NET LOSS PER COMMON SHARE (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings per Common Share

The following table sets forth the computation of basic and diluted loss per common share (common shares in thousands):

	Years Ended December 31,
	2019		2018		2017
Numerator:
Net loss, basic	$	(23,848)	$	(77,211)	$	(117,042)
Less: gain on common stock held by the NQDC	—		(710)		—
Net loss, diluted	$	(23,848)	$	(77,921)	$	(117,042)
Denominator:
Weighted-average common shares outstanding, basic	179,039		177,061		174,427
Effect of dilutive securities:
Common stock held by the NQDC	—		207		—
Weighted-average common shares outstanding, diluted	179,039		177,268		174,427
Net loss per common share, basic	$	(0.13)	$	(0.44)	$	(0.67)
Net loss per common share, diluted	$	(0.13)	$	(0.44)	$	(0.67)

Schedule Of Anti-Dilutive Common Stock Excluded From Computation of Basic and Diluted Net Loss Per Share

The table below presents potential shares of common stock that were excluded from the computation of basic and diluted

loss per common share as they were anti-dilutive (in thousands):

	Years Ended December 31,
	2019	2018	2017
Options to purchase common stock	7,264	7,364	8,108
Common stock issuable under the 2018 Notes	—	—	3,983
Common stock issuable under the 2020 Notes	3,983	3,983	3,983
Common stock issuable under the 2024 Notes	3,970	3,970	3,970
Unvested restricted stock units	3,956	3,404	2,911
Common stock potentially issuable for ESPP purchases	587	435	436
Common stock held by the NQDC	205	—	220
Total number of potentially issuable shares	19,965	19,156	23,611