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Stock-Based Compensation - Schedule of Share-based Compensation, Stock Options Outstanding Exercise Prices (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Option Outstanding, Number of Shares | shares 14,000
Stock Option Outstanding, Weighted Average Exercise Price $ 2.23
Stock Option Outstanding, Weighted Average Remaining Contractual Term 1 year 6 months
Exercise Price Range One [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise prices, lower limit $ 1.01
Range of exercise prices, upper limit $ 2.00
Stock Option Outstanding, Number of Shares | shares 7,000
Stock Option Outstanding, Weighted Average Exercise Price $ 1.53
Stock Option Outstanding, Weighted Average Remaining Contractual Term 6 months
Exercise Price Range Two [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise prices, lower limit $ 2.01
Range of exercise prices, upper limit $ 3.00
Stock Option Outstanding, Number of Shares | shares 7,000
Stock Option Outstanding, Weighted Average Exercise Price $ 2.92
Stock Option Outstanding, Weighted Average Remaining Contractual Term 1 year 6 months