Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value of Marketable debt Securities	$ 4,685	$ 6,687
Level 1 [Member]
Fair Value of Marketable debt Securities
Level 2 [Member]
Fair Value of Marketable debt Securities	4,685	6,687
Level 3 [Member]
Fair Value of Marketable debt Securities
U.S. Government Obligations [Member]
Fair Value of Marketable debt Securities	1,173	2,398
U.S. Government Obligations [Member] | Level 1 [Member]
Fair Value of Marketable debt Securities
U.S. Government Obligations [Member] | Level 2 [Member]
Fair Value of Marketable debt Securities	1,173	2,398
U.S. Government Obligations [Member] | Level 3 [Member]
Fair Value of Marketable debt Securities
Corporate Obligations [Member]
Fair Value of Marketable debt Securities	3,512	4,289
Corporate Obligations [Member] | Level 1 [Member]
Fair Value of Marketable debt Securities
Corporate Obligations [Member] | Level 2 [Member]
Fair Value of Marketable debt Securities	3,512	4,289
Corporate Obligations [Member] | Level 3 [Member]
Fair Value of Marketable debt Securities