Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2014

Property and Equipment, net

Schedule of property and equipment, net

	As of December 31,
	2013		2014
					US$ (Note 2(c))
Computers and equipment	25,307,217		43,961,251		7,085,268
Leasehold improvements	19,649,572		43,684,247		7,040,623
Furniture and fixtures	3,212,488		6,342,892		1,022,289
Software	3,537,387		11,919,553		1,921,083
Subtotal	51,706,664		105,907,943		17,069,262
Less: Accumulated depreciation	(26,855,361	)	(36,542,052	)	(5,889,510	)
Property and equipment subject to depreciation	24,851,303		69,365,891		11,179,752
Construction in progress	—		2,944,399		474,551
Total	24,851,303		72,310,290		11,654,303