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Consolidated Statements Of Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Preferred Shares | Common Shares | Treasury Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ (129,191) | $ 24,364 | $ 149,978 | $ (411) | $ 816,171 | $ (1,119,293)
Balance (in shares) at Dec. 31, 2015 |  | 328,184,640 | 183,577,765 | (174,502) |  |
Balance (Cumulative-effect adjustment) | 1,639 |  |  |  |  | 1,639
Balance at Jan. 01, 2016 | (127,552) | $ 24,364 | $ 149,978 | $ (411) | 816,171 | (1,117,654)
Balance (in shares) at Jan. 01, 2016 |  | 328,184,640 | 183,577,765 | (174,502) |  |
Balance at Dec. 31, 2015 | (129,191) | $ 24,364 | $ 149,978 | $ (411) | 816,171 | (1,119,293)
Balance (in shares) at Dec. 31, 2015 |  | 328,184,640 | 183,577,765 | (174,502) |  |
Issuance of common stock, net of transaction costs | 64,613 |  | $ 15,712 |  | 48,901 |
Issuance of common stock, net of transaction costs (shares) |  |  | 24,265,000 |  |  |
Exchange of exchangeable senior notes, net of transaction costs | 127,436 |  | $ 40,062 |  | 87,374 |
Exchange of exchangeable senior notes, net of transaction costs (in shares) |  |  | 60,311,188 |  |  |
Exercise of stock options | 287 |  | $ 119 |  | 168 |
Exercise of stock options (in shares) |  |  | 177,146 |  |  |
Vesting of restricted stock units | (1,094) |  | $ 1,295 | $ (1,087) | (1,302) |
Vesting of restricted stock units (in shares) |  |  | 1,852,102 | (645,003) |  |
Stock-based compensation | 13,602 |  |  |  | 13,602 |
Loss for the period | (86,350) |  |  |  |  | (86,350)
Balance at Dec. 31, 2016 | (9,058) | $ 24,364 | $ 207,166 | $ (1,498) | 964,914 | (1,204,004)
Balance (in shares) at Dec. 31, 2016 |  | 328,184,640 | 270,183,201 | (819,505) |  |
Exercise of stock options | $ 638 |  | $ 229 |  | 409 |
Exercise of stock options (in shares) | 356,656 |  | 356,656 |  |  |
Vesting of restricted stock units | $ (2,767) |  | $ 1,373 | $ (2,731) | (1,409) |
Vesting of restricted stock units (in shares) |  |  | 2,179,187 | (877,528) |  |
Stock-based compensation | 13,952 |  |  |  | 13,952 |
Loss for the period | (67,865) |  |  |  |  | (67,865)
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 | 264,840 |  | $ 21,744 |  | 243,096 |
Issuance of common stock, net of transaction costs (shares) |  |  | 31,727,550 |  |  |
Issuance of common stock under employee stock purchase plan | 1,043 |  | $ 203 |  | 840 |
Issuance of common stock under employee stock purchase plan (in shares) |  |  | 312,257 |  |  |
Exchange of exchangeable senior notes, net of transaction costs | 29,369 |  | $ 5,011 |  | 24,358 |
Exchange of exchangeable senior notes, net of transaction costs (in shares) |  |  | 7,716,046 |  |  |
Conversion of Series A Convertible Preferred Stock, net | (39) | $ (2,514) | $ 2,514 |  | (39) |
Conversion of Series A Convertible Preferred Stock, net (in shares) |  | (38,867,180) | 3,886,718 |  |  |
Exercise of stock options | $ 26,402 |  | $ 5,309 |  | 21,093 |
Exercise of stock options (in shares) | 8,138,305 |  | 8,138,305 |  |  |
Vesting of restricted stock units | $ (6,184) |  | $ 3,114 | $ (6,184) | (3,114) |
Vesting of restricted stock units (in shares) |  |  | 4,610,943 | (1,563,817) |  |
Stock-based compensation | 18,662 |  |  |  | 18,662 |
Loss for the period | (116,445) |  |  |  |  | (116,445)
Balance at Dec. 31, 2018 | $ 152,330 | $ 21,850 | $ 246,663 | $ (10,413) | $ 1,282,762 | $ (1,388,532)
Balance (in shares) at Dec. 31, 2018 |  | 289,317,460 | 329,110,863 | (3,260,850) |  |

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