Intangible assets, net (Tables)

12 Months Ended

Mar. 31, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Carrying amount of Intangible Assets

The following table summarizes the carrying amount of intangible assets comprise:

	As of March 31, 2012
	Gross  carrying value		Accumulated amortization		Net  carrying value
	US$		US$		US$
Customer contracts		14,547		6,465		8,082
Intellectual property		3,060,969		583,042		2,477,927
Total intangible assets, net		3,075,516		589,507		2,486,009

	As of March 31, 2013
	Gross  carrying value		Accumulated amortization		Net  carrying value
	US$		US$		US$
Customer contracts		13,684		10,642		3,042
Intellectual property		2,879,190		959,730		1,919,460
Total intangible assets, net		2,892,874		970,372		1,922,502

Aggregate Estimated Amortization Expense for Intangible Assets

The aggregate estimated amortization expense for intangible assets for each of the five succeeding fiscal years is given in the table below:

Year ending March 31,	US$
2014		414,354
2015		411,313
2016		411,313
2017		411,313
2018		274,209