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Revenue from Contracts with Customers
 9 Months Ended
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers Revenue from Contracts with Customers
The following table summarizes revenue by revenue source and reportable segment as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
Major Products/Service Lines by Segment (in thousands)2020201920202019
U.S.
    Product revenue, net(1)

$73,080 $74,650 $208,482 $225,274 
    License and royalty revenues
4,395 — 5,137 — 
Total U.S. revenues77,475 74,650 213,619 225,274 
International
    Product revenue, net(1)

10,581 10,587 30,319 31,123 
    License and royalty revenues488 539 1,320 1,594 
Total International revenues
11,069 11,126 31,639 32,717 
Total revenues$88,544 $85,776 $245,258 $257,991 
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(1)The Company’s principal products include DEFINITY and TechneLite and are categorized within product revenue, net. The Company applies the
same revenue recognition policies and judgments for all of its principal products.
The Company’s performance obligations are typically part of contracts that have an original expected duration of one year or less. As such, the Company is not disclosing the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied (or partially satisfied) as of the end of the reporting period.