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Revenue
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
REVENUE REVENUE
Disaggregated Revenue
The following table presents the disaggregation of our revenue for the three and nine months ended September 30, 2019 and 2018 (in thousands):
 
Three months ended September 30,
 
 
 
 
 
2019
 
2018
 
 Increase/(Decrease)
Variable patent royalty revenue
$
4,683

 
$
13,645

 
$
(8,962
)
 
(66
)%
Fixed-fee royalty revenue
63,736

 
60,272

 
3,464

 
6
 %
Current patent royalties a
68,419

 
73,917

 
(5,498
)
 
(7
)%
Non-current patent royalties b
(370
)
 
128

 
(498
)
 
(389
)%
Total patent royalties
68,049

 
74,045

 
(5,996
)
 
(8
)%
Current technology solutions revenue a
3,724

 
1,034

 
2,690

 
260
 %
Patent sales b
750

 
—

 
750

 
—
 %
Total revenue
$
72,523

 
$
75,079

 
$
(2,556
)
 
(3
)%
 
Nine months ended September 30,
 
 
 
 
 
2019
 
2018
 
 Increase/(Decrease)
Variable patent royalty revenue
$
22,557

 
$
26,322

 
$
(3,765
)
 
(14
)%
Fixed-fee royalty revenue
190,345

 
178,207

 
12,138

 
7
 %
Current patent royalties a
212,902

 
204,529

 
8,373

 
4
 %
Non-current patent royalties b
(4,908
)
 
25,489

 
(30,397
)
 
(119
)%
Total patent royalties
207,994

 
230,018

 
(22,024
)
 
(10
)%
Current technology solutions revenue a
7,794

 
2,060

 
5,734

 
278
 %
Patent sales b
975

 
—

 
975

 
—
 %
Total revenue
$
216,763

 
$
232,078

 
$
(15,315
)
 
(7
)%

a.
Recurring revenues are comprised of current patent royalties, inclusive of Dynamic Fixed-Fee Agreement royalties, and current technology solutions revenue.
b.
Non-recurring revenues are comprised of non-current patent royalties, which primarily include past patent royalties and royalties from static agreements, as well as patent sales.
    During first nine months 2019, we recognized $120.3 million of revenue that had been included in deferred revenue as of the beginning of the period. As of September 30, 2019, we had contract assets of $14.4 million and $1.3 million included within accounts receivable and other non-current assets, respectively. As of December 31, 2018, we had contract assets of $19.7 million and $5.5 million included within accounts receivable and other non-current assets, respectively.
Contracted Revenue
Based on contracts signed and committed as of September 30, 2019, we expect to recognize the following revenue from Dynamic Fixed-Fee Agreement payments over the term of such contracts (in thousands):
 
Revenue
Remainder 2019
$
63,736

2020
248,250

2021
178,583

2022
85,228

2023
—