Convertible Notes Payable and Convertible Notes Payable to Related Parties - Schedule of Derivative Liabilities Valuation Using Binomial Lattice Model Assumptions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Fair Value - Note Conversion Feature	$ 890	$ 1,018
Monte Carlo Method [Member]
Stock Price	$ 9.99	$ 6.75
Fair Value - Note Conversion Feature	$ 890	$ 1,018
Monte Carlo Method [Member] | Risk Free Interest Rate [Member]
Fair value assumptions, measurement input, percentages		261.00%
Monte Carlo Method [Member] | Risk Free Interest Rate [Member] | Minimum [Member]
Fair value assumptions, measurement input, percentages	2.41%
Monte Carlo Method [Member] | Risk Free Interest Rate [Member] | Maximum [Member]
Fair value assumptions, measurement input, percentages	2.43%
Monte Carlo Method [Member] | Contractual Term (Years) [Member]
Fair value assumptions, measurement input, term		8 months 23 days
Monte Carlo Method [Member] | Contractual Term (Years) [Member] | Minimum [Member]
Fair value assumptions, measurement input, term	4 months 2 days
Monte Carlo Method [Member] | Contractual Term (Years) [Member] | Maximum [Member]
Fair value assumptions, measurement input, term	7 months 28 days
Monte Carlo Method [Member] | Expected Dividend Yield [Member]
Fair value assumptions, measurement input, percentages	0.00%	0.00%
Monte Carlo Method [Member] | Expected Volatility [Member]
Fair value assumptions, measurement input, percentages		92.80%
Monte Carlo Method [Member] | Expected Volatility [Member] | Minimum [Member]
Fair value assumptions, measurement input, percentages	93.10%
Monte Carlo Method [Member] | Expected Volatility [Member] | Maximum [Member]
Fair value assumptions, measurement input, percentages	94.30%