Stockholders' Equity (Details 2) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares
Minimum [Member]
Stockholders Equity Details Rsu And Stock Option Activity [Line Items]
Options Outstanding, Exercise Price Range	$ 0.80
Options Granted, Exercise Price Range	0.25
Options Forfeited/cancelled, Exercise Price Range	3.40
Options Outstanding, Exercise Price Range	0.25
Options Exercisable, Exercise Price Range	0.34
Maximum [Member]
Stockholders Equity Details Rsu And Stock Option Activity [Line Items]
Options Outstanding, Exercise Price Range	80.00
Options Granted, Exercise Price Range	0.34
Options Forfeited/cancelled, Exercise Price Range	80.00
Options Outstanding, Exercise Price Range	61.00
Options Exercisable, Exercise Price Range	$ 61.00
Employee Stock Option [Member]
Stockholders Equity Details Rsu And Stock Option Activity [Line Items]
Options, Outstanding (in Shares) | shares	519,014
Options, Granted (in Shares) | shares	72,000
Options, Forfeited/cancelled (in Shares) | shares	(15,417)
Options, Outstanding (in Shares) | shares	575,597
Options, Exercisable (in shares) | shares	395,847
Options Outstanding, Weighted Average Fair Value	$ 9.80
Options Granted, Weighted Average Exrecise Price	0.27
Options Forfeited/cancelled, Weighted Average Exercise Price	15.78
Options Outstanding, Weighted Average Fair Value	8.40
Options Exercisable, weighted average exercise price	11.60
Options Outstanding, Weighted Average Grant Date Fair Value	9.40
Options Granted, Weighted Average Grant Date Fair Value	0.23
Options Forfeited/cancelled, Weighted Average Grant Date Fair Value	11.96
Options outstanding, Weighted Average Grant Date Fair Value	8.20
Options Exercisable, Weighted Average Grant Date Fair Value	$ 11.40
Options Outstanding, Aggregate Intrinsic Value (in Dollars) | $	$ 0
Options Granted, Aggregate Intrinsic Value (in Dollars) | $	0
Options Forfeited/Expired, Aggregate Intrinsic Value (In Dollars) | $	0
Options Outstanding, Aggregate Intrinsic Value (in Dollars) | $	0
Options Exercisable, Aggregate Intrinsic Value (in Dollars) | $	$ 0