STOCKHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2016

Stockholders' Equity Note [Abstract]

Stockholders' Equity

Common Stock

The following shares were reserved for future issuance:



	December 31, 2016
Common stock options outstanding and available for future grant	3,452,409
Warrants to purchase common stock	695,383
Employee Stock Purchase Plan	238,872
	4,386,664

Warrants

The Company issued warrants in connection with private placements of common stock in November 2012. As of December 31, 2016 the following warrants for common stock were issued and outstanding:



Issue date	Expiration date	Exercise price		Number of warrants outstanding
November 21, 2012	November 21, 2017	$	7.86	695,383

During the year ended December 31, 2016, warrants for 289,789 shares of the Company's common stock were exercised via cashless exercises and 313,756 shares were exercised for cash generating proceeds of $2.1 million and the Company issued a total of 603,545 shares of common stock.

During the years ended December 31, 2015 and 2014, warrants for 1,037,330 and 73,964 shares of the Company's common stock were exercised via cashless exercises and the Company issued a total of 809,498 and 43,526 shares of common stock, respectively.