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Redeemable Convertible Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Class Of Stock [Line Items]          
Accretion amount $ 10 $ 10   $ 40 $ 30
Series A Convertible Preferred Stock          
Class Of Stock [Line Items]          
Cumulative dividends at a rate       6.00%  
Redeemable convertible preferred stock, liquidation preference per share $ 5.00   $ 5.00 $ 5.00  
Dividend declared on convertible preferred shares     $ 150