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 warrants to purchase common stock, and the vesting of restricted stock grants per ASC 260, “Earnings Per Share.”



	Three Months Ended September 30		Nine Months Ended September 30
	2015	2014	2015	2014
Weighted average number of shares outstanding:
Common stock	20,669,348	20,591,529	20,658,750	20,582,082
Common stock equivalents-stock options, grants	79,544	32,006	70,969	33,100
Diluted shares outstanding	20,748,892	20,623,535	20,729,719	20,615,182