $		$ 2,501,000	$ 2,268,000		$ 7,112,000	$ 7,291,000
Total intrinsic value of options exercised \| $					$ 1,700,000	$ 11,000,000.0
Weighted average fair value of options granted (in dollars per share) \| $ / shares					$ 4.32	$ 5.08
Amount authorized and approved under share repurchase program \| $								$ 10,000,000
Amount of shares repurchased \| $				$ 1,000,000.0	$ 1,000,000.0
Number of shares repurchased (in shares)		137,000
Average price of shares repurchased (in dollars per share) \| $ / shares					$ 7.33
Preferred stock, par value (in dollars per share) \| $ / shares		$ 0.001		$ 0.001	$ 0.001				$ 0.001		$ 0.001
Percentage of common stock outstanding for acquiring person under right agreement										4.90%
Series B Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of preferred share purchase right for each share of common stock (in shares)											1
Preferred stock, share conversion ratio											0.001000
Preferred stock, purchase price per right (in dollars per right) \| $ / right											35.00
Preferred stock, redemption price per share (in dollars per share) \| $ / shares											$ 0.0001
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					2 years 7 months 6 days
Awards outstanding (in shares)		2,800,984		2,800,984	2,800,984				2,352,487
Recognized compensation expense \| $		$ 1,800,000	1,600,000		$ 5,200,000	$ 5,300,000
Unrecognized compensation expense related to nonvested awards \| $		15,200,000		$ 15,200,000	15,200,000
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		$ 1,700,000		$ 1,700,000	$ 1,700,000
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					1 year 9 months 18 days
Awards outstanding (in shares)		353,556		353,556	353,556				1,722,551
Recognized compensation expense \| $		$ 200,000	200,000		$ 500,000	700,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					2 years 8 months 12 days
Recognized compensation expense \| $		200,000	200,000		$ 500,000	500,000
Unrecognized compensation expense related to outstanding stock options \| $		1,800,000		$ 1,800,000	1,800,000
Performance Options \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		1,100,000		$ 1,100,000	$ 1,100,000
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					1 year 4 months 24 days
Number of common stock reserved for future grants (in shares)	800,000
Recognized compensation expense \| $		$ 200,000	200,000		$ 600,000	500,000
Exercise price per share (in dollars per share) \| $ / shares	$ 9.50
Vesting period of awards	3 years
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)							4,500,000
Additional common stock reserved for issuance (maximum) (in shares)							107,903
Number of common stock reserved for future grants (in shares)		3,820,692		3,820,692	3,820,692
2020 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		300,395		300,395	300,395
2020 Plan \| Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		353,556		353,556	353,556
Prior Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)		1,132,517		1,132,517	1,132,517
Prior Plans \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		1,989,599		1,989,599	1,989,599
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)		724,407		724,407	724,407							1,000,000
Shares issued to participants pursuant to employee stock purchase plan (in shares)					275,593
Recognized compensation expense \| $		$ 100,000	$ 100,000		$ 300,000	$ 300,000
ESPP \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount rate from market price, offering date					15.00%
Director Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)													1,500,000
Number of common stock reserved for future grants (in shares)		287,385		287,385	287,385
Director Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)		428,094		428,094	428,094