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Stock-Based Compensation Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement [Line Items]    
Stock options terms (in years) 10 years  
Stock-based compensation expense $ 734 $ 1,436
Directors' Plan [Member]    
Statement [Line Items]    
Shares reserved for future grants under the stock option and compensation plan 371,000  
Employee Equity Plan [Member]    
Statement [Line Items]    
Awards vesting period (in years) 3 years  
Shares reserved for future grants under the stock option and compensation plan 11,509,262