LOSS PER COMMON SHARE

6 Months Ended

Jun. 30, 2019

Basic and diluted net loss per common share is calculated by dividing net loss applicable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration of common stock equivalents. The Company’s potentially dilutive shares, which include outstanding stock options, restricted stock units, warrants, and shares issuable upon conversion of the 2019 Notes and 2025 Notes, are considered to be common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive.

Basic and diluted net loss per share is calculated as follows (net loss amounts are stated in thousands):



	Three Months Ended June 30,
	2019							2018
	Shares	Net Loss			EPS			Shares	Net Loss			EPS
Basic and diluted loss per share	41,957,860	$	(38,701	)	$	(0.92	)	40,061,045	$	(22,329	)	$	(0.56	)



	Six Months Ended June 30,
	2019							2018
	Shares	Net Loss			EPS			Shares	Net Loss			EPS
Basic and diluted loss per share	41,685,599	$	(79,678	)	$	(1.91	)	39,641,334	$	(40,707	)	$	(1.03	)

The following common stock equivalents have been excluded because they were anti-dilutive (in thousands):



	Three Months Ended June 30,		Six Months Ended June 30,
	2019	2018	2019	2018
Restricted stock units	650	350	600	250
Convertible debt	7,900	2,600	8,200	2,600
Options	7,950	7,200	7,800	7,100
Warrants	—	450	—	550
Total anti-dilutive shares	16,500	10,600	16,600	10,500