Basic and Diluted Net Loss per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Basic and Diluted Net Loss per Share

19. Basic and Diluted Net Loss per Share

Basic net loss per common share is computed by dividing net loss attributable to common stockholders by the weighted average number of common shares outstanding during the period. Diluted net loss per common share is computed giving effect to all dilutive potential common shares that were outstanding during the period. Diluted potential common shares consist of incremental shares issuable upon exercise of stock options, warrants and restricted stock units. In computing diluted net loss per share for the years ended December 31, 2018, 2017, and 2016, no adjustment has been made to the weighted average outstanding common shares as the assumed exercise of outstanding options, warrants and restricted stock units would be anti-dilutive.

Potential common shares not included in calculating diluted net loss per share are as follows:

	December 31,
	2018		2017		2016
Stock options		19,899,631		15,693,675		12,488,551
Stock warrants		4,329,437		13,162,668		1,426,622
Nonvested restricted stock units		4,967,144		4,394,656		895,328
Total		29,196,212		33,250,999		14,810,501