Quarterly report pursuant to Section 13 or 15(d)

Short-term Investments (Details)

v3.20.1
Short-term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 14,267 $ 6,494
Unrealized Gains 18 15
Unrealized Losses (15) (14)
Fair Value 14,270 6,495
Commercial paper    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 8,267 998
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 8,267 998
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 6,000 1,996
Unrealized Gains 18 15
Unrealized Losses (15) (14)
Fair Value $ 6,003 $ 1,997