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Fair Value Measurements
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables present our assets and liabilities measured at fair value on a recurring basis (in thousands):
Fair Value Measurements on a Recurring Basis as of
June 30, 2021
Fair value measurements in:Level 1Level 2Level 3Total
Assets:
Money market accounts$637,048 $— $— $637,048 
Total$637,048 $— $— $637,048 
Fair Value Measurements on a Recurring Basis as of
 December 31, 2020
Fair value measurements in:Level 1Level 2Level 3Total
Assets:
Money market accounts$221,407 $— $— $221,407 
Total$221,407 $— $— $221,407 

The following table summarizes the change in fair value of the Level 3 liabilities for contingent consideration liabilities from acquisitions with significant unobservable inputs (in thousands):
Three Months Ended
June 30,
Six Months Ended
June 30,
2021202020212020
Beginning of period balance$— $2,027 $— $2,595 
Changes in fair value included in earnings— (1,721)— (2,289)
End of period balance$— $306 $— $306 
    
The money market accounts are included in our cash and cash equivalents in our condensed consolidated balance sheets. Our money market assets are valued using quoted prices in active markets. See Note 12 for the carrying amount and estimated fair value of our convertible senior notes as of June 30, 2021.

The contingent consideration liability consisted of the potential earn-out payment related to our acquisition of 85% of the issued and outstanding capital stock of OpenEye on October 21, 2019. The earn-out payment was contingent on the satisfaction of certain calendar 2020 revenue targets and had a maximum potential payment of up to $11.0 million. During parts of 2019 and 2020, we accounted for the contingent consideration using fair value and established a liability for the future earn-out payment based on an estimation of revenue attributable to perpetual licenses and subscription licenses over the 2020 calendar year. The contingent consideration liability was valued with significant unobservable inputs, including the revenue volatility and the discount rate. Selecting another revenue volatility or discount rate within an acceptable range would not have resulted in a significant change to the fair value of the contingent consideration liability. As of October 21, 2019, the fair value of the liability was $2.8 million. At each reporting date until December 31, 2020, we remeasured the liability, using the same valuation approach. Changes in the fair value resulting from information that existed subsequent to the acquisition date were recorded in general and administrative expense in our condensed consolidated statements of operations. As of December 31, 2020, the 2020 revenue targets were not met and the fair value of the contingent consideration related to the potential earn-out payment decreased to zero as compared to the initial liability recorded at the acquisition date, primarily due to OpenEye's 2020 actual revenue being less than the projected revenue.
We monitor the availability of observable market data to assess the appropriate classification of financial instruments within the fair value hierarchy. Changes in economic conditions or model-based valuation techniques may require the transfer of financial instruments from one fair value level to another. There were no transfers in or out of Level 3 during the three and six months ended June 30, 2021 and 2020. We also monitor the value of the investments for other-than-temporary impairment on a quarterly basis. No other-than-temporary impairments occurred during the three and six months ended June 30, 2021 and 2020.