Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The information as of September 30, 2018 and for the three and nine months ended September 30, 2018 and October 1, 2017 is unaudited. The condensed consolidated balance sheet as of December 31, 2017 was derived from the Company’s audited consolidated financial statements at that date. In the opinion of management, these unaudited condensed consolidated financial statements include all adjustments, consisting of normal recurring adjustments necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the interim periods presented. The results have been prepared in accordance with the instructions to Form 10-Q and do not necessarily include all information and footnotes necessary for presentation in accordance with accounting principles generally accepted in the U.S. (“GAAP”). These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the related notes included in the Company’s audited annual consolidated financial statements for the fiscal year ended December 31, 2017, included in the Company’s Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission on February 28, 2018 (the “Form 10-K”). Interim operating results are not necessarily indicative of operating results expected in subsequent periods or for the year as a whole. As discussed in “Discontinued Operations” in Note 3, these condensed consolidated financial statements have been recast for all periods presented to reflect the disposition of the Company’s Public Safety & Security business unit. Accordingly, PSS (as defined below) and its subsidiaries have been reported in discontinued operations in the condensed consolidated financial statements for all periods presented.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its 100% owned subsidiaries for which all inter-company transactions have been eliminated in consolidation.
Fiscal Year	Fiscal Year The Company has a 52/53 week fiscal year ending on the last Sunday of the calendar year. The three month periods ended September 30, 2018 and October 1, 2017 consisted of a 13-week period and a 14-week periods respectively. The nine month periods ended September 30, 2018 and October 1, 2017 consisted of a 39-week period and a 40-week period, respectively. There are 52 calendar weeks in the fiscal year ending on December 30, 2018 and 53 calendar weeks in the fiscal year ending on December 31, 2017.
Accounting Estimates	Accounting Estimates There have been no significant changes in the Company’s accounting estimates for the three and nine months ended September 30, 2018 as compared to the accounting estimates described in the Form 10-K.
Accounting Standards Updates	Accounting Standards Updates In November 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-18 (“ASU 2016-18”), Statement of Cash Flows (Topic 230) - Restricted Cash, which requires that restricted cash and cash equivalents be included with cash and cash equivalents when reconciling beginning-of-period and end-of-period total amounts shown on the consolidated statements of cash flows. ASU 2016-18 is effective for public entities for fiscal years beginning after December 15, 2017 and for interim periods therein. The Company adopted ASU 2016-18 as of January 1, 2018. The adoption of the ASU 2016-18 did not have a material impact on the Company’s consolidated financial statements. In August 2016, the FASB issued ASU 2016-15 (“ASU 2016-15”), Classification of Certain Cash Receipts and Cash Payments. ASU 2016-15 is designed to clarify how entities should classify cash receipts and cash payments in the statement of cash flows. ASU 2016-15 became effective for the Company beginning January 1, 2018. The standard requires retrospective application. The adoption of the ASU 2016-15 did not have a material impact on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02 (“ASU 2016-02”), Leases. ASU 2016-02 requires that lessees recognize assets and liabilities for the rights and obligations underlying leases with a lease term of more than one year. The amendments in this ASU are effective for annual periods beginning after December 15, 2018. In July 2018, the FASB issued ASU 2018-11, which, among other things, allows a company to elect an optional transition method that applies the new lease requirements through a cumulative-effect adjustment in the period of adoption. The Company expects to adopt the standard on December 31, 2018 using the optional transition method. The Company is currently identifying and implementing appropriate changes to its policies, business processes, systems and controls to support lease accounting and disclosures under ASU 2016-02. The majority of the Company’s existing lease arrangements are classified as operating leases, which the Company expects will continue to be classified as operating under the new standard. The Company does not expect the impact on the results of operations and cash flows after adoption to be material. Effective January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers, as amended (Topic 606) (“ASC 606”), which establishes a broad principle that requires entities to assess the products or services promised in contracts with customers at contract inception to determine the appropriate unit at which to record revenues, which is referred to as a performance obligation. Revenue is recognized when control of the promised products or services is transferred to customers, at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those products or services. The new standard supersedes GAAP guidance on revenue recognition and requires the use of more estimates and judgments than the present standards. In addition, the standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. ASC 606 may be applied either retrospectively or through the use of a modified-retrospective method. The full retrospective method requires companies to recast each prior reporting period presented as if the new guidance had always existed. Under the modified retrospective method, companies would recognize the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings at the date of initial application. The Company adopted the new revenue standard through the use of the modified-retrospective method. The cumulative effects of applying the new guidance to all contracts with customers that were not completed as of January 1, 2018 was recorded as a decrease in opening equity of $0.2 million. Additional disclosures have been included in Note 2 in accordance with the ASU.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying amounts and the related estimated fair values of the Company’s long-term debt financial instruments not measured at fair value on a recurring basis at September 30, 2018 and December 31, 2017 are presented in Note 9. The carrying value of all other financial instruments, including cash equivalents, accounts receivable, unbilled receivables, accounts payable, accrued expenses, billings in excess of cost and earnings on uncompleted contracts, income taxes payable and short-term debt, approximated their estimated fair values at September 30, 2018 and December 31, 2017 due to the short-term nature of these instruments.
Net Loss per Common Share	Net Loss per Common Share The Company calculates net loss per share in accordance with FASB ASC Topic 260, Earnings per Share (“Topic 260”). Under Topic 260, basic net loss per common share is calculated by dividing net loss by the weighted-average number of common shares outstanding during the reporting period. Diluted net loss per common share reflects the effects of potentially dilutive securities.