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Revenue (Tables)
6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Summary of expected timing of revenue recognition The following table summarizes the expected timing of revenue recognition for unfulfilled performance obligations associated with instrument service contracts that were partially completed at June 30, 2018 (in thousands):
Fiscal Year
 
Expected Revenue (1)
2018 (remainder of the year)
 
$
5,494

2019
 
6,973

2020
 
3,302

Thereafter
 
1,323

Total
 
$
17,092

_______
(1) Expected revenue includes both billed amounts included in deferred revenue and unbilled amounts that are not reflected in our consolidated financial statements and are subject to change if our customers decide to cancel or modify their contracts. Purchase orders for instrument service contracts can generally be canceled before the service period begins without penalty.
Summary of disaggregation of revenue The following table disaggregates our revenue for the three and six months ended June 30, 2018, and 2017, respectively, by geographic area and by products and services (in thousands):

 
Three Months Ended June 30,
 
Year Over Year Change
 
Six Months Ended June 30,
 
Year Over Year Change
2018
 
2017
 
 
2018
 
2017
 
Geographic Markets:
 
 
 
 
 
 
 
 
 
 
 
United States
$
12,042

 
$
11,674

 
$
368

 
$
22,158

 
$
23,505

 
$
(1,347
)
Europe
9,109

 
7,748

 
1,361

 
17,582

 
15,384

 
2,198

Asia Pacific
4,799

 
3,866

 
933

 
10,740

 
8,853

 
1,887

Other
478

 
624

 
(146
)
 
1,196

 
1,703

 
(507
)
Total revenue
$
26,428

 
$
23,912

 
$
2,516

 
$
51,676

 
$
49,445

 
$
2,231

 
 
 
 
 
 
 
 
 
 
 
 
Products and Services:
 
 
 
 
 
 
 
 
 
 
 
Instruments
$
10,421

 
$
9,928

 
$
493

 
$
17,941

 
$
20,665

 
$
(2,724
)
Consumables
11,356

 
9,572

 
1,784

 
24,313

 
20,142

 
4,171

Product revenue
21,777

 
19,500

 
2,277

 
42,254

 
40,807

 
1,447

Services
4,651

 
4,319

 
332

 
9,422

 
8,486

 
936

License

 
93

 
(93
)
 

 
152

 
(152
)
Total revenue
$
26,428

 
$
23,912

 
$
2,516

 
$
51,676

 
$
49,445

 
$
2,231