Commitments - Additional Information (Detail) $ / shares in Units, ¥ in Millions	Aug. 12, 2015 USD ($) $ / shares shares	Sep. 30, 2015 USD ($)	Sep. 30, 2015 CNY (¥)
Commitments And Contingencies [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed		$ 79,000,000	¥ 480
Bespoke Independent Partners
Commitments And Contingencies [Line Items]
Class of Warrant or Right, Issued | shares	900,000
Other Commitment, Total	$ 4,000
Bespoke Independent Partners | Minimum [Member]
Commitments And Contingencies [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 1.20
Bespoke Independent Partners | Maximum [Member]
Commitments And Contingencies [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 1.80
Retainer Fee | Bespoke Independent Partners
Commitments And Contingencies [Line Items]
Other Commitment, Total	$ 12,000
Due Diligence Fee | Bespoke Independent Partners
Commitments And Contingencies [Line Items]
Other Commitment, Total	$ 15,000