THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION These unaudited condensed consolidated financial statements have been prepared following the requirements of the Securities and Exchange Commission (“SEC”), for interim reporting. As permitted under those rules, certain footnotes and other financial information that are normally required by accounting principles generally accepted in the United States of America (“U.S. GAAP”) can be condensed or omitted. The December 31, 2016 condensed consolidated balance sheet was derived from audited financial statements, but does not include all disclosures required by U.S. GAAP. The information included in this quarterly report on Form 10-Q should be read in conjunction with the consolidated financial statements and notes thereto of the Company for the year ended December 31, 2016 which were included in the annual report on Form 10-K filed by the Company on March 27, 2017. In the opinion of management, these condensed consolidated financial statements have been prepared on the same basis as the annual consolidated financial statements and notes thereto of the Company and include all adjustments, consisting only of normal recurring adjustments, considered necessary for the fair presentation of the Company’s financial position and operating results. The results for the three months ended March 31, 2017 are not necessarily indicative of the operating results for the year ending December 31, 2017, or any other interim or future periods.
USE OF ESTIMATES	USE OF ESTIMATES The preparation of financial statements in conformity with 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. On an ongoing basis, the Company evaluates its estimates, including those related to stock-based compensation, investments, the determination of the economic useful life of property and equipment, income taxes and valuation allowances against net deferred tax assets. Management bases its estimates on historical experience or on various other assumptions that it believes to be reasonable under the circumstances. Actual results could differ from those estimates.
PRINCIPLES OF CONSOLIDATION	PRINCIPLES OF CONSOLIDATION The condensed consolidated financial statements include the accounts of Finjan Holdings and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.
REVENUE RECOGNITION	REVENUE RECOGNITION Revenue is recognized when persuasive evidence of an arrangement exists, delivery of the product or service has occurred, all obligations have been performed pursuant to the terms of the agreement, the sales price is fixed or determinable, and collectability is reasonably assured. Revenue from the Company’s cybersecurity business results from grants of licenses to its patented cybersecurity technology and settlements reached from legal enforcement of the Company’s patent right. Revenue is recognized when the arrangement with the licensee has been signed and the license has been delivered and made effective, provided the license fees are fixed or determinable and collectability is reasonably assured. The total amount of the consideration received upon any settlement or judgment is allocated to each element based on the fair value of each element. Elements provided in either settlement agreements or judgments include, the value of a license, legal release and interest. Fair value of licensing agreements and royalty revenues, are recognized as revenues in the condensed consolidated statement of operations. Elements not related to license agreements and royalty revenue in nature will be reflected in other income (expense), net in the condensed consolidated statements of operations. Legal release as part of a settlement agreement is recognized as a separate line item in the condensed consolidated statements of operations when value can be allocated to the legal release. When the Company reaches a settlement with a defendant, no value is allocated to the legal release since the existence of a settlement removes legal standing to bring a claim of infringement, and without a legal claim, the legal release has no economic value. The element that is applicable to interest income will be recorded in other income (expense), net. When settlements or judgments are achieved at discounts to the fair value of a license, the Company allocates the full settlement or judgment, excluding specifically named elements as mentioned above, to the value of the license agreement or royalty revenue under the residual method relative to full license fair value prior to the discount.
FOREIGN CURRENCY	FOREIGN CURRENCY Foreign currency denominated assets and liabilities of foreign subsidiaries, where the local currency is the functional currency, are translated into U.S. dollars using the exchange rates in effect at the balance sheet dates, and income and expenses are translated using average exchange rates during the period. The resulting foreign currency translation adjustments were deemed immaterial for the periods presented. Gains and losses from foreign currency transactions are included in other income (expense), net in the accompanying condensed consolidated statements of operations. Foreign currency transaction gains (losses) were immaterial for the periods presented, and are included as general and administrative expense, in the accompanying condensed consolidated financial statements.
CONCENTRATIONS OF CREDIT RISK	CONCENTRATIONS OF CREDIT RISK The Company maintains substantially all of its cash and cash equivalents in financial institutions located in the United States. At times, the Company’s cash and cash equivalent balances may be uninsured or in deposit accounts that exceed the Federal Deposit Insurance Corporation insurance limits. The Company has not experienced any losses in such accounts.
SERIES A PREFERRED STOCK	SERIES A PREFERRED STOCK The Company accounts for the redemption premium and issuance costs on its Series A Preferred stock by recognizing changes in the redemption value immediately as they occur and adjusting the carrying value of the security to equal the redemption value at the end of each reporting period. This method views the end of the reporting period as if it were also the redemption date for the security.
NET INCOME (LOSS) PER COMMON SHARE	NET INCOME (LOSS) PER COMMON SHARE Basic net income (loss) per common share is based upon the weighted-average number of common shares outstanding.
INCOME TAXES	INCOME TAXES The Company accounts for income taxes pursuant to the asset and liability method which requires deferred income tax assets and liabilities to be computed annually for temporary differences between the financial statement and tax bases of assets and liabilities that will result in taxable or deductible amounts in the future based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized. The income tax provision or benefit is the tax payable or refundable for the period plus or minus the change during the period in deferred tax assets and liabilities.
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS	RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606). This ASU is a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. In August 2015, FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which deferred the effective date of ASU 2014-09 to reporting periods beginning after December 15, 2017, with early adoption permitted for reporting periods beginning after December 15, 2016. Subsequently, FASB issued ASUs in 2016 containing implementation guidance related to ASU 2014-09, including: ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), which is intended to improve the operability and understandability of the implementation guidance on principal versus agent considerations; ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, which is intended to clarify two aspects of Topic 606: identifying performance obligations and the licensing implementation guidance; and ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, which contains certain practical expedients in response to identified implementation issues. The Company expects to adopt this guidance in the first quarter of fiscal 2018 and apply the modified retrospective approach. The Company is evaluating the impact of adopting this new accounting standard on its condensed consolidated financial statements. In February 2016, FASB issued ASU No. 2016-02 “Leases” that requires a lessee to recognize the assets and liabilities that arise from operating leases. A lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. The new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the effect of the standard on its condensed consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”). The standard is intended to simplify several areas of accounting for share-based compensation arrangements, including the income tax impact, classification on the statement of cash flows and forfeitures. ASU 2016-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” ASU No. 2016-15 clarifies and provides specific guidance on eight cash flow classification issues that are not currently addressed by current GAAP and thereby reduce the current diversity in practice. ASU No. 2016-15 is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2017, with early application permitted. This guidance is applicable to the Company's fiscal year beginning January 1, 2018. The Company is currently evaluating the standard to determine the impact of its adoption on the condensed consolidated financial statements. Other recent accounting standards that have been issued or proposed by FASB or other standards-setting bodies that do not require adoption until a future date are not expected to have a material impact on our condensed consolidated financial statements upon adoption.