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Stockholders' Equity (Stock Purchase) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Oct. 31, 2014
Stockholders' Equity      
Number of shares available for future grants 549,073    
2014 Employee Stock Purchase Plan      
Stockholders' Equity      
Purchase period of offering 6 months    
Rate of purchase price of stock on fair value (as a percent) 85.00%    
Number of shares reserved for future issuance 770,549    
Purchases under the award 54,559    
Weighted Average purchase price $ 5.93    
Stock-based compensation expense $ 0.1 $ 0.1  
2014 Employee Stock Purchase Plan | Maximum      
Stockholders' Equity      
Discount rate on the value of shares through payroll deductions (as a percent) 15.00%    
Expiration period of each offering 27 months    
Number of shares reserved for future issuance     255,500