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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 |  |

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