Organization and Summary of Significant Accounting Policies | ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations – Cartesian, Inc. (“Cartesian” or the “Company”), formerly known as The Management Network Group, Inc., was founded in 1990 as a management consulting firm specializing in providing consulting services to the converging communications industry and the financial services firms that support it. A majority of the Company's revenues are from customers in the United States, United Kingdom, and Western Europe. Cartesian's corporate offices are located in Overland Park, Kansas. Liquidity and Going Concern - To date, the Company's cash resources and cash flows from financing activities have been sufficient to allow the Company to continue its operations. However, during fiscal year 2017, net cash used in operating activities was $4.5 million . At December 30, 2017, the Company had approximately $0.8 million in cash and cash equivalents and negative net working capital of $44,000 . The Company's current capital resources may not be sufficient to repay a promissory note payable to Elutions Capital Ventures S.à r.l, a subsidiary of Elutions, in an aggregate original principal amount of $3.3 million ("Elutions Note"), if it were to be called for redemption, and to fund the Company's operations going forward. The Elutions Note matures on March 18, 2019, but may be called for redemption by the holder at any time and is payable 30 days after it is called for redemption. The Company is not in default under the Elutions Note and does not have any reason to currently expect that the Elutions Note will be called for redemption, given that the Company is paying its debts as they become due (including making timely payments of interest on the Elutions Note), and a call by the holder of the Elutions Note would cause Elutions to no longer have the right to purchase shares of stock pursuant to the Tracking Warrant if the Elutions Note is called for redemption. Under the Tracking Warrant, Elutions has the right to purchase up to 996,544 shares of common stock of the Company for $3.28 per share. The Tracking Warrant expires March 18, 2020. See Note 3, Strategic Alliance and Investment by Elutions, Inc., for additional discussion related to the Elutions Note. On March 21, 2018, Company, entered into an Agreement and Plan of Merger (the "Merger Agreement") with Cartesian Holdings, LLC, a Delaware limited liability company ("Parent" or "CHLLC") and Cartesian Holdings, Inc., a Delaware corporation and a wholly owned subsidiary of Parent ("Merger Sub"), pursuant to which, among other things, Merger Sub will merge with and into the Company, with the Company surviving as a wholly owned subsidiary of Parent (the "Merger") Pursuant to the Merger Agreement, Parent's designee made a working capital loan to the Company of $1,000,000 . In connection with the loan transaction, the Company issued the Working Capital Note to Parent's designee, Auto Cash Financing, Inc. that bears interest at an annual rate of ten percent ( 10% ). The Working Capital Note is secured by a lien on all assets of the Company and its subsidiaries (except certain assets that are pledged by the Company to Elutions Capital Ventures S.a. r.l), subordinate only to certain existing and permitted encumbrances. The Working Capital Note is due and payable in full on the earlier of (a) the closing of the Merger, (b) the date the Merger Agreement is terminated in accordance with its terms (subject to an extension of the due date in certain circumstances), or (c) September 30, 2018. The Company has no reason to believe that the Merger will not occur or that the Merger Agreement may be terminated, but if the Merger Agreement is terminated the Company would not have the ability to repay the loan without the infusion of new debt or equity capital. Under certain circumstances, we would be required to pay a termination fee of $400,000 to CHLLC in the event the Merger Agreement is terminated. See Note 16, Subsequent Events, for more information regarding these transactions. If the Elutions Note is called for redemption by the holder or if the Company realizes significant negative cash flows from operations, it will be required to seek additional debt or equity financing. Elutions has certain rights of first offer in connection with debt financings by us, subject to certain exceptions. In addition, if we obtain debt financing from other lenders, subject to certain exceptions, Elutions may require us to redeem the Elutions Note and to repurchase the shares of our common stock originally acquired by Elutions at a price based upon market prices over 15 trading days prior to the repurchase. In addition, Elutions has certain preemptive rights in connection with equity issuances by the Company, subject to certain exceptions, and Cartesian and its subsidiaries may not, without the prior written consent of Elutions, issue options, warrants or similar rights or convertible securities, other than with respect to certain excluded issuances. The Company is exploring alternatives to address its liquidity needs in the event the Elutions Note is called for redemption. However, there can be no assurance that financing will be available in amounts or on terms acceptable to the Company, if at all. The Company's ability to secure new financing may be impacted by economic and financial market conditions. If financing is obtained through the sale of additional equity securities or debt securities with equity features, it could result in dilution to the Company's stockholders. If adequate funds were not available on acceptable terms, our business, results of operations, cash flows, and financial condition could be materially adversely affected. The consolidated financial statements have been prepared assuming the Company will continue to operate as a going concern, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. In 2016, the Company adopted Accounting Standards Update 2014-15, "Presentation of Financial Statements - Going Concern", that requires management to assess conditions or events that raise substantial doubt about an entity's ability to continue as a going concern for at least one year after the financial statements are issued. Management has concluded under ASU 2014-15 that the current circumstances as discussed above raise substantial doubt about the Company's ability to continue as a going concern. If the Company is unable to generate additional cash from operations or obtain financing in addition to the working capital loan, or if the Company is unable to arrange financing to pay off the Elutions Note upon a call for redemption or the Company becomes required to repay the Working Capital Note prior to the Merger, the Company may be unable to fund its operations in the future. Although, the Company currently expects that such financing can be obtained if necessary, subject to market conditions and the Company's financial condition at the time the Company seeks such financing, provided that, if it is in the form of debt financing, such financing would be at a very high interest rate, or if it is in the form of equity financing, such financing would be on terms that would be highly dilutive to stockholders. However, there can be no assurances that sufficient liquidity can be raised from one or more of these actions or that these actions can be consummated within the period needed to meet the Company's current obligations. If the Company becomes unable to continue as a going concern, it may have to (i) seek protection under bankruptcy reorganization laws, or (ii) liquidate its assets and the values it receives for its assets in liquidation or dissolution could be significantly lower than the values reflected in the consolidated financial statements. The accompanying consolidated financial statements do not include any adjustments that might result from the outcome of this uncertainty, including any adjustments to reflect the possible future effects of the recoverability and classification of recorded asset amounts or amounts and classification of liabilities that might be necessary should the Company be unable to continue as a going concern. Principles of Consolidation - The consolidated financial statements include the accounts of Cartesian and its wholly-owned subsidiaries. All inter-company accounts and transactions have been eliminated in consolidation. Name of Subsidiary Date Formed/Acquired TMNG Europe Ltd. March 19, 1997 TMNG Canada Ltd. May 14, 1998 TMNG.com, Inc. June 18, 1999 TMNG Marketing, LLC September 5, 2000 TMNG Technologies, Inc. August 27, 2001 Cambridge Strategic Management Group, Inc. ("CSMG") March 6, 2002 Cambridge Adventis Ltd. March 17, 2006 Cartesian Ltd. ("Cartesian Limited") January 2, 2007 RVA Consulting, LLC August 3, 2007 TWG Consulting, Inc. October 5, 2007 Farncombe Technology Limited July 22, 2015 Farncombe Engineering Services Limited July 22, 2015 Farncombe France SARL July 22, 2015 Fiscal Year - The Company reports its operating results on a 52/53-week fiscal year basis. The fiscal year end is determined as the Saturday ending nearest December 31. The fiscal years ended December 30, 2017 and December 31, 2016 were each 52-week fiscal years and were comprised of four 13-week quarters. The fiscal years ended December 30, 2017 and December 31, 2016 are referred to herein as fiscal years 2017 and 2016 , respectively. Use of Estimates - The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. As described in further detail below, significant estimates include the estimates of costs to complete used to recognize revenues on fixed fee contracts, estimates for fair value of Elutions, Inc. (“Elutions”) instruments, estimates used to determine the fair value of the contingent consideration liability and identifiable intangible assets, estimates used to determine the ultimate realization of deferred tax assets and estimates used to determine the recoverability of deferred contract costs. Revenue Recognition - The Company recognizes revenue from time and materials consulting contracts in the period in which its services are performed. In addition to time and materials contracts, the Company also has fixed fee contracts. The Company recognizes revenues on milestone or deliverables-based fixed fee contracts and time and materials contracts not to exceed contract price using the percentage of completion-like method described by Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 605-35," Revenue Recognition - Construction-Type and Production-Type Contracts. " For fixed fee contracts where services are not based on providing deliverables or achieving milestones, the Company recognizes revenue on a straight-line basis over the period during which such services are expected to be performed. In connection with some fixed fee contracts, the Company may receive payments from customers that exceed revenues up to that point in time. The Company records the excess of receipts from customers over recognized revenue as deferred revenue. Deferred revenue is classified as a current liability to the extent it is expected to be earned within twelve months from the date of the balance sheet. The FASB ASC 605-35 percentage-of-completion-like methodology involves recognizing revenue using the percentage of services completed, on a current cumulative cost to total cost basis, using a reasonably consistent profit margin over the period. Due to the nature of these projects, developing the estimates of costs often requires significant judgment. Factors that must be considered in estimating the progress of work completed and ultimate cost of the projects include, but are not limited to, the availability of labor and labor productivity, the nature and complexity of the work to be performed, and the impact of delayed performance. If changes occur in delivery, productivity or other factors used in developing the estimates of costs or revenues, the Company revises its cost and revenue estimates, which may result in increases or decreases in revenues and costs, and such revisions are reflected in income in the period in which the facts that give rise to that revision become known. Although there was no revenue recognized related to sales of software for fiscal years 2017 or 2016 , the Company provides post-contract support ("PCS") services on historical software sales, including technical support and maintenance services as well as other professional services not essential to the functionality of the software. For those contracts that include PCS service arrangements which are not essential to the functionality of the software solution, the Company separates the FASB ASC 605-35 software services and PCS services utilizing the multiple-element arrangement model prescribed by FASB ASC 605-25, "Revenue Recognition - Multiple-Element Arrangements ". The Company separated the PCS service elements and allocated total contract consideration to the contract elements based on the relative fair value of those elements utilizing PCS renewal terms as evidence of fair value. Revenues from PCS services are recognized ratably on a straight-line basis over the term of the support and maintenance agreement. Cash and Cash Equivalents - Cash and cash equivalents include cash on hand, money market investments and short-term investments with original maturities of three months or less when purchased. The carrying amounts of cash and cash equivalents approximates its fair value because of their relatively short-term maturities. Property and Equipment - Property and equipment are stated at cost or acquisition date fair value less accumulated depreciation. Maintenance and repairs are charged to expense as incurred. Depreciation is based on the estimated useful lives of the assets and is computed using the straight-line method, and capital leases, if any, are amortized on a straight-line basis over the life of the lease. Asset lives range from three to seven years for furniture and fixtures, software and computer equipment. Leasehold improvements are capitalized and amortized over the life of the lease or useful life of the asset, whichever is shorter. The Company reviews long-lived assets to be held and used for impairment whenever events or changes in circumstances indicate that the carrying amount of these assets might not be recoverable in accordance with the provisions of FASB ASC 360, " Property, Plant and Equipment.” No impairments were identified in any period presented. Managed Services Implementation Revenues and Costs - Managed service arrangements provide for the delivery of a software or technology-based solution to clients over a period of time without the transfer of a license or a software sale to the customer. For long-term managed service agreements, implementation efforts are often necessary to develop the software utilized to deliver the managed service. Costs of such implementation efforts may include internal and external costs for coding or customizing systems and costs for conversion of client data. The Company may invoice its clients for implementation fees at the go-live date of the underlying solution. Lump sum implementation fees received from clients are initially deferred and recognized on a pro-rata basis as services are provided. Specific, incremental and direct costs of implementation incurred prior to the services going live are deferred pursuant to FASB ASC 605-35-25 and amortized over the period that the related ongoing services revenue is recognized to the extent that the Company believes the recoverability of the costs from the contract is probable. If a client terminates a managed services arrangement prior to the end of the contract, a loss on the contract may be recorded, if applicable, and any remaining deferred implementation revenues and costs would then be recognized into earnings generally over the remaining service period through the termination date. During the fiscal years ended December 30, 2017 and December 31, 2016 , deferred implementation costs related to managed service contracts were $536,000 and $432,000 , respectively. Unamortized deferred implementation costs were $482,000 and $318,000 as of December 30, 2017 and December 31, 2016 , respectively, of which $176,000 and $266,000 were included in Other current assets on the Consolidated Balance Sheets as of December 30, 2017 and December 31, 2016 , respectively. As of December 30, 2017 and December 31, 2016, $306,000 and $51,000 , respectively, were included in Other long-term assets on the Consolidated Balance Sheets. Research and Development and Software Development Costs - Software development costs are accounted for in accordance with FASB ASC 985-20, " Software - Costs of Software to Be Sold, Leased, or Marketed " and FASB ASC 350-40, “ Intangibles - Goodwill and Other - Internal-Use Software. ” Capitalization of software development costs for products to be sold to third parties begins upon the establishment of technological feasibility and ceases when the product is available for general release. The Company capitalizes development costs incurred during the period between the establishment of technological feasibility and the release of the final product to customers if such costs are material. In addition, the Company capitalizes software development costs for internal use software that it does not intend to market to third parties but uses to deliver services. The establishment of technological feasibility and the ongoing assessment of recoverability of capitalized software development costs require considerable judgment by management concerning certain external factors including, but not limited to, the date technological feasibility is reached, anticipated future gross revenue, estimated economic life and changes in software and hardware technologies. During fiscal years 2017 and 2016 , $374,000 and $467,000 , respectively, of these costs were expensed as incurred. During fiscal years 2017 and 2016 , $287,000 and $436,000 , respectively, of internal use software development costs were capitalized. Goodwill - The Company accounts for goodwill in accordance with the provisions of FASB ASC 350, " Intangibles-Goodwill and Other. " Goodwill represents the excess of purchase price over the fair value of net assets acquired in business combinations accounted for as purchases. The Company evaluates goodwill for impairment on an annual basis on the last day of the first fiscal month of the fourth fiscal quarter and whenever events or circumstances indicate that these assets may be impaired. The goodwill impairment test involves a two-step process. The Company determines impairment by comparing the net assets of each reporting unit to its respective fair value. In the event a reporting unit's carrying value exceeds its fair value, an indication exists that the reporting unit goodwill may be impaired. In this situation, the Company must determine the implied fair value of goodwill by assigning the reporting unit's fair value to each asset and liability of the reporting unit. The excess of the fair value of the reporting unit over the amounts assigned to its assets and liabilities is the implied fair value of goodwill. An impairment loss is measured by the difference between the goodwill carrying value and the implied fair value. Due to a significant decrease in the Company’s stock price during the second quarter of fiscal 2016, the Company performed the first step of the goodwill impairment test. Based on the results of the first step of the goodwill impairment test, the estimated fair value of the reporting units did not exceed their carrying value and therefore step two of the test was required. Based on the results of the second step of the goodwill impairment test (i.e., applying the income approach and market approach described below, the Company determined, as of July 2, 2016, that the implied fair value of goodwill was less than the carrying value, which resulted in goodwill impairment of $10.8 million , representing all of that goodwill. See Note 4, Goodwill and Intangible Assets, for additional discussion related to goodwill. Fair value of the Company’s reporting units is determined using a combination of the income approach and the market approach. The income approach uses a reporting unit's projection of estimated cash flows discounted using a weighted-average cost of capital analysis that reflects current market conditions. The Company also considers the market approach to valuing its reporting units utilizing revenue and EBITDA multiples. The Company compares the results of its overall enterprise valuation as determined by the combination of the two approaches to the Company’s market capitalization. Significant management judgments related to these approaches include: • Anticipated future cash flows and terminal value for each reporting unit - The income approach to determining fair value relies on the timing and estimates of future cash flows, including an estimate of terminal value. The projections use management's estimates of economic and market conditions over the projected period including growth rates in revenues and estimates of expected changes in operating margins. The Company’s projections of future cash flows are subject to change as actual results are achieved that differ from those anticipated. Because management frequently updates its projections, the Company would expect to identify on a timely basis any significant differences between actual results and recent estimates. • Selection of an appropriate discount rate - The income approach requires the selection of an appropriate discount rate, which is based on a weighted average cost of capital analysis. The discount rate is affected by changes in short-term interest rates and long-term yields as well as variances in the typical capital structure of marketplace participants. The discount rate is determined based on assumptions that would be used by marketplace participants, and for that reason, the capital structure of selected marketplace participants was used in the weighted average cost of capital analysis. It is possible that the discount rate can fluctuate from period to period. • Selection of an appropriate multiple - The market approach requires the selection of an appropriate multiple to apply to revenues or EBITDA based on comparable guideline companies or transaction multiples. It is often difficult to identify companies or transactions with a similar profile in regards to revenue, geographic operations, risk profile and other factors. Intangible Assets - Identifiable intangible assets, resulting from the acquisition of the Farncombe Entities, consist of customer relationships, agreements not to compete, and a trade name. The Company amortizes the identifiable intangible assets over their estimated economic benefit period, from six months to four and one-half years. In accordance with FASB ASC 360, “Property, Plant and Equipment,” the Company uses its best estimates based upon reasonable and supportable assumptions and projections to review for impairment of long-lived assets to be held and used whenever events or changes in circumstances indicate that the carrying amount of its assets might not be recoverable. If the Company was to determine that events and circumstances warrant a change to the estimate of an identifiable intangible asset's remaining useful life, then the remaining carrying amount of the identifiable intangible asset would be amortized prospectively over that revised remaining useful life. Additionally, information resulting from other events and circumstances may indicate that the carrying value of one or more identifiable intangible assets is not recoverable which would result in recognition of an impairment charge. No impairments were identified in any period presented. Income Taxes - The Company recognizes a liability or asset for the deferred tax consequences of temporary differences between the tax basis of assets or liabilities and their reported amounts in the financial statements. A valuation allowance is provided when, in the opinion of management, it is more likely than not that some portion or all of a deferred tax asset will not be realized. The Company records the financial statement effects of an income tax position when it is more likely than not that the position will be sustained on the basis of the technical merits. The Company recognizes the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority. The measurement of any unrecognized tax benefit is based on management’s best judgment. The Company reviews these estimates and makes changes to recorded amounts of uncertain tax positions as facts and circumstances warrant. Foreign Currency Transactions and Translation - Cartesian Ltd., the international operations of Cambridge Strategic Management Group, Inc., Farncombe France SARL, Farncombe Technology Limited, and Farncombe Engineering Services Limited conduct business primarily denominated in their respective local currency, which is their functional currency. Assets and liabilities have been translated to U.S. dollars at the period-end exchange rates. Revenues and expenses have been translated at exchange rates which approximate the average of the rates prevailing during each period. Translation adjustments are reported as a separate component of accumulated other comprehensive loss in the Consolidated Statements of Stockholders' Equity. Accumulated other comprehensive loss resulting from foreign currency translation adjustments totaled $6.7 million and $6.8 million , respectively as of December 30, 2017 and December 31, 2016 , and is included in Total Stockholders’ Equity in the Consolidated Balance Sheets. Assets and liabilities denominated in other than the functional currency of a subsidiary are re-measured at rates of exchange on the balance sheet date. Resulting gains and losses on foreign currency transactions are included in the Company’s results of operations. Realized and unrealized exchange losses included in the results of operations during fiscal 2017 and 2016 were $332,000 and $535,000 , respectively. Derivative Financial Instruments FASB ASC 820, Fair Value Measurements requires bifurcation of certain embedded derivative instruments in certain debt or equity instruments, and measurement at their fair value for accounting purposes. A holder redemption feature embedded in the Company’s note payable requires bifurcation from its host instrument and is accounted for as a freestanding derivative. See Note 3, Strategic Alliance and Investment by Elutions, Inc. and Note 10, Fair Value Measurements, for discussion of this embedded derivative. Share-Based Compensation - The Company accounts for share-based payment awards using the provisions of FASB ASC 718, " Compensation-Stock Compensation ". The Company measures the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The fair value of service-based stock option grants is estimated on the grant date using a Black-Scholes option-pricing model and compensation expense related to stock option grants is recognized on a graded vesting schedule over the vesting period. For stock options containing a market condition, the market conditions are required to be considered when calculating the grant date fair value. FASB ASC 718 requires selection of a valuation technique that best fits the circumstances of an award. In order to reflect the substantive characteristics of the market condition option award, a Monte Carlo simulation valuation model was used to calculate the grant date fair value of such stock options. Expense for the market condition stock options is recognized over the derived service period as determined through the Monte Carlo simulation model. For non-vested, performance-based stock awards, compensation expense is recognized based on management’s expectations with regard to achievement of certain performance and service conditions. The fair value of the awards is determined based on the market value of the underlying stock at the grant date. Expense for the awards ultimately expected to vest is recognized on a straight-line basis over the implied service period of the award. In the event the Company determines it is no longer probable that the minimum performance criteria specified in the restricted stock award agreement will be achieved, previously recognized compensation expense would be reversed in the period such a determination is made. For non-vested, service-based stock awards, compensation is recognized based on achievement of service conditions alone. The fair value of the awards is determined based on the market value of the underlying stock at the grant date. Expense for the awards ultimately expected to vest is recognized on a graded vesting schedule over the vesting period. See Note 5, Share-Based Compensation. Loss Per Share - The Company calculates and presents earnings (loss) per share using a dual presentation of basic and diluted earnings (loss) per share. Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted average number of common shares outstanding for the period. The weighted average number of common shares outstanding excludes treasury shares held by the Company. Diluted earnings (loss) per share is computed in the same manner except that the weighted average number of shares is increased for dilutive securities. In accordance with the provisions of FASB ASC 260, " Earnings per Share, " the Company uses the treasury stock method for calculating the dilutive effect of employee stock options, non-vested shares and warrants. The employee stock options, non-vested shares and warrants will have a dilutive effect under the treasury stock method only when average market value of the underlying Company common stock during the respective period exceeds the assumed proceeds. For share-based payment awards with a performance condition, the Company must first use the guidance on contingently issuable shares in FASB ASC 260-10 to determine whether the awards should be included in the computation of diluted earnings per share for the reporting period. For all non-vested performance-based awards, the Company determines the number of shares, if any, that would be issuable at the end of the reporting period if the end of the reporting period were the end of the contingency period. In applying the treasury stock method, assumed proceeds include the amount, if any, the employee must pay upon exercise, the amount of compensation cost for future services that the Company has not yet recognized, and the amount of tax benefits, if any, that would be credited to additional paid-in capital assuming exercise of the options and the vesting of non-vested shares. For fiscal years 2017 and 2016 , approximately 78,000 and 43,000 shares, respectively, related to outstanding stock options, non-vested shares and warrants that otherwise would have been included in the diluted earnings per share calculation were not included because they would have been anti-dilutive due to the net loss for those periods. Accounts Receivable - The Company has entered into agreements with third-party financial institutions under which it can selectively elect to transfer to the financial institutions accounts receivable with certain of the Company’s largest, international customers on a non-recourse basis. These agreements give the Company optionality to convert outstanding accounts receivable to cash. For transfers of accounts receivable under these agreements that qualify as sales, the Company applies the guidance in ASC 860, “Transfers and Servicing – Sales of Financial Assets”, which requires the derecognition of the carrying value of those accounts receivable in the Consolidated Balance Sheets and recognition of a loss on the sale of an asset in operating expenses in the Consolidated Statements of Operations and Comprehensive Loss. During the fiscal years ended December 30, 2017 and December 31, 2016 , |