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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2018
Dec. 31, 2017
[1]
Preferred stock    
Par value (in dollars per share) $ 0.001 $ 0.001
Shares authorized (in shares) 10,000,000 10,000,000
Shares issued (in shares) 0 0
Common stock    
Par value (in dollars per share) $ 0.001 $ 0.001
Shares authorized (in shares) 400,000,000 400,000,000
Shares issued (in shares) 296,694,330 296,209,426
Shares outstanding (in shares) 296,694,330 296,209,426
[1] The Condensed Consolidated Balance Sheet as of December 31, 2017 has been derived from the audited financial statements as of that date.