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Redeemable Convertible Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Class Of Stock [Line Items]    
Accretion amount $ 10 $ 10
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