Significant Estimates and Assumptions	9 Months Ended
Sep. 30, 2014
Significant Estimates and Assumptions [Abstract]
Significant Estimates and Assumptions	Significant Estimates and Assumptions The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of sales and expenses during the reporting periods. As described in the Company's annual report on Form 10-K, the most significant estimates and assumptions by management affect the Company’s revenue recognition, valuation of accounts receivable, valuation of inventory, assumptions used to determine fair value of goodwill and intangible assets, deferred tax assets and related valuation allowance, stock-based compensation, warranty and accounting for contingencies. The Company has reviewed these estimates and determined that these, as well as the additional revenue recognition discussion below, remain the most significant estimates for the three and nine months ended September 30, 2014. Although the Company regularly assesses these estimates, actual results could differ materially from these estimates. Changes in estimates are recorded in the period in which they become known. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances. The Company has accounted for its original $35,600 contract received in June 2012 from the Saudi Arabian National Guard, or SANG, to purchase TACNAV products and services under Accounting Standards Codification (ASC) 605-25, Multiple-Element Arrangements. In May 2014, the Company received a contract modification to the original order for an additional $5,200 for TACNAV products and services. All remaining service obligations under the original contract of approximately $200 and the contract modification of approximately $800 were completed in the third quarter of 2014.

Significant Estimates and Assumptions

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of sales and expenses during the reporting periods. As described in the Company's annual report on Form 10-K, the most significant estimates and assumptions by management affect the Company’s revenue recognition, valuation of accounts receivable, valuation of inventory, assumptions used to determine fair value of goodwill and intangible assets, deferred tax assets and related valuation allowance, stock-based compensation, warranty and accounting for contingencies. The Company has reviewed these estimates and determined that these, as well as the additional revenue recognition discussion below, remain the most significant estimates for the three and nine months ended September 30, 2014.

Although the Company regularly assesses these estimates, actual results could differ materially from these estimates. Changes in estimates are recorded in the period in which they become known. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances.

The Company has accounted for its original $35,600 contract received in June 2012 from the Saudi Arabian National Guard, or SANG, to purchase TACNAV products and services under Accounting Standards Codification (ASC) 605-25, Multiple-Element Arrangements. In May 2014, the Company received a contract modification to the original order for an additional $5,200 for TACNAV products and services. All remaining service obligations under the original contract of approximately $200 and the contract modification of approximately $800 were completed in the third quarter of 2014.