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Investment Securities (Tables)
6 Months Ended
Jun. 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 June 30, 2020
Amortized CostUnrealized Holding Gains (Losses)Fair Value
Short-term corporate bonds$14,564  $—  $14,564  
As of December 31, 2019
Amortized CostUnrealized Holding Gains (Losses)Fair Value
Short-term corporate bonds$23,967  $—  $23,967