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Summary of Stock Option Activity (Details) - $ / shares
 6 Months Ended
Jun. 30, 2017
Jun. 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 977,570 223,070    
Number of Common Shares, Options Outstanding, Exercised (19,989) (294,956)    
Number of Common Shares, Options Outstanding, Cancelled (41,459) (10,000)    
Number of Common Shares, Options Outstanding, End of year 4,318,603 2,337,643    
Number of Common Shares, Exercisable        
Number of Common Shares Exercisable 391,040 429,573 411,029 724,529
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) (223,070)    
Number of Common Shares, Available for Grant, Cancelled 41,459 10,000    
Number of Common Shares, Available for Grant, end of year 227,744 1,499,274    
Weighted-Average Exercise Price        
Weighted-Average Exercise Price, beginning of year $ 9.02 $ 8.16    
Weighted-Average Exercise Price, Granted 14.25 11.19    
Weighted-Average Exercise Price, Exercised 7.70 11.21    
Weighted-Average Exercise Price, Cancelled 11.94 9.33    
Weighted-Average Exercise Price, end of year $ 10.19 $ 8.75