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STOCKHOLDRES' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
9 Months Ended
Mar. 22, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]          
Proceeds from public offering of common stock, net of issuance costs   $ 32,509 $ 0    
Stockholders' equity   $ 152,876   $ 112,757 $ 109,350
Common Stock [Member]          
Class of Stock [Line Items]          
Stock issued (in shares) 1.6        
Share price (usd per share) $ 21.25        
Proceeds from public offering of common stock, net of issuance costs $ 32,500