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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 02, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
May 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Unrecognized stock based compensation expense           $ 1,849    
2012 Equity Incentive Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common stock shares authorized for issuance             880,000 440,000
2012 Equity Incentive Plan | Minimum                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Expiration period       5 years   5 years    
Percent of voting power       10.00%   10.00%    
2012 Equity Incentive Plan | Maximum                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Expiration period       10 years   10 years    
2012 Equity Incentive Plan | Restricted Stock                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Restricted stock shares issued       160,600   44,000 338,800  
Grant date fair value per share       $ 3.85   $ 8.06 $ 8.06  
Stock compensation expense recognized   $ 229 $ 196 $ 650 $ 611 $ 793 $ 419  
Unrecognized stock based compensation expense   $ 1,775   $ 1,775   $ 1,849    
Vesting of restricted stock, shares       90,090   98,560 21,560  
2012 Equity Incentive Plan | Restricted Stock | Minimum                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Grant date fair value per share       $ 1.89   $ 1.89    
Shares vest over period           2 years    
2012 Equity Incentive Plan | Restricted Stock | Maximum                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Grant date fair value per share       $ 8.06   $ 8.06    
Shares vest over period           5 years    
2012 Equity Incentive Plan | Performance Based Restricted Stock | Subsequent Event                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Vesting of restricted stock, shares 77,000              
Accelerated recognition of remaining compensation expense $ 231