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Revenues
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenues RevenuesTrade receivables represent an unconditional right to consideration in exchange for goods or services transferred to a customer. The Company invoices its customers in accordance with the terms of the contract. Credit terms are generally net 30 from the date of invoice. The timing between the satisfaction of performance obligations and when payment is due from the customer is
generally not significant. The Company records allowances for doubtful trade receivables when it is probable that the balances will not be collected.
Trade receivables, net
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 
Cabot Receivable
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 

Disaggregation of Revenue and Earnings from Equity Method Investments
For the three and nine months ended September 30, 2021 and 2020, all performance obligations related to revenues recognized were satisfied at a point in time. The Company disaggregates its revenues by major components as well as between its two reportable segments, which are further discussed in Note 17 to the Condensed Consolidated Financial Statements. 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