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v3.20.4

Consolidated Statements of Shareholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands | Total | Ordinary shares | Preferred Stock | Additional paid-in capital | Accumulated deficit | Accumulated other comprehensive loss | Treasury Shares
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  | 41,463 | 0 |  |  |  | 2,117
Beginning balance at Dec. 31, 2017 | $ 85,580 | $ 414 | $ 0 | $ 393,478 | $ (262,685) | $ (23,266) | $ (22,361)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | (95,304) |  |  |  | (95,304) |  |
Other comprehensive income (loss) | (150) |  |  |  |  | (150) |
Exercise of stock options (in shares) |  | 82 |  |  |  |  |
Exercise of stock options | 535 | $ 1 |  | 534 |  |  |
Exercise of warrants (in shares) |  | 603 |  |  |  |  |
Exercise of warrants | 2,911 | $ 6 |  | 2,905 |  |  |
Expiration of warrants | 2,167 |  |  | 2,167 |  |  |
Vesting of restricted shares (in shares) |  | 547 |  |  |  |  |
Vesting of restricted shares | 0 | $ 6 |  | (6) |  |  |
Employee share purchase plan share issuance (in shares) |  | 25 |  |  |  |  |
Employee share purchase plan share issuance | 127 |  |  | 127 |  |  |
Share-based compensation expense | 7,852 |  |  | 7,852 |  |  |
Equity component of 2023 Notes | 26,699 |  |  | 26,699 |  |  |
Share repurchases (in shares) |  |  |  |  |  |  | 3,290
Share repurchases | (27,637) |  |  |  |  |  | $ (27,637)
Ending balance (in shares) at Dec. 31, 2018 |  | 42,720 | 0 |  |  |  | 5,407
Ending balance at Dec. 31, 2018 | 2,780 | $ 427 | $ 0 | 433,756 | (357,989) | (23,416) | $ (49,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | (33,226) |  |  |  | (33,226) |  |
Other comprehensive income (loss) | 610 |  |  |  |  | 610 |
Vesting of restricted shares (in shares) |  | 153 |  |  |  |  |
Vesting of restricted shares | 0 | $ 2 |  | (2) |  |  |
Employee share purchase plan share issuance (in shares) |  | 54 |  |  |  |  |
Employee share purchase plan share issuance | 118 |  |  | 118 |  |  |
Share-based compensation expense | 519 |  |  | 519 |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  | 42,927 | 0 |  |  |  | 5,407
Ending balance at Dec. 31, 2019 | (29,199) | $ 429 | $ 0 | 434,391 | (391,215) | (22,806) | $ (49,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 7,028 |  |  |  | 7,028 |  |
Other comprehensive income (loss) | $ 1,755 |  |  |  |  | 1,755 |
Exercise of stock options (in shares) | 403 | 403 |  |  |  |  |
Exercise of stock options | $ 2,045 | $ 4 |  | 2,041 |  |  |
February 2020 private placement (in shares) |  | 8,680 | 488 |  |  |  |
February 2020 private placement | 60,570 | $ 87 | $ 5 | 60,478 |  |  |
May 2020 public offering (in shares) |  | 11,630 |  |  |  |  |
May 2020 public offering | 116,924 | $ 116 |  | 116,808 |  |  |
Vesting of restricted shares (in shares) |  | 114 |  |  |  |  |
Vesting of restricted shares | 0 | $ 1 |  | (1) |  |  |
Employee share purchase plan share issuance (in shares) |  | 49 |  |  |  |  |
Employee share purchase plan share issuance | 144 |  |  | 144 |  |  |
Share-based compensation expense | 2,999 |  |  | 2,999 |  |  |
Retirement of treasury shares (in shares) |  | (5,407) |  |  |  |  | (5,407)
Retirement of treasury shares | 0 | $ (54) |  | (49,944) |  |  | $ (49,998)
Ending balance (in shares) at Dec. 31, 2020 |  | 58,396 | 488 |  |  |  | 0
Ending balance at Dec. 31, 2020 | $ 162,266 | $ 583 | $ 5 | $ 566,916 | $ (384,187) | $ (21,051) | $ 0

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