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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 29, 2011 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Jun. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized |  | 50,000,000 |  | 50,000,000 |  | 50,000,000 |
Common stock, par value |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 |
Common stock, shares issued |  | 11,580,608 |  | 11,580,608 |  | 11,562,209 |
Common stock, shares outstanding |  | 10,749,683 |  | 10,749,683 |  | 10,731,284 |
Series A convertible preferred stock, shares authorized |  | 114,000 |  | 114,000 |  | 114,000 |
Series A convertible preferred stock, par value |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 |
Series A convertible preferred stock, shares issued |  | 0 |  | 0 |  | 0 |
Series A convertible preferred stock, shares outstanding |  | 0 |  | 0 |  | 0 |
Income tax benefit realized in connection with exercise of stock appreciation right |  |  |  | $ 102,000 | $ 221,000 |  |
Shares of common stock issuable upon exercise of the private placement warrant |  |  |  | 750,002 |  |  |
Common stock exercise price |  | $ 13.00 |  | $ 13.00 |  |  |
Estimated fair value | $ 2,887,000 |  |  |  |  |  |
Volatility factor | 50.00% |  |  | 55.00% |  |  |
Risk-free interest rate | 2.10% |  |  |  |  |  |
Dividend yield | 0.00% |  |  | 0.00% |  |  |
Private placement warrants term |  |  |  | 5 years |  |  |
Common stock valuation exercise price |  | $ 10.08 |  | $ 10.08 |  |  |
Shares registered for future issuance |  |  |  |  |  |  | 500,000
SAR [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unexercised shares vested under Stock appreciation right |  | 61,291 |  | 61,291 |  |  |
Stock appreciation right shares subject to vest |  | 181,290 |  | 181,290 |  |  |
Number of shares exercised |  |  |  |  | 120,000 |  |
Number of shares granted to employees |  |  |  |  | 181,291 |  |
Shares issued withheld to satisfy income tax obligation, Value |  |  |  | $ 2,248,000 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock issued |  | 1,819 | 656 | 13,399 | 11,503 |  |
Shares issued withheld to satisfy income tax obligation, Value |  | $ 27,000 | $ 21,000 | $ 316,000 | $ 361,000 |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Series A convertible preferred stock, shares authorized |  | 114,000 |  | 114,000 |  |  |
Series A convertible preferred stock, par value |  | $ 0.001 |  | $ 0.001 |  |  |
Series A convertible preferred stock, shares issued |  | 0 |  | 0 |  | 0 |
Series A convertible preferred stock, shares outstanding |  | 0 |  | 0 |  | 0 |
Common Stock [Member] | SAR [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock issued |  |  |  | 85,903 |  |  |
Private Placement Warrants [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock exercise price |  | $ 13.00 |  | $ 13.00 |  |  |
Shares issued for warrants exercised |  | 0 | 0 | 5,000 | 109,585 |  |
Common stock reserved for the exercise of the Private Placement Warrants |  | 282,257 |  | 282,257 |  | 287,257 |
Private Placement [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock exercise price |  | $ 13.00 |  | $ 13.00 |  | $ 13.00 |
Warrants expiry date |  |  |  | Apr. 29, 2016 |  |  |
Volatility factor |  |  |  | 55.00% |  | 55.00% |
Dividend yield |  |  |  | 0.00% |  | 0.00% |

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