EARNINGS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Schedule of Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations

The following table sets forth the computation of the basic and diluted net income (loss) per share:

	Year ended December 31,
(in thousands, except per share amounts)	2021		2020		2019
Numerator:
Net income (loss)	$	13,254	$	(29,271)	$	(5,924)
Denominator:
Weighted average number of shares outstanding:
Basic	101,484		96,971		89,575
2020 Notes	2,175		—		—
2024 Notes	653		—		—
Stock options	292		—		—
Restricted stock units	1,525		—		—
Stock purchase rights under ESPP	42		—		—
Diluted	106,171		96,971		89,575
Net income (loss) per share:
Basic	$	0.13	$	(0.30)	$	(0.07)
Diluted	$	0.12	$	(0.30)	$	(0.07)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table presents the potentially dilutive shares that were excluded from the computation of diluted net income (loss) per share, because their effect was anti-dilutive:

	Year ended December 31,
(in thousands)	2021	2020	2019
2020 Notes	—	312	1,322
2022 Notes	—	192	n/a
Stock options	8	1,603	2,568
Restricted stock units	27	3,041	2,955
Stock purchase rights under the ESPP	390	531	478
Warrants (1)	—	—	4,321
Total	425	5,679	11,644

(1) Refer to Note 15, “Warrants,” for additional information.