Quarterly report pursuant to Section 13 or 15(d)

COMMON AND PREFERRED STOCK - Additional Information (Details)

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COMMON AND PREFERRED STOCK - Additional Information (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Aug. 15, 2016
shares
Mar. 31, 2017
shares
May 31, 2016
shares
Sep. 30, 2017
USD ($)
Class
$ / shares
shares
Dec. 31, 2015
shares
Dec. 31, 2016
$ / shares
shares
Apr. 30, 2016
shares
May 31, 2011
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage increase of authorized shares     50.00%          
Common Stock, shares authorized (in shares)     142,500,000 142,500,000   142,500,000 95,000,000  
Total shares of preferred and common stock authorized for issuance (in shares)       147,500,000        
Number of classes of shares | Class       2        
Common stock, par value (in dollars per share) | $ / shares       $ 0.001   $ 0.001    
Preferred stock, shares authorized (in shares)       5,000,000   5,000,000    
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.001   $ 0.001    
Stock Activity [Abstract]                
Common stock surrendered by certain employees to cover tax obligations (in shares)       200,932        
Fair value of common stock surrendered by certain employees to cover tax obligations | $       $ 500,000        
Shares forfeited (in shares)       200,932 375,875      
Stock Repurchase Program [Abstract]                
Stock repurchase program, amount approved | $               $ 150,000,000
Common Stock [Member] | Chief Executive Officer [Member]                
Stock Activity [Abstract]                
Shares forfeited (in shares) 3,000,000 85,383