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Bank Loan - Additional Information (Detail) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2016 | Jun. 30, 2016 | Jan. 21, 2016 | Sep. 17, 2015 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) Installment | Sep. 30, 2015 USD ($) | Jan. 20, 2016 | Sep. 16, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term loan outstanding principal balance |  |  |  |  | $ 30,625,000 |  |  |
US Bank National Association Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of monthly installments payable | Installment |  |  |  |  | 48 |  |  |
Required monthly loan principal repayment |  |  |  |  | $ 364,583 |  |  |
Common stock repurchase, share | shares |  |  |  | 1,000,000 |  |  |  |
Common stock repurchase, price per share | $ / shares |  |  |  | $ 25 |  |  |  |
Outstanding bank loan |  |  |  | $ 35,000,000 |  |  |  |
Long-term loan outstanding principal balance |  |  |  |  |  |  |  | $ 23,000,000
Effective interest rate on debt |  |  | 4.00% |  |  |  | 4.25% |
Final installment date |  |  |  |  | Sep. 17, 2019 |  |  |
Amortized loan costs |  |  |  |  | $ 410,000 |  |  |
Amortized cost on straight-line basis in months |  |  |  |  | 48 months |  |  |
Amortization expenses |  |  |  |  | $ 150,000 | $ 90,000 |  |
US Bank National Association Loan [Member] | Promissory Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding bank loan |  |  |  | 20,000,000 |  |  |  |
California Bank And Trust Loan [Member] | Promissory Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding bank loan |  |  |  | $ 15,000,000 |  |  |  |
Prime Rate [Member] | US Bank National Association Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 0.50% |  |  |
One Month Libor [Member] | US Bank National Association Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 3.00% |  |  | 1.00% |  |  |
Effective interest rate on debt |  |  |  |  | 3.52322% |  |  |
Principal loan balance converted |  |  |  |  | $ 32,800,000 |  |  |
Debt instrument converted rate | 0.52322% |  |  |  |  |  |  |
Debt conversion description |  |  |  |  | The Company intends to renew the 1-month LIBOR contract on a monthly basis provided that the LIBOR based interest rate remains favorable to the prime rate based interest rate. |  |  |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | US Bank National Association Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 2.75% |  |  |
Minimum [Member] | One Month Libor [Member] | US Bank National Association Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument additional basis spread |  |  | 0.75% |  | 0.25% |  |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | US Bank National Association Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 3.25% |  |  |
Maximum [Member] | One Month Libor [Member] | US Bank National Association Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument additional basis spread |  |  | 0.50% |  | 0.75% |  |  |

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