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Investment Securities (Tables)
6 Months Ended
Jun. 30, 2021
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, 2021
Amortized CostUnrealized Holding Gains (Losses)Fair Value
Short-term corporate bonds$14,661 $— $14,661 
Long-term corporate bonds15,670 — 15,670 
Total investment securities$30,331 $— $30,331 
As of December 31, 2020
Amortized CostUnrealized Holding Gains (Losses)Fair Value
Short-term corporate bonds$14,687 $— $14,687 
Long-term corporate bonds12,974 — 12,974 
Total investment securities$27,661 $— $27,661