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Balance Sheets and Statements of Operations Components (Tables)
3 Months Ended
Mar. 31, 2016
Property, Plant and Equipment [Abstract]  
Schedule of Inventory
Components of inventory as of March 31, 2016 and December 31, 2015 are shown below (in thousands):

 
March 31,
2016
 
December 31,
2015
Raw materials
$
7,992

 
$
9,418

Finished goods
9,181

 
8,873

Total inventory
$
17,173

 
$
18,291

Schedule of Property and Equipment, Net
Components of property and equipment, net as of March 31, 2016 and December 31, 2015 are shown below (in thousands):

 
March 31,
2016
 
December 31,
2015
Equipment
$
37,094

 
$
35,836

Software
3,782

 
3,548

Furniture and fixtures
866

 
864

Leasehold improvements
2,536

 
2,492

Construction in progress
83

 
83

Property and equipment, gross
44,361

 
42,823

Less: accumulated depreciation and amortization
(35,720
)
 
(33,920
)
Total property and equipment, net
$
8,641

 
$
8,903

Schedule of Deferred Revenue
Deferred revenue as of March 31, 2016 and December 31, 2015 consists of the following (in thousands):

 
March 31,
2016
 
December 31,
2015
Deferred revenue:
 
 
 
Products
$
2,974

 
$
3,233

Services
71,869

 
69,571

Total deferred revenue
74,843

 
72,804

Less: current portion
(50,718
)
 
(49,572
)
Non-current portion
$
24,125

 
$
23,232

Schedule of Accrued Liabilities
Accrued liabilities as of March 31, 2016 and December 31, 2015 consists of the following (in thousands):

 
March 31,
2016
 
December 31,
2015
Accrued compensation and benefits
$
17,079

 
$
18,134

Accrued tax liabilities
2,025

 
4,520

Other
5,338

 
5,103

Total accrued liabilities
$
24,442

 
$
27,757