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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Ordinary shares | Additional paid-in capital | Accumulated other comprehensive loss | Retained earnings (accumulated deficit)
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 |  | $ 113,564 |  | $ 697,165 | $ (1,343) | $ (582,258)
Beginning balance (in shares) at Dec. 31, 2017 |  |  | 89,478,032 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation to employees |  | 8,520 |  | 8,520 |  |
Exercise of options and warrants and vested RSUs |  | 2,581 |  | 2,581 |  |
Exercise of options and warrants and vested RSUs (in shares) |  |  | 920,869 |  |  |
Cumulative effect adjustment on retained earnings | [1] | 2,162 |  |  |  | 2,162
Other comprehensive income (loss), net of tax benefit |  | 15 |  |  | 15 |
Net income (loss) |  | (20,724) |  |  |  | (20,724)
Ending balance at Mar. 31, 2018 |  | 106,118 |  | 708,266 | (1,328) | (600,820)
Ending balance (in shares) at Mar. 31, 2018 |  |  | 90,398,901 |  |  |
Beginning balance at Dec. 31, 2017 |  | 113,564 |  | 697,165 | (1,343) | (582,258)
Beginning balance (in shares) at Dec. 31, 2017 |  |  | 89,478,032 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | (47,928) |  |  |  |
Ending balance at Sep. 30, 2018 |  | 114,936 |  | 744,087 | (1,127) | (628,024)
Ending balance (in shares) at Sep. 30, 2018 |  |  | 93,007,844 |  |  |
Beginning balance at Dec. 31, 2017 |  | 113,564 |  | 697,165 | (1,343) | (582,258)
Beginning balance (in shares) at Dec. 31, 2017 |  |  | 89,478,032 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | (63,559) |  |  |  |
Ending balance at Dec. 31, 2018 |  | 112,259 |  | 757,314 | (1,400) | (643,655)
Ending balance (in shares) at Dec. 31, 2018 |  |  | 93,254,185 |  |  |
Beginning balance at Mar. 31, 2018 |  | 106,118 |  | 708,266 | (1,328) | (600,820)
Beginning balance (in shares) at Mar. 31, 2018 |  |  | 90,398,901 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation to employees |  | 10,206 |  | 10,206 |  |
Proceeds from issuance of shares |  | 938 |  | 938 |  |
Proceeds from issuance of shares (in shares) |  |  | 54,386 |  |  |
Exercise of options and warrants and vested RSUs |  | 10,274 |  | 10,274 |  |
Exercise of options and warrants and vested RSUs (in shares) |  |  | 2,049,986 |  |  |
Other comprehensive income (loss), net of tax benefit |  | 55 |  |  | 55 |
Net income (loss) |  | (15,510) |  |  |  | (15,510)
Ending balance at Jun. 30, 2018 |  | 112,081 |  | 729,684 | (1,273) | (616,330)
Ending balance (in shares) at Jun. 30, 2018 |  |  | 92,503,273 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation to employees |  | 10,479 |  | 10,479 |  |
Exercise of options and warrants and vested RSUs |  | 3,924 |  | 3,924 |  |
Exercise of options and warrants and vested RSUs (in shares) |  |  | 504,571 |  |  |
Other comprehensive income (loss), net of tax benefit |  | 146 |  |  | 146 |
Net income (loss) |  | (11,694) |  |  |  | (11,694)
Ending balance at Sep. 30, 2018 |  | 114,936 |  | 744,087 | (1,127) | (628,024)
Ending balance (in shares) at Sep. 30, 2018 |  |  | 93,007,844 |  |  |
Beginning balance at Dec. 31, 2018 |  | 112,259 |  | 757,314 | (1,400) | (643,655)
Beginning balance (in shares) at Dec. 31, 2018 |  |  | 93,254,185 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation to employees |  | 9,649 |  | 9,649 |  |
Exercise of options and warrants and vested RSUs |  | 16,978 |  | 16,978 |  |
Exercise of options and warrants and vested RSUs (in shares) |  |  | 2,438,612 |  |  |
Other comprehensive income (loss), net of tax benefit |  | (342) |  |  | (342) |
Net income (loss) |  | (12,150) |  |  |  | (12,150)
Ending balance at Mar. 31, 2019 |  | 126,394 |  | 783,941 | (1,742) | (655,805)
Ending balance (in shares) at Mar. 31, 2019 |  |  | 95,692,797 |  |  |
Beginning balance at Dec. 31, 2018 |  | 112,259 |  | 757,314 | (1,400) | (643,655)
Beginning balance (in shares) at Dec. 31, 2018 |  |  | 93,254,185 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | (11,490) |  |  |  |
Ending balance at Sep. 30, 2019 |  | 190,365 |  | 848,151 | (2,641) | (655,145)
Ending balance (in shares) at Sep. 30, 2019 |  |  | 98,948,935 |  |  |
Beginning balance at Mar. 31, 2019 |  | 126,394 |  | 783,941 | (1,742) | (655,805)
Beginning balance (in shares) at Mar. 31, 2019 |  |  | 95,692,797 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation to employees |  | 13,732 |  | 13,732 |  |
Proceeds from issuance of shares |  | 1,208 |  | 1,208 |  |
Proceeds from issuance of shares (in shares) |  |  | 43,421 |  |  |
Exercise of options and warrants and vested RSUs |  | 19,457 |  | 19,457 |  |
Exercise of options and warrants and vested RSUs (in shares) |  |  | 2,122,658 |  |  |
Other comprehensive income (loss), net of tax benefit |  | (615) |  |  | (615) |
Net income (loss) |  | (1,270) |  |  |  | (1,270)
Ending balance at Jun. 30, 2019 |  | 158,906 |  | 818,338 | (2,357) | (657,075)
Ending balance (in shares) at Jun. 30, 2019 |  |  | 97,858,876 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation to employees |  | 14,338 |  | 14,338 |  |
Exercise of options and warrants and vested RSUs |  | 15,475 |  | 15,475 |  |
Exercise of options and warrants and vested RSUs (in shares) |  |  | 1,090,059 |  |  |
Other comprehensive income (loss), net of tax benefit |  | (284) |  |  | (284) |
Net income (loss) |  | 1,930 |  |  |  | 1,930
Ending balance at Sep. 30, 2019 |  | $ 190,365 |  | $ 848,151 | $ (2,641) | $ (655,145)
Ending balance (in shares) at Sep. 30, 2019 |  |  | 98,948,935 |  |  |
[1] | Resulting from the adoption of ASC 606.

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