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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Summary of Property and Equipment Useful Life Property and equipment, net, are stated at cost, subject to review of impairment, and depreciated using the straight-line method over the estimated useful lives of the assets as follows:
Building
 
39 years
Computer equipment and software
  
3-5 years
Furniture and fixtures
  
3-7 years
Leasehold and other improvements
  
shorter of the lease term or estimated useful life

Property and equipment, net consists of the following (in thousands):
 
December 31,
 
2018
 
2017
Computer equipment
$
493,536

 
$
326,378

Computer software
58,303

 
46,413

Leasehold and other improvements
74,721

 
56,232

Furniture and fixtures
42,551

 
38,789

Building
6,551

 
7,084

Construction in progress
10,167

 
5,341

 
685,829

 
480,237

Less: Accumulated depreciation
(338,613
)
 
(235,113
)
Total property and equipment, net
$
347,216

 
$
245,124
Changes in Allowance for Doubtful Accounts The following table presents the changes in the allowance for doubtful accounts (in thousands):
 
Balance at Beginning of Year
 
Additions (Deductions): Charged to Operations
 
Additions (Deductions): Charged to Deferred Revenue
 
Less:
Write-offs
 
Balance at End of Year
Year ended December 31, 2018
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
3,115

 
1,255

 
1,177

 
898

 
$
4,649

Year ended December 31, 2017
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
2,323

 
1,688

 
194

 
1,090

 
$
3,115

Year ended December 31, 2016
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
1,179

 
2,219

 
(391
)
 
684

 
$
2,323
Schedule of New Accounting Pronouncements and Changes in Accounting Principals The table below provides specified line items from our consolidated balance sheet (i) as previously reported and (ii) as adjusted to reflect the impact of the full retrospective adoption of Topic 606 (in thousands):
 
Year Ended December 31, 2017
 
As Reported
 
As Adjusted
 
 
 
 
Assets
 
 
 
Accounts receivable, net
$
434,895

 
$
437,051

Current portion of deferred commissions
118,690

 
109,643

Prepaid expenses and other current assets
77,681

 
95,959

Deferred commissions, less current portion
85,530

 
224,252

Other assets
49,600

 
51,832

Liabilities
 
 
 
Accrued expenses and other current liabilities
244,605

 
253,257

Current portion of deferred revenue
1,280,499

 
1,210,695

Deferred revenue, less current portion
39,884

 
36,120

Other long-term liabilities
43,239

 
65,884

Stockholder’s equity
 
 
 
Accumulated other comprehensive (loss) income
(889
)
 
5,767

Accumulated deficit
(1,146,520
)
 
(958,564
)
The table below provides specified line items from our consolidated statement of comprehensive loss (i) as previously reported and (ii) as adjusted to reflect the impact of the full retrospective adoption of Topic 606 (in thousands, except per share data):

 
Year Ended December 31,
 
2017
 
2016
 
As Reported
 
As Adjusted
 
As Reported
 
As Adjusted
Revenues:
 
 
 
 
 
 
 
Subscription and software
$
1,739,795

 
$
1,739,500

 
$
1,221,639

 
$
1,234,070

Professional services and other
193,231

 
178,994

 
168,874

 
156,915

Total revenues
1,933,026

 
1,918,494

 
1,390,513

 
1,390,985

Cost of revenues:
 
 
 
 
 
 
 
Professional services and other
184,202

 
184,292

 
163,268

 
163,581

Total cost of revenues
499,772

 
499,862

 
398,682

 
398,995

Gross profit
1,433,254

 
1,418,632

 
991,831

 
991,990

Operating expenses:
 
 
 
 
 
 
 
Sales and marketing
946,617

 
894,977

 
700,464

 
659,983

Total operating expenses
1,534,668

 
1,483,028

 
1,414,639

 
1,374,158

Loss from operations
(101,414
)
 
(64,396
)
 
(422,808
)
 
(382,168
)
Interest income and other income (expense), net
5,804

 
4,384

 
6,035

 
5,027

Loss before income taxes
(149,004
)
 
(113,406
)
 
(450,051
)
 
(410,419
)
Provision for income taxes
126

 
3,440

 
1,753

 
3,830

Net loss
$
(149,130
)
 
$
(116,846
)
 
$
(451,804
)
 
$
(414,249
)
Net loss per share - basic and diluted
$
(0.87
)
 
$
(0.68
)
 
$
(2.75
)
 
$
(2.52
)
Weighted-average shares used to compute net loss per share - basic and diluted
171,175,577

 
171,175,577

 
164,533,823

 
164,533,823

The table below provides specified line items from our consolidated statement of cash flows (i) as previously reported and (ii) as adjusted to reflect the impact of the full retrospective adoption of Topic 606 (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
As Reported
 
As Adjusted
 
As Reported
 
As Adjusted
 
 
 
 
 
 
 
 
Cash flows from operating activities:
 
 
 
 
 
 
 
Net loss
$
(149,130
)
 
$
(116,846
)
 
$
(451,804
)
 
$
(414,249
)
Adjustments to reconcile net loss to net cash provided by operating activities:
 
 
 
 
 
 
 
Amortization of deferred commissions
115,262

 
99,105

 
81,217

 
69,565

Deferred income tax
(9,078
)
 
(5,724
)
 
(3,424
)
 
(658
)
Changes in operating assets and liabilities, net of effect of business combinations:
 
 
 
 
 
 
 
Accounts receivable
(98,432
)
 
(99,693
)
 
(125,106
)
 
(126,415
)
Deferred commissions
(174,503
)
 
(190,246
)
 
(136,459
)
 
(151,921
)
Prepaid expenses and other assets
(46,138
)
 
(34,288
)
 
(21,500
)
 
(24,164
)
Deferred revenue
381,562

 
369,242

 
300,167

 
285,139

Accrued expenses and other liabilities
68,344

 
66,526

 
82,681

 
87,560

Net cash provided by operating activities
642,825

 
642,940

 
159,921

 
159,081

Foreign currency effect on cash, cash equivalents and restricted cash
28,128

 
28,013

 
(6,785
)
 
(5,945
)