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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      
Exercise of stock options $ 1,548   $ 541   1,007  
Exercise of stock options (in shares) 782,553   782,553      
Vesting of restricted stock units $ (2,553)   $ 1,302 $ (2,553) (1,302)  
Vesting of restricted stock units (in shares)     1,838,380 (675,242)    
Stock-based compensation 3,754       3,754  
Loss for the period (24,095)         (24,095)
Balance at Mar. 31, 2018 $ (16,657) $ 24,364 $ 225,246 $ (6,782) $ 1,036,697 $ (1,296,182)
Balance (in shares) at Mar. 31, 2018   328,184,640 295,956,415 (2,372,275)