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SHORT-TERM INVESTMENTS (Tables)
9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-Term Investments
The following tables summarize the estimated fair value of the Company’s cash equivalents and debt securities and the gross unrealized holding gains and losses as of September 30, 2021 (in thousands):


Amortized costUnrealized gainUnrealized LossEstimated Fair Value
Assets
Cash equivalents:
Money market fund$3,787 $— $— $3,787 
Total cash equivalents$3,787 $— $— $3,787 
Debt securities:
Corporate debt securities$34,378 $$(17)$34,363 
Commercial paper$20,738 $$— $20,740 
U.S. government bonds$80,845 $$(8)$80,840 
Certificate of deposits$24,520 $$— $24,523 
Other$10,333 $— $(4)$10,329 
Total debt securities$170,814 $10 $(29)$170,795 
Classified as:
Cash equivalents$3,787 
Short-term debt securities$170,795 
Long-term debt securities$— 
$174,582