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Inventory
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventory Inventory
Inventory is stated at the lower of average cost (principally standard cost, which approximates actual cost on a first-in, first-out basis) and net realizable value. Inventory includes raw materials and components that may be specialized in nature and subject to obsolescence. On a quarterly basis, we review inventory quantities on hand in comparison to our past consumption, recent purchases, and other factors to determine what inventory quantities, if any, may not be sellable. Based on this analysis, we write down the affected inventory value for estimated excess and obsolescence charges. At the point of loss recognition, a new, lower-cost basis for that inventory is established, and subsequent changes in facts and circumstances do not result in the restoration or increase in that newly established cost basis.
Inventory consisted of the following (in thousands):
As of
March 31, 2021December 31, 2020
Raw materials$22,852 $21,410 
Work in process and semi-finished goods23,829 21,320 
Finished goods12,123 11,976 
$58,804 $54,706