Stockholders' equity (Tables)

12 Months Ended

Dec. 31, 2014

Stockholders' equity

Schedule of amount of shares of common stock reserved

	December 31, 2014		December 31, 2013
	(in thousands)
Outstanding stock options under the 2001 Plan		1,525		1,859
Outstanding stock options under the 2011 Plan		2,816		3,096
Outstanding RSUs under the 2011 Plan		1,385		753
Shares available for grant under the 2011 Plan		4,492		3,259
Total		10,218		8,967