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Summary of significant accounting policies (Policies) | 12 Months Ended
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Dec. 31, 2012
Summary of significant accounting policies |
Basis of presentation and consolidation | Basis of presentation and consolidation Our consolidated financial statements for the years ended December 31, 2012, 2011 and 2010 have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). The accompanying consolidated financial statements include our accounts and our majority owned subsidiaries. We consolidate our 70% ownership of Concourse Communications Detroit, LLC and our 70% ownership of Chicago Concourse Development Group, LLC in accordance with Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 810, Consolidation. Other parties' interests in consolidated entities are reported as non-controlling interests. The results of operations for the acquisition of companies accounted for under the purchase method have been included in the accompanying consolidated statements of operations beginning on the closing date of the acquisition. All intercompany balances and transactions have been eliminated in consolidation.
Use of estimates | Use of estimates The preparation of accompanying consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the dates of the accompanying consolidated financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Assets and liabilities which are subject to significant judgment and the use of estimates include the allowance for doubtful accounts, recoverability of goodwill and long-lived assets, valuation allowances with respect to deferred tax assets, useful lives associated with property and equipment, valuation and useful lives of and intangible assets, and the valuation and assumptions underlying stock-based compensation and other equity instruments. On an ongoing basis, we evaluate our estimates compared to historical experience and trends, which form the basis for making judgments about the carrying value of assets and liabilities. In addition, prior to our IPO, we regularly engaged the assistance of valuation specialists in determining fair value measurements in connection with stock-based compensation and other equity instruments.
Reclassifications | Reclassifications We reclassified $335 from other assets to intangible assets in the consolidated balance sheet as of December 31, 2011 to conform to the current year presentation. The reclassification had no impact on net income or stockholders' equity.
Concentrations of credit risk | Concentrations of credit risk Financial instruments that potentially subject us to significant concentrations of credit risk consist primarily of cash and cash equivalents, restricted cash, marketable securities and accounts receivable. We maintain our cash and cash equivalents, restricted cash and marketable securities with institutions with high credit ratings. We extend credit based upon the evaluation of the customer's financial condition and generally collateral is not required. We maintain an allowance for doubtful accounts based upon expected collectability of accounts receivable. We primarily estimate our allowance for doubtful accounts based on a specific review of significant outstanding accounts receivable. For the year ended December 31, 2012, two groups of affiliated entities accounted for 31% of total revenue. For the year ended December 31, 2011, one group of affiliated entities accounted for 18% of total revenue. At December 31, 2012, three groups of affiliated entities accounted for 26%, 16% and 10% of the total accounts receivable, respectively. At December 31, 2011, one group of affiliated entities and two customers accounted for 23%, 17% and 12% of the total accounts receivable, respectively.
Cash and cash equivalents | Cash and cash equivalents Cash and cash equivalents include highly liquid investments that are readily convertible into known amounts of cash with original maturities of three months or less when acquired. At December 31, 2012, cash equivalents consisted of money market funds and marketable securities with original maturities of three months or less. At December 31, 2011, cash equivalents consisted of money market funds.
Marketable securities | Marketable securities Our marketable securities consist of available-for-sale securities with original maturities exceeding three months. In accordance with FASB ASC 320, Investments—Debt and Equity Securities, we have classified securities, which have readily determinable fair values and are highly liquid, as short-term because such securities are expected to be realized within a one- year period. At December 31, 2012 and 2011, we had $41,558 and $0, respectively, in short-term marketable securities and no long-term marketable securities. Marketable securities are reported at fair value with the related unrealized gains and losses reported as other comprehensive income (loss) until realized or until a determination is made that an other-than-temporary decline in market value has occurred. No significant unrealized gains and losses have been reported during the years presented. Factors considered by us in assessing whether an other-than-temporary impairment has occurred include the nature of the investment, whether the decline in fair value is attributable to specific adverse conditions affecting the investment, the financial condition of the investee, the severity and the duration of the impairment and whether we have the ability to hold the investment to maturity. When it is determined that an other-than-temporary impairment has occurred, the investment is written down to its market value at the end of the period in which it is determined that an other-than-temporary decline has occurred. The cost of marketable securities sold is based upon the specific identification method. Any realized gains or losses on the sale of investments are reflected as a component of interest and other income (expense), net. For the years ended December 31, 2012, 2011 and 2010, we had no significant realized or unrealized gains or losses from investments in marketable securities classified as available-for-sale.
Restricted cash | Restricted cash Restricted cash consists of letters of credit with our landlords or municipalities for which we have operating agreements. Letters of credit are supported by cash deposits made by us and invested into bank certificates of deposit. At December 31, 2012 and 2011, we had $30 and $465 classified as short-term restricted cash, respectively. At December 31, 2012 and 2011, we had no restricted cash classified as long-term.
Fair value of financial instruments | Fair value of financial instruments Fair value is defined as the price that would be received from selling an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, we consider the principal or most advantageous market in which it would transact, and we consider assumptions that market participants would use when pricing the asset or liability. The accounting guidance for fair value measurement also requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard establishes a fair value hierarchy based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument's categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows: • Level 1—Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. • Level 2—Quoted prices for identical assets and liabilities in markets that are not active, quoted prices for similar assets and liabilities in active markets or financial instruments for which significant inputs are observable, either directly or indirectly. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The carrying amount reflected in the accompanying consolidated balance sheets for cash and cash equivalents, restricted cash, marketable securities, accounts receivable, prepaid expenses and other current assets, accounts payable, accrued expenses and other liabilities approximates fair value due to the short-term nature of these financial instruments.
Business combinations | Business combinations The results of businesses acquired in a business combination are included in the Company's consolidated financial statements from the date of the acquisition. Purchase accounting results in assets and liabilities of an acquired business being recorded at their estimated fair values on the acquisition date. Any excess consideration over the fair value of assets acquired and liabilities assumed is recognized as goodwill. The Company performs valuations of assets acquired and liabilities assumed for an acquisition and allocates the purchase price to its respective net tangible and intangible assets. Determining the fair value of assets acquired and liabilities assumed requires management to use significant judgment and estimates including the selection of valuation methodologies, estimates of future revenues and cash flows, discount rates and selection of comparable companies. The Company engages the assistance of valuation specialists in concluding on fair value measurements in connection with fair values of assets and liabilities assumed in a business combination. Transaction costs associated with business combinations are expensed as incurred, and are included in general and administrative expenses in the consolidated statements of operations. Transaction costs were $50 for the year ended December 31, 2012. There were no transaction costs for the year ended December 31, 2011.
Property and equipment | Property and equipment Property and equipment are stated at historical cost, less accumulated depreciation and amortization. Additions and improvements are capitalized while routine repairs and maintenance are charged to expense when incurred. Depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets as follows:
Computer equipment |  | 2 to 5 years
Software |  | 2 to 5 years
Office equipment |  | 3 to 5 years
Leasehold improvements |  | The shorter of the estimated useful life or the remaining term of the agreements, generally ranging from 3 to 15 years
Leasehold improvements are principally comprised of network equipment located at various managed and operated locations, primarily airports, under exclusive, long-term, non-cancellable contracts to provide wireless communication network access.
Equipment and software under capital lease | Equipment and software under capital lease We lease certain data communications equipment, other equipment and software under capital lease agreements. The assets and liabilities under capital lease are recorded at the lesser of the present value of aggregate future minimum lease payments, including estimated bargain purchase options, or the fair value of the asset under lease. Assets under capital lease are depreciated using the straight-line method over the estimated useful lives of the assets.
Software development costs | Software development costs We capitalize costs associated with software developed or obtained for internal use when the preliminary project stage is completed and it is determined that the software will provide significantly enhanced capabilities and modifications. These capitalized costs are included in property and equipment and include external direct cost of services procured in developing or obtaining internal-use software and personnel and related expenses for employees who are directly associated with, and who devote time to internal-use software projects. Capitalization of these costs ceases once the project is substantially complete and the software is ready for its intended purpose, and once the software is ready for its intended use, the costs are amortized over the useful life of the software. Post-configuration training and maintenance costs are expensed as incurred.
Long-lived assets | Long-lived assets Intangible assets consist of acquired venue contracts, technology, advertiser relationships and trade names. We record intangible assets at fair value and amortize these finite-lived assets over the shorter of the contractual life or the estimated useful life on a straight-line basis. We estimate the useful lives of acquired intangible assets based on factors that include the planned use of each acquired intangible asset, the expected pattern of future cash flows to be derived from each acquired intangible asset and contractual periods specified in the related agreements. As such, we account for each of the venue contracts individually. We include amortization of acquired intangibles in amortization of intangible assets in the accompanying consolidated statements of operations. We perform an impairment review of long-lived assets held and used whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Factors we consider important that could trigger an impairment review include, but are not limited to: significant under-performance relative to projected future operating results, significant changes in the manner of our use of the acquired assets or our overall business and product strategies and significant industry or economic trends. When we determine that the carrying value of a long-lived asset may not be recoverable based upon the existence of one or more of these indicators, we determine the recoverability by comparing the carrying amount of the asset to net future undiscounted cash flows that the asset is expected to generate or other indices of fair value. We would then recognize an impairment charge equal to the amount by which the carrying amount exceeds the fair market value of the asset.
Goodwill | Goodwill Goodwill represents the excess of the purchase price over the fair value of net assets acquired in connection with the acquisition of Concourse Communication Group, LLC in June 2006 and the acquisition of Cloud 9 Wireless, Inc. ("Cloud 9") in August 2012. We test goodwill for impairment in accordance with guidance provided by FASB ASC 350, Intangibles—Goodwill and Other ("ASC 350"). Goodwill is tested for impairment at least annually at the reporting unit level or whenever events or changes in circumstances indicate that goodwill might be impaired. Events or changes in circumstances which could trigger an impairment review include a significant adverse change in legal factors or in the business climate, an adverse action or assessment by a regulator, unanticipated competition, a loss of key personnel, significant changes in the manner of our use of the acquired assets or the strategy for our overall business, significant negative industry or economic trends, or significant underperformance relative to expected historical or projected future results of operations. We perform our impairment test annually on December 31st. In September 2011, the FASB issued revised guidance to simplify how entities test goodwill for impairment. Under the revised guidance, entities have the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test described in FASB ASC 350. If, after assessing qualitative factors, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. If deemed necessary, a two-step test is used to identify the potential impairment and to measure the amount of goodwill impairment, if any. The first step is to compare the fair value of the reporting unit with its carrying amount, including goodwill. If the fair value of the reporting unit exceeds its carrying amount, goodwill is considered not impaired; otherwise, there is an indication that goodwill maybe impaired and the amount of the loss, if any, is measured by performing step two. Under step two, the impairment loss, if any, is measured by comparing the implied fair value of the reporting unit goodwill with the carrying amount of goodwill. Currently, we have one reporting unit, one operating segment and one reportable segment. At December 31, 2012 and 2011, all of the goodwill was attributed to our reporting unit. We tested our goodwill for impairment and no impairment was identified as the fair value of our reporting unit was substantially in excess of its carrying amount. To date, we have not recorded any goodwill impairment charges.
Revenue recognition | Revenue recognition We generate revenue from several sources including: (i) retail customers under subscription plans for month-to-month network access that automatically renew, and retail single-use access from sales of hourly, daily or other single-use access plans, (ii) platform service arrangements with wholesale customers that provide software licensing, network access, and professional services fees, (iii) wholesale customers that are telecom operators under long-term contracts for access to our distributed antenna system ("DAS") at our managed and operated locations, and (iv) display advertisements and sponsorships on our walled garden sign-in pages. Software licensed by our wholesale platform services customers can only be used during the term of the service arrangements and has no utility to them upon termination of the service arrangement. We recognize revenue when an arrangement exists, services have been rendered, fees are fixed or determinable, no significant obligations remain related to the earned fees and collection of the related receivable is reasonably assured. Subscription fees from retail customers are paid monthly in advance and revenue is deferred for the portions of monthly recurring subscription fees collected in advance. We do not have a stated or published refund policy for our Wi-Fi service, although our customer service representatives will provide a refund on a case-by-case basis. These amounts are not significant and are recorded as contra-revenue in the period the refunds are made. Subscription fee revenue is recognized ratably over the subscription period. Revenue generated from retail single-use access is recognized when earned. Services provided to wholesale partners under platform service arrangements generally contain several elements including: (i) a term license to use our software to access our Wi-Fi network, (ii) access fees for network usage, and (iii) professional services for software integration and customization and to maintain the Wi-Fi service. The term license, monthly minimum network access fees and professional services are billed on a monthly basis based upon predetermined fixed rates. Once the term license for integration and customization are delivered, the fees from the arrangement are recognized ratably over the remaining term of the platform service arrangement. The initial term of platform service license agreements is generally between two to five years and the agreements generally contain renewal clauses. Revenue for network access fees in excess of the monthly minimum amounts is recognized when earned. All elements within existing platform service arrangements are generally delivered and earned concurrently throughout the term of the respective service arrangement. Revenue generated from access to our DAS networks consists of build-out fees and recurring access fees under certain long-term contracts with telecom operators. Build-out fees paid upfront are generally deferred and recognized ratably over the term of the estimated customer relationship period, once the build-out is complete. Minimum monthly access fees for usage of the DAS networks are non-cancellable and generally escalate on an annual basis. These minimum monthly access fees are recognized ratably over the term of the estimated customer relationship period. The initial term of our contracts with telecom operations and wholesale partners generally range from three to fifteen years and the agreements generally contain renewal clauses. Revenue from network access fees in excess of the monthly minimums is recognized when earned. In instances where the minimum monthly network access fees escalate over the term of the wholesale service arrangement, an unbilled receivable is recognized when performance is within our control and when we have reasonable assurance that the unbilled receivable balance will be collected. We adopted the provisions of ASU 2009-13, Revenue Recognition (Topic 605)—Multiple-Deliverable Revenue Arrangements ("ASU 2009-13"), on a prospective basis on January 1, 2011. For multiple-deliverable arrangements entered into prior to January 1, 2011 that are accounted for under ASC 605-25, Revenue Recognition—Multiple- Deliverable Revenue Arrangements, we defer recognition of revenue for the full arrangement and recognize all revenue ratably over the wholesale service period for platform service arrangements and the term of the estimated customer relationship period for DAS arrangements, as we do not have evidence of fair value for the undelivered elements in the arrangement. For multiple-deliverable arrangements entered into or materially modified after January 1, 2011 that are accounted for under ASC 605-25, we evaluate whether or not separate units of accounting exist and then allocate the arrangement consideration to all units of accounting based on the relative selling price method using estimated selling prices as vendor specific objective evidence and third party evidence is not available. We recognize the revenue associated with the separate units of accounting upon completion of such services or ratably over the wholesale service period for platform service arrangements and the term of the estimated customer relationship period for DAS arrangements. Advertising and other revenue is recognized when the services are performed.
Revenue Share | Network access Network access costs consist primarily of revenue share payments to venue owners where our managed and operated hotspots are located, usage-based fees to our roaming network partners for access to their networks, depreciation of equipment related to network build-out projects in our managed and operated locations, and bandwidth and other Internet connectivity expenses in our managed and operated locations.
Advertising, marketing and promotion costs | Advertising, marketing and promotion costs Advertising production costs are expensed the first time the advertisement is run. No advertising production costs were capitalized for the years ended December 31, 2012, 2011 and 2010. All other costs of advertising, marketing and promotion are expensed as incurred. Advertising expenses charged to operations totaled $2,374, $1,393 and $579 for the years ended December 31, 2012, 2011 and 2010, respectively.
Stock-based compensation | Stock-based compensation To date, our stock-based compensation has consisted of stock options granted to employees and non-employees. We recognize stock-based compensation expense in accordance with guidance provided by FASB ASC 718, Compensation—Stock Compensation ("ASC 718"). We measure employee stock-based compensation cost at grant date, based on the estimated fair value of the award and recognize the cost on a straight-line basis, net of estimated forfeitures, over the employee requisite service period. We estimate the fair value of stock options using a Black-Scholes option pricing model. The model requires input of assumptions regarding expected term, expected volatility, dividend yield, and a risk-free rate. The weighted average assumptions that were used to calculate the grant date fair value of our employee stock option grants for the following periods are as follows:
|  | December 31, |
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|  | 2012 |  | 2011 |  | 2010 |
Expected term (years) |  |  | 5.9 |  |  | 6.4 |  |  | 6.1 |
Expected volatility |  |  | 48.9 | % |  | 49.8 | % |  | 67.6 | %
Risk-free rate |  |  | 0.9 | % |  | 2.4 | % |  | 2.5 | %
Dividend yield |  |  | 0 | % |  | 0 | % |  | 0 | %
The expected term of employee stock options represents the weighted-average period that the stock options are expected to remain outstanding. In estimating the expected term for options granted to employees, we applied the simplified method from the Security Exchange Commission ("SEC") Staff Accounting Bulletin ("SAB") Topic 14, Share-Based Payment ("SAB Topic 14"), where options are granted at-the-money. Where options were not granted at-the-money, the expected term of employee stock options represents the weighted-average period that the stock options are expected to remain outstanding and is calculated based upon actual historical exercise and post-vesting cancellations, adjusted for expected future exercise behavior. We determine the fair value of common stock underlying the stock option awards by reference to third party sales of our common stock. Prior to our initial public offering, the fair value of common stock underlying the stock option awards was determined with the assistance of a third-party valuation specialist. We determined the expected volatility assumption using the frequency of daily historical prices of comparable public companies' common stock for a period equal to the expected term of the options in accordance with guidance in ASC 718 and SAB Topic 14. We will continue to monitor peer companies and other relevant factors, including our volatility after there is enough history, used to measure expected volatility for future stock option grants. The risk-free interest rate assumption is based upon observed interest rates on the United States government securities appropriate for the expected term of our employee stock options. The dividend yield assumption is based on our history and expectation of dividend payouts for which no cash dividends have been declared or paid on our common stock, and for which none are anticipated in the foreseeable future. As stock-based compensation expense recognized in our accompanying consolidated statements of operations is based on awards ultimately expected to vest, the amount has been reduced for estimated forfeitures. ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Forfeitures were estimated based on our historical experience and future expectations. Compensation expense for non-employee stock-based awards is recognized in accordance with ASC 718 and FASB ASC 505, Equity. Stock option awards issued to non-employees are accounted for at fair value using the Black-Scholes option pricing model. Management believes that the fair value of the stock options is more reliably measured than the fair value of the services received. We record compensation expense based on the then-current fair value of the stock options at each financial reporting date. Compensation recorded during the service period is adjusted in subsequent periods for changes in the stock options' fair value until the earlier of the date at which the non-employee's performance is complete or a performance commitment is reached, which is generally when the stock award vests. There was $372 and $515 of stock-based compensation expense recognized for non-employee stock-based awards for the years ended December 31, 2012 and 2011, respectively, and none for the year ended December 31, 2010.
Income taxes | Income taxes We account for income taxes in accordance with FASB ASC 740, Accounting for Income Taxes ("ASC 740"), which requires the recognition of deferred tax assets and liabilities for the future consequences of events that have been recognized in our accompanying consolidated financial statements or tax returns. The measurement of the deferred items is based on enacted tax laws. In the event the future consequences of differences between financial reporting bases and the tax bases of our assets and liabilities result in a deferred tax asset, ASC 740 requires an evaluation of the probability of being able to realize the future benefits indicated by such asset. A valuation allowance related to a deferred tax asset is recorded when it is more likely than not that some portion or the entire deferred tax asset will not be realized. As part of the process of preparing our accompanying consolidated financial statements, we are required to estimate our income taxes in each of the jurisdictions in which we operate. We also assess temporary differences resulting from differing treatment of items, such as deferred revenue, for tax and accounting differences. We record a valuation allowance to reduce the deferred tax assets to the amount of future tax benefit that is more likely than not to be realized. ASC 740 prescribes a recognition threshold and measurement methodology to recognize and measure an income tax position taken, or expected to be taken, in a tax return. The evaluation of a tax position is based on a two-step approach. The first step requires an entity to evaluate whether the tax position would "more likely than not" be sustained upon examination by the appropriate taxing authority. The second step requires the tax position be measured at the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement. In addition, previously recognized benefits from tax positions that no longer meet the new criteria would no longer be recognized. Changes in recognition or measurement are reflected in the period in which the change occurs. We have filed, or are in the process of filing, tax returns that are subject to audit by the respective tax authorities. Although the ultimate outcome would be unknown, we believe that any adjustments that may result from tax return audits are not likely to have a material, adverse effect on our consolidated results of operations, financial position or cash flows.
Non-controlling interests | Non-controlling interests Non-controlling interests are comprised of minority holdings in Concourse Communications Detroit, LLC ("CCG Detroit") and Chicago Concourse Development Group, LLC ("CCDG"). Under the terms of the LLC agreements, we are required to distribute annually to the CCDG non-controlling interest holders 30% of allocated net profits less capital expenditures of the preceding year. For the years ended December 31, 2012 and 2011, we made distributions of $678 and $547 respectively to non-controlling interest holders. Under the terms of the limited liability company agreement for CCG Detroit ("Detroit Operating Agreement") profits and losses are allocated to the controlling and non-controlling owners based on specified terms in the Detroit Operating Agreement which reflect the relative risk and reward of each owner. The profit and loss allocation in the Detroit Operating Agreement specifies that the non-controlling owners' allocated profits are limited to the fixed distribution amounts and losses are limited to the non-controlling owners capital account balance with losses in excess of their capital account being fully allocated to the controlling common unit holder. There is no specified term in the Detroit Operating Agreement, but the term of the annual fixed distribution obligation to the non-controlling owner is the same as the term of the venue agreement between CCG Detroit and Detroit Metropolitan Wayne County Airport—which has a seven year initial term with options to extend for an additional four years. The Detroit Operating Agreement includes a distribution of $121 for 2012, and $85 for 2011 and 2010, respectively. We allocate profits and losses in CCG Detroit based on the attribution in the Detroit Operating Agreement. CCG Detroit has generated losses which reduced the non-controlling owners capital account to zero in 2009 resulting in an allocation to the controlling interest holder all operating losses and deficits created by the annual fixed distributions to the non-controlling interest holder.
Convertible preferred stock | Convertible preferred stock The convertible preferred stock contained puttable redemption features and deemed liquidation preferences upon a change-in-control, which were considered outside of the control the Company. Accretion of related issuance costs and dividends were recorded as a charge against retained earnings, or in the absence of retained earnings by charges against additional paid-in capital until fully depleted, then against the accumulated deficit. We accrete issuance costs and dividends to the earliest redemption date. For the year ended December 31, 2011, we accreted our convertible preferred stock through to their conversion date into common stock on May 3, 2011 in connection with our initial public offering. At December 31, 2012 and 2011, we had no preferred stock issued or outstanding.
Warrants exercisable into convertible preferred stock | Warrants exercisable into convertible preferred stock We account for preferred stock warrants as liabilities when the underlying preferred stock contains either puttable or mandatorily redeemable features. We issued warrants which were exercisable into the Series B convertible preferred stock in connection with capital lease arrangements. We determined that the preferred stock warrants contained puttable features as a result of the redemption provisions and deemed liquidation preferences upon a change-in-control. Accordingly, the warrants were recorded as a non-current liability and were carried at their fair value at date of issuance with decreases or increases in fair value at each reporting date recorded as other income or expense through to the final measurement date upon the exercise of the warrants. The warrants were exercisable either through cash payment of the exercise price or through net-share settlement at the option of the holder. Our preferred stock warrants outstanding of 25,196 were exercised and converted under the net-share settlement provisions into 20,172 shares of our common stock on May 3, 2011, in connection with our initial public offering.
Net income per share attributable to common stockholders | Net income per share attributable to common stockholders Basic net income per share attributable to common stockholders is calculated by dividing income attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted net income per share attributable to common stockholders adjusts the basic weighted average number of shares of common stock outstanding for the potential dilution that could occur if stock options, common stock warrants, preferred stock warrants and the convertible preferred stock were exercised or converted into common stock. Our convertible preferred stockholders were entitled to receive dividends and were not contractually obligated to share in our net income with common stockholders. The common stockholders are not entitled to receive any dividends.
Segment and geographical information | Segment and geographical information We operate as one reportable segment; a service provider of mobile Wi-Fi solutions across our managed and operated network and aggregated network for mobile devices such as laptops, smartphones and tablets. This single segment is consistent with the internal organization structure and the manner in which operations are reviewed and managed by our Chief Executive Officer, the chief operating decision maker. Revenue is predominantly generated and all significant long-lived tangible assets are held in the United States of America. We do not disclose sales by geographic area because to do so would be impracticable. The following is a summary of our revenue by primary revenue source:
|  | Year Ended December 31, |
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|  | 2012 |  | 2011 |  | 2010 |
Revenue: |  |  |  |  |  |  |  |  |  |
Retail subscription |  | $ | 32,716 |  | $ | 29,033 |  | $ | 23,561 |
Retail single-use |  |  | 13,429 |  |  | 16,054 |  |  | 17,460 |
Wholesale |  |  | 49,495 |  |  | 43,707 |  |  | 35,134 |
Advertising and other |  |  | 6,866 |  |  | 5,764 |  |  | 4,265 |
Total revenue |  | $ | 102,506 |  | $ | 94,558 |  | $ | 80,420 |
Recent accounting pronouncements | Recent accounting pronouncements In February 2013, the FASB issued Accounting Standards Update ("ASU") 2013-02, Comprehensive Income—Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income ("ASU 2013-02"). This ASU requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income ("AOCI") by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income but only if the amount reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under GAAP that provide additional detail about those amounts. ASU 2013-02 will be effective prospectively for reporting periods beginning after December 15, 2012. Early adoption is permitted. The adoption of this standard is not expected to have any impact on our financial statements as we currently do not have any amounts in AOCI. In September 2011, the FASB issued ASU 2011-08, Intangibles—Goodwill and Other: Testing Goodwill for Impairment ("ASU 2011-08"). This ASU is intended to simplify how entities test goodwill for impairment. It permits an entity to first assess qualitative factors to determine whether it is "more likely than not" that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test described in ASC 350. The more-likely-than-not threshold is defined as having a likelihood of more than 50%. ASU 2011-08 will be effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted, including for annual and interim goodwill impairment tests performed as of a date before September 15, 2011, if an entity's financial statements for the most recent annual or interim period have not yet been issued. We perform our impairment tests as of December 31st of each year. The adoption of this standard had no material impact on our financial position, results of operations or cash flows. In June 2011, the FASB issued ASU 2011-05, Comprehensive Income: Presentation of Comprehensive Income, which amends current comprehensive income guidance. This ASU eliminates the option to present the components of other comprehensive income ("OCI") as part of the statement of stockholders' equity. Instead, it requires entities to report components of comprehensive income in either (1) a continuous statement of comprehensive income or (2) two separate but consecutive statements. Under the two-statement approach, the first statement would include components of net income, which is consistent with the income statement format used today, and the second statement would include components of OCI. The ASU does not change the items that must be reported in OCI. The Company adopted this standard effective January 1, 2012. The adoption of this standard had no material impact on our financial position, results of operations or cash flows as the Company's comprehensive income currently equals net income. In May 2011, the FASB issued ASU 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S.GAAP and IFRS, that amends the wording used to describe many of the requirements in GAAP for measuring fair value and disclosing information about fair value measurements. The amendments in this ASU achieve the objectives of developing common fair value measurement and disclosure requirements in U.S. GAAP and International Financial Reporting Standards ("IFRS") and improving their understandability. Some of the requirements clarify the FASB's intent about the application of existing fair value measurement requirements while other amendments change a particular principle or requirement for measuring fair value or for disclosing information about fair value measurements. The amendments in this ASU are effective prospectively for interim and annual periods beginning after December 15, 2011, with no early adoption permitted. This standard was effective for us January 1, 2012. The adoption of this standard had no material impact on our financial position, results of operations or cash flows.

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