Related party transactions: (Tables)

12 Months Ended

Dec. 31, 2012

Related party transactions:

Schedule of related party transactions

	Year  ended December 31, 2012		Nine months ended December 31, 2011		Year  ended March 31, 2011
Research and development	$	223	$	148	$	314
General and administrative	1,007		338		1,164
Sales and marketing	2,830		2,598		3,501
	$	4,060	$	3,084	$	4,979