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Investment Securities (Tables)
9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block] Our short investment securities consisted of the following (in thousands):
As of September 30, 2020
Amortized CostUnrealized Holding Gains (Losses)Fair Value
Short-term corporate bonds$12,544 $— $12,544 
As of December 31, 2019
Amortized CostUnrealized Holding Gains (Losses)Fair Value
Short-term corporate bonds$23,967 $— $23,967