Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Components of Marketable Securities (Details)

v3.19.3
Summary of Significant Accounting Policies - Summary of Components of Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Amortized Cost $ 3,766 $ 6,711
Unrealized Losses (6) (24)
Market Value 3,760 6,687
U.S. Treasuries [Member]    
Amortized Cost 553 2,401
Unrealized Losses (3) (3)
Market Value 550 2,398
Corporate Bonds [Member]    
Amortized Cost 3,213 4,310
Unrealized Losses (3) (21)
Market Value $ 3,210 $ 4,289