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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 15, 2013 | Jul. 16, 2013 | Oct. 31, 2011 | Apr. 29, 2011 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 10, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 50,000,000 | 50,000,000 |  |
Common stock, par value |  |  |  |  | $ 0.001 | $ 0.001 |  |
Common stock, shares issued |  |  |  |  | 11,583,831 | 11,562,209 |  |
Common stock, shares outstanding |  |  |  |  | 10,752,906 | 10,731,284 |  |
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 |  |
Series A convertible preferred stock, shares outstanding |  |  |  |  | 0 | 0 |  |
Shares issued withheld to satisfy income tax obligation, Value |  |  |  |  | $ 351,000 | $ 430,000 | $ 2,063,000 |
Income tax benefit realized in connection with exercise of stock appreciation right |  |  |  |  | $ 65,000 | $ 2,704,000 | 1,642,000 |
Shares of common stock issuable upon exercise of the private placement warrant |  |  |  |  | 750,002 |  |  |
Common stock exercise price |  |  |  |  | $ 13.00 |  |  |
Estimated fair value |  |  |  | $ 2,887,000 |  |  |  |
Volatility factor |  |  |  | 50.00% |  |  |  |
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 |  |  |
Common stock repurchased by the company, shares |  |  |  |  | 830,925 | 830,925 |  |
Common stock repurchased by the company, value |  |  |  |  | $ 4,250,000 | $ 4,250,000 |  |
Proceeds to the company from public offering |  |  |  |  |  |  | $ 36,750,000 |
Proceeds from sale of shares |  |  |  |  | $ 0 |  |  |
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 |  |
Grantee exercised Stock appreciation right | 181,291 |  |  |  |  | 120,000 |  |
Number of shares granted to employees |  |  |  |  |  | 181,291 |  |
Common stock issued | 96,504 |  |  |  |  |  |  |
Shares issued withheld to satisfy income tax obligation, Value | $ 2,063,000 |  |  |  |  | $ 2,427,000 |  |
Shares issued withheld to satisfy income tax obligation | 42,314 |  |  |  |  |  |  |
Income tax benefit realized in connection with exercise of stock appreciation right | $ 1,642,000 |  |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  | 16,622 | 13,909 |  |
Shares issued withheld to satisfy income tax obligation, Value |  |  |  |  | $ 351,000 | $ 430,000 |  |
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 |  |  |
Series A convertible preferred stock, par value |  |  |  |  | $ 0.001 |  |  |
Series A convertible preferred stock, shares issued |  |  |  |  | 0 | 0 |  |
Series A convertible preferred stock, shares outstanding |  |  |  |  | 0 | 0 |  |
Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock repurchased by the company, shares |  |  | 830,925 |  |  |  |  |
Common stock repurchased by the company, value |  |  | $ 4,250,000 |  |  |  |  |
Common stock repurchased by the company, per share value |  |  | $ 5.11 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total Shares registered for future issuance |  |  |  |  |  |  |  | 150,000,000
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 |  |  |
Shares issued for warrants exercised |  |  |  |  | 5,000 | 109,585 | 339,410 |
Common stock reserved for the exercise of the Private Placement Warrants |  |  |  |  | 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 |  |
Warrants expiry date |  |  |  |  | Apr. 29, 2016 |  |  |
Volatility factor |  |  |  |  | 55.00% | 55.00% |  |
Dividend yield |  |  |  |  | 0.00% | 0.00% |  |
Underwritten public offering price per share |  |  |  |  | $ 18.25 | $ 51.61 |  |
Underwritten Public Offering [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Public offering shares |  | 2,005,000 |  |  |  |  |  |
Underwritten public offering price per share |  | $ 35.00 |  |  |  |  |  |
Shares sold through public offering |  | 1,050,000 |  |  |  |  |  |
Share sold by stockholders through public offering |  | 955,000 |  |  |  |  |  |
Proceeds to the company from public offering |  | $ 34,530,000 |  |  |  |  |  |
Public offering expense |  | $ 514,000 |  |  |  |  |  |

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