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Balance Sheet Details
 12 Months Ended
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]  
Balance Sheet Details
Balance Sheet Details
Inventories
Inventories consist of the following:
 
As of December 31,
 
2017
 
2016
 
(In thousands)
Raw materials
$
2,976

 
$
3,773

Work in process
1,109

 
616

Finished goods
1,074

 
1,244

 
$
5,159

 
$
5,633


Property, Plant and Equipment, net
Property, plant and equipment, net is comprised of the following:
 
As of December 31,
 
2017
 
2016
 
(In thousands)
Building
$
40,320

 
$
40,320

Computer software
18,424

 
20,922

Computer equipment
36,607

 
36,608

Furniture and fixtures
16,881

 
15,140

Leasehold improvements
10,110

 
7,176

Machinery
16,936

 
17,406

Construction in progress
1,831

 
1,075

 
141,109

 
138,647

Less accumulated depreciation and amortization
(86,806
)
 
(80,205
)
 
$
54,303

 
$
58,442


Depreciation expense for the years ended December 31, 2017, 2016 and 2015 was $13.3 million, $13.0 million and $12.4 million, respectively.
Accumulated Other Comprehensive Gain (Loss)
Accumulated other comprehensive gain (loss) is comprised of the following:
 
As of December 31,
 
2017
 
2016
 
(In thousands)
Foreign currency translation adjustments
$
(5,593
)
 
$
(13,392
)
Unrealized gain (loss) on available-for-sale securities, net of tax
496

 
(116
)
Total
$
(5,097
)
 
$
(13,508
)