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Property and Equipment, Net (Tables)
9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Summary of Property and Equipment
Property and equipment consisted of the following (in thousands):
 September 30, 2021December 31, 2020
Leasehold improvements$8,745 $6,010 
Laboratory and clean room equipment16,497 15,524 
Furniture and equipment14,944 15,295 
Construction in progress677 3,321 
Asset retirement cost880 785 
Finance lease assets189 — 
   Property and equipment, gross41,932 40,935 
Less accumulated depreciation(32,076)(29,498)
   Property and equipment, net$9,856 $11,437 
Schedule of Depreciation Expense
Depreciation expense for each of the three and nine months ended September 30, 2021 and 2020 is summarized in the table below (amounts in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Depreciation expense$923 $1,566 $3,390 $4,494