Common stock (Tables)

6 Months Ended

9 Months Ended

Jun. 30, 2012

Dec. 31, 2011

Common stock

Schedule of shares of common stock reserved for the potential conversion of the Series A Preferred Stock and the exercise of stock options and stock awards

	June 30, 2012		December 31, 2011
Series A Preferred Stock		3,064,753		3,064,753
Series B Preferred Stock		6,770,563		—
Outstanding stock options and stock awards		686,542		617,633
		10,521,858		3,682,386

	December 31, 2011
Series A Preferred Stock		3,064,753
Exercise of stock options and awards		617,633
		3,682,386