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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Nov. 10, 2010
item
$ / shares
shares
Mar. 31, 2015
USD ($)
item
shares
Dec. 31, 2015
USD ($)
Stockholders' Equity      
Number of shares of common stock issued in equity and public offering   1,437,000  
Net proceeds from issue of shares of common stock in equity and public offering | $   $ 21,400 $ 21,368
Number of executive officers | item   2  
Shares purchased by executive officers   40,625  
Stockholder Rights Plan      
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock | item 1    
Number of shares of Series AA Preferred Stock that a registered holder of right is entitled to purchase 0.001    
Exercise price (in dollars per one-thousandth of a share) | $ / shares $ 4.80    
Percentage of the company's common stock acquired by a third party upon which the rights become exercisable 15.00%    
Minimum percentage of the company's common stock that must receive a tender offer from a third party upon which the rights become exercisable 15.00%    
Beneficial ownership threshold for a holder of grandfathered stock (as a percent) 20.00%    
Beneficial ownership threshold for a holder of grandfathered stock after amendment (as a percent) 15.00%