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Condensed Consolidated Financial Statement Details (Tables)
3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of Inventory
Inventory consisted of the following (in thousands):
 
March 31,
2019
 
December 31,
2018
Raw materials
$
8,502

 
$
7,979

Finished goods
12,450

 
9,951

Total inventory
$
20,952

 
$
17,930

 
 
 
 
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
 
March 31,
2019
 
December 31,
2018
Prepaid expenses
$
6,675

 
$
6,679

Deferred contract acquisition costs
5,711

 
6,564

Other
4,727

 
1,419

       Total prepaid and other current assets
$
17,113

 
$
14,662

 
 
 
 
Schedule of Property and Equipment, Net
Property and equipment, net, consisted of the following (in thousands):
 
Useful Life
 
March 31,
2019
 
December 31,
2018
 
(in years)
 

Equipment
1-3
 
$
49,230

 
$
49,804

Software
1-3
 
4,108

 
4,088

Furniture and fixtures
1-3
 
967

 
967

Leasehold improvements
2-8
 
3,834

 
3,832

Construction in progress
 
 
692

 
160

Property and equipment, gross
 
 
58,831

 
58,851

Less: accumulated depreciation
 
 
(51,155
)
 
(51,589
)
Property and equipment, net
 
 
$
7,676

 
$
7,262

 
 
 
 
 
 
Schedule of Acquired Intangible Assets
Purchased intangible assets, net, consisted of the following (in thousands):
 
March 31, 2019
 
December 31, 2018
 
Cost
 
Accumulated Amortization
 
Net
 
Cost
 
Accumulated Amortization
 
Net
Developed technology
$
5,050

 
$
(2,778
)
 
$
2,272

 
$
5,050

 
$
(2,525
)
 
$
2,525

Patents
2,936

 
(1,821
)
 
1,115

 
2,936

 
(1,713
)
 
1,223

Total
$
7,986

 
$
(4,599
)
 
$
3,387

 
$
7,986

 
$
(4,238
)
 
$
3,748

 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Future Amortization Expense for Purchased Finite-lived Intangible Assets
Future amortization expense for purchased intangible assets as of March 31, 2019 is as follows (in thousands):
Fiscal Year
 
 
Remainder of 2019
 
$
1,082

2020
 
1,442

2021
 
863

 
 
$
3,387

 
 
 
Schedule of Accrued Liabilities
Accrued liabilities consisted of the following (in thousands):
 
March 31,
2019
 
December 31,
2018
Accrued compensation and benefits
$
11,605

 
$
15,283

Accrued tax liabilities
5,555

 
4,455

Other
8,276

 
5,553

Total accrued liabilities
$
25,436

 
$
25,291

 
 
 
 
Schedule of Deferred Revenue
Deferred revenue consisted of the following (in thousands):
 
March 31,
2019
 
December 31,
2018
Deferred revenue:
 
 
 
Products
$
5,529

 
$
5,216

Services
93,040

 
92,750

Total deferred revenue
98,569

 
97,966

Less: current portion
(62,528
)
 
(63,874
)
Non-current portion
$
36,041

 
$
34,092