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Other Assets (Tables)
3 Months Ended
Mar. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Assets
Other assets consisted of the following (in thousands):
As of
March 31, 2021December 31, 2020
Demonstration assets, net$2,472 $2,598 
Deferred tax assets, net66 69 
Other2,500 2,500 
$5,038 $5,167 
Amortization expense was as follows for the periods presented (in thousands):
Three Months Ended March 31,
 20212020
Amortization expense$541 $504