Stock-based compensation (Tables)

12 Months Ended

Mar. 31, 2015

Fair Value of Options, Black-Scholes Model Assumptions [Table Text Block]

The fair value of each option is estimated on the date of grant using the Black-Scholes model with the following assumptions:

	Years ended March 31,
	2013		2014			2015
Dividend yield		—		0	%		0	%
Expected term		—		5.5 – 7 years			5.5 – 7 years
Risk free interest rates		—		0.71% - 1.14	%		1.41% - 2.10	%
Expected volatility		—		81.27% - 86.68	%		79.72%% - 83.64	%

Compensation Cost Allocated to Cost of Revenues and Operating Expenses[Table Text Block]

The compensation cost has been allocated to cost of revenues and operating expenses as follows:

	Year ended March 31,
	2013		2014		2015
	US$		US$		US$
Cost of revenues		50,151		17,425		466
Sales and marketing		122,316		119,653		80,793
Product development		321,473		207,400		175,616
General and administrative		262,150		137,085		169,830

Stock Option Plan 2002

Summary of Option Activity[Table Text Block]

A summary of option activity under the 2002 ESOP plan as of March 31, 2015, and changes during the year then ended is presented below:

					Weighted
			Weighted		average
			average		remaining	Aggregate
	Number of Options		exercise		contractual	intrinsic
Options	(in terms of shares)		price		term (year)	value
			US$			US$
Outstanding as at April 1, 2014		11,750		18.88
Expired		3,500		11.37
Outstanding as at March 31, 2015		8,250		22.06	6.3		—
Exercisable as at March 31, 2015		6,375		22.06	6.3		—

Stock Option Plan 2004

Summary of Option Activity[Table Text Block]

A summary of option activity under the 2004 ESOP plan as of March 31, 2015, and changes during the year then ended is presented below:

					Weighted
			Weighted		average
	Number of		average		remaining		Aggregate
	options (in  terms		exercise		contractual		intrinsic
Options	of shares)		price		term (year)		value
			US$				US$
Outstanding as at April 1, 2014		131,237		11.59
Granted		22,750		3.74
Expired		55,112		10.97
Forfeited		1,500		3.74
Outstanding as at March 31, 2015		97,375		10.22		4.4		2,125
Exercisable as at March 31, 2015		76,125		12.03		3.0		—

Stock Option Plan 2006

Summary of Option Activity[Table Text Block]

A summary of option activity under the 2006 ESOP plan as of March 31, 2015, and changes during the year then ended is presented below:

					Weighted
			Weighted		average
	Number of		average		remaining
	options (in		exercise		contractual		Aggregate
Options	terms of shares)		price		term (year)		intrinsic  value
			US$				US$
Outstanding as at April 1, 2014		490,563		8.54
Forfeited		1,250		0.16
Outstanding as at March 31, 2015		489,313		8.54		3.8		288,898
Exercisable as at March 31, 2015		477,313		8.47		3.8		288,898

Stock Option Plan 2015

Summary of Option Activity[Table Text Block]

A summary of option activity under the 2015 ESOP plan as of March 31, 2015, and changes during the year then ended is presented below:

					Weighted
			Weighted		average
	Number of		average		remaining		Aggregate
	options (in  terms		exercise		contractual		intrinsic
Options	of shares)		price		term (year)		value
			US$				US$
Granted		36,800		3.74
Outstanding as at March 31, 2015		36,800		3.74		9.8		3,680
Exercisable as at March 31, 2015		—		—		—		—