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Revenue (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of 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.
Schedule of 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
—