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Prior-Period Financial Statements - Balance Sheet Stock Information (Details) - $ / shares
Sep. 30, 2018
Dec. 31, 2017
Condensed Balance Sheets    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 56,212,449 47,002,488
Common stock, shares outstanding 56,212,449 47,002,488