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EMPLOYEE BENEFITS - Summary of the share-based compensation plan (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) shares $ / shares | Dec. 31, 2018 USD ($) shares $ / shares | Dec. 31, 2017 shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | $ 10,129 |  |
Expense | $ 6,288 |  |
Number of stock options (in shares) | shares | 1,051,602 | 1,786,467 | 2,155,851
Number of stock options vested (in shares) | shares | 671,227 |  |
Fair value vested ($) | $ 5,100 |  |
Deferred tax assets | 26,868 | $ 16,916 |
Share-based compensation plan |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Deferred tax assets | $ 11,587 | $ 4,731 |
Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of Restricted Stock Units (in shares) | shares | 622,322 |  |
Fair value at grant date ($) | $ 39,802 |  |
Expense | $ 14,932 |  |
Non-Employees Restricted Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of Restricted Stock Units (in shares) | shares | 2,574 |  |
Fair value at grant date ($) | $ 225 |  |
Expense | $ 179 |  |
Employee and Non Employee Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 85.80 | $ 46.29 |
Number of Restricted Stock Units (in shares) | shares | 624,896 | 535,838 | 164,859
Fair value at grant date ($) | $ 40,027 |  |
Expense | 15,111 |  |
Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 9,881 |  |
Expense | $ 6,226 |  |
Number of stock options (in shares) | shares | 1,024,602 |  |
Number of stock options vested (in shares) | shares | 650,977 |  |
Fair value vested ($) | $ 4,914 |  |
Non-Employees Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 248 |  |
Expense | $ 62 |  |
Number of stock options (in shares) | shares | 27,000 |  |
Number of stock options vested (in shares) | shares | 20,250 |  |
Fair value vested ($) | $ 186 |  |
Exercise Price, $0.95 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 0 |  |
Expense | $ 5 |  |
Exercise price ($ per share) | $ / shares | $ 0.95 |  |
Number of stock options (in shares) | shares | 0 |  |
Number of stock options vested (in shares) | shares | 0 |  |
Fair value vested ($) | $ 0 |  |
Exercise Price, $2.48 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 0 |  |
Expense | $ 9 |  |
Exercise price ($ per share) | $ / shares | $ 2.48 |  |
Number of stock options (in shares) | shares | 0 |  |
Number of stock options vested (in shares) | shares | 0 |  |
Fair value vested ($) | $ 0 |  |
Exercise Price, $3.38 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 0 |  |
Expense | $ 85 |  |
Exercise price ($ per share) | $ / shares | $ 3.38 |  |
Number of stock options (in shares) | shares | 0 |  |
Number of stock options vested (in shares) | shares | 0 |  |
Fair value vested ($) | $ 0 |  |
Exercise Price, $12.22 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 0 |  |
Expense | $ 0 |  |
Exercise price ($ per share) | $ / shares | $ 12.22 |  |
Number of stock options (in shares) | shares | 0 |  |
Number of stock options vested (in shares) | shares | 0 |  |
Fair value vested ($) | $ 0 |  |
Exercise Price, $10.00 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 359 |  |
Expense | $ 500 |  |
Exercise price ($ per share) | $ / shares | $ 10.00 |  |
Number of stock options (in shares) | shares | 107,826 |  |
Number of stock options vested (in shares) | shares | 107,826 |  |
Fair value vested ($) | $ 359 |  |
Exercise Price, $22.77 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 0 |  |
Expense | $ 0 |  |
Exercise price ($ per share) | $ / shares | $ 22.77 |  |
Number of stock options (in shares) | shares | 0 |  |
Number of stock options vested (in shares) | shares | 0 |  |
Fair value vested ($) | $ 0 |  |
Exercise Price, $28.31 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 1,426 |  |
Expense | $ 1,422 |  |
Exercise price ($ per share) | $ / shares | $ 28.31 |  |
Number of stock options (in shares) | shares | 205,748 |  |
Number of stock options vested (in shares) | shares | 205,748 |  |
Fair value vested ($) | $ 1,426 |  |
Exercise Price, $29.34 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 26 |  |
Expense | $ 0 |  |
Exercise price ($ per share) | $ / shares | $ 29.34 |  |
Number of stock options (in shares) | shares | 3,875 |  |
Number of stock options vested (in shares) | shares | 3,875 |  |
Fair value vested ($) | $ 26 |  |
Exercise Price, $34.20 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 47 |  |
Expense | $ 39 |  |
Exercise price ($ per share) | $ / shares | $ 34.20 |  |
Number of stock options (in shares) | shares | 5,500 |  |
Number of stock options vested (in shares) | shares | 5,500 |  |
Fair value vested ($) | $ 47 |  |
Exercise Price, $29.01 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 810 |  |
Expense | $ 888 |  |
Exercise price ($ per share) | $ / shares | $ 29.01 |  |
Number of stock options (in shares) | shares | 117,480 |  |
Number of stock options vested (in shares) | shares | 52,480 |  |
Fair value vested ($) | $ 362 |  |
Exercise Price, $32.36 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 2,740 |  |
Expense | $ 1,487 |  |
Exercise price ($ per share) | $ / shares | $ 32.36 |  |
Number of stock options (in shares) | shares | 338,173 |  |
Number of stock options vested (in shares) | shares | 211,798 |  |
Fair value vested ($) | $ 1,716 |  |
Exercise Price, $38.16 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 273 |  |
Expense | $ 91 |  |
Exercise price ($ per share) | $ / shares | $ 38.16 |  |
Number of stock options (in shares) | shares | 30,000 |  |
Number of stock options vested (in shares) | shares | 20,000 |  |
Fair value vested ($) | $ 182 |  |
Exercise Price, $36.30 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 127 |  |
Expense | $ 32 |  |
Exercise price ($ per share) | $ / shares | $ 36.30 |  |
Number of stock options (in shares) | shares | 15,000 |  |
Number of stock options vested (in shares) | shares | 7,500 |  |
Fair value vested ($) | $ 64 |  |
Exercise Price, $44.97 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 268 |  |
Expense | $ 118 |  |
Exercise price ($ per share) | $ / shares | $ 44.97 |  |
Number of stock options (in shares) | shares | 15,000 |  |
Number of stock options vested (in shares) | shares | 0 |  |
Fair value vested ($) | $ 0 |  |
Exercise Price, $46.00 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 3,434 |  |
Expense | $ 1,349 |  |
Exercise price ($ per share) | $ / shares | $ 46.00 |  |
Number of stock options (in shares) | shares | 170,000 |  |
Number of stock options vested (in shares) | shares | 36,250 |  |
Fair value vested ($) | $ 732 |  |
Exercise Price, $55.07 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 181 |  |
Expense | $ 97 |  |
Exercise price ($ per share) | $ / shares | $ 55.07 |  |
Number of stock options (in shares) | shares | 7,500 |  |
Number of stock options vested (in shares) | shares | 0 |  |
Fair value vested ($) | $ 0 |  |
Exercise Price, $50.92 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 101 |  |
Expense | $ 61 |  |
Exercise price ($ per share) | $ / shares | $ 50.92 |  |
Number of stock options (in shares) | shares | 4,500 |  |
Number of stock options vested (in shares) | shares | 0 |  |
Fair value vested ($) | $ 0 |  |
Exercise Price, $52.10 | Employee Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 89 |  |
Expense | $ 43 |  |
Exercise price ($ per share) | $ / shares | $ 52.10 |  |
Number of stock options (in shares) | shares | 4,000 |  |
Number of stock options vested (in shares) | shares | 0 |  |
Fair value vested ($) | $ 0 |  |
Exercise Price, $39.37 | Non-Employees Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Fair value at grant date ($) | 248 |  |
Expense | $ 62 |  |
Exercise price ($ per share) | $ / shares | $ 39.37 |  |
Number of stock options (in shares) | shares | 27,000 |  |
Number of stock options vested (in shares) | shares | 20,250 |  |
Fair value vested ($) | $ 186 |  |
Grant Price, $36.30 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 36.30 |  |
Number of Restricted Stock Units (in shares) | shares | 1,000 |  |
Fair value at grant date ($) | $ 36 |  |
Expense | $ 18 |  |
Grant Price, $37.00 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 37.00 |  |
Number of Restricted Stock Units (in shares) | shares | 45,242 |  |
Fair value at grant date ($) | $ 1,674 |  |
Expense | $ 2,217 |  |
Grant Price, $42.00 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 42.00 |  |
Number of Restricted Stock Units (in shares) | shares | 3,250 |  |
Fair value at grant date ($) | $ 137 |  |
Expense | $ 77 |  |
Grant Price, $46.00 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 46.00 |  |
Number of Restricted Stock Units (in shares) | shares | 281,180 |  |
Fair value at grant date ($) | $ 12,934 |  |
Expense | $ 5,221 |  |
Grant Price, $46.00 | Non-Employees Restricted Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 46.00 |  |
Number of Restricted Stock Units (in shares) | shares | 0 |  |
Fair value at grant date ($) | $ 0 |  |
Expense | $ 35 |  |
Grant Price, $50.92 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 50.92 |  |
Number of Restricted Stock Units (in shares) | shares | 7,500 |  |
Fair value at grant date ($) | $ 382 |  |
Expense | $ 129 |  |
Grant Price, $52.74 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 52.74 |  |
Number of Restricted Stock Units (in shares) | shares | 3,000 |  |
Fair value at grant date ($) | $ 158 |  |
Expense | $ 54 |  |
Grant Price, $55.07 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 55.07 |  |
Number of Restricted Stock Units (in shares) | shares | 3,000 |  |
Fair value at grant date ($) | $ 165 |  |
Expense | $ 56 |  |
Grant Price, $56.87 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 56.87 |  |
Number of Restricted Stock Units (in shares) | shares | 0 |  |
Fair value at grant date ($) | $ 0 |  |
Expense | $ 67 |  |
Grant Price, $52.10 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 52.10 |  |
Number of Restricted Stock Units (in shares) | shares | 2,400 |  |
Fair value at grant date ($) | $ 125 |  |
Expense | $ 61 |  |
Grant Price, $87.44 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 87.44 |  |
Number of Restricted Stock Units (in shares) | shares | 268,750 |  |
Fair value at grant date ($) | $ 23,500 |  |
Expense | $ 6,450 |  |
Grant Price, $94.93 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 94.93 |  |
Number of Restricted Stock Units (in shares) | shares | 4,000 |  |
Fair value at grant date ($) | $ 380 |  |
Expense | $ 116 |  |
Grant Price, $69.77 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 69.77 |  |
Number of Restricted Stock Units (in shares) | shares | 0 |  |
Fair value at grant date ($) | $ 0 |  |
Expense | $ 446 |  |
Grant Price, $103.75 | Restricted Stock Units |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 103.75 |  |
Number of Restricted Stock Units (in shares) | shares | 3,000 |  |
Fair value at grant date ($) | $ 311 |  |
Expense | $ 20 |  |
Grant Price, $57.39 | Non-Employees Restricted Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 57.39 |  |
Number of Restricted Stock Units (in shares) | shares | 0 |  |
Fair value at grant date ($) | $ 0 |  |
Expense | $ 18 |  |
Grant Price, $87.44 | Non-Employees Restricted Stock Options |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Grant price (in usd per share) | $ / shares | $ 87.44 |  |
Number of Restricted Stock Units (in shares) | shares | 2,574 |  |
Fair value at grant date ($) | $ 225 |  |
Expense | $ 126 |  |

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