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Redeemable convertible preferred stock (Detail) - Jun. 30, 2015 - USD ($)
Total
Redeemable Convertible Preferred Stock Series A-1 [Member]  
Temporary Equity [Line Items]  
Original Issue Price $ 0.0100
Shares Designated 5,000,000
Shares Issued 5,000,000
Shares Outstanding 212,466
Liquidation Preference $ 195,264
Redeemable Convertible Preferred Stock Series A-2 [Member]  
Temporary Equity [Line Items]  
Original Issue Price $ 1.6996
Shares Designated 1,176,748
Shares Issued 1,176,748
Shares Outstanding 161,355
Liquidation Preference $ 274,239
Series B Convertible Preferred Share [Member]  
Temporary Equity [Line Items]  
Original Issue Price $ 1,000
Shares Designated 2,750
Shares Issued 2,750
Shares Outstanding 1,102
Liquidation Preference $ 1,102,000