Stockholders' Equity (Deficit) (Details 2) - Option [Member] - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Shares
Outstanding, Beginning balance	1,037	736
Granted	40
Outstanding, Ending Balance	1,077	736
Vested and expected to vest, Ending balance	1,077	702
Exercisable, Ending balance	402	153
Weighted Average Exercise Price Per share
Outstanding, Beginning balance	$ 1.65	$ 3.65
Granted	0.50
Outstanding, Ending balance	1.61	3.65
Vested and expected to vest, Ending balance	1.61	3.86
Exercisable, Ending balance	$ 3.24	$ 15.67
Weighted Average Remaining Contractual Term (Years)
Outstanding, Ending balance	5 years 8 months 19 days	6 years 1 month 9 days
Vested and expected to vest, Ending balance	5 years 8 months 19 days	6 years 1 month 2 days
Exercisable, Ending balance	5 years 3 months 11 days	4 years 9 months 25 days
Aggregate Intrinsic Value
Outstanding, Beginning balance
Granted
Outstanding, Ending balance
Vested and expected to vest, Ending balance
Exercisable, Ending balance