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Capital Stock
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Capital Stock
(9) Capital Stock

As of December 31, 2015 and 2014, we had 24,088 authorized but unissued shares of preferred stock. In addition, as of December 31, 2015, 445,000 authorized but unissued shares of common stock have been reserved for future issuance upon exercise of stock options.