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Convertible Notes - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 23 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 13, 2020 USD ($) shares $ / shares | Jun. 16, 2020 USD ($) shares $ / shares | May 20, 2023 | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | May 21, 2023 Day
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Payments for stock repurchase |  |  |  |  |  | $ 30,979,000 | $ 2,187,000 |
Debt instrument convertible threshold percentage of stock price trigger |  |  | 130.00% |  |  |  |  |
Interest expense |  |  |  |  | $ 2,511,000 | 2,888,000 |  |
Conversion Rate Increase [Member] |  |  |  |  |  |  |  |
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Principal amount of the convertible notes |  |  |  | $ 1,000 |  |  |  |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |  |  |  |
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Interest payable |  |  |  |  | 2,173,000 | 2,173,000 |  |
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] |  |  |  |  |  |  |  |
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Convertible senior notes face value |  |  |  |  | $ 175,000,000 | 175,000,000 |  |
Convertible debt equity component |  |  |  |  |  | 5,059,000 |  |
Issuance costs allocated to equity component of convertible debt |  |  |  |  |  | $ 157,000 |  |
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Fair value of debt component at issuance date | $ 170,191,000 | $ 170,191,000 |  |  |  |  |  |
Convertible notes discount rate |  |  |  |  | 5.33 | 5.33 |  |
Fair value of debt component of convertible senior notes |  |  |  |  | $ 167,153,000 | $ 167,153,000 |  |
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] | Private Placement [Member] |  |  |  |  |  |  |  |
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Convertible senior notes face value | $ 25,000,000 | $ 150,000,000 |  |  |  |  |  |
Convertible senior notes stated rate of interest | 4.25% | 4.25% |  |  |  |  |  |
Covertible senior notes year of maturity | 2023 | 2023 |  |  |  |  |  |
Payments for stock repurchase |  |  |  |  |  | $ 28,297,000 |  |
Repurchased common stock, shares | shares |  |  |  |  |  | 7,487,335 |  |
Repurchase price per share | $ / shares |  |  |  |  | $ 3.78 | $ 3.78 |  |
Convertible senior notes maturity date |  |  |  |  | Jun. 15, 2023 | Jun. 15, 2023 |  |
Redemption provisions - Convertible notes redemption price as a percentage of principal amount accrued interest and unpaid interest | 100.00% | 100.00% |  |  |  |  |  |
Debt instrument percentage of principal amount due to lenders entitled to declare repurchase | 25.00% | 25.00% |  |  |  |  |  |
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] | Private Placement [Member] | Conversion Price [Member] |  |  |  |  |  |  |  |
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Convertible debt instrument conversion price | $ / shares | $ 5.92 | $ 5.92 |  |  |  |  |  |
Convertible debt instrument terms of conversion | Convertible at an initial conversion rate of 168.9189 shares of the Company’s common stock, per $1,000 principal amount of notes | Convertible at an initial conversion rate of 168.9189 shares of the Company’s common stock, per $1,000 principal amount of notes |  |  |  |  |  |
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] | Private Placement [Member] | Redemption Provisions [Member] |  |  |  |  |  |  |  |
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Redemption provisions - Convertible notes | Redemption price of $7.70: The Company may redeem for cash all or any portion of the notes, at its option, on or after June 20, 2021 and on or prior to the 55th scheduled trading day immediately preceding the maturity date, if the last reported sale price of the Company's common stock has been at least 130% of the conversion price then in effect for at least 20 trading days, including the trading day immediately preceding the date on which the Company provides notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding the redemption date. No sinking fund is provided for the Convertible Notes. | Redemption price of $7.70: The Company may redeem for cash all or any portion of the notes, at its option, on or after June 20, 2021 and on or prior to the 55th scheduled trading day immediately preceding the maturity date, if the last reported sale price of the Company's common stock has been at least 130% of the conversion price then in effect for at least 20 trading days, including the trading day immediately preceding the date on which the Company provides notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding the redemption date. No sinking fund is provided for the Convertible Notes. |  |  |  |  |  |
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] | Private Placement [Member] | Conversion Rate Increase [Member] |  |  |  |  |  |  |  |
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Maximum Conversion Rate | 270.2702 | 270.2702 |  |  |  |  |  |
Maximum number of shares issuable upon conversion | shares | 47,297,285 | 47,297,285 |  |  |  |  |  |
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] | Private Placement [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Redemption provisions - Convertible notes, threshold trading days | Day |  |  |  |  |  |  |  | 20
Redemption provisions - Convertible notes, threshold consecutive trading days | Day |  |  |  |  |  |  |  | 30
US National Bank Association [Member] | Convertible Senior Notes Due Two Thousand And Twenty Three [Member] | Private Placement [Member] | Redemption Provisions [Member] |  |  |  |  |  |  |  |
Convertible Senior Notes [Line Items] |  |  |  |  |  |  |  |
Redemption provisions - Convertible notes redemption price as a percentage of principal amount accrued interest and unpaid interest |  | 100.00% |  |  |  |  |  |

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