Criteo (CRTO) 10-Q 8 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	Criteo S.A.
Entity Central Index Key	1,576,427
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Entity Common Stock, Shares Outstanding		65,298,460

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 308,185	$ 270,317
Trade receivables, net of allowances	370,052	397,244
Income taxes	6,872	2,741
Other taxes	46,514	52,942
Other current assets	28,270	19,340
Total current assets	759,893	742,584
Property, plant and equipment, net	131,346	108,581
Intangible assets, net	104,045	102,944
Goodwill	235,337	209,418
Non-current financial assets	18,824	17,029
Deferred tax assets	48,700	30,630
Total non-current assets	538,252	468,602
Total assets	1,298,145	1,211,186
Current liabilities:
Trade payables	351,408	365,788
Contingencies	1,392	654
Income taxes	11,898	14,454
Financial liabilities - current portion	5,851	7,969
Other taxes	45,606	44,831
Employee - related payables	64,467	55,874
Other current liabilities	37,906	30,221
Total current liabilities	518,528	519,791
Deferred tax liabilities	28,088	686
Retirement benefit obligation	3,405	3,221
Financial liabilities - non current portion	2,621	77,611
Other non-current liabilities	2,824	0
Total non-current liabilities	36,938	81,518
Total liabilities	555,466	601,309
Commitments and contingencies
Shareholders' equity:
Common shares, €0.025 per value, 63,978,204 and 65,291,977 shares authorized, issued and outstanding at December 31, 2016 and June 30, 2017, respectively.	2,128	2,093
Additional paid-in capital	540,998	488,277
Accumulated other comprehensive (loss)	(42,615)	(88,593)
Retained earnings	228,141	198,355
Equity-attributable to shareholders of Criteo S.A.	728,652	600,132
Non-controlling interests	14,027	9,745
Total equity	742,679	609,877
Total equity and liabilities	$ 1,298,145	$ 1,211,186

CONDENSED CONSOLIDATED STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (UNAUDITED) (PARENTHETICAL) - € / shares	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common shares, par value (in Euro per share)	€ 0.025	€ 0.025
Common shares authorized (in shares)	65,291,977	63,978,204
Common shares issued (in shares)	65,291,977	63,978,204
Common shares outstanding (in shares)	65,291,977	63,978,204

CONDENSED CONSOLIDATED STATEME4

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 542,022	$ 407,201	$ 1,058,688	$ 808,454
Cost of revenue:
Traffic acquisition costs	(322,200)	(240,969)	(628,893)	(479,724)
Other cost of revenue	(32,808)	(20,279)	(59,963)	(38,618)
Gross profit	187,014	145,953	369,832	290,112
Operating expenses:
Research and development expenses	(43,611)	(30,235)	(83,132)	(57,396)
Sales and operations expenses	(97,900)	(69,225)	(188,631)	(133,698)
General and administrative expenses	(32,239)	(28,610)	(63,754)	(53,347)
Total operating expenses	(173,750)	(128,070)	(335,517)	(244,441)
Income from operations	13,264	17,883	34,315	45,671
Financial income (expense)	(2,094)	(94)	(4,427)	(1,412)
Income before taxes	11,170	17,789	29,888	44,259
Provision for income taxes	(3,665)	(4,450)	(7,866)	(12,394)
Net income	7,505	13,339	22,022	31,865
Net income available to shareholders of Criteo S.A.	5,970	12,200	18,411	29,330
Net income available to non-controlling interests	$ 1,535	$ 1,139	$ 3,611	$ 2,535
Net income allocated to shareholders of Criteo S.A. per share:
Net income allocated to shareholders per share, Basic (in USD per share)	$ 0.09	$ 0.19	$ 0.28	$ 0.47
Net income allocated to shareholders per share, Diluted (in USD per share)	$ 0.09	$ 0.19	$ 0.27	$ 0.45
Weighted average shares outstanding used in computing per share amounts, Basic (in shares)	65,027,985	63,246,785	64,611,237	62,928,221
Weighted average shares outstanding used in computing per share amounts, Diluted (in shares)	68,131,274	65,625,097	67,709,789	65,232,938

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 7,505	$ 13,339	$ 22,022	$ 31,865
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Foreign currency translation differences, net of taxes	36,762	(10,660)	45,854	10,028
Foreign currency translation differences	36,762	(10,660)	45,854	10,028
Income tax effect	0	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Actuarial (losses) gains on employee benefits, net of taxes	337	(10)	590	(209)
Actuarial losses on employee benefits	401	(11)	698	(251)
Income tax effect	(64)	1	(108)	42
Comprehensive income (loss)	44,604	2,669	68,466	41,684
Comprehensive income (loss), Attributable to shareholders of Criteo S.A	43,097	878	64,390	38,122
Comprehensive income, Attributable to non-controlling interests	$ 1,507	$ 1,791	$ 4,076	$ 3,562

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Cash from operating activities
Net income		$ 7,505	$ 13,339	$ 22,022	$ 31,865
Non-cash and non-operating items [Abstract]
Non-cash and non-operating items		42,974	30,121	84,448	59,626
- Amortization and provisions		24,376	16,345	46,692	29,525
- Equity awards compensation expense	[1]	14,918	7,695	29,858	16,065
- Interests accrued and non-cash financial income and expenses		15	1,586	32	1,598
- Change in deferred taxes		(5,536)	(3,285)	(12,405)	(4,424)
- Income tax for the period		9,201	7,780	20,271	16,862
Change in working capital requirement
Change in working capital requirement		25,860	(10,297)	25,790	(27,436)
- Decrease in trade receivables		(23,358)	(7,126)	36,211	(2,368)
- Decrease in trade payables		48,776	(1,244)	(26,254)	(15,149)
- (Increase)/Decrease in other current assets		(3,493)	(5,969)	2,580	(15,777)
- Increase in other current liabilities		3,935	4,042	13,253	5,858
Income taxes paid		(15,848)	(13,889)	(27,531)	(25,874)
Cash from operating activities		60,491	19,274	104,729	38,181
Cash used in investing activities
Acquisition of intangibles assets, property, plant and equipment		(30,008)	(25,564)	(53,275)	(39,178)
Change in accounts payable related to intangible assets, property, plant and equipment		2,953	3,178	(1,986)	4,685
Payments for acquired business, net of cash acquired		1,089	(5,074)	1,052	(5,074)
Change in other financial non-current assets		1,668	(207)	1,274	574
Cash used in investing activities		(24,298)	(27,667)	(52,935)	(38,993)
Cash used in investing activities
Issuance of long-term borrowings		1,454	2,295	1,454	3,059
Repayment of borrowings		(77,168)	(3,944)	(79,221)	(5,448)
Proceeds from capital increase		11,517	10,106	24,454	15,582
Change in other financial liabilities		145	(171)	264	(171)
Cash from financing activities		(64,052)	8,286	(53,049)	13,022
Change in net cash and cash equivalents		(27,859)	(107)	(1,255)	12,210
Net cash and cash equivalents - beginning of period		303,813	386,110	270,317	353,537
Effect of exchange rate changes on cash and cash equivalents		32,231	(8,596)	39,123	11,660
Net cash and cash equivalents - end of period		308,185	377,407	308,185	377,407
Share-based compensation expense		$ 14,704	$ 7,233	$ 29,287	$ 15,514
[1]	Of which $7.2 million and $14.7 million of equity awards compensation expense consisted of share-based compensation expense according to ASC 718 Compensation - stock compensation for the quarter ended June 30, 2016 and 2017, respectively, and $15.5 million and $29.3 million of equity awards compensation expense consisted of share-based compensation expense according to ASC 718 Compensation - stock compensation for the six month period ended June 30, 2016 and 2017, respectively.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Criteo S.A. is a global technology company specialized in digital performance marketing. We strive to deliver post-click sales to our advertiser clients at scale and according to the client's targeted return on investment. In these notes, Criteo S.A. is referred to as the "Parent" company and together with its subsidiaries, collectively, as "Criteo," the "Company," the "Group," or "we". The Company uses its proprietary predictive software algorithms coupled with its deep insights into expressed consumer intent and purchasing habits to price and deliver highly relevant and personalized performance advertisements to consumers in real time. Summary of Significant Accounting Policies Basis of Presentation The unaudited condensed consolidated financial statements included herein have been prepared by Criteo S.A. pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in the Company's Annual Report filed on Form 10-K for the year ended December 31, 2016 , filed with the SEC on March 1, 2017. The unaudited condensed consolidated financial statements included herein reflect all adjustments (consisting of normal, recurring adjustments) which are, in the opinion of management, necessary to state fairly the results for the interim periods presented. The results of operations for the interim periods presented are not necessarily indicative of the operating results to be expected for any subsequent interim period or for the fiscal year. Conformity with U.S. GAAP requires the use of estimates and judgments that affect the reported amounts of assets, liabilities, revenue and expenses in the condensed consolidated financial statements and accompanying notes. We base our estimates and judgments on historical information and on various other assumptions that we believe are reasonable under the circumstances. Our actual results may differ from these estimates. U.S. GAAP requires us to make estimates and judgments in several areas, including, but not limited to: (1) the recognition of revenue and particularly the determination as to whether revenue should be reported on a gross or a net basis; (2) the evaluation of our trade receivables and the recognition of a valuation allowance for doubtful accounts; (3) the recognition and measurement of goodwill and intangible assets and particularly costs capitalized in relation to our customized internal-use software; (4) the measurement of share-based compensation and (5) the tax provision determination and particularly the estimate of our annual effective tax rate based on applicable tax rates. There have been no changes to our significant accounting policies described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2016 that have had a material impact on our unaudited condensed consolidated financial statements and related notes. Accounting Pronouncements adopted in 2017 From January 1, 2017, we adopted ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvement to Employee Share-based Payment Accounting issued by the Financial Accounting Standards Board (FASB), which among other items, simplifies certain aspects of the accounting for share-based payment transactions to employees. The new standard particularly requires excess tax benefits and tax deficiencies to be recorded in the statements of income as a component of the provision for income taxes when stock awards vest or are settled. The effective date is January 1, 2017. Upon adoption, a cumulative effect of $10.0 million of this change has been recognized through retained earnings. The adoption of the standard also resulted in a current year tax expense of $1.4 million which previously would have been recognized in the current period in additional paid-in capital. Accounting Pronouncements not yet adopted In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805) ("ASU 2017-01") the purpose of which is to change the definition of a business to assist entities in evaluating when a set of transferred assets and activities is a business. This update will be effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The adoption of ASU 2017-01 is not expected to have a material impact on our financial position or results of operations. In January 2017, the FASB issued ASU 2017-04 Goodwill and Other (Topic 350) . ASU 2017-04 simplifies the subsequent measurement of goodwill and reduces the cost and complexity of evaluating goodwill for impairment. It eliminates the need for entities to calculate the implied fair value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination. Under this amendment, an entity will perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge is recognized for the amount by which the carrying value exceeds the reporting unit's fair value. This update will be effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. The adoption of ASU 2017-04 is not expected to have a material impact on our financial position or results of operations. In March 2017, FASB issued ASU 2017-07 Compensation-Retirements Benefits (Topic 715). ASU 2017-07 requires that an employer disaggregate the service cost component from the other components of net benefit cost. The amendments also provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. The amendments in ASU 2017-07 improve the consistency, transparency, and usefulness of financial information to users that have communicated that the service cost component generally is analyzed differently from the other components of net benefit cost. This update will be effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. The amendments in ASU 2017-07 should be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic post-retirement benefit cost in the income statement and prospectively, on and after the effective date, for the capitalization of the service cost component of net periodic pension cost and net periodic post-retirement benefit in assets. We intend to adopt the standard on the effective date of January 1, 2018. The adoption of ASU 2017-07 is not expected to have a material impact on our financial position or results of operations. In May 2017, the FASB issued ASU 2017-09 Compensation - Stock Compensation (Topic 718) . ASU 2017-09 was issued to provide clarity and reduce diversity in practice and complexity when applying the guidance in Topic 718 to a change in terms or conditions of a share based payment award. The amendments are effective for annual periods and interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted and should be applied prospectively to an award modified on or after the adoption date. To date, Criteo has not yet had any modifications of its share-based awards. We intend to adopt the standard on the effective date of January 1, 2018. The adoption of ASU 2017-09 is not expected to have a material impact on our financial position or results of operations.

Significant Events and Transact

Significant Events and Transactions of the Period	6 Months Ended
	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Significant Events and Transactions of the Period	Significant Events and Transactions of the Period Restructuring of our China Operations In May 2017, the Company announced it would no longer continue to serve the domestic market in China and would refocus its China operations entirely on the export business. As such, we have recorded $3.3 million in restructuring charges for the three months ended and the six months ended June 30, 2017, as follows: Three Months and Six Months Ended June 30, 2017 (in thousands) Severance costs $ 802 Facility Exit Costs 2,265 Other 232 Total restructuring costs $ 3,299 For the three months and six months ended June 30, 2017, $2.5 million was included in Other Cost of Revenue, $0.7 million in Sales and Operations expenses, and $0.1 million was included in General and Administrative expenses. The following table summarizes restructuring activities as of June 30, 2017 included in other current liabilities on the balance sheet: Six Months Ended June 30, 2017 (in thousands) Restructuring liability - April 1, 2017 $ — Restructuring charges 3,299 Amounts Paid (426 ) Restructuring liability - June 30, 2017 $ 2,873 Repayment of the amount drawn on the Group Revolving Credit Facility agreement As of December 31, 2016, $75.0 million was drawn on the Multicurrency Revolving Facility Agreement relating to the acquisition of HookLogic. This amount was re-paid in full during the second quarter of 2017 resulting in a nil balance as of June 30, 2017.

Financial Instruments

Financial Instruments	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Financial Instruments	Financial Instruments Credit Risk The maximum exposure to credit risk at the end of each reported period is represented by the carrying amount of financial assets, and summarized in the following table: December 31, 2016 June 30, 2017 Cash and cash equivalents $ 270,317 $ 308,185 Trade receivables, net of allowance 397,244 370,052 Other taxes 52,942 46,514 Other current assets 19,340 28,270 Non-current financial assets 17,029 18,824 Total $ 756,872 $ 771,845 As of December 31, 2016 and June 30, 2017 , no customer accounted for 10% or more of trade receivables. We perform ongoing credit evaluations of our customers and do not require collateral. We maintain an allowance for estimated credit losses. During the twelve-month period ended December 31, 2016 and the six-month period ended June 30, 2017, our allowance for doubtful accounts increased by $5.4 million and $3.1 million , respectively. For our financial assets, the fair value approximates the carrying amount, given the nature of the financial assets and the maturity of the expected cash flows. Fair Value Measurements We measure the fair value of our cash equivalents, which include money market funds and interest bearing deposits, as level 1 and level 2 measurements because they are valued using quoted market prices and observable market data, respectively. Financial assets or liabilities include derivative financial instruments used to manage our exposure to the risk of exchange rate fluctuations. These instruments are considered level 2 financial instruments as they are measured using valuation techniques based on observable market data. Trade Receivables Credit risk is defined as an unexpected loss in cash and earnings if the client is unable to pay its obligations in due time. We perform internal ongoing credit risk evaluations of our clients. When a possible risk exposure is identified, we require prepayments. For each period presented, the aging of trade receivables and allowances for potential losses is as follows: December 31, 2016 June 30, 2017 Gross value % Allowance % Gross value % Allowance % (in thousands) (in thousands) (in thousands) (in thousands) Not yet due $ 265,600 65.0 % $ — — % $ 309,417 80.5 % $ — — % 0 - 30 days 92,163 22.5 % (49 ) 0.4 % 12,107 3.1 % (23 ) 0.2 % 31 - 60 days 19,747 4.8 % (182 ) 1.6 % 20,140 5.2 % (27 ) 0.2 % 61 - 90 days 6,055 1.5 % (191 ) 1.6 % 12,640 3.3 % (200 ) 1.4 % > 90 days 25,277 6.2 % (11,176 ) 96.4 % 30,466 7.9 % (14,468 ) 98.2 % Total $ 408,842 100.0 % $ (11,598 ) 100.0 % $ 384,770 100.0 % $ (14,718 ) 100.0 % Financial Liabilities December 31, 2016 Carrying Value Fair value (in thousands) Trade payables $ 365,788 $ 365,788 Other taxes 44,831 44,831 Employee-related payables 55,874 55,874 Other current liabilities 30,221 30,221 Financial liabilities 85,580 85,580 Total $ 582,294 $ 582,294 June 30, 2017 Carrying Value Fair value (in thousands) Trade payables $ 351,408 $ 351,408 Other taxes 45,606 45,606 Employee-related payables 64,467 64,467 Other current liabilities 37,906 37,906 Financial liabilities 8,472 8,472 Total $ 507,859 $ 507,859 Derivative Financial Instruments Derivatives consist of foreign currency forward contracts that we use to hedge intercompany transactions and other monetary assets or liabilities denominated in currencies other than the local currency of a subsidiary. We recognize gains and losses on these contracts in financial income (expense), and their position on the balance sheet is based on their fair value at the end of each respective period. These instruments are considered level 2 financial instruments as they are measured using valuation techniques based on observable market data. December 31, 2016 Carrying Value Fair value (in thousands) Derivative Assets: Included in other current assets $ — $ — Derivative Liabilities: Included in financial liabilities - current portion $ 1,968 $ 1,968 June 30, 2017 Carrying Value Fair value (in thousands) Derivative Assets: Included in other current assets $ 4,600 $ 4,600 Derivative Liabilities: Included in financial liabilities - current portion $ — $ — Cash and Cash Equivalents Cash and cash equivalents include investments in money market funds and interest–bearing bank deposits which meet ASC 230— Statement of Cash flows criteria: short-term, highly liquid investments, for which the risks of changes in value are considered to be insignificant. Money market funds are considered level 1 financial instruments as they are valued using quoted market prices. Interest-bearing bank deposits are considered level 2 financial instruments as they are measured using valuation techniques based on observable market data. December 31, 2016 Carrying Value Fair value (in thousands) Cash $ 31,688 $ 31,688 Money market funds 88,091 88,091 Interest-bearing bank deposits 150,538 150,538 Total cash and cash equivalents $ 270,317 $ 270,317 June 30, 2017 Carrying Value Fair value (in thousands) Cash $ 197,994 $ 197,994 Money market funds — — Interest-bearing bank deposits 110,191 110,191 Total cash and cash equivalents $ 308,185 $ 308,185

Trade Receivables

Trade Receivables	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Trade Receivables	Trade Receivables The following table shows the breakdown in trade receivables net book value for the presented periods: December 31, 2016 June 30, 2017 (in thousands) Trade accounts receivables $ 408,842 $ 384,770 (Less) Allowance for doubtful accounts (11,598 ) (14,718 ) Net book value at end of period $ 397,244 $ 370,052 Changes in allowance for doubtful accounts are summarized below: 2016 2017 (in thousands) Balance at January 1 $ (6,264 ) $ (11,598 ) Allowance for doubtful accounts (4,652 ) (5,347 ) Reversal of provision 806 2,630 Currency translation adjustment (28 ) (403 ) Balance at June 30 $ (10,138 ) $ (14,718 ) The change in allowance for doubtful accounts during the first six months of 2017 related mainly to increased business with categories of clients associated with a higher credit risk.

Other Current Assets

Other Current Assets	6 Months Ended
	Jun. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets	Other Current Assets The following table shows the breakdown in other current assets net book value for the presented periods: December 31, 2016 June 30, 2017 (in thousands) Prepayments to suppliers $ 2,439 $ 3,970 Other debtors 3,263 6,930 Prepaid expenses 13,638 17,370 Gross book value at end of period 19,340 28,270 Net book value at end of period $ 19,340 $ 28,270 Prepaid expenses mainly consist of office rentals.

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible assets The changes in intangible assets since December 31, 2016 mainly relate to purchase accounting adjustments to technology and customer relationships following the finalization of the Monsieur Drive purchase price allocation as well as the preliminary purchase price allocation for HookLogic in which technology and customer relationships were identified as intangible assets. A change in this preliminary valuation may also impact the income tax related accounts. The amounts shown below may change in the near term as management continues to assess the fair value of acquired assets and liabilities within the twelve-month purchase price allocation period. December 31, 2016 June 30, 2017 Useful Lives (Years) Amounts recognized as of Acquisition Date (in millions) Useful Lives (Years) Amounts recognized as of Acquisition Date (in millions) Technology 3-5 years $ 34.1 3-5 years $ 29.8 Customer relationships 5-9 years 65.5 5-9 years 84.3 Total identifiable intangible assets acquired $ 99.6 $ 114.1 In addition, no triggering events have occurred which would indicate impairment in the balance of intangible assets. The estimated amortization expense related to intangible assets for the next five years and thereafter is as follows: Software Technology and customer relationships Total From July 1 to December 31, 2017 $ 3,309 $ 7,918 $ 11,227 2018 5,672 15,678 21,350 2019 3,310 13,972 17,282 2020 1,245 8,628 9,873 2021 395 8,628 9,023 Thereafter — 35,290 35,290 Total $ 13,931 $ 90,114 $ 104,045

Goodwill

Goodwill	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill Goodwill (in thousands) Balance at January 1, 2017 $ 209,418 Additions to goodwill 23,738 Currency translation adjustment 2,181 Balance at June 30, 2017 $ 235,337 Changes in goodwill since December 31, 2016 relate to purchase accounting adjustments to intangible assets regarding HookLogic, further to the preliminary purchase price allocation as well as the finalization of the Monsieur Drive purchase price allocation (note 6). In addition, no triggering events have occurred during the period which would indicate impairment in the balance of goodwill.

Other Current Liabilities

Other Current Liabilities	6 Months Ended
	Jun. 30, 2017
Other Liabilities Disclosure [Abstract]
Other Current Liabilities	Other Current Liabilities Other current liabilities are presented in the following table: December 31, 2016 June 30, (in thousands) Clients' prepayments $ 9,176 $ 15,246 Accounts payable relating to capital expenditures 15,484 14,153 Other creditors 2,440 8,066 Deferred revenue 3,121 441 Total $ 30,221 $ 37,906

Financial Liabilities

Financial Liabilities	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Financial Liabilities	Financial Liabilities The changes in current and non-current financial liabilities during the period ended June 30, 2017 are illustrated in the following schedules: As of January 1, 2017 New borrowings Repayments Change in scope Other (1) Currency translation adjustment As of June 30, 2017 (in thousands) Borrowings $ 5,524 $ 1,593 $ (79,360 ) $ — $ 77,436 $ 183 $ 5,376 Other financial liabilities 477 135 (241 ) — 70 34 475 Derivative instruments 1,968 — — — (2,020 ) 52 — Current portion 7,969 1,728 (79,601 ) — 75,486 269 5,851 Borrowings 77,397 — — — (77,436 ) 2,142 2,103 Other financial liabilities 214 360 — — (70 ) 14 518 Non current portion 77,611 360 — — (77,506 ) 2,156 2,621 Borrowings 82,921 1,593 (79,360 ) — — 2,325 7,479 Other financial liabilities 691 495 (241 ) — — 48 993 Derivative instruments 1,968 — — — (2,020 ) 52 — Total $ 85,580 $ 2,088 $ (79,601 ) $ — $ (2,020 ) $ 2,425 $ 8,472 (1) Includes reclassification from non-current to current portion based on maturity of the financial liabilities. Borrowings are financial liabilities at amortized cost and are measured using level 2 fair value measurements. We are party to several loan agreements and revolving credit facilities, or RCF, with third-party financial institutions. The only changes from what was disclosed in Note 14 to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016 are the amendment to the revolving credit facility entered into in September 2015, which, among other things, increased the facility amount from €250.0 million to €350.0 million and the amendment of the HSBC Chinese RCF which increased the facility amount from RMB 40.0 million to RMB 50.0 million .

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation The board of directors has been authorized by the general meeting of the shareholders to grant employee warrants (Bons de Souscription de Parts de Créateur d’Entreprise or "BSPCEs"), share options (Options de Souscription d'Actions or "OSAs"), free shares/restricted share units ("RSUs") and non-employee warrants ( Bons de Souscription d'Actions or "BSAs") . During the six months ended June 30, 2017, there were three grants of RSUs and one grant of OSAs under the Employee Share Option Plan 9 and one grant of BSAs under the Plan F, as defined in Note 19 to our audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2016. • On March 1, 2017, 231,460 RSUs were granted to Criteo employees subject to continued employment and 10,825 BSAs were granted to a board member subject to continued engagement on the board of directors. • On April 27, 2017, 139,386 RSUs were granted to Criteo employees subject to continued employment. • On June 27, 2017, 135,500 RSUs were granted to senior management subject to achievement of internal performance objectives and continued employment. Based on the assumptions known as of June 30, 2016, we determined share-based compensation expense by applying the probability of performance objectives completion. In addition, on June 27, 2017, 896,586 RSUs and 355,010 OSAs were granted to Criteo employees subject to continued employment. There have been no changes in the vesting and method of valuation of the BSPCEs, OSAs, RSUs, or BSAs from what was disclosed in Note 19 to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016, filed with the SEC on March 1, 2017. Change in Number of BSPCE/OSA/RSU/BSA OSA/BSPCE RSU BSA Total Balance at January 1, 2017 4,960,092 3,243,279 188,125 8,391,496 Granted 355,010 1,402,932 10,825 1,768,767 Exercised (1,270,417 ) — (43,356 ) (1,313,773 ) Forfeited (172,844 ) (186,516 ) — (359,360 ) Expired — — — — Balance at June 30, 2017 3,871,841 4,459,695 155,594 8,487,130 Breakdown of the Closing Balance OSA/BSPCE RSU BSA Number outstanding 3,871,841 4,459,695 155,594 Weighted-average exercise price € 27.28 NA € 23.07 Number vested 2,076,322 19,747 106,060 Weighted-average exercise price € 20.63 NA € 15.32 Weighted-average remaining contractual life of options outstanding, in years 7.30 NA 7.14 Reconciliation with the Consolidated Statements of Income Three Months Ended June 30, 2016 June 30, 2017 (in thousands) R&D S&O G&A Total R&D S&O G&A Total RSUs $ (1,459 ) $ (1,816 ) $ (1,184 ) $ (4,459 ) $ (4,040 ) $ (6,875 ) $ (2,667 ) $ (13,582 ) Share options / BSPCE (720 ) (672 ) (1,382 ) (2,774 ) (419 ) 469 (1,172 ) (1,122 ) Total share-based compensation (2,179 ) (2,488 ) (2,566 ) (7,233 ) (4,459 ) (6,406 ) (3,839 ) (14,704 ) BSAs — — (462 ) (462 ) — — (214 ) (214 ) Total equity awards compensation expense $ (2,179 ) $ (2,488 ) $ (3,028 ) $ (7,695 ) $ (4,459 ) $ (6,406 ) $ (4,053 ) $ (14,918 ) Six Months Ended June 30, 2016 June 30, 2017 (in thousands) R&D S&O G&A Total R&D S&O G&A Total RSUs $ (2,715 ) $ (3,484 ) $ (2,284 ) $ (8,483 ) $ (7,512 ) $ (13,135 ) $ (5,395 ) $ (26,042 ) Share options / BSPCE (1,866 ) (2,394 ) (2,771 ) (7,031 ) (863 ) 19 (2,401 ) (3,245 ) Total share-based compensation (4,581 ) (5,878 ) (5,055 ) (15,514 ) (8,375 ) (13,116 ) (7,796 ) (29,287 ) BSA — — (551 ) (551 ) — — (571 ) (571 ) Total equity awards compensation expense $ (4,581 ) $ (5,878 ) $ (5,606 ) $ (16,065 ) $ (8,375 ) $ (13,116 ) $ (8,367 ) $ (29,858 )

Financial Income and Expenses

Financial Income and Expenses	6 Months Ended
	Jun. 30, 2017
Other Income and Expenses [Abstract]
Financial Income and Expenses	Financial Income and Expenses The condensed consolidated statements of income line item “Financial income (expense)” can be broken down as follows: Three Months Ended June 30, June 30, (in thousands) Financial income from cash equivalents $ 482 $ 202 Interest and fees (612 ) (656 ) Interest on debt (513 ) (650 ) Fees (99 ) (6 ) Foreign exchange gain (loss) 41 (1,625 ) Other financial expense (5 ) (15 ) Total financial income (expense) $ (94 ) $ (2,094 ) The $2.1 million financial expense for the three months ended June 30, 2017 was driven by the hedging cost related to an intra-group position between Criteo S.A. and its U.S. subsidiary in the context of the funding of the HookLogic acquisition in November 2016 and the non-utilization fees incurred as part of our available RCF financing. The $0.1 million financial expense for the three months ended June 30, 2016 was mainly the result of a neutral impact of foreign exchange reevaluations and related hedging together with the recognition of the fees related to the revolving credit facility entered into in September 2015 (as amended in March 2017). Six Months Ended June 30, June 30, (in thousands) Financial income from cash equivalents $ 870 $ 449 Interest and fees (1,088 ) (1,412 ) Interest on debt (783 ) (1,218 ) Fees (305 ) (194 ) Foreign exchange gain (loss) (1,175 ) (3,433 ) Other financial expense (19 ) (31 ) Total financial income (expense) $ (1,412 ) $ (4,427 ) The $4.4 million financial expense for the six months ended June 30, 2017 was driven by the interest accrued as a result of the $75 million drawn on the revolving credit facility entered into in September 2015 (as amended in March 2017) and the hedging cost related to an intra-group position between Criteo S.A. and its U.S. subsidiary, both in the context of the funding of the HookLogic acquisition in November 2016, as well as the non-utilization fees incurred as part of our available RCF financing. The $1.4 million financial expense for the six months ended June 30, 2016 was mainly a result of the recognition of the negative impact of foreign exchange reevaluations and related hedging recorded during the first quarter, together with the fees related to the revolving credit facility entered into in September 2015 (as amended in March 2017).

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Breakdown of Income Taxes Our tax provision for interim periods is determined using an estimate of our annual effective tax rate (“AETR”), adjusted for discrete items arising in that quarter. To calculate our estimated AETR, we estimate our income before taxes and the related tax expense or benefit for the full fiscal year (total of expected current and deferred tax provisions), excluding the effect of significant unusual or infrequently occurring items or comprehensive income items not recognized in the statement of income. Each quarter, we update our estimate of the annual effective tax rate, and if our estimated annual tax rate changes, we make a cumulative adjustment in that quarter. Our quarterly tax provision, and our quarterly estimate of our annual effective tax rate, are subject to significant volatility due to several factors including our ability to accurately predict our income (loss) before provision for income taxes in multiple jurisdictions and the changes in foreign exchange rates. Our effective tax rate in the future will depend on the portion of our profits earned within and outside of France. The condensed consolidated statements of income line item “Provision for income taxes” can be broken down as follows: Six Months Ended June 30, June 30, (in thousands) Current income tax $ (16,818 ) $ (20,271 ) France (8,172 ) (7,289 ) International (8,646 ) (12,982 ) Net change in deferred taxes 4,424 12,405 France 4,216 (944 ) International 208 13,349 Provision for income taxes $ (12,394 ) $ (7,866 ) For the six months ended June 30, 2016 and 2017, we utilized an annual estimated tax rate of 28% and 30% respectively to calculate the provision for income taxes. The effective tax rate was 28% and 26% for the six months ended June 30, 2016 and 2017, respectively. The difference between the annual estimated tax rate and the effective tax rate for six months ended June 30, 2017 is due to the tax impact of discrete items such as share-based compensation in the United States. Current tax assets and liabilities The total amount of current tax assets consists mainly of prepayments of income taxes by Criteo S.A., Criteo Corp. and Criteo Brazil. The current tax liabilities refers mainly to the net corporate tax payables of Criteo Italy, Criteo K.K. and Criteo Deutschland.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic Earnings Per Share We calculate basic earnings per share by dividing the net income for the period attributable to shareholders of the Parent by the weighted average number of shares outstanding. Three Months Ended Six Months Ended June 30, 2016 June 30, 2017 June 30, 2016 June 30, 2017 (in thousands, except share and per share data) Net income attributable to shareholders of Criteo S.A. $ 12,200 $ 5,970 $ 29,330 $ 18,411 Weighted average number of shares outstanding 63,246,785 65,027,985 62,928,221 64,611,237 Basic earnings per share $ 0.19 $ 0.09 $ 0.47 $ 0.28 Diluted Earnings Per Share We calculate diluted earnings per share by dividing the net income attributable to shareholders of the Parent by the weighted average number of shares outstanding plus any potentially dilutive shares not yet issued from share-based compensation plans (see Note 10). There were no other potentially dilutive instruments outstanding as of June 30, 2016 and 2017 . Consequently, all potential dilutive effects from shares are considered. For each period presented, a contract to issue a certain number of shares (i.e. share option, non-employee warrant ("BSA"), restricted share unit ("RSU") or non-employee warrant ("BSPCE") is assessed as potentially dilutive if it is “in the money” (i.e., the exercise or settlement price is lower than the average market price). Three Months Ended Six Months Ended June 30, 2016 June 30, 2017 June 30, 2016 June 30, 2017 (in thousands, except share and per share data) Net income attributable to shareholders of Criteo S.A. $ 12,200 $ 5,970 $ 29,330 $ 18,411 Weighted average number of shares outstanding of Criteo S.A. 63,246,785 65,027,985 62,928,221 64,611,237 Dilutive effect of : Restricted share awards ("RSUs") 189,980 1,598,093 94,990 1,438,010 Share options and BSPCE 2,104,298 1,427,448 2,124,592 1,574,728 Share warrants 84,034 77,748 85,135 85,814 Weighted average number of shares outstanding used to determine diluted earnings per share 65,625,097 68,131,274 65,232,938 67,709,789 Diluted earnings per share $ 0.19 $ 0.09 $ 0.45 $ 0.27 The weighted average number of securities that were anti-dilutive for diluted EPS for the periods presented but which could potentially dilute EPS in the future are as follows: Three Months Ended Six Months Ended June 30, 2016 June 30, 2017 June 30, 2016 June 30, 2017 Restricted share awards 134,112 11,834 502,511 120,782 Share options and BSPCE 824,858 129,005 412,429 285,958 Share warrants — — — — Weighted average number of anti-dilutive securities excluded from diluted earnings per share 958,970 140,839 914,940 406,740

Commitments and contingencies

Commitments and contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	Commitments and contingencies Commitments Leases We are party to various contractual commitments mainly related to our offices as well as hosting services. There have been no significant changes in future payment obligations for these contractual commitments from what was disclosed in Note 23 to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016. Certain of these arrangements have free rent periods or escalating rent payment provisions, and we recognize rent expense under such arrangements on a straight-line basis. Rent expenses relating to our offices totaled $7.6 million and $8.6 million for the three-month period ended June 30, 2016 and 2017, respectively and $15.0 million and $17.4 million for the six-month period ended June 30, 2016 and 2017, respectively. Hosting costs totaled $10.5 million and $17.1 million for the three-month period ended June 30, 2016 and 2017, respectively and $19.8 million and $31.0 million for the six-month period ended June 30, 2016 and 2017, respectively. Revolving Credit Facilities, Credit Line Facilities and Bank Overdrafts As mentioned in Note 9, we are party to two RCFs including one with HSBC for which we can draw up to RMB 50.0 million ( $7.4 million ) and one with a syndicate of banks which allow us to draw up to €350.0 million ( $399.4 million ), further to the amendment signed in March 2017 increasing the facility amount from €250.0 million to €350.0 million and extending the term of the contract from 2020 to 2022. As of June 30, 2017, RMB 30.0 million ( $4.4 million ), and €0.0 million ( $0.0 million ), respectively, were drawn on the RCFs. Both of these credit facilities are unsecured and contain customary events of default but do not contain any affirmative, financial or negative covenants, with the exception of the €350.0 million ( $399.4 million ) RCF which contains covenants, including compliance with a total net debt to adjusted EBITDA ratio and restrictions on incurring additional indebtedness. As of June 30, 2017, we were in compliance with the required leverage ratio. Contingencies Changes in provisions during the presented periods are summarized below: Provision for employee-related litigation Other provisions Total (in thousands) Balance at January 1, 2017 $ 485 $ 169 $ 654 Charges 6 954 960 Provision used — (24 ) (24 ) Provision released not used (250 ) — (250 ) Currency translation adjustments 26 26 52 Balance at June 30, 2017 $ 267 $ 1,125 $ 1,392 - of which current 267 1,125 1,392 The amount of the provisions represent management’s best estimate of the future outflow. As of June 30, 2017, provisions are mainly in relation to employee-related litigations and business and operating risks.

Breakdown of Revenue and Non-Cu

Breakdown of Revenue and Non-Current Assets by Geographical Areas	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Breakdown of Revenue and Non-Current Assets by Geographical Areas	Breakdown of Revenue and Non-Current Assets by Geographical Areas The Company operates in the following three geographical markets: • Americas (North and South America); • EMEA (Europe, Middle-East and Africa); and • Asia-Pacific. The following tables disclose our consolidated revenue for each geographical area for each of the reported periods. Revenue by geographical area is based on the location of advertisers’ campaigns. Americas EMEA Asia-Pacific Total For the three months ended: (in thousands) June 30, 2016 $ 156,522 $ 153,899 $ 96,780 $ 407,201 June 30, 2017 $ 229,392 $ 191,682 $ 120,948 $ 542,022 Revenue generated in France amounted to $30.9 million and $36.1 million for the three months ended June 30, 2016 and 2017, respectively. Americas EMEA Asia-Pacific Total For the six months ended: (in thousands) June 30, 2016 $ 303,695 $ 313,305 $ 191,454 $ 808,454 June 30, 2017 $ 437,405 $ 380,774 $ 240,509 $ 1,058,688 Revenue generated in France amounted to $63.4 million and $73.6 million for the six months ended June 30, 2016 and 2017, respectively. Revenue generated in other significant countries where we operate is presented in the following table: Three Months Ended Six Months Ended June 30, 2016 June 30, 2017 June 30, 2016 June 30, 2017 (in thousands) Americas United States $ 134,351 $ 200,801 $ 261,264 $ 380,464 EMEA Germany $ 30,891 $ 41,882 $ 64,586 $ 84,496 United Kingdom $ 27,230 $ 26,422 $ 55,739 $ 54,619 Asia-Pacific Japan $ 66,590 $ 87,400 $ 132,564 $ 172,710 As of June 30, 2016 and 2017, our largest client represented 2.3% and 2.1% , respectively, of our consolidated revenue. Other Information For each reported period, non-current assets (corresponding to the net book value of tangible and intangible assets) are presented in the table below. The geographical information results from the locations of legal entities. Of which Of which Holding Americas United States EMEA Asia-Pacific Japan Total (in thousands) December 31, 2016 $ 55,052 $ 123,308 $ 122,474 $ 7,132 $ 26,033 $ 8,965 $ 211,525 June 30, 2017 $ 70,805 $ 135,241 $ 134,701 $ 7,991 $ 21,354 $ 7,772 $ 235,391

Related Parties

Related Parties	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Parties	Related Parties There were no significant related-party transactions during the period nor any change in the nature of the transactions as described in Note 24 to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2016.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company evaluated all other subsequent events that occurred after June 30, 2017 through the date of issuance of the unaudited condensed consolidated financial statements and determined there are no significant events that require adjustments or disclosure.

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed consolidated financial statements included herein have been prepared by Criteo S.A. pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in the Company's Annual Report filed on Form 10-K for the year ended December 31, 2016 , filed with the SEC on March 1, 2017. The unaudited condensed consolidated financial statements included herein reflect all adjustments (consisting of normal, recurring adjustments) which are, in the opinion of management, necessary to state fairly the results for the interim periods presented. The results of operations for the interim periods presented are not necessarily indicative of the operating results to be expected for any subsequent interim period or for the fiscal year.
Use of Estimates	Conformity with U.S. GAAP requires the use of estimates and judgments that affect the reported amounts of assets, liabilities, revenue and expenses in the condensed consolidated financial statements and accompanying notes. We base our estimates and judgments on historical information and on various other assumptions that we believe are reasonable under the circumstances. Our actual results may differ from these estimates. U.S. GAAP requires us to make estimates and judgments in several areas, including, but not limited to: (1) the recognition of revenue and particularly the determination as to whether revenue should be reported on a gross or a net basis; (2) the evaluation of our trade receivables and the recognition of a valuation allowance for doubtful accounts; (3) the recognition and measurement of goodwill and intangible assets and particularly costs capitalized in relation to our customized internal-use software; (4) the measurement of share-based compensation and (5) the tax provision determination and particularly the estimate of our annual effective tax rate based on applicable tax rates.
Recently Issued Accounting Standards	Accounting Pronouncements adopted in 2017 From January 1, 2017, we adopted ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvement to Employee Share-based Payment Accounting issued by the Financial Accounting Standards Board (FASB), which among other items, simplifies certain aspects of the accounting for share-based payment transactions to employees. The new standard particularly requires excess tax benefits and tax deficiencies to be recorded in the statements of income as a component of the provision for income taxes when stock awards vest or are settled. The effective date is January 1, 2017. Upon adoption, a cumulative effect of $10.0 million of this change has been recognized through retained earnings. The adoption of the standard also resulted in a current year tax expense of $1.4 million which previously would have been recognized in the current period in additional paid-in capital. Accounting Pronouncements not yet adopted In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805) ("ASU 2017-01") the purpose of which is to change the definition of a business to assist entities in evaluating when a set of transferred assets and activities is a business. This update will be effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The adoption of ASU 2017-01 is not expected to have a material impact on our financial position or results of operations. In January 2017, the FASB issued ASU 2017-04 Goodwill and Other (Topic 350) . ASU 2017-04 simplifies the subsequent measurement of goodwill and reduces the cost and complexity of evaluating goodwill for impairment. It eliminates the need for entities to calculate the implied fair value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination. Under this amendment, an entity will perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge is recognized for the amount by which the carrying value exceeds the reporting unit's fair value. This update will be effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. The adoption of ASU 2017-04 is not expected to have a material impact on our financial position or results of operations. In March 2017, FASB issued ASU 2017-07 Compensation-Retirements Benefits (Topic 715). ASU 2017-07 requires that an employer disaggregate the service cost component from the other components of net benefit cost. The amendments also provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. The amendments in ASU 2017-07 improve the consistency, transparency, and usefulness of financial information to users that have communicated that the service cost component generally is analyzed differently from the other components of net benefit cost. This update will be effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. The amendments in ASU 2017-07 should be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic post-retirement benefit cost in the income statement and prospectively, on and after the effective date, for the capitalization of the service cost component of net periodic pension cost and net periodic post-retirement benefit in assets. We intend to adopt the standard on the effective date of January 1, 2018. The adoption of ASU 2017-07 is not expected to have a material impact on our financial position or results of operations. In May 2017, the FASB issued ASU 2017-09 Compensation - Stock Compensation (Topic 718) . ASU 2017-09 was issued to provide clarity and reduce diversity in practice and complexity when applying the guidance in Topic 718 to a change in terms or conditions of a share based payment award. The amendments are effective for annual periods and interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted and should be applied prospectively to an award modified on or after the adoption date. To date, Criteo has not yet had any modifications of its share-based awards. We intend to adopt the standard on the effective date of January 1, 2018. The adoption of ASU 2017-09 is not expected to have a material impact on our financial position or results of operations.

Significant Events and Transa25

Significant Events and Transactions of the Period (Tables)	6 Months Ended
	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs	The following table summarizes restructuring activities as of June 30, 2017 included in other current liabilities on the balance sheet: Six Months Ended June 30, 2017 (in thousands) Restructuring liability - April 1, 2017 $ — Restructuring charges 3,299 Amounts Paid (426 ) Restructuring liability - June 30, 2017 $ 2,873 As such, we have recorded $3.3 million in restructuring charges for the three months ended and the six months ended June 30, 2017, as follows: Three Months and Six Months Ended June 30, 2017 (in thousands) Severance costs $ 802 Facility Exit Costs 2,265 Other 232 Total restructuring costs $ 3,299

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Schedules of concentration of risk	For each period presented, the aging of trade receivables and allowances for potential losses is as follows: December 31, 2016 June 30, 2017 Gross value % Allowance % Gross value % Allowance % (in thousands) (in thousands) (in thousands) (in thousands) Not yet due $ 265,600 65.0 % $ — — % $ 309,417 80.5 % $ — — % 0 - 30 days 92,163 22.5 % (49 ) 0.4 % 12,107 3.1 % (23 ) 0.2 % 31 - 60 days 19,747 4.8 % (182 ) 1.6 % 20,140 5.2 % (27 ) 0.2 % 61 - 90 days 6,055 1.5 % (191 ) 1.6 % 12,640 3.3 % (200 ) 1.4 % > 90 days 25,277 6.2 % (11,176 ) 96.4 % 30,466 7.9 % (14,468 ) 98.2 % Total $ 408,842 100.0 % $ (11,598 ) 100.0 % $ 384,770 100.0 % $ (14,718 ) 100.0 % The maximum exposure to credit risk at the end of each reported period is represented by the carrying amount of financial assets, and summarized in the following table: December 31, 2016 June 30, 2017 Cash and cash equivalents $ 270,317 $ 308,185 Trade receivables, net of allowance 397,244 370,052 Other taxes 52,942 46,514 Other current assets 19,340 28,270 Non-current financial assets 17,029 18,824 Total $ 756,872 $ 771,845
Schedule of financial liabilities	Financial Liabilities December 31, 2016 Carrying Value Fair value (in thousands) Trade payables $ 365,788 $ 365,788 Other taxes 44,831 44,831 Employee-related payables 55,874 55,874 Other current liabilities 30,221 30,221 Financial liabilities 85,580 85,580 Total $ 582,294 $ 582,294 June 30, 2017 Carrying Value Fair value (in thousands) Trade payables $ 351,408 $ 351,408 Other taxes 45,606 45,606 Employee-related payables 64,467 64,467 Other current liabilities 37,906 37,906 Financial liabilities 8,472 8,472 Total $ 507,859 $ 507,859
Schedule of derivative financial instruments	December 31, 2016 Carrying Value Fair value (in thousands) Derivative Assets: Included in other current assets $ — $ — Derivative Liabilities: Included in financial liabilities - current portion $ 1,968 $ 1,968 June 30, 2017 Carrying Value Fair value (in thousands) Derivative Assets: Included in other current assets $ 4,600 $ 4,600 Derivative Liabilities: Included in financial liabilities - current portion $ — $ —
Schedule of assets and liabilities carried at fair value	December 31, 2016 Carrying Value Fair value (in thousands) Cash $ 31,688 $ 31,688 Money market funds 88,091 88,091 Interest-bearing bank deposits 150,538 150,538 Total cash and cash equivalents $ 270,317 $ 270,317 June 30, 2017 Carrying Value Fair value (in thousands) Cash $ 197,994 $ 197,994 Money market funds — — Interest-bearing bank deposits 110,191 110,191 Total cash and cash equivalents $ 308,185 $ 308,185

Trade Receivables (Tables)

Trade Receivables (Tables)	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Schedules of trade receivables net book value and Changes in allowance for doubtful accounts	The following table shows the breakdown in trade receivables net book value for the presented periods: December 31, 2016 June 30, 2017 (in thousands) Trade accounts receivables $ 408,842 $ 384,770 (Less) Allowance for doubtful accounts (11,598 ) (14,718 ) Net book value at end of period $ 397,244 $ 370,052 Changes in allowance for doubtful accounts are summarized below: 2016 2017 (in thousands) Balance at January 1 $ (6,264 ) $ (11,598 ) Allowance for doubtful accounts (4,652 ) (5,347 ) Reversal of provision 806 2,630 Currency translation adjustment (28 ) (403 ) Balance at June 30 $ (10,138 ) $ (14,718 )

Other Current Assets (Tables)

Other Current Assets (Tables)	6 Months Ended
	Jun. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of other current assets net book value	The following table shows the breakdown in other current assets net book value for the presented periods: December 31, 2016 June 30, 2017 (in thousands) Prepayments to suppliers $ 2,439 $ 3,970 Other debtors 3,263 6,930 Prepaid expenses 13,638 17,370 Gross book value at end of period 19,340 28,270 Net book value at end of period $ 19,340 $ 28,270

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of finite-lived intangible assets	The amounts shown below may change in the near term as management continues to assess the fair value of acquired assets and liabilities within the twelve-month purchase price allocation period. December 31, 2016 June 30, 2017 Useful Lives (Years) Amounts recognized as of Acquisition Date (in millions) Useful Lives (Years) Amounts recognized as of Acquisition Date (in millions) Technology 3-5 years $ 34.1 3-5 years $ 29.8 Customer relationships 5-9 years 65.5 5-9 years 84.3 Total identifiable intangible assets acquired $ 99.6 $ 114.1
Schedule of estimated future amortization expense related to intangible assets	The estimated amortization expense related to intangible assets for the next five years and thereafter is as follows: Software Technology and customer relationships Total From July 1 to December 31, 2017 $ 3,309 $ 7,918 $ 11,227 2018 5,672 15,678 21,350 2019 3,310 13,972 17,282 2020 1,245 8,628 9,873 2021 395 8,628 9,023 Thereafter — 35,290 35,290 Total $ 13,931 $ 90,114 $ 104,045

Goodwill (Tables)

Goodwill (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill (in thousands) Balance at January 1, 2017 $ 209,418 Additions to goodwill 23,738 Currency translation adjustment 2,181 Balance at June 30, 2017 $ 235,337

Other Current Liabilities (Tabl

Other Current Liabilities (Tables)	6 Months Ended
	Jun. 30, 2017
Other Liabilities Disclosure [Abstract]
Other current liabilities	Other current liabilities are presented in the following table: December 31, 2016 June 30, (in thousands) Clients' prepayments $ 9,176 $ 15,246 Accounts payable relating to capital expenditures 15,484 14,153 Other creditors 2,440 8,066 Deferred revenue 3,121 441 Total $ 30,221 $ 37,906

Financial Liabilities (Tables)

Financial Liabilities (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Schedule of changes in current and non-current financial liabilities	The changes in current and non-current financial liabilities during the period ended June 30, 2017 are illustrated in the following schedules: As of January 1, 2017 New borrowings Repayments Change in scope Other (1) Currency translation adjustment As of June 30, 2017 (in thousands) Borrowings $ 5,524 $ 1,593 $ (79,360 ) $ — $ 77,436 $ 183 $ 5,376 Other financial liabilities 477 135 (241 ) — 70 34 475 Derivative instruments 1,968 — — — (2,020 ) 52 — Current portion 7,969 1,728 (79,601 ) — 75,486 269 5,851 Borrowings 77,397 — — — (77,436 ) 2,142 2,103 Other financial liabilities 214 360 — — (70 ) 14 518 Non current portion 77,611 360 — — (77,506 ) 2,156 2,621 Borrowings 82,921 1,593 (79,360 ) — — 2,325 7,479 Other financial liabilities 691 495 (241 ) — — 48 993 Derivative instruments 1,968 — — — (2,020 ) 52 — Total $ 85,580 $ 2,088 $ (79,601 ) $ — $ (2,020 ) $ 2,425 $ 8,472 (1) Includes reclassification from non-current to current portion based on maturity of the financial liabilities.

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of share-based compensation by share-based payment award	Change in Number of BSPCE/OSA/RSU/BSA OSA/BSPCE RSU BSA Total Balance at January 1, 2017 4,960,092 3,243,279 188,125 8,391,496 Granted 355,010 1,402,932 10,825 1,768,767 Exercised (1,270,417 ) — (43,356 ) (1,313,773 ) Forfeited (172,844 ) (186,516 ) — (359,360 ) Expired — — — — Balance at June 30, 2017 3,871,841 4,459,695 155,594 8,487,130 Breakdown of the Closing Balance OSA/BSPCE RSU BSA Number outstanding 3,871,841 4,459,695 155,594 Weighted-average exercise price € 27.28 NA € 23.07 Number vested 2,076,322 19,747 106,060 Weighted-average exercise price € 20.63 NA € 15.32 Weighted-average remaining contractual life of options outstanding, in years 7.30 NA 7.14
Schedule of share-based compensation reconciliation with the Consolidated Statements of Income	Reconciliation with the Consolidated Statements of Income Three Months Ended June 30, 2016 June 30, 2017 (in thousands) R&D S&O G&A Total R&D S&O G&A Total RSUs $ (1,459 ) $ (1,816 ) $ (1,184 ) $ (4,459 ) $ (4,040 ) $ (6,875 ) $ (2,667 ) $ (13,582 ) Share options / BSPCE (720 ) (672 ) (1,382 ) (2,774 ) (419 ) 469 (1,172 ) (1,122 ) Total share-based compensation (2,179 ) (2,488 ) (2,566 ) (7,233 ) (4,459 ) (6,406 ) (3,839 ) (14,704 ) BSAs — — (462 ) (462 ) — — (214 ) (214 ) Total equity awards compensation expense $ (2,179 ) $ (2,488 ) $ (3,028 ) $ (7,695 ) $ (4,459 ) $ (6,406 ) $ (4,053 ) $ (14,918 ) Six Months Ended June 30, 2016 June 30, 2017 (in thousands) R&D S&O G&A Total R&D S&O G&A Total RSUs $ (2,715 ) $ (3,484 ) $ (2,284 ) $ (8,483 ) $ (7,512 ) $ (13,135 ) $ (5,395 ) $ (26,042 ) Share options / BSPCE (1,866 ) (2,394 ) (2,771 ) (7,031 ) (863 ) 19 (2,401 ) (3,245 ) Total share-based compensation (4,581 ) (5,878 ) (5,055 ) (15,514 ) (8,375 ) (13,116 ) (7,796 ) (29,287 ) BSA — — (551 ) (551 ) — — (571 ) (571 ) Total equity awards compensation expense $ (4,581 ) $ (5,878 ) $ (5,606 ) $ (16,065 ) $ (8,375 ) $ (13,116 ) $ (8,367 ) $ (29,858 )

Financial Income and Expenses (

Financial Income and Expenses (Tables)	6 Months Ended
	Jun. 30, 2017
Other Income and Expenses [Abstract]
Schedule of Financial income (expense)	The condensed consolidated statements of income line item “Financial income (expense)” can be broken down as follows: Three Months Ended June 30, June 30, (in thousands) Financial income from cash equivalents $ 482 $ 202 Interest and fees (612 ) (656 ) Interest on debt (513 ) (650 ) Fees (99 ) (6 ) Foreign exchange gain (loss) 41 (1,625 ) Other financial expense (5 ) (15 ) Total financial income (expense) $ (94 ) $ (2,094 ) Six Months Ended June 30, June 30, (in thousands) Financial income from cash equivalents $ 870 $ 449 Interest and fees (1,088 ) (1,412 ) Interest on debt (783 ) (1,218 ) Fees (305 ) (194 ) Foreign exchange gain (loss) (1,175 ) (3,433 ) Other financial expense (19 ) (31 ) Total financial income (expense) $ (1,412 ) $ (4,427 )

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Schedule of Provision for income taxes	The condensed consolidated statements of income line item “Provision for income taxes” can be broken down as follows: Six Months Ended June 30, June 30, (in thousands) Current income tax $ (16,818 ) $ (20,271 ) France (8,172 ) (7,289 ) International (8,646 ) (12,982 ) Net change in deferred taxes 4,424 12,405 France 4,216 (944 ) International 208 13,349 Provision for income taxes $ (12,394 ) $ (7,866 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Schedule of basic earnings per share	Three Months Ended Six Months Ended June 30, 2016 June 30, 2017 June 30, 2016 June 30, 2017 (in thousands, except share and per share data) Net income attributable to shareholders of Criteo S.A. $ 12,200 $ 5,970 $ 29,330 $ 18,411 Weighted average number of shares outstanding 63,246,785 65,027,985 62,928,221 64,611,237 Basic earnings per share $ 0.19 $ 0.09 $ 0.47 $ 0.28
Schedule of diluted earnings per share	Three Months Ended Six Months Ended June 30, 2016 June 30, 2017 June 30, 2016 June 30, 2017 (in thousands, except share and per share data) Net income attributable to shareholders of Criteo S.A. $ 12,200 $ 5,970 $ 29,330 $ 18,411 Weighted average number of shares outstanding of Criteo S.A. 63,246,785 65,027,985 62,928,221 64,611,237 Dilutive effect of : Restricted share awards ("RSUs") 189,980 1,598,093 94,990 1,438,010 Share options and BSPCE 2,104,298 1,427,448 2,124,592 1,574,728 Share warrants 84,034 77,748 85,135 85,814 Weighted average number of shares outstanding used to determine diluted earnings per share 65,625,097 68,131,274 65,232,938 67,709,789 Diluted earnings per share $ 0.19 $ 0.09 $ 0.45 $ 0.27
Schedule of weighted average number of anti-dilutive securities	The weighted average number of securities that were anti-dilutive for diluted EPS for the periods presented but which could potentially dilute EPS in the future are as follows: Three Months Ended Six Months Ended June 30, 2016 June 30, 2017 June 30, 2016 June 30, 2017 Restricted share awards 134,112 11,834 502,511 120,782 Share options and BSPCE 824,858 129,005 412,429 285,958 Share warrants — — — — Weighted average number of anti-dilutive securities excluded from diluted earnings per share 958,970 140,839 914,940 406,740

Commitments and contingencies (

Commitments and contingencies (Tables)	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Changes in provisions for contingencies	Changes in provisions during the presented periods are summarized below: Provision for employee-related litigation Other provisions Total (in thousands) Balance at January 1, 2017 $ 485 $ 169 $ 654 Charges 6 954 960 Provision used — (24 ) (24 ) Provision released not used (250 ) — (250 ) Currency translation adjustments 26 26 52 Balance at June 30, 2017 $ 267 $ 1,125 $ 1,392 - of which current 267 1,125 1,392

Breakdown of Revenue and Non-38

Breakdown of Revenue and Non-Current Assets by Geographical Areas (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Schedule of consolidated revenue for each geographical area	Americas EMEA Asia-Pacific Total For the six months ended: (in thousands) June 30, 2016 $ 303,695 $ 313,305 $ 191,454 $ 808,454 June 30, 2017 $ 437,405 $ 380,774 $ 240,509 $ 1,058,688 The following tables disclose our consolidated revenue for each geographical area for each of the reported periods. Revenue by geographical area is based on the location of advertisers’ campaigns. Americas EMEA Asia-Pacific Total For the three months ended: (in thousands) June 30, 2016 $ 156,522 $ 153,899 $ 96,780 $ 407,201 June 30, 2017 $ 229,392 $ 191,682 $ 120,948 $ 542,022
Schedule of revenue generated in other significant countries	Revenue generated in other significant countries where we operate is presented in the following table: Three Months Ended Six Months Ended June 30, 2016 June 30, 2017 June 30, 2016 June 30, 2017 (in thousands) Americas United States $ 134,351 $ 200,801 $ 261,264 $ 380,464 EMEA Germany $ 30,891 $ 41,882 $ 64,586 $ 84,496 United Kingdom $ 27,230 $ 26,422 $ 55,739 $ 54,619 Asia-Pacific Japan $ 66,590 $ 87,400 $ 132,564 $ 172,710
Schedule of non-current assets by geographical area and country	For each reported period, non-current assets (corresponding to the net book value of tangible and intangible assets) are presented in the table below. The geographical information results from the locations of legal entities. Of which Of which Holding Americas United States EMEA Asia-Pacific Japan Total (in thousands) December 31, 2016 $ 55,052 $ 123,308 $ 122,474 $ 7,132 $ 26,033 $ 8,965 $ 211,525 June 30, 2017 $ 70,805 $ 135,241 $ 134,701 $ 7,991 $ 21,354 $ 7,772 $ 235,391

Summary of Significant Accoun39

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense	$ 3,665	$ 4,450	$ 7,866	$ 12,394
Additional Paid-in Capital | Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption					$ 10,000
Income tax expense			$ 1,400

Significant Events and Transa40

Significant Events and Transactions of the Period - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Restructuring charges	$ 3,299,000	$ 3,299,000
RCF | Multicurrency revolving facility agreement | Revolving credit facility
Business Acquisition [Line Items]
Long-term line of credit	0	0	$ 75,000,000
Other Cost of Operating Revenue
Business Acquisition [Line Items]
Restructuring charges	2,500,000	2,500,000
Selling and Marketing Expense
Business Acquisition [Line Items]
Restructuring charges	700,000	700,000
General and Administrative Expense
Business Acquisition [Line Items]
Restructuring charges	$ 100,000	$ 100,000

Significant Events and Transa41

Significant Events and Transactions of the Period - Schedule of Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Severance costs	$ 802	$ 802
Facility Exit Costs	2,265	2,265
Other	232	232
Total restructuring costs	$ 3,299	$ 3,299

Significant Events and Transa42

Significant Events and Transactions of the Period - Schedule of Restructuring Liability (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Restructuring Reserve [Roll Forward]
Restructuring liability - April 1, 2017		$ 0
Restructuring charges	$ 3,299	3,299
Amounts Paid		(426)
Restructuring liability - June 30, 2017	$ 2,873	$ 2,873

Financial Instruments - Credit

Financial Instruments - Credit Risks (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Allowance for doubtful accounts receivable, period increase (decrease)	$ 3,100	$ 5,400
Credit Concentration Risk
Concentration Risk [Line Items]
Maximum exposure	771,845	756,872
Carrying Value | Cash and cash equivalents
Concentration Risk [Line Items]
Maximum exposure	308,185	270,317
Carrying Value | Trade receivables, net of allowances
Concentration Risk [Line Items]
Maximum exposure	370,052	397,244
Carrying Value | Other taxes
Concentration Risk [Line Items]
Maximum exposure	46,514	52,942
Carrying Value | Other current assets
Concentration Risk [Line Items]
Maximum exposure	28,270	19,340
Carrying Value | Financial assets
Concentration Risk [Line Items]
Maximum exposure	$ 18,824	$ 17,029

Financial Instruments - Trade R

Financial Instruments - Trade Receivables (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Gross value	$ 384,770		$ 408,842
Concentration risk, percentage		2.30%
Allowance	(14,718)		(11,598)
Not yet due
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Gross value	309,417		265,600
Allowance	0		0
0 - 30 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Gross value	12,107		92,163
Allowance	(23)		(49)
31 - 60 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Gross value	20,140		19,747
Allowance	(27)		(182)
61 - 90 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Gross value	12,640		6,055
Allowance	(200)		(191)
Greater than 90 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Gross value	30,466		25,277
Allowance	$ (14,468)		$ (11,176)
Accounts Receivable
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	100.00%		100.00%
Accounts Receivable | Not yet due
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	80.50%		65.00%
Accounts Receivable | 0 - 30 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	3.10%		22.50%
Accounts Receivable | 31 - 60 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	5.20%		4.80%
Accounts Receivable | 61 - 90 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	3.30%		1.50%
Accounts Receivable | Greater than 90 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	7.90%		6.20%
Allowance for Doubtful Accounts
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	100.00%		100.00%
Allowance for Doubtful Accounts | Not yet due
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	0.00%		0.00%
Allowance for Doubtful Accounts | 0 - 30 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	0.20%		0.40%
Allowance for Doubtful Accounts | 31 - 60 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	0.20%		1.60%
Allowance for Doubtful Accounts | 61 - 90 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	1.40%		1.60%
Allowance for Doubtful Accounts | Greater than 90 days
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	98.20%		96.40%

Financial Instruments - Financi

Financial Instruments - Financial Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trade payables	$ 351,408	$ 365,788
Other taxes	45,606	44,831
Employee-related payables	64,467	55,874
Other current liabilities	37,906	30,221
Financial liabilities	8,472	85,580
Total	507,859	582,294
Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trade payables	351,408	365,788
Other taxes	45,606	44,831
Employee-related payables	64,467	55,874
Other current liabilities	37,906	30,221
Financial liabilities	8,472	85,580
Total	$ 507,859	$ 582,294

Financial Instruments - Derivat

Financial Instruments - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Derivative Liabilities:
Included in financial liabilities - current portion	$ 0	$ 1,968
Fair Value, Inputs, Level 2 | Carrying Value
Derivative Assets:
Included in other current assets	4,600		$ 0
Derivative Liabilities:
Included in financial liabilities - current portion	0		1,968
Fair Value, Inputs, Level 2 | Fair value
Derivative Assets:
Included in other current assets	4,600		0
Derivative Liabilities:
Included in financial liabilities - current portion	$ 0		$ 1,968

Financial Instruments - Cash an

Financial Instruments - Cash and Cash Equivalents (Details) - Fair Value, Inputs, Level 2 - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 308,185	$ 270,317
Carrying Value | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	197,994	31,688
Carrying Value | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	88,091
Carrying Value | Interest-bearing bank deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	110,191	150,538
Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	308,185	270,317
Fair value | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	197,994	31,688
Fair value | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	88,091
Fair value | Interest-bearing bank deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 110,191	$ 150,538

Trade Receivables - Breakdown i

Trade Receivables - Breakdown in Trade Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Receivables [Abstract]
Trade accounts receivables	$ 384,770	$ 408,842
(Less) Allowance for doubtful accounts	(14,718)	(11,598)	$ (10,138)	$ (6,264)
Net book value at end of period	$ 370,052	$ 397,244

Trade Receivables - Allowance f

Trade Receivables - Allowance for Doubtful Accounts Rollforward (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at January 1	$ (11,598)	$ (6,264)
Allowance for doubtful accounts	(5,347)	(4,652)
Reversal of provision	2,630	806
Currency translation adjustment	(403)	(28)
Balance at June 30	$ (14,718)	$ (10,138)

Other Current Assets (Details)

Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepayments to suppliers	$ 3,970	$ 2,439
Other debtors	6,930	3,263
Prepaid expenses	17,370	13,638
Gross book value at end of period	28,270	19,340
Net book value at end of period	$ 28,270	$ 19,340

Intangible Assets - Schedule of

Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amounts recognized as of acquisition date	$ 114.1	$ 99.6
Technology-Based Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Amounts recognized as of acquisition date	$ 29.8	$ 34.1
Technology-Based Intangible Assets | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	3 years	3 years
Technology-Based Intangible Assets | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	5 years	5 years
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Amounts recognized as of acquisition date	$ 84.3	$ 65.5
Customer Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	5 years	5 years
Customer Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	9 years	9 years

Intangible Assets - Estimated A

Intangible Assets - Estimated Amortization Expense (Details) $ in Thousands	Jun. 30, 2017USD ($)
Finite-Lived Intangible Assets [Line Items]
From July 1 to December 31, 2017	$ 11,227
2,018	21,350
2,019	17,282
2,020	9,873
2,021	9,023
Thereafter	35,290
Total	104,045
Software
Finite-Lived Intangible Assets [Line Items]
From July 1 to December 31, 2017	3,309
2,018	5,672
2,019	3,310
2,020	1,245
2,021	395
Thereafter	0
Total	13,931
Technology and customer relationships
Finite-Lived Intangible Assets [Line Items]
From July 1 to December 31, 2017	7,918
2,018	15,678
2,019	13,972
2,020	8,628
2,021	8,628
Thereafter	35,290
Total	$ 90,114

Goodwill (Details)

Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2017	$ 209,418
Additions to goodwill	23,738
Currency translation adjustment	2,181
Balance at June 30, 2017	$ 235,337

Other Current Liabilities (Deta

Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Clients' prepayments	$ 15,246	$ 9,176
Accounts payable relating to capital expenditures	14,153	15,484
Other creditors	8,066	2,440
Deferred revenue	441	3,121
Accounts Payable, Accrued Liabilities, Employee-related Payables, and Taxes Payable, Current	$ 37,906	$ 30,221

Financial Liabilities - Changes

Financial Liabilities - Changes in Current and Non-Current Financial Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Financial Liabilities Activity [Roll Forward]
Borrowings, Current portion, Beginning balance	$ 5,524
Other financial liabilities, Current portion, Beginning balance	477
Derivative instruments, Current portion, Beginning balance	1,968
Financial liabilities, Current portion, Beginning balance	7,969
Borrowings, Non current portion, Beginning balance	77,397
Other financial liabilities, Non current portion, Beginning balance	214
Financial liabilities, Non current portion, Beginning balance	77,611
Borrowings, Beginning balance	82,921
Other financial liabilities, Beginning balance	691
Derivative instruments, Beginning balance	1,968
Financial liabilities, Beginning balance	85,580
New borrowings	2,088
Repayments of financial liabilities	(79,601)
Change in scope	0
Other	(2,020)
Currency translation adjustment	2,425
Borrowings, Current portion, Ending balance	5,376
Other financial liabilities, Current portion, Ending balance	475
Derivative instruments, Current portion, Ending balance	0
Financial liabilities, Current portion, Ending balance	5,851
Borrowings, Non current portion, Ending balance	2,103
Other financial liabilities, Non current portion, Ending balance	518
Financial liabilities, Non current portion, Ending balance	2,621
Borrowings, Ending balance	7,479
Other financial liabilities, Ending balance	993
Derivative instruments, Ending balance	0
Financial liabilities, Ending balance	8,472
Borrowings
Financial Liabilities Activity [Roll Forward]
New borrowings	1,593
Repayments of borrowings	(79,360)
Change in scope	0
Other	0
Currency translation adjustment	2,325
Other financial liabilities
Financial Liabilities Activity [Roll Forward]
New borrowings	495
Repayments of other financial liabilities	(241)
Change in scope	0
Other	0
Currency translation adjustment	48
Financial derivatives
Financial Liabilities Activity [Roll Forward]
Change in scope	0
Other	(2,020)
Currency translation adjustment	52
Financial liabilities, Current portion
Financial Liabilities Activity [Roll Forward]
New borrowings	1,728
Repayments of financial liabilities	(79,601)
Change in scope	0
Other	75,486
Currency translation adjustment	269
Financial liabilities, Current portion | Borrowings
Financial Liabilities Activity [Roll Forward]
New borrowings	1,593
Repayments of borrowings	(79,360)
Change in scope	0
Other	77,436
Currency translation adjustment	183
Financial liabilities, Current portion | Other financial liabilities
Financial Liabilities Activity [Roll Forward]
New borrowings	135
Repayments of other financial liabilities	(241)
Change in scope	0
Other	70
Currency translation adjustment	34
Financial liabilities, Current portion | Financial derivatives
Financial Liabilities Activity [Roll Forward]
Change in scope	0
Other	(2,020)
Currency translation adjustment	52
Financial liablities, Non current portion
Financial Liabilities Activity [Roll Forward]
New borrowings	360
Repayments of financial liabilities	0
Change in scope	0
Other	(77,506)
Currency translation adjustment	2,156
Financial liablities, Non current portion | Borrowings
Financial Liabilities Activity [Roll Forward]
New borrowings	0
Repayments of borrowings	0
Change in scope	0
Other	(77,436)
Currency translation adjustment	2,142
Financial liablities, Non current portion | Other financial liabilities
Financial Liabilities Activity [Roll Forward]
New borrowings	360
Repayments of other financial liabilities	0
Change in scope	0
Other	(70)
Currency translation adjustment	$ 14

Financial Liabilities - Additio

Financial Liabilities - Additional Information (Details) - Revolving credit facility - RCF	Jun. 30, 2017CNY (¥)	Jun. 30, 2017USD ($)	Mar. 29, 2017EUR (€)	Mar. 28, 2017EUR (€)	Sep. 30, 2015CNY (¥)	Sep. 30, 2015EUR (€)	Sep. 29, 2015CNY (¥)	Sep. 29, 2015EUR (€)
Multicurrency revolving facility agreement
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity			€ 350,000,000	€ 250,000,000		€ 350,000,000		€ 250,000,000
HSBC revolving loan facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity	¥ 50,000,000	$ 7,400,000			¥ 50,000,000		¥ 40,000,000

Share-Based Compensation - Narr

Share-Based Compensation - Narrative (Details)	Jun. 27, 2017shares	Apr. 27, 2017shares	Mar. 01, 2017shares	Jun. 30, 2017grantshares
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted (in shares)	135,500	139,386	231,460	1,402,932
OSA/BSPCE
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)				355,010
BSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of grants | grant				1
RSUs granted (in shares)	355,010
Options granted (in shares)			10,825	10,825
Senior management | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted (in shares)	896,586

Share-Based Compensation - Chan

Share-Based Compensation - Change in Number of BSPCE/OSA/RSU/BSA (Details) - shares	Jun. 27, 2017	Apr. 27, 2017	Mar. 01, 2017	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments [Roll Forward]
Beginning balance (in shares)				8,391,496
Granted (in shares)				1,768,767
Exercised (in shares)				(1,313,773)
Forfeited (in shares)				(359,360)
Expired (in shares)				0
Ending balance (in shares)				8,487,130
OSA/BSPCE
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, options (in shares)				4,960,092
Granted, options (in shares)				355,010
Exercised, options (in shares)				(1,270,417)
Forfeited, options (in shares)				(172,844)
Expired, options (in shares)				0
Ending balance, options (in shares)				3,871,841
RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (in shares)				3,243,279
Granted (in shares)	135,500	139,386	231,460	1,402,932
Forfeited (in shares)				(186,516)
Ending balance (in shares)				4,459,695
BSAs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, options (in shares)				188,125
Granted, options (in shares)			10,825	10,825
Exercised, options (in shares)				(43,356)
Forfeited, options (in shares)				0
Expired, options (in shares)				0
Ending balance, options (in shares)				155,594
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)	355,010

Share-Based Compensation - Brea

Share-Based Compensation - Breakdown of the Closing Balance (Details) - € / shares	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
OSA/BSPCE
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number outstanding, options (in shares)	3,871,841	4,960,092
Weighted-average exercise price, options (in Euro per share)	€ 27.28
Number vested, options (in shares)	2,076,322
Weighted-average exercise price, options (in Euro per share)	€ 20.63
Weighted-average remaining contractual life of options outstanding, in years	7 years 3 months 20 days
RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number outstanding (in shares)	4,459,695	3,243,279
Number vested (in shares)	19,747
BSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number outstanding, options (in shares)	155,594	188,125
Weighted-average exercise price, options (in Euro per share)	€ 23.07
Number vested, options (in shares)	106,060
Weighted-average exercise price, options (in Euro per share)	€ 15.32
Weighted-average remaining contractual life of options outstanding, in years	7 years 1 month 22 days

Share-Based Compensation - Shar

Share-Based Compensation - Share-based compensation expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ (14,704)	$ (7,233)	$ (29,287)	$ (15,514)
Total equity awards compensation expense	(14,918)	(7,695)	(29,858)	(16,065)
R&D
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	(4,459)	(2,179)	(8,375)	(4,581)
Total equity awards compensation expense	(4,459)	(2,179)	(8,375)	(4,581)
S&O
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	(6,406)	(2,488)	(13,116)	(5,878)
Total equity awards compensation expense	(6,406)	(2,488)	(13,116)	(5,878)
G&A
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	(3,839)	(2,566)	(7,796)	(5,055)
Total equity awards compensation expense	(4,053)	(3,028)	(8,367)	(5,606)
RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	(13,582)	(4,459)	(26,042)	(8,483)
RSUs | R&D
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	(4,040)	(1,459)	(7,512)	(2,715)
RSUs | S&O
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	(6,875)	(1,816)	(13,135)	(3,484)
RSUs | G&A
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	(2,667)	(1,184)	(5,395)	(2,284)
Share options / BSPCE
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	(1,122)	(2,774)	(3,245)	(7,031)
Share options / BSPCE | R&D
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	(419)	(720)	(863)	(1,866)
Share options / BSPCE | S&O
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	469	(672)	19	(2,394)
Share options / BSPCE | G&A
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	(1,172)	(1,382)	(2,401)	(2,771)
BSAs
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Issuance of Stock and Warrants for Services or Claims	(214)	(462)	(571)	(551)
BSAs | R&D
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Issuance of Stock and Warrants for Services or Claims	0	0	0	0
BSAs | S&O
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Issuance of Stock and Warrants for Services or Claims	0	0	0	0
BSAs | G&A
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Issuance of Stock and Warrants for Services or Claims	$ (214)	$ (462)	$ (571)	$ (551)

Financial Income and Expenses -

Financial Income and Expenses - Financial income (expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Income and Expenses [Abstract]
Financial income from cash equivalents	$ 202	$ 482	$ 449	$ 870
Interest and fees	(656)	(612)	(1,412)	(1,088)
Interest on debt	(650)	(513)	(1,218)	(783)
Fees	(6)	(99)	(194)	(305)
Foreign exchange gain (loss)	(1,625)	41	(3,433)	(1,175)
Other financial expense	(15)	(5)	(31)	(19)
Total financial income (expense)	$ (2,094)	$ (94)	$ (4,427)	$ (1,412)

Financial Income and Expenses62

Financial Income and Expenses - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Financial income (expense)	$ 2,094,000	$ 94,000	$ 4,427,000	$ 1,412,000
RCF | Multicurrency revolving facility agreement | Revolving credit facility
Debt Instrument [Line Items]
Long-term line of credit	$ 0		$ 0		$ 75,000,000

Income Taxes - Breakdown of Inc

Income Taxes - Breakdown of Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Current income tax			$ (20,271)	$ (16,818)
France			(7,289)	(8,172)
International			(12,982)	(8,646)
Net change in deferred taxes	$ 5,536	$ 3,285	12,405	4,424
France			(944)	4,216
International			13,349	208
Provision for income taxes	$ (3,665)	$ (4,450)	$ (7,866)	$ (12,394)
Estimated tax rate			30.00%	28.00%
Effective tax rate			26.00%	28.00%

Earnings Per Share - Basic Earn

Earnings Per Share - Basic Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to shareholders of Criteo S.A.	$ 5,970	$ 12,200	$ 18,411	$ 29,330
Weighted average number of shares outstanding (in shares)	65,027,985	63,246,785	64,611,237	62,928,221
Basic earnings per share (in USD per share)	$ 0.09	$ 0.19	$ 0.28	$ 0.47

Earnings Per Share - Diluted Ea

Earnings Per Share - Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to shareholders of Criteo S.A.	$ 5,970	$ 12,200	$ 18,411	$ 29,330
Weighted average number of shares outstanding (in shares)	65,027,985	63,246,785	64,611,237	62,928,221
Dilutive effect of :
Restricted share units (RSU's) (in shares)	1,598,093	189,980	1,438,010	94,990
Share options and employee warrants (BSPCEs) (in shares)	1,427,448	2,104,298	1,574,728	2,124,592
Non-employees warrants (BSAs) (in shares)	77,748	84,034	85,814	85,135
Weighted average number of shares outstanding used to determine diluted earnings per share (in shares)	68,131,274	65,625,097	67,709,789	65,232,938
Diluted earnings per share (in USD per share)	$ 0.09	$ 0.19	$ 0.27	$ 0.45

Earnings Per Share - Weighted A

Earnings Per Share - Weighted Average Number of Anti-Dilutive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of anti-dilutive securities excluded from diluted earnings per share (in shares)	140,839	958,970	406,740	914,940
Restricted share awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of anti-dilutive securities excluded from diluted earnings per share (in shares)	11,834	134,112	120,782	502,511
Share options / BSPCE
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of anti-dilutive securities excluded from diluted earnings per share (in shares)	129,005	824,858	285,958	412,429
BSAs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of anti-dilutive securities excluded from diluted earnings per share (in shares)	0	0	0	0

Commitments and contingencies -

Commitments and contingencies - Commitments (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017CNY (¥)	Jun. 30, 2017EUR (€)	Jun. 30, 2017USD ($)	Mar. 29, 2017EUR (€)	Mar. 28, 2017EUR (€)	Dec. 31, 2016USD ($)	Sep. 30, 2015CNY (¥)	Sep. 30, 2015EUR (€)	Sep. 29, 2015CNY (¥)	Sep. 29, 2015EUR (€)
Commitments and Contingencies Disclosure [Abstract]
Operating lease expenses	$ 8,600,000	$ 7,600,000	$ 17,400,000	$ 15,000,000
Hosting costs	$ 17,100,000	$ 10,500,000	$ 31,000,000	$ 19,800,000
Revolving credit facility | RCF | HSBC revolving loan facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity					¥ 50,000,000		$ 7,400,000				¥ 50,000,000		¥ 40,000,000
Long-term line of credit					¥ 30,000,000		4,400,000
Revolving credit facility | RCF | Bank syndicate RCF
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity						€ 350,000,000	399,400,000
Long-term line of credit						€ 0	0
Revolving credit facility | RCF | Multicurrency revolving facility agreement
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity | €								€ 350,000,000	€ 250,000,000			€ 350,000,000		€ 250,000,000
Long-term line of credit							$ 0			$ 75,000,000

Commitments and contingencies68

Commitments and contingencies - Contingencies (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Loss Contingency Accrual [Roll Forward]
Contingencies accrual, beginning balance	$ 654
Charges	960
Provision used	(24)
Provision released not used	(250)
Currency translation adjustments	52
Contingencies accrual, ending balance	1,392
Contingencies accrual, of which current	1,392
Provision for employee-related litigation
Loss Contingency Accrual [Roll Forward]
Contingencies accrual, beginning balance	485
Charges	6
Provision used	0
Provision released not used	(250)
Currency translation adjustments	26
Contingencies accrual, ending balance	267
Contingencies accrual, of which current	267
Other provisions
Loss Contingency Accrual [Roll Forward]
Contingencies accrual, beginning balance	169
Charges	954
Provision used	(24)
Provision released not used	0
Currency translation adjustments	26
Contingencies accrual, ending balance	1,125
Contingencies accrual, of which current	$ 1,125

Breakdown of Revenue and Non-69

Breakdown of Revenue and Non-Current Assets by Geographical Areas - Revenue by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 542,022	$ 407,201	$ 1,058,688	$ 808,454
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	229,392	156,522	437,405	303,695
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	191,682	153,899	380,774	313,305
Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 120,948	$ 96,780	$ 240,509	$ 191,454

Breakdown of Revenue and Non-70

Breakdown of Revenue and Non-Current Assets by Geographical Areas - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)market	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)market	Jun. 30, 2016USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of geographical markets | market	3		3
Revenue	$ 542,022	$ 407,201	$ 1,058,688	$ 808,454
Concentration risk, percentage				2.30%
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 36,100	$ 30,900	$ 73,600	$ 63,400
Sales Revenue, Net [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			2.10%

Breakdown of Revenue and Non-71

Breakdown of Revenue and Non-Current Assets by Geographical Areas - Revenue by Significant Other Countries (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 542,022	$ 407,201	$ 1,058,688	$ 808,454
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	200,801	134,351	380,464	261,264
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	41,882	30,891	84,496	64,586
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	26,422	27,230	54,619	55,739
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 87,400	$ 66,590	$ 172,710	$ 132,564

Breakdown of Revenue and Non-72

Breakdown of Revenue and Non-Current Assets by Geographical Areas - Other Information (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	$ 235,391	$ 211,525
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	135,241	123,308
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	134,701	122,474
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	7,991	7,132
Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	21,354	26,033
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	7,772	8,965
Holding
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	$ 70,805	$ 55,052