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Disaggregated Revenues
 12 Months Ended
Dec. 31, 2018
Disaggregated Revenues  
Disaggregated Revenues

17. Disaggregated Revenues

The following tables summarize the disaggregation of revenue by nature:

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended December 31,

 

    

2018

    

2017

    

2016

 

 

(in thousands)

Net Product Sales:

 

 

 

 

 

 

 

 

 

Trokendi XR

 

$

315,295

 

$

226,518

 

$

158,384

Oxtellar XR

 

 

84,576

 

 

67,579

 

 

51,694

Total Net Product Sales     

 

 

399,871

 

 

294,097

 

 

210,078

Royalty Revenues

 

 

8,276

 

 

6,367

 

 

4,686

Licensing Revenue

 

 

750

 

 

1,774

 

 

239

Total Revenues

 

$

408,897

 

$

302,238

 

$

215,003

 

The Company recognized non-cash royalty revenue of $5.9 million, $5.3 million and $4.7 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Licensing revenue included $0.75 million and $1.5 million of milestone revenue for the years ended December 31, 2018 and 2017, respectively. No milestone revenue was recorded during the year ended December 31, 2016.

For the year ended December 31, 2018, revenue recognized from performance obligations related to prior periods (for example, due to changes in transaction price) was not material in the aggregate to Net Product Sales, License Revenue and Royalty Revenue.