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Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Loss | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Common shares outstanding, beginning balance (in shares) at Dec. 31, 2016 |  | 89,405,480 |  |  |
Balance, beginning of the year at Dec. 31, 2016 | $ 410,476 | $ 468,494 | $ 27,009 | $ (1,818) | $ (83,209)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options (in shares) | 3,322,993 | 3,322,993 |  |  |
Exercise of stock options | $ 14,774 | $ 24,959 | (10,185) |  |
Stock-based compensation | 50,535 |  | 50,535 |  |
Vesting of restricted shares (in shares) |  | 824,215 |  |  |
Vesting of restricted share units | 0 | $ 23,967 | (23,967) |  |
Issuance of Class A subordinate voting shares, net of offering costs (in shares) |  | 6,325,000 |  |  |
Issuance of Class A subordinate voting shares, net of offering costs | 560,057 | $ 560,057 |  |  |
Net loss and comprehensive loss for the year | (34,742) |  |  | 5,253 | (39,995)
Common shares outstanding, ending balance (in shares) at Dec. 31, 2017 |  | 99,877,688 |  |  |
Balance, end of the year at Dec. 31, 2017 | $ 1,001,100 | $ 1,077,477 | 43,392 | 3,435 | (123,204)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options (in shares) | 2,179,999 | 2,179,999 |  |  |
Exercise of stock options | $ 30,494 | $ 48,408 | (17,914) |  |
Stock-based compensation | 97,690 |  | 97,690 |  |
Vesting of restricted shares (in shares) |  | 935,002 |  |  |
Vesting of restricted share units | 0 | $ 48,363 | (48,363) |  |
Issuance of Class A subordinate voting shares, net of offering costs (in shares) |  | 7,400,000 |  |  |
Issuance of Class A subordinate voting shares, net of offering costs | 1,041,688 | $ 1,041,688 |  |  |
Net loss and comprehensive loss for the year | (80,204) |  |  | (15,651) | (64,553)
Common shares outstanding, ending balance (in shares) at Dec. 31, 2018 |  | 110,392,689 |  |  |
Balance, end of the year at Dec. 31, 2018 | $ 2,090,768 | $ 2,215,936 | $ 74,805 | $ (12,216) | $ (187,757)

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