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Condensed Consolidated Statement of Changes in Stockholders' Deficit - USD ($) $ in Thousands | Total | Preferred Shares | Common Shares | Treasury Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ (65,100) | $ 24,364 | $ 208,768 | $ (4,229) | $ 977,866 | $ (1,271,869)
Balance (in shares) at Dec. 31, 2017 |  | 328,184,640 | 272,719,044 | (1,697,033) |  |
Balance (Cumulative-effect adjustment) | Accounting Standards Update 2014-09 | (218) |  |  |  |  | (218)
Balance at Jan. 01, 2018 | (65,318) | $ 24,364 | $ 208,768 | $ (4,229) | 977,866 | (1,272,087)
Balance (in shares) at Jan. 01, 2018 |  | 328,184,640 | 272,719,044 | (1,697,033) |  |
Balance at Dec. 31, 2017 | (65,100) | $ 24,364 | $ 208,768 | $ (4,229) | 977,866 | (1,271,869)
Balance (in shares) at Dec. 31, 2017 |  | 328,184,640 | 272,719,044 | (1,697,033) |  |
Issuance of common stock, net of transaction costs | 70,007 |  | $ 14,635 |  | 55,372 |
Issuance of common stock, net of transaction costs (shares) |  |  | 20,616,438 |  |  |
Issuance of common stock under employee stock purchase plan | 423 |  | $ 85 |  | 338 |
Issuance of common stock under employee stock purchase plan (in shares) |  |  | 127,872 |  |  |
Exercise of stock options | $ 1,826 |  | $ 657 |  | 1,169 |
Exercise of stock options (in shares) | 956,232 |  | 956,232 |  |  |
Vesting of restricted stock units | $ (2,680) |  | $ 1,362 | $ (2,680) | (1,362) |
Vesting of restricted stock units (in shares) |  |  | 1,929,317 | (716,494) |  |
Stock-based compensation | 7,360 |  |  |  | 7,360 |
Loss for the period | (58,305) |  |  |  |  | (58,305)
Balance at Jun. 30, 2018 | $ (46,687) | $ 24,364 | $ 225,507 | $ (6,909) | $ 1,040,743 | $ (1,330,392)
Balance (in shares) at Jun. 30, 2018 |  | 328,184,640 | 296,348,903 | (2,413,527) |  |

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