Share-Based Payments - Schedule of Fair Value of Employees and Directors Estimated Using Black-Scholes Option Pricing Model With Following Weighted Average Assumptions (Details) - Employee and Director Stock Options	3 Months Ended
	Mar. 31, 2019 $ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock price	$ 6.93
Exercise price	$ 6.93
Expected term	6 years 1 month 2 days
Expected volatility	76.90%
Risk-free interest rate	2.28%
Dividend rate	0.00%