Quarterly report pursuant to Section 13 or 15(d)

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Earnings Per Share, Basic and Diluted (Details)

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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:        
Net income (loss) to common stockholders $ (2,580) $ (7,619) $ (10,552) $ 27,713
Denominator:        
Weighted-average common shares, basic (in shares) 27,623,768 27,247,462 27,609,176 27,488,437
Weighted-average common shares, diluted (in shares) 27,623,768 27,247,462 27,609,176 28,417,453
Net income (loss) per common share:        
Basic (in dollars per share) $ (0.09) $ (0.28) $ (0.38) $ 1.01
Diluted (in dollars per share) $ (0.09) $ (0.28) $ (0.38) $ 0.98
Antidilutive securities (in shares) 5,223,557 5,472,963 5,223,557 3,106,309
Restricted stock units        
Net income (loss) per common share:        
Antidilutive securities (in shares)       209,689
Stock options        
Net income (loss) per common share:        
Securities that are potentially dilutive to earnings per share (in shares)       719,327