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Balance Sheet Details (Tables)
6 Months Ended
Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]  
Summary of accounts receivable, net
Accounts receivable, net consisted of the following (in thousands):
 
 
June 30,
2018
 
December 31,
2017
Accounts receivable
 
$
70,031

 
$
81,793

Allowance for doubtful accounts
 
(496
)
 
(579
)
Product return reserve (1)
 

 
(822
)
 
 
$
69,535

 
$
80,392


(1)
With adoption of Topic 606 on January 1, 2018, the product return reserve is considered a contract liability and has been reclassified to accrued liabilities.
Summary of inventory
Inventory consisted of the following (in thousands):
 
 
June 30,
2018
 
December 31,
2017
Raw materials
 
$
2,090

 
$
1,211

Finished goods
 
17,898

 
30,318

 
 
$
19,988

 
$
31,529

Summary of property and equipment, net
Property and equipment, net consisted of the following (in thousands):
 
 
June 30,
2018
 
December 31,
2017
Test equipment
 
$
42,730

 
$
39,952

Computer equipment and software
 
33,717

 
32,175

Furniture and fixtures
 
2,668

 
2,714

Leasehold improvements
 
5,189

 
6,029

Total
 
84,304

 
80,870

Accumulated depreciation and amortization
 
(68,747
)
 
(65,189
)
 
 
$
15,557

 
$
15,681

Summary of accrued liabilities
Accrued liabilities consisted of the following (in thousands):
 
 
June 30,
2018
 
December 31,
2017
Accrued compensation and related benefits
 
$
16,052

 
$
15,563

Accrued warranty and retrofit
 
8,188

 
8,708

Accrued professional and consulting fees
 
7,877

 
9,604

Accrued restructuring charges
 
1,764

 
1,417

Accrued excess and obsolete inventory at contract manufacturers
 
3,254

 
2,430

Accrued non-income related taxes
 
1,128

 
1,778

Accrued customer rebates
 
1,239

 
382

Customer over payments
 
1,014

 
1,050

Product return reserve
 
937

 

Accrued insurance
 
678

 
827

Accrued freight
 
918

 
593

Accrued business events
 
62

 
1,272

Accrued other
 
4,334

 
5,655

 
 
$
47,445

 
$
49,279

Product warranty activities
Changes in the Company’s warranty and retrofit reserves in the periods as indicated were as follows (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Balance at beginning of period
 
$
8,097

 
$
10,778

 
$
8,708

 
$
12,214

Provision for warranty and retrofit charged to cost of revenue
 
1,560

 
1,743

 
3,029

 
3,605

Utilization of reserve
 
(1,469
)
 
(3,256
)
 
(3,549
)
 
(6,554
)
Balance at end of period
 
$
8,188

 
$
9,265

 
$
8,188

 
$
9,265

Summary of restructuring activities
The following table summarizes the activities pursuant to the above restructuring plans (in thousands):
 
 
Severance and Related Benefits
 
Facilities
 
Total
Balance at December 31, 2017
 
$
975

 
$
442

 
$
1,417

Restructuring charges
 
5,360

 
773

 
6,133

Cash payments
 
(5,208
)
 
(578
)
 
(5,786
)
Balance at June 30, 2018
 
$
1,127

 
$
637

 
$
1,764

Summary of deferred revenue
Deferred revenue consisted of the following (in thousands):
 
 
June 30,
2018
 
December 31,
2017
Current:
 
 
 
 
Products and services
 
$
12,627

 
$
9,125

Extended warranty
 
4,578

 
3,951

 
 
17,205

 
13,076

Long-term:
 
 
 
 
Products and services
 
536

 
18

Extended warranty
 
17,961

 
20,627

 
 
18,497

 
20,645

 
 
$
35,702

 
$
33,721