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Fair Value Measurements
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables summarize our assets and liabilities that are measured at fair value on a recurring basis, by level, within the fair value hierarchy (in thousands):
As of December 31, 2022
Level 1Level 2Level 3
Available-for-sale debt securities$— $— $995 
Money market fund130,215 — — 
Total assets$130,215 $— $995 
Contingent consideration— — 836 
Total liabilities$— $— $836 
 As of December 31, 2021
 Level 1Level 2Level 3
Available-for-sale debt securities
$— $— $1,122 
Money market fund
30,215 — — 
Total assets
$30,215 $— $1,122 
Contingent consideration— — 750 
Total liabilities
$— $— $750 
There was no change in the fair value of the contingent consideration from our acquisition of UAS and Pure for the years ended December 31, 2022 and 2021.
Our available-for-sale debt securities measured using Level 3 inputs have the following activity (in thousands):
 
As of December 31,
 202220212020
Beginning balance
$1,122 $1,050 $5,528 
Change in fair value
(127)72 434 
Other-than-temporary impairment
— — (4,912)
Ending balance
$995 $1,122 $1,050 
Our financial guarantee measured using Level 3 inputs has the following activity (in thousands):
 
As of December 31,
 20212020
Beginning balance
$150 $1,900 
Change in fair value
— (1,750)
Gain on cancellation of financial guarantee(150)— 
Ending balance
$— $150