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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)