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Warrants
12 Months Ended
Dec. 31, 2016
Warrants [Abstract]  
Warrants
12. Warrants
  
As part of a previous subordinated debt financing, which was fully repaid in December 2011, the Company issued warrants to purchase up to 81,224 shares of the Company's common stock at $8.75 per share.  The warrants were exercised on December 16, 2015 on a "cashless" basis, resulting in the issuance on that date of 23,442 net shares of Common Stock to the exercising holders of the warrants.