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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)