9. Stockholders' equity

At December 31, 2017 and 2016, 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"), as amended. Refer to Note 14 for a discussion of the 2011 Plan amendments.

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

	December 31, 2017		December 31, 2016
	(in thousands)
Outstanding stock options under the 2001 Plan		155		1,090
Outstanding stock options under the 2011 Plan		1,128		1,994
Outstanding RSUs under the 2011 Plan		3,324		3,825
Shares available for grant under the 2011 Plan		3,863		2,576

Total		8,470		9,485