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Redeemable Convertible Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Class Of Stock [Line Items]        
Accretion amount $ 10 $ 10 $ 20 $ 20
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  
Accrued dividends $ 80   $ 80