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Redeemable Convertible Preferred Stock - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
Installment
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Temporary Equity [Line Items]          
Accretion amount | $ $ 10 $ 10 $ 40 $ 40  
Series A Convertible Preferred Stock          
Temporary Equity [Line Items]          
Cumulative dividends at a rate     6.00%    
Redeemable convertible preferred stock, liquidation preference per share $ 5.00   $ 5.00    
Series A Convertible Preferred Stock | Accounts Payable and Other Accrued Expenses          
Temporary Equity [Line Items]          
Total accrued but unpaid dividends | $ $ 80   $ 80   $ 230
Series A Convertible Preferred Stock | Scenario, Plan          
Temporary Equity [Line Items]          
Redeemable convertible preferred stock, liquidation preference per share $ 5.00   $ 5.00    
Redemption price per share $ 5.00 $ 5.00 $ 5.00 $ 5.00  
Number of redemption price, accrued and unpaid dividends installment payments | Installment     36    
Annual interest rate on redemption value payable     6.00%    
Series A Convertible Preferred Stock | Scenario, Plan | Maximum          
Temporary Equity [Line Items]          
Majority outstanding shares redeemable date     Apr. 30, 2017