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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation expense $ 111 $ 136
Proceeds from issuance of common stock 3 0
Unrecognized stock-based compensation expense $ 70 $ 102
Weighted average period unrecognized expense is expected to be recognized 7 months 6 days 9 months 18 days