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Consolidated Balance Sheets Parenthetical - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 50,000,000 200,000,000
Common stock, shares outstanding (in shares) 15,098,837 8,895,094