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Consolidated Statements of Operations - USD ($)
shares in Millions, $ in Millions

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Income Statement [Abstract]

Revenue

$ 1,391.7

$ 1,106.8

$ 844.8

Cost of revenue

^[1]

394.7

368.9

390.6

Gross profit

997.0

737.9

454.2

Operating expenses

Research and development

^[2]

768.2

^[3]

380.3

^[3]

289.7

^[1]

Sales and marketing

^[2]

439.6

^[3]

314.0

^[3]

250.6

^[1]

General and administrative

^[2],[3]

283.2

157.3

107.4

^[1]

Total operating expenses

1,491.0

^[2],[3]

851.6

^[2],[3]

647.7

Loss from operations

(494.0)

(113.7)

(193.5)

Interest income (expense), net

7.1

(11.0)

(16.4)

Other income, net

6.8

13.2

4.9

Loss before income taxes

(480.1)

(111.5)

(205.0)

Provision for income taxes

(4.8)

(0.2)

(5.2)

Net loss

$ (484.9)

$ (111.7)

$ (210.2)

Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)

$ (1.35)

$ (0.57)

$ (1.11)

Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)

358.6

195.9

189.1

[1]	Includes stock-based compensation as follows (in millions): for the twelve months ended December 31, 2018, 2017, and 2016. Cost of Revenues of $47.0 million, $12.2 million, and $8.2 million. Research and development of $368.2 million, 93.1 million, and 72.7 million. Sales and marketing of $94.3 million, 33.7 million, and 44.6 million. General and administrative of $140.6 million, 25.6 million, and 22.1 million, respectively.
[2]	During the year ended December 31, 2018, the Company recognized the cumulative unrecognized stock-based compensation of $418.7 million related to the two-tier restricted stock units upon the effectiveness of the Company's registration statement for its initial public offering. See Note 1, "Description of the Business and Summary of Significant Accounting Policies" for further details.
[3]	During the year ended the year ended December 31, 2017, general and administrative expense includes $9.4 million for a non-cash charitable contribution and $1.9 million of cash contributions to the Dropbox Charitable Foundation, a related party. See Note 14, "Related Party Transactions" for further details.

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