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Condensed consolidated balance sheets (Parenthetical) - $ / shares
Mar. 31, 2018
Dec. 31, 2017
Common Stock, Par Value Per Share $ 0.001 $ 0.001
Common Stock, Shares Authorized 500,000,000 500,000,000
Common Stock, Shares, Issued 26,376,023 26,367,523
Common Stock, Shares, Outstanding 26,231,817 26,223,317