Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Instruments (Details)

v3.20.1
Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value of Marketable debt Securities $ 926 $ 6,687
Level 1 [Member]    
Fair Value of Marketable debt Securities
Level 2 [Member]    
Fair Value of Marketable debt Securities 926 6,687
Level 3 [Member]    
Fair Value of Marketable debt Securities
U.S. Government Obligations [Member]    
Fair Value of Marketable debt Securities 125 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 125 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 801 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 801 4,289
Corporate Obligations [Member] | Level 3 [Member]    
Fair Value of Marketable debt Securities