Stockholders' equity

12 Months Ended

Dec. 31, 2015

Stockholders' equity

Stockholders' equity

10. Stockholders' equity

        At December 31, 2015 and 2014, we are authorized to issue up to 100,000,000 shares of common stock. We are required to reserve and keep available out of our authorized but unissued shares of common stock such number of shares sufficient to effect the exercise of all outstanding common stock warrants, plus shares granted and available for grant under our Amended and Restated 2001 Stock Incentive Plan (the "2001 Plan") and 2011 Equity Incentive Plan (the "2011 Plan").

        The amount of such shares of common stock reserved for these purposes is as follows:

	December 31, 2015		December 31, 2014
	(in thousands)
Outstanding stock options under the 2001 Plan		1,220		1,525
Outstanding stock options under the 2011 Plan		2,528		2,816
Outstanding RSUs under the 2011 Plan		1,819		1,385
Shares available for grant under the 2011 Plan		5,978		4,492
Total		11,545		10,218