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Revenues (Tables)
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Accounts Receivable
The following table shows the components of the Company's Trade receivables, net:
As of
(in thousands)September 30, 2021December 31, 2020
Trade receivables$13,138 $12,241 
Less: Allowance for doubtful accounts(5)(37)
Trade receivables, net$13,133 $12,204 
The following table shows the components of the Cabot Receivable:
As of
(in thousands)September 30, 2021December 31, 2020
Receivables, net$2,146 $921 
Other long-term assets, net6,812 8,852 
Total Cabot Receivable$8,958 $9,773 
Schedule of Disaggregation of Revenue The following tables disaggregate revenues by major component for the three and nine months ended September 30, 2021 and 2020 (in thousands):
Three Months Ended September 30, 2021Nine Months Ended September 30, 2021
SegmentSegment
APTRCTotalAPTRCTotal
Revenue component
Consumables$24,689 $— $24,689 $57,696 $— $57,696 
License royalties, related party— 4,165 4,165 — 11,888 11,888 
Revenues from customers24,689 4,165 28,854 57,696 11,888 69,584 
Earnings from equity method investments— 22,195 22,195 — 61,944 61,944 
Total revenues from customers and earnings from equity method investments$24,689 $26,360 $51,049 $57,696 $73,832 $131,528 
Three Months Ended September 30, 2020Nine Months Ended September 30, 2020
SegmentSegment
APTRCTotalAPTRCTotal
Revenue component
Consumables$15,844 $— $15,844 $33,231 $— $33,231 
License royalties, related party— 3,627 3,627 — 9,986 9,986 
Revenues from customers15,844 3,627 19,471 33,231 9,986 43,217 
Earnings from equity method investments— 9,518 9,518 — 25,959 25,959 
Total revenues from customers and earnings from equity method investments$15,844 $13,145 $28,989 $33,231 $35,945 $69,176