Diluted net income (loss) per share attributable to common stockholders is based upon the weighted-average number of shares of common stock outstanding and the weighted-average number of shares outstanding assuming the issuance of common stock upon exercise of stock options, warrants to purchase common stock, and the vesting of restricted stock grants per ASC 260, “Earnings Per Share.”



	Three Months Ended March 31
	2014	2013
Weighted average number of shares outstanding:
Common stock	20,568,270	20,100,115
Common stock equivalents-stock options, grants	38,218	15,327
Diluted shares outstanding	20,606,488	20,115,442