NET INCOME (LOSS) PER SHARE - Tabular Disclosure (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Basic
Net loss	$ (1,683)	$ (8,323)
Undistributed earnings allocated to participating securities	0	0
Net loss attributable to common stockholders—basic	$ (1,683)	$ (8,323)
Weighted average shares used in computing net income (loss) per share attributable to common stockholders - basic (in shares)	149,183	147,774
Net (loss) income per share attributable to common stockholders - basic (in dollars per share)	$ (0.01)	$ (0.06)
Diluted
Net loss attributable to common stockholders—diluted	$ (1,683)	$ (8,323)
Effect of dilutive securities (in shares)	0	0
Weighted average shares used in computing net income (loss) per share attributable to common stockholders - diluted (in shares)	149,183	147,774
Net income (loss) per share attributable to common stockholders - diluted (in dollars per share)	$ (0.01)	$ (0.06)