Annual report pursuant to Section 13 and 15(d)

NET (LOSS) INCOME PER SHARE - Calculation of Net Income Per Share (Details)

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NET (LOSS) INCOME PER SHARE - Calculation of Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Dec. 31, 2019
Numerator (both basic and diluted)                      
Net (loss) income relevant to common stockholders $ (20,232) $ (5,067) $ (8,511) $ (20,375) $ (44,112) $ (29,184) $ (25,920) $ (7,804) $ (54,185) $ (107,020) $ 163,010
Denominator                      
Denominator for basic net (loss) income per share (in shares) 103,390 103,257 102,398 101,550 100,911 100,897 100,821 100,687 102,655 100,829 100,472
Denominator for diluted net (loss) income per share (in shares) 103,390 103,257 102,398 101,550 100,911 100,897 100,821 100,687 102,655 100,829 103,750
Basic net (loss) income per common share (in dollars per share) $ (0.20) $ (0.05) $ (0.08) $ (0.20) $ (0.44) $ (0.29) $ (0.26) $ (0.08) $ (0.53) $ (1.06) $ 1.62
Diluted net (loss) income per common share (in dollars per share) $ (0.20) $ (0.05) $ (0.08) $ (0.20) $ (0.44) $ (0.29) $ (0.26) $ (0.08) $ (0.53) $ (1.06) $ 1.57
Stock options                      
Denominator                      
Dilutive effect of stock options/units (in shares)                 0 0 2,929
Performance stock units                      
Denominator                      
Dilutive effect of stock options/units (in shares)                 0 0 169
Restricted stock units                      
Denominator                      
Dilutive effect of stock options/units (in shares)                 0 0 179