Stockholders' Equity - Summary of Stock Option Activity Under Stock Option and Incentive Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Outstanding, Beginning balance	482,667	635,597
Granted	405,000
Lapsed/terminated	(105,012)	(152,930)
Outstanding, Ending balance	782,655	482,667
Exercisable	490,988	478,500
Expected to vest , Ending balance	291,667	4,167
Outstanding Beginning balance, Weighted Average Exercise Price	$ 10.72	$ 9.33
Granted, Weighted Average Exercise Price	1.38
Lapsed/terminated, Weighted Average Exercise Price	4.96	9.67
Outstanding, Ending balance, Weighted Average Exercise Price	6.66	10.72
Exercisable Weighted Average Exercise Price	8.30	9.29
Expected to Vest, Ending balance, Weighted Average Exercise Price	$ 1.41	$ 1.00
Oustanding, Weighted Average Life Remaining	3 years 2 months 12 days	3 years 3 months 19 days
Exercisable, Weighted Average Life Remaining	2 years 9 months 18 days	3 years 3 months 19 days
Expected to vest, Weighted Average Life Remaining	4 years 6 months	3 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