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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator:        
Net income (loss) to common stockholders $ (7,619) $ (4,237) $ 27,713 $ 4,958
Denominator:        
Weighted-average common shares, basic (in shares) 27,247,462 27,327,936 27,488,437 24,588,296
Weighted-average common shares, diluted (in shares) 27,247,462 27,327,936 28,417,453 26,138,201
Net income (loss) per common share:        
Basic (in dollars per share) $ (0.28) $ (0.16) $ 1.01 $ 0.20
Diluted (in dollars per share) $ (0.28) $ (0.16) $ 0.98 $ 0.19
Antidilutive securities (in shares) 5,472,963 4,438,059 3,106,309 3,443,365
Restricted stock units        
Net income (loss) per common share:        
Antidilutive securities (in shares)     209,689 426,046
Stock options        
Net income (loss) per common share:        
Securities that are potentially dilutive to earnings per share (in shares)     719,327 1,087,859