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Stock-Based Compensation - Summary of Stock Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock Options Outstanding, Beginning balance 189,466 286,706
Stock Options Outstanding, Canceled (166,708) (71,400)
Stock Options Outstanding, Forfeited   (25,841)
Stock Options Outstanding, Ending balance 22,758 189,466
Stock Options Exercisable 22,758  
Weighted Average Exercise Price Outstanding, Beginning balance $ 84.81 $ 77.51
Weighted Average Exercise Price, Canceled 84.96 80.23
Weighted Average Exercise Price, Forfeited   16.42
Weighted Average Exercise Price Outstanding, Ending balance 83.67 $ 84.81
Weighted Average Exercise Price Exercisable $ 83.67  
Weighted Average Remaining Contractual Life (Years), Beginning balance 1 year 9 months 18 days 3 years 9 months 18 days
Weighted Average Remaining Contractual Life (Years), Ending balance 2 months 12 days 1 year 9 months 18 days
Weighted Average Remaining Contractual Life (Years), Exercisable 2 months 12 days