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Condensed Consolidated Financial Statement Details
6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Condensed Consolidated Financial Statement Details
Condensed Consolidated Financial Statement Details

Inventory

Inventory consisted of the following (in thousands):
 
June 30,
2018
 
December 31,
2017
Raw materials
$
6,518

 
$
6,643

Finished goods
8,447

 
10,934

Total inventory
$
14,965

 
$
17,577

 
 
 
 


Property and Equipment, Net

Property and equipment, net, consisted of the following (in thousands):
 
Useful Life
 
June 30,
2018
 
December 31,
2017
 
(in years)
 

Equipment
1-3
 
$
49,821

 
$
47,817

Software
1-3
 
4,022

 
3,988

Furniture and fixtures
1-3
 
951

 
950

Leasehold improvements
2-8
 
3,824

 
3,824

Construction in progress
 
 
38

 

Property and equipment, gross
 
 
58,656

 
56,579

Less: accumulated depreciation
 
 
(49,980
)
 
(46,666
)
Property and equipment, net
 
 
$
8,676

 
$
9,913

 
 
 
 
 
 


Depreciation expense on property and equipment was $1.7 million and $1.8 million for the three months ended June 30, 2018 and 2017, respectively, and $3.4 million and $3.6 million for the six months ended June 30, 2018, respectively.

Intangible Assets

Purchased intangible assets, net, consisted of the following (in thousands):
 
June 30, 2018
 
December 31, 2017
 
Cost
 
Accumulated Amortization
 
Net
 
Cost
 
Accumulated Amortization
 
Net
Developed technology
$
5,050

 
$
(2,020
)
 
$
3,030

 
$
5,050

 
$
(1,515
)
 
$
3,535

Patents
2,936

 
(1,497
)
 
1,439

 
2,936

 
(1,281
)
 
1,655

Total
$
7,986

 
$
(3,517
)
 
$
4,469

 
$
7,986

 
$
(2,796
)
 
$
5,190

 
 
 
 
 
 
 
 
 
 
 
 


Amortization expense related to purchased intangible assets was $0.3 million and $0.4 million each for the three months ended June 30, 2018 and 2017, and $0.7 million for each of the six months ended June 30, 2018 and 2017. Purchased intangible assets will be amortized over a remaining weighted average useful life of 3.1 years.

Future amortization expense for purchased intangible assets as of June 30, 2018 is as follows (in thousands):
Fiscal Year
 
 
Remainder of 2018
 
$
722

2019
 
1,442

2020
 
1,442

2021
 
863

 
 
$
4,469

 
 
 


Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):
 
June 30,
2018
 
December 31,
2017
Accrued compensation and benefits
$
13,210

 
$
13,828

Accrued tax liabilities
3,459

 
2,985

Other
8,485

 
5,022

Total accrued liabilities
$
25,154

 
$
21,835

 
 
 
 


Deferred Revenue

Deferred revenue consisted of the following (in thousands):
 
June 30,
2018
 
December 31,
2017
Deferred revenue:
 
 
 
Products
$
6,771

 
$
6,161

Services
91,312

 
88,476

Total deferred revenue
98,083

 
94,637

Less: current portion
(64,907
)
 
(61,858
)
Non-current portion
$
33,176

 
$
32,779