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Financial Statements Details (Tables)
9 Months Ended
Sep. 30, 2018
Balance Sheet Components [Abstract]  
Schedule of Cash, Cash Equivalents and Restricted Cash
The following table is a reconciliation of cash, cash equivalents and restricted cash reported within the accompanying condensed consolidated balance sheets that sum to the total of the same such amounts shown in the accompanying condensed consolidated statements of cash flows (in thousands):
 
 
September 30, 2018
 
September 30, 2017
Cash and cash equivalents
 
$
524,687

 
$
854,479

Restricted cash included in other assets
 
4,210

 
5,502

Total cash, cash equivalents and restricted cash
 
$
528,897

 
$
859,981

Schedule of Accounts Receivable
Accounts receivable, net consists of the following (in thousands):
 
 
September 30, 2018
 
December 31, 2017
Accounts receivable
 
$
333,304

 
$
254,881

Allowance for doubtful accounts
 
(498
)
 
(112
)
Product sales rebate and returns reserve
 
(10,753
)
 
(7,423
)
Accounts receivable, net
 
$
322,053

 
$
247,346


Schedule of Inventories
Inventories consist of the following (in thousands):
 
 
September 30, 2018
 
December 31, 2017
Raw materials
 
$
48,697

 
$
69,673

Finished goods
 
167,616

 
236,525

Total inventories
 
$
216,313

 
$
306,198

Schedule of Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consists of the following (in thousands):
 
 
September 30, 2018
 
December 31, 2017
Inventory deposit
 
$
19,290

 
$
34,141

Prepaid income taxes
 
83,598

 
38,134

Other current assets
 
118,262

 
96,215

Other prepaid expenses and deposits
 
14,731

 
8,840

Total prepaid expenses and other current assets
 
$
235,881

 
$
177,330

Schedule of Property and Equipment, net
Property and equipment, net consists of the following (in thousands):
 
 
September 30, 2018
 
December 31, 2017
Equipment and machinery
 
$
54,169

 
$
47,711

Computer hardware and software
 
28,549

 
22,124

Furniture and fixtures
 
3,641

 
3,020

Leasehold improvements
 
36,350

 
30,548

Building
 
35,154

 
35,154

Construction-in-process
 
1,931

 
4,742

Property and equipment, gross
 
159,794

 
143,299

Less: accumulated depreciation
 
(84,397
)
 
(69,020
)
Property and equipment, net
 
$
75,397

 
$
74,279

Schedule of Accrued Liabilities
Accrued liabilities consist of the following (in thousands):
 
 
September 30, 2018
 
December 31, 2017
Accrued payroll related costs
 
$
55,422

 
$
56,626

Accrued manufacturing costs
 
21,282

 
35,703

Accrued product development costs
 
7,552

 
21,201

Accrued warranty costs
 
10,115

 
7,415

Accrued professional fees
 
6,262

 
7,086

Accrued taxes
 
770

 
794

Other
 
1,705

 
5,002

Total accrued liabilities
 
$
103,108

 
$
133,827

Schedule of Warranty Accrual
The following table summarizes the activity related to our accrued liability for estimated future warranty costs (in thousands):
 
 
Nine Months Ended September 30,
 
 
2018
 
2017
Warranty accrual, beginning of period
 
$
7,415

 
$
6,744

Liabilities accrued for warranties issued during the period
 
6,898

 
5,020

Warranty costs incurred during the period
 
(4,198
)
 
(3,478
)
Warranty accrual, end of period
 
$
10,115

 
$
8,286

Schedule of Contract Balances
The following table summarizes the activity related to our contract assets (in thousands):
 
 
Three Months Ended
September 30, 2018
 
Nine Months Ended
September 30, 2018
Contract assets, beginning balance
 
$
6,959

 
$

Less: Beginning balance reclassified to accounts receivable upon invoice
 
(1,505
)
 

Add: Contract assets recognized
 
3,963

 
9,417

Contract assets, ending balance
 
$
9,417

 
$
9,417

The following table summarizes the activity related to our contract liabilities (in thousands):
 
 
Three Months Ended
September 30, 2018
 
Nine Months Ended
September 30, 2018
Contract liabilities, beginning balance
 
$
21,842

 
$
16,521

Less: Revenue recognized from beginning balance
 
(2,157
)
 
(6,107
)
Less: Beginning balance reclassified to deferred revenue
 
(970
)
 
(521
)
Add: Contract liabilities recognized
 
6,580

 
15,402

Contract liabilities, ending balance
 
$
25,295

 
$
25,295

Schedule of Deferred Revenue
Deferred revenue is comprised mainly of unearned revenue related to multi-year PCS contracts, services and product deferrals related to acceptance clauses. The following table summarizes the activity related to our deferred revenue (in thousands):
 
 
Three Months Ended
September 30, 2018
 
Nine Months Ended
September 30, 2018
 
Deferred revenue, beginning balance
 
$
448,644

 
$
498,740

(1) 
Less: Revenue recognized from beginning balance
 
(97,995
)
 
(306,350
)
 
Add: Deferral of revenue in current period, excluding amounts recognized during the period
 
179,206

 
337,465

 
Deferred revenue, ending balance
 
$
529,855

 
$
529,855

 
_________________________________
 
 
 
 
 
(1) The beginning balance of the nine months ended September 30, 2018 excluded the $16.5 million that was reclassified to other current liabilities and other long-term liabilities at January 1, 2018 as a result of our adoption of ASC 606. See Note 1 for details.
 
Schedule of Other Income (Expense), Net
Other income (expense), net consists of the following (in thousands):
 
 
Three Months Ended 
 September 30, 2018
 
Nine Months Ended 
 September 30, 2018
 
 
2018
 
2017
 
2018
 
2017
Interest income
 
$
8,585

 
$
2,332

 
$
21,933

 
$
4,889

Unrealized loss on investments in privately-held companies, net
 

 

 
(9,100
)
 

Other income (expense)
 
707

 
(196
)
 
(187
)
 
(609
)
Total
 
$
9,292

 
$
2,136

 
$
12,646

 
$
4,280