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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      
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 $ 16,494   $ 3,589   12,905  
Exercise of stock options (in shares) 5,439,239   5,439,239      
Vesting of restricted stock units $ (5,638)   $ 3,055 $ (5,638) (3,055)  
Vesting of restricted stock units (in shares)     4,520,005 (1,522,565)    
Stock-based compensation 14,021       14,021  
Loss for the period (82,776)         (82,776)
Balance at Sep. 30, 2018 $ (52,826) $ 21,850 $ 232,646 $ (9,867) $ 1,057,408 $ (1,354,863)
Balance (in shares) at Sep. 30, 2018   289,317,460 307,309,316 (3,219,598)