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Investment Securities (Tables)
 9 Months Ended
Sep. 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 September 30, 2022
Amortized CostUnrealized Holding
Gains (Losses)		Fair Value
Short-term corporate bonds$1,511 $— $1,511 
Short-term U.S. treasury securities1,408 — 1,408 
Long-term corporate bonds1,333 — 1,333 
Long-term government bonds498 — 498 
Total investment securities$4,750 $— $4,750 
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
September 30, 2022December 31, 2021
Equity method investment$3,188 $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.