EARNINGS PER SHARE - Schedule of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 13,254	$ (29,271)	$ (5,924)
Basic (in shares)	101,484	96,971	89,575
Diluted (in shares)	106,171	96,971	89,575
Basic (in dollars per share)	$ 0.13	$ (0.30)	$ (0.07)
Diluted (in dollars per share)	$ 0.12	$ (0.30)	$ (0.07)
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number diluted shares outstanding adjustment (in shares)	292	0	0
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number diluted shares outstanding adjustment (in shares)	1,525	0	0
Stock purchase rights under the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number diluted shares outstanding adjustment (in shares)	42	0	0
2020 Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number diluted shares outstanding adjustment (in shares)	2,175	0	0
2024 Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number diluted shares outstanding adjustment (in shares)	653	0	0