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Stockholders' Equity - Summary of Stock Option Activity Under Stock Option and Incentive Plans (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]    
Outstanding, Beginning balance 635,597 1,106,140
Granted 37,500
Lapsed/terminated (152,930) (508,043)
Outstanding, Ending balance 482,667 635,597
Exercisable 478,500 610,611
Expected to vest , Ending balance 4,167 25,000
Outstanding Beginning balance, Weighted Average Exercise Price $ 9.33 $ 11.56
Granted, Weighted Average Exercise Price 1.00
Lapsed/terminated, Weighted Average Exercise Price 9.67 13.56
Outstanding, Ending balance, Weighted Average Exercise Price 10.72 9.33
Exercisable Weighted Average Exercise Price 9.29 10.85
Expected to Vest, Ending balance, Weighted Average Exercise Price $ 1.00 $ 1.00
Oustanding, Weighted Average Life Remaining 3 years 3 months 19 days 3 years 8 months 12 days
Exercisable, Weighted Average Life Remaining 3 years 3 months 19 days 3 years 8 months 12 days
Expected to vest, Weighted Average Life Remaining 3 years 3 months 19 days 4 years 3 months 19 days
Aggregate intrinsic value of outstanding option, Ending balance $ 10,000
Aggregate intrinsic value of exercisable options, Ending balance 6,667
Aggregate intrinsic value of options expected to vest, Ending balance $ 3,333