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Stock Benefit Plans Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation expense not yet recognized | $ $ 2.1
Period for recognition (in years) 1 year
2004 Plan | Common Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares reserved for future issuance (in shares) 1,805,613
Shares available for issuance (in shares) 1,386,452
2006 Plan | Common Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares reserved for future issuance (in shares) 1,200,000
Shares available for issuance (in shares) 380,977
Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity-based awards outstanding (in shares) 56,000
Options | 2004 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option term (in years) 7 years
Equity-based awards outstanding (in shares) 204,852
Options | 2004 Plan | Employees Who Own More Than 10% of the Voting Power of All Classes of Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option term (in years) 5 years
Ownership in voting powers ( as a percent) 10.00%
Exercise price as a percentage of fair value of common stock 110.00%
Options | 2004 Plan | Other Employees and Consultants  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price as a percentage of fair value of common stock 100.00%
Options | 2004 Plan | Other Employees and Consultants | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price as a percentage of fair value of common stock 85.00%
Options | 2006 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option term (in years) 10 years
Exercise price as a percentage of fair value of common stock 100.00%
Equity-based awards outstanding (in shares) 51,318
Stock Appreciation Rights (SARs) | 2004 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option term (in years) 7 years
Exercise price as a percentage of fair value of common stock 100.00%
Stock Appreciation Rights (SARs) | 2006 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option term (in years) 10 years
Exercise price as a percentage of fair value of common stock 100.00%
Fair value on grant date - restricted stock | 2004 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Purchase price (in dollars per share) | $ / shares $ 0.001