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Stockholders' Equity - 1999 Stock Option Plan and Equity Participation Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Oct. 25, 2001
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share options outstanding (in shares) 94,500 188,213  
Shares options outstanding vested or expected to vest -weighted average exercise price (usd per share) $ 5.19    
Shares options outstanding vested or expected to vest ,intrinsic value $ 0.7    
Shares options outstanding vested or expected to vest -weighted average contractual life 1 year 10 months 6 days    
The 1999 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate number of common stock shares authorized for issuance (in shares)     4,398,001