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Summary of Stock Option Activity (Details) - $ / shares
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Number of Common Shares, Options Outstanding        
Number of Common Shares, Options Outstanding, Beginning of year 3,402,481 2,419,529    
Number of Common Shares, Options Outstanding, Granted 977,570 1,128,070    
Number of Common Shares, Options Outstanding, Options Subject to Anti-Dilutive Adjustments   (2,337,643)    
Number of Common Shares, Options Outstanding, Options Subject to Anti-Dilutive Adjustments   2,337,643    
Number of Common Shares, Options Outstanding, Exercised (22,989) (310,656)    
Number of Common Shares, Options Outstanding, Cancelled (128,105) (10,000)    
Number of Common Shares, Options Outstanding, End of year 4,228,957 3,226,943    
Number of Common Shares, Exercisable        
Number of Common Shares Exercisable 388,040 413,873 411,029 724,529
Number of Common Shares, Available for Grant        
Number of Common Shares, Available for Grant, beginning of year 274,596 837,635    
Number of Common Shares, Available for Grant, Authorized 889,259 874,709    
Number of Common Shares, Available for Grant, Granted (977,570) (1,128,070)    
Number of Common Shares, Available for Grant, Cancelled 103,105 10,000    
Number of Common Shares, Available for Grant, end of year 289,390 594,274    
Weighted-Average Exercise Price        
Weighted-Average Exercise Price, beginning of year $ 9.02 $ 8.16    
Weighted-Average Exercise Price, Granted 14.25 11.89    
Weighted-Average Exercise Price, Options Subject to Anti-Dilutive Adjustments   8.75    
Weighted-Average Exercise Price, Options Subject to Anti-Dilutive Adjustments   7.04    
Weighted-Average Exercise Price, Exercised 7.36 5.73    
Weighted-Average Exercise Price, Cancelled 11.36 9.33    
Weighted-Average Exercise Price, end of year $ 10.17 $ 8.57