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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
Our short-term and long-term investments in available-for-sale securities consist of the following (in thousands):
As of June 30, 2022
Amortized CostUnrealized Holding
Gains (Losses)		Fair Value
Short-term corporate bonds$11,787 $— $11,787 
Short-term U.S. treasury securities1,404 — 1,404 
Long-term corporate bonds1,837 — 1,837 
Total investment securities$15,028 $— $15,028 
As of December 31, 2021
Amortized CostUnrealized Holding
Gains (Losses)		Fair Value
Short-term corporate bonds$14,420 $— $14,420 
Long-term corporate bonds4,620 — 4,620 
Total investment securities$19,040 $— $19,040 
Equity Method Investments [Table Text Block]
Our non-marketable equity method investment consists of the following (in thousands):

As of
June 30, 2022December 31, 2021
Equity method investment$3,206 $3,238 

Investments in non-marketable debt securities

During the second quarter 2022, we received $19.0 million in proceeds from a promissory note related to an acquired investment as part of the Smiths Medical acquisition.