NET LOSS PER COMMON SHARE (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

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

The table below presents potential shares of common stock that were excluded from the computation of diluted earnings per common share as they were anti-dilutive using the if-converted or treasury stock method (in thousands of common shares): 

	Three and Six Months Ended June 30,
	2019	2018
Options to purchase common stock	7,494	7,829
Common stock issuable under the 2018 Notes	—	3,983
Common stock issuable under the 2020 Notes	3,983	3,983
Common stock issuable under the 2024 Notes	3,970	3,970
Unvested restricted stock units	4,108	3,544
Common stock potentially issuable for ESPP purchases	482	433
Common stock held by the NQDC	211	208
Total number of potentially issuable shares	20,248	23,950