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COMMON STOCK (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 14, 2019
$ / shares
shares
Mar. 30, 2018
shares
Mar. 14, 2017
$ / shares
shares
Aug. 31, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
Vote
$ / shares
shares
Sep. 30, 2018
shares
Sep. 30, 2019
USD ($)
Vote
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Dec. 31, 2018
$ / shares
shares
Class of Stock [Abstract]                  
Gross proceeds of common stock | $             $ 26,463 $ 0  
SMC [Member]                  
Class of Stock [Abstract]                  
Stock price (in dollars per share) | $ / shares     $ 7.50            
Common Class A [Member]                  
Class of Stock [Abstract]                  
Common stock, shares authorized (in shares)         50,000,000   50,000,000   50,000,000
Common stock, par value (in dollars per share) | $ / shares         $ 0.0001   $ 0.0001   $ 0.0001
Number of votes for each share entitled | Vote         1   1    
Common stock, shares issued (in shares)         16,179,058   16,179,058   14,110,315
Number of shares sold (in shares)       2,053,572          
Stock price (in dollars per share) | $ / shares       $ 14.00          
Gross proceeds of common stock | $       $ 28,750          
Underwriting discount and offering expenses | $       $ 2,287          
Common stock, shares outstanding (in shares)         16,179,058   16,179,058   14,110,315
Common Class A [Member] | SMC [Member]                  
Class of Stock [Abstract]                  
Exercise of common stock warrant issued (in shares)   397,502              
Number of shares sold (in shares)     397,502            
Stock price (in dollars per share) | $ / shares $ 13.195                
Number of shares repurchased (in shares) 214,286                
Common Class A [Member] | Common Stock [Member]                  
Class of Stock [Abstract]                  
Exercise of common stock warrant issued (in shares)               397,502  
Stock issued upon exercise of stock options (in shares)         89,015 110,976 193,642 245,702  
Conversion of class B common shares to Class A common shares (in shares)         20,815 1,750 35,815 491,315  
Number of shares sold (in shares)         2,053,572   2,053,572    
Number of shares repurchased (in shares)         214,286   214,286    
Common Class B [Member]                  
Class of Stock [Abstract]                  
Common stock, shares authorized (in shares)         2,409,738   2,409,738   2,409,738
Common stock, par value (in dollars per share) | $ / shares         $ 0.0001   $ 0.0001   $ 0.0001
Number of votes for each share entitled | Vote         20   20    
Convertible shares in to Class A common stock (in shares)             1    
Common stock, shares issued (in shares)         1,862,608   1,862,608   1,898,423
Common stock, shares outstanding (in shares)         1,862,608   1,862,608   1,898,423
Common Class B [Member] | Common Stock [Member]                  
Class of Stock [Abstract]                  
Exercise of common stock warrant issued (in shares)               0  
Stock issued upon exercise of stock options (in shares)         0 0 0 0  
Conversion of class B common shares to Class A common shares (in shares)         (20,815) (1,750) (35,815) (491,315)  
Number of shares sold (in shares)         0   0    
Number of shares repurchased (in shares)         0   0