Quarterly report pursuant to Section 13 or 15(d)

Net Income (Loss) Per Share (Schedule of Basic and Diluted Net Income (Loss) Per Share) (Details)

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Net Income (Loss) Per Share (Schedule of Basic and Diluted Net Income (Loss) Per Share) (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Numerator:          
Net income (loss) used to compute net income (loss) per share: Basic $ 12,024,361 $ (1,893,924) $ (13,614,016) $ (9,090,634)  
Less gain on change in fair value of warrant liability (15,773,100)        
Diluted, as adjusted $ (3,748,739) $ (1,893,924) $ (13,614,016) $ (9,090,634)  
Denominator:          
Weighted-average common shares outstanding used in computing basic net income (loss) per share: Basic 78,513,144 21,085,283 74,943,169 20,937,488  
Dilutive effect of warrants 750,653        
Dilutive effect of stock options 4,072,574        
Diluted, as adjusted 83,336,371 21,085,283 74,943,169 20,937,488  
Net income (loss) per share, basic $ 0.15 $ (0.09) $ (0.18) $ (0.43)  
Net loss per share, diluted $ (0.04) $ (0.09) $ (0.18) $ (0.43)  
Common stock issued for acquisition         5,280,368