Fair Value Measurements - Schedule of Warrant Liabilities, Change in Using Black Scholes to Monte Carlo Simulation Assumptions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Exercise Price	$ 0.75	$ 0.75
Stock price - subsidiary	$ 0.15	$ 0.22
Discount applied	50.00%	50.00%
Fair value of stock price	$ 0.04	$ 0.09
Number of subsidiary warrants outstanding	48,904,037	48,904,037
Warrant Liability	$ 2,051	$ 4,528
Risk Free Interest Rate [Member]
Fair value assumption, warrant percentage	2.22%	2.49%
Contractual Term (Years) [Member]
Fair value assumption, warrant Contractual term (years)	3 years 9 months 29 days	4 years 29 days
Expected Dividend Yield [Member]
Fair value assumption, warrant percentage	0.00%	0.00%
Expected Volatility [Member]
Fair value assumption, warrant percentage	85.80%	86.50%