Quarterly report pursuant to Section 13 or 15(d)

Short-term Investments (Details)

v3.20.2
Short-term Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 3,594 $ 6,494
Unrealized Gains 0 15
Unrealized Losses 0 (14)
Fair Value 3,594 6,495
Commercial paper    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 3,594 998
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value $ 3,594 998
Overnight repurchase agreement    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   3,500
Unrealized Gains   0
Unrealized Losses   0
Fair Value   3,500
U.S. government securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   1,996
Unrealized Gains   15
Unrealized Losses   (14)
Fair Value   $ 1,997