Summary of Significant Accounting Policies | 2. Summary of Significant Accounting Policies Principles of Consolidation Unaudited Interim Condensed Consolidated Financial Statements Use of Estimates Marketable Securities Revenue Recognition — Revenue from the Company’s premium services is recognized on a daily basis over the subscription term as the services are delivered, provided that there is persuasive evidence of an arrangement, the fee is fixed or determinable and collectability is deemed reasonably assured. Subscription periods range from monthly to ten years, but are generally one year in duration. The Company’s software cannot be run on another entity’s hardware and customers do not have the right to take possession of the software and use it on their own or another entity’s hardware. The Company’s multi-element arrangements typically include subscription and professional services, which may include development services. The Company evaluates each element within the arrangement to determine if they can be accounted for as separate units of accounting. If the delivered item or items have value to the customer on a standalone basis, either because they are sold separately by any vendor or the customer could resell the delivered item or items on a standalone basis, the Company has determined that the deliverables within these arrangements qualify for treatment as separate units of accounting. Accordingly, the Company recognizes revenue for each delivered item or items as a separate earnings process commencing when all of the significant performance obligations have been performed and when all of the revenue recognition criteria have been met. Professional services revenue recognized as a separate earnings process under multi-element arrangements has been immaterial to date. In cases where the Company has determined that the delivered items within its multi-element arrangements do not have value to the customer on a stand-alone basis, the arrangement is accounted for as a single unit of accounting and the related consideration is recognized ratably over the estimated customer life, commencing when all of the significant performance obligations have been delivered and when all of the revenue recognition criteria have been met. Revenue from multi-element arrangements accounted for as a single unit of accounting which do not have value to the customer has been immaterial to date. Concentrations of Credit Risk and Significant Customers For the three and six months ended June 30, 2015 and 2016, no customers accounted for more than 10% of revenue. As of December 31, 2015 and June 30, 2016, no customers accounted for more than 10% of accounts receivable. Goodwill Long-Lived Assets and Intangible Assets The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets, including intangible assets, may not be recoverable. When such events occur, the Company compares the carrying amounts of the assets to their undiscounted expected future cash flows. If this comparison indicates that there is impairment, the amount of the impairment is calculated as the difference between the carrying value and fair value. Through June 30, 2016, the Company recorded no material impairments. Foreign Currency Translation — Stock-Based Compensation — Income Taxes The Company evaluates its uncertain tax positions based on a determination of whether and how much of a tax benefit taken by the Company in its tax filings is more likely than not to be realized. Potential interest and penalties associated with any uncertain tax positions are recorded as a component of income tax expense. As of December 31, 2015 and June 30, 2016, the Company has provided a liability for $0.9 million and $1.1 million, respectively, for uncertain tax positions. These uncertain tax positions would impact the Company’s effective tax rate if recognized. Segment Data The Company’s revenue by geography (based on customer address) is as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2016 2015 2016 Revenues: United States $ 45,844 $ 59,476 $ 88,473 $ 116,727 United Kingdom 5,124 6,523 10,009 12,709 International—all other 13,866 17,267 27,461 33,564 Total revenue $ 64,834 $ 83,266 $ 125,943 $ 163,000 The Company’s revenue by service cloud (product grouping) is as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2016 2015 2016 Revenues: Collaboration cloud $ 21,055 $ 28,849 $ 40,218 $ 55,597 Identity and Access Management cloud 21,802 29,292 41,999 57,744 Service and Support cloud 21,206 24,451 42,420 48,362 Other 771 674 1,306 1,297 Total revenue $ 64,834 $ 83,266 $ 125,943 $ 163,000 Guarantees and Indemnification Obligations — In the ordinary course of business, the Company enters into agreements with certain customers that contractually obligate the Company to provide indemnifications of varying scope and terms with respect to certain matters including, but not limited to, losses arising out of the breach of such agreements, from the services provided by the Company or claims alleging that the Company’s products infringe third-party patents, copyrights, or trademarks. The term of these indemnification obligations is generally perpetual. The maximum potential amount of future payments the Company could be required to make under these indemnification obligations is, in many cases, unlimited. Through June 30, 2016, the Company has not experienced any losses related to these indemnification obligations. Net Income Per Share — The Company excluded the following options to purchase common shares and restricted stock units from the computation of diluted net income per share because they had an anti-dilutive impact (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2016 2015 2016 Options to purchase common shares — — 26 — Restricted stock units 473 337 489 429 Total options and restricted stock units 473 337 515 429 Basic and diluted net income per share was calculated as follows (in thousands, except per share data): Three months ended June 30, Six months ended June 30, 2015 2016 2015 2016 Basic: Net income $ 2,388 $ 2,506 $ 2,760 $ 1,433 Weighted average common shares outstanding, basic 24,703 25,135 24,620 25,144 Net income per share, basic $ 0.10 $ 0.10 $ 0.11 $ 0.06 Diluted: Net income $ 2,388 $ 2,506 $ 2,760 $ 1,433 Weighted average common shares outstanding 24,703 25,135 24,620 25,144 Add: Common stock equivalents 970 693 995 697 Weighted average common shares outstanding, diluted 25,673 25,828 25,615 25,841 Net income per share, diluted $ 0.09 $ 0.10 $ 0.11 $ 0.06 Recently Issued Accounting Pronouncements Revenue from Contracts with Customers On February 25, 2016, the FASB issued ASU 2016-02, Leases , On March 30, 2016, the FASB issued ASU 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting |