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Common Stock Issuances (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Subsidiary or Equity Method Investee [Line Items]      
Number of common shares issued 12,428,342 10,857,801 10,883,509
Gross proceeds associated with sale $ (43) $ 75