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Condensed consolidated balance sheets (Parenthetical) - $ / shares
Mar. 31, 2017
Dec. 31, 2016
Common Stock, Par Value Per Share $ 0.001 $ 0.001
Common Stock, Shares Authorized 500,000,000 500,000,000
Common Stock, Shares, Issued 19,856,174 19,744,675
Common Stock, Shares, Outstanding 19,711,968 19,600,469