ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share
Net income (loss) attributable to common stockholders	$ 6,603	$ 13,876	$ 17,866	$ 7	$ 26,426	$ (12,772)	$ 1,420	$ (23,187)	$ 38,352	$ (8,113)
Denominator:
Denominator for basic net income (loss) per share - weighted average outstanding shares	51,206,358	51,190,105	49,789,892	48,463,289	45,942,818	44,175,385	44,806,219	45,228,164	50,163,600	45,041,467
Effect of dilutive securities:
Stock options and restricted stock									3,973,041
Denominator for diluted net income (loss) per share - weighted-average outstanding shares	55,084,927	55,080,394	53,780,918	49,053,650	48,054,418	44,175,385	48,154,262	45,228,164	54,136,641	45,041,467
Net income (loss) attributable to common stockholders per share - basic	$ 0.13	$ 0.27	$ 0.36	$ 0.00	$ 0.58	$ (0.29)	$ 0.03	$ (0.51)	$ 0.76	$ (0.18)
Net income (loss) attributable to common stockholders per share -diluted	$ 0.12	$ 0.25	$ 0.33	$ 0.00	$ 0.55	$ (0.29)	$ 0.03	$ (0.51)	$ 0.71	$ (0.18)