Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value of Marketable Securities	$ 6,866	$ 18,765
Level 1 [Member]
Fair Value of Marketable Securities
Level 2 [Member]
Fair Value of Marketable Securities	6,866
Level 3 [Member]
Fair Value of Marketable Securities
U.S. Government Obligations [Member]
Fair Value of Marketable Securities	2,575
U.S. Government Obligations [Member] | Level 1 [Member]
Fair Value of Marketable Securities
U.S. Government Obligations [Member] | Level 2 [Member]
Fair Value of Marketable Securities	2,575
U.S. Government Obligations [Member] | Level 3 [Member]
Fair Value of Marketable Securities
Corporate Obligations [Member]
Fair Value of Marketable Securities	4,291
Corporate Obligations [Member] | Level 1 [Member]
Fair Value of Marketable Securities
Corporate Obligations [Member] | Level 2 [Member]
Fair Value of Marketable Securities	4,291
Corporate Obligations [Member] | Level 3 [Member]
Fair Value of Marketable Securities