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Revenue from Contracts with Customers (Tables)
12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue
The following table summarizes revenue by revenue source and reportable segment as follows:
 
 
Year Ended December 31,
Major Products/Service Lines by Segment (in thousands)
 
2019
 
2018
U.S.
 
 
 
 
    Product revenue, net(1)
 
$
303,989

 
$
288,580

Total U.S. revenues
 
303,989

 
288,580

International
 
 
 
 
    Product revenue, net(1)
 
41,287

 
52,556

    License and royalty revenues
 
2,061

 
2,238

Total International revenues
 
43,348

 
54,794

Total revenues
 
$
347,337

 
$
343,374

______________________________
(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.
Schedule of contracts with customer
The Company recognized certain revenues as follows:
 
Year Ended December 31,
(in thousands)
2019
 
2018
Amounts included in the contract liability at the beginning of the period
$
33

 
$
33

Performance obligations satisfied (or partially satisfied) in previous periods
$

 
$