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Fair value disclosures
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair value disclosures Fair value disclosures
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following table presents the Company's assets that are measured at fair value on a recurring basis (in thousands):  
 As of September 30, 2021As of December 31, 2020
 Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets        
Short-term investments:
Money market funds$27,674 $— $— $27,674 $27,669 $— $— $27,669 
Other long-term assets:
Mutual funds held in Rabbi Trust$847 $— $— $847 $810 $— $— $810 
 The Company offers a Non-Qualified Deferred Compensation Plan (“NQDC Plan”) to a select group of its highly compensated employees. The NQDC Plan provides participants the opportunity to defer payment of certain compensation as defined in the NQDC Plan. A Rabbi Trust has been established to fund the NQDC Plan obligation, which was fully funded at September 30, 2021. The assets held by the Rabbi Trust are substantially in the form of exchange traded mutual funds and are included in the Company’s other long-term assets on its condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020.
There were no liabilities that are measured at fair value on a recurring basis as of September 30, 2021.
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
As of September 30, 2021 and December 31, 2020 the Company had no assets or liabilities required to be measured at fair value on a nonrecurring basis. 
Assets and Liabilities Not Measured at Fair Value 
The carrying values of accounts receivable, accounts payable and short-term borrowings approximate their fair values due to the short-term nature and liquidity of these financial instruments.