ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
BASIC NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS
Net (loss) income attributable to common stockholders	$ (12,772)	$ 5,359	$ (34,539)	$ 8,846
Denominator:
Denominator for basic net (loss) income per share - weighted average outstanding shares	44,175,385	44,315,077	44,738,635	44,912,673
Effect of dilutive securities:
Stock options and restricted stock	0	1,803,625	0	2,052,572
Denominator for diluted net (loss) income per share - weighted-average outstanding shares	44,175,385	46,118,702	44,738,635	46,965,245
Net loss attributable to common stockholders per share - basic and diluted	$ (0.29)	$ 0.12	$ (0.77)	$ 0.20
Net (loss) income attributable to common stockholders per share - basic	(0.29)	0.12	(0.77)	0.20
Net (loss) income attributable to common stockholders per share -diluted	$ (0.29)	$ 0.12	$ (0.77)	$ 0.19