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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 |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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