GTT Communications (GTTNQ) 10-K 13 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Mar. 13, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	GTT Communications, Inc.
Entity Central Index Key	1315255
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Trading Symbol	gtt
Entity Common Stock, Shares Outstanding		34,007,983
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2014
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$183,342,889

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS
Cash and cash equivalents	$49,256	$5,785
Accounts receivable, net of allowances of $702 and $748, respectively	29,328	22,305
Deferred contract costs	2,351	1,975
Prepaid expenses and other current assets	3,913	2,878
Total current assets	84,848	32,943
Property and equipment, net	25,184	20,450
Intangible assets, net	58,630	43,618
Other assets	7,933	7,726
Goodwill	92,683	67,019
Total assets	269,278	171,756
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	20,336	20,983
Accrued expenses and other current liabilities	35,464	26,999
Short-term debt	6,188	6,500
Deferred revenue	8,340	6,797
Total current liabilities	70,328	61,279
Long-term debt	117,438	85,960
Warrant liability	0	12,295
Deferred revenue	766	1,480
Other long-term liabilities	3,180	1,232
Total liabilities	191,712	162,246
Commitments and contingencies
Stockholders' equity:
Common stock, par value $.0001 per share, 80,000,000 shares authorized, 23,311,023, and 19,129,765 shares issued and outstanding as of December 31, 2013 and 2012, respectively	3	2
Additional paid-in capital	167,678	76,014
Accumulated deficit	-89,205	-66,226
Accumulated other comprehensive loss	-910	-280
Total stockholders' equity	77,566	9,510
Total liabilities and stockholders' equity	$269,278	$171,756

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable, current (in dollars)	$878	$702
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares, issued	33,848,543	23,311,023
Common stock, shares, outstanding	33,848,543	23,311,023

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Telecommunications services	$207,343	$157,368
Operating expenses:
Cost of telecommunications services	128,086	102,815
Selling, general and administrative expense	45,613	31,675
Restructuring costs, employee termination and other items	9,425	7,677
Depreciation and amortization	24,921	17,157
Total operating expenses	208,045	159,324
Operating loss	-702	-1,956
Other expense:
Interest expense, net	-8,454	-8,408
Loss on debt extinguishment	-3,104	-706
Other expense, net	-8,636	-11,724
Total other expense	-20,194	-20,838
Loss before income taxes	-20,896	-22,794
Income tax expense (benefit)	2,083	-2,005
Net loss	($22,979)	($20,789)
Loss per share:
Basic (in dollars per share)	($0.85)	($0.95)
Diluted (in dollars per share)	($0.85)	($0.95)
Weighted average shares:
Basic (in shares)	27,011,381	21,985,241
Diluted (in shares)	27,011,381	21,985,241

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	($22,979)	($20,789)
Other comprehensive income (loss):
Foreign currency translation (loss) gain	-630	453
Comprehensive loss	($23,609)	($20,336)

Consolidated_Statement_of_Stoc

Consolidated Statement of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
In Thousands, except Share data, unless otherwise specified
Balance at Dec. 31, 2012	$17,039	$2	$63,207	($45,437)	($733)
Balance (in shares) at Dec. 31, 2012		19,129,765
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation for options issued	363		363
Share-based compensation for restricted stock issued	1,103		1,103
Share-based compensation for restricted stock issued (in shares)		722,357
Tax witholding related to the vesting of restricted stock units	-120		-120
Tax witholding related to the vesting of restricted stock units (in shares)		-32,297
Shares issued in connection with acquisition earn-out	1,650		1,650
Shares issued in connection with acquisition earn-out (in shares)		356,122
Shares issued in connection with acquisitions	0
Cashless exercise of warrants	0
Stock issued in private offering	6,182		6,182
Stock issued in private offering (in shares)		2,060,595
Stock options exercised	43		43
Stock options exercised (in shares)	92,125	92,125
Stock issued on debt extinguishment	3,586		3,586
Stock issued on debt extinguishment (in shares)		982,356
Net loss	-20,789			-20,789
Foreign currency translation	453
Balance at Dec. 31, 2013	9,510	2	76,014	-66,226	-280
Balance (in shares) at Dec. 31, 2013		23,311,023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation for options issued	883		883
Share-based compensation for restricted stock issued	1,535		1,535
Share-based compensation for restricted stock issued (in shares)		1,030,482
Tax witholding related to the vesting of restricted stock units	-1,591		-1,591
Tax witholding related to the vesting of restricted stock units (in shares)		-147,025
Shares issued in connection with acquisition earn-out	3,704		3,704
Shares issued in connection with acquisition earn-out (in shares)		306,122
Shares issued in connection with acquisitions	3,884		3,884
Shares issued in connection with acquisitions (in shares)		325,438
Cashless exercise of warrants	9,576		9,576
Cashless exercise of warrants (in shares)		913,749
Stock issued in private offering	72,680	1	72,679
Stock issued in private offering (in shares)		7,475,000
Stock options exercised	994		994
Stock options exercised (in shares)	633,754	633,754
Net loss	-22,979			-22,979
Foreign currency translation	-630
Balance at Dec. 31, 2014	$77,566	$3	$167,678	($89,205)	($910)
Balance (in shares) at Dec. 31, 2014		33,848,543

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net loss	($22,979)	($20,789)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	24,921	17,157
Shared-based compensation	2,418	1,466
Debt discount amortization	420	601
Change in fair value of warrant liability	6,857	8,658
Loss on debt extinguishment	3,104	706
Change in fair value of nLayer earn-out	1,554	1,978
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable, net	-4,965	485
Deferred contract costs	251	-619
Prepaid expenses and other current assets	-804	5,252
Other assets	-2,795	-4,533
Accounts payable	-14,235	604
Accrued expenses and other current liabilities	-5,063	-6,987
Deferred revenue and other long-term liabilities	1,189	-1,300
Net cash provided by operating activities	-10,127	2,679
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	-37,488	-51,884
Purchases of customer lists	-206	-4,042
Purchases of property and equipment	-5,819	-4,053
Net cash used in investing activities	-43,513	-59,979
Cash flows from financing activities:
Repayment of promissory note	0	-237
Proceeds from line of credit	3,000	3,000
Repayment of line of credit	-6,000	0
Proceeds from term loan	125,000	65,794
Repayment of term loan	-63,124	-28,544
Proceeds from mezzanine debt	1,500	11,651
Repayment of mezzanine debt	-31,000	0
Repayment of warrant liability	-9,576	0
Repayment of subordinate notes payable	0	-85
Tax withholding related to the vesting of restricted stock units	-1,591	-120
Exercise of stock options	994	43
Stock issued in private offering	72,680	6,182
Net cash provided by financing activities	91,883	57,684
Effect of exchange rate changes on cash	5,228	675
Net increase in cash and cash equivalents	43,471	1,059
Cash and cash equivalents at beginning of year	5,785	4,726
Cash and cash equivalents at end of year	49,256	5,785
Supplemental disclosure of cash flow information:
Cash paid for interest	7,976	7,412
Supplemental disclosure of non-cash investing and financing activities:
Fair value of assets acquired	43,919	64,092
Fair value of liabilities acquired	20,284	36,152
Shares issued in connection with the extinguishment of subordinated notes and accrued interest thereon	0	2,880
Shares issued in connection with acquisition earn-out	3,704	1,650
Shares issued in connection with acquisitions	3,884	0
Cashless exercise of warrants	$9,576	$0

SUBSEQUENT_EVENT_SUBSEQUENT_EV

SUBSEQUENT EVENT SUBSEQUENT EVENT (MegaPath's Managed Services, Subsequent Event, USD $)	0 Months Ended
In Thousands, except Share data, unless otherwise specified	Feb. 19, 2015
MegaPath's Managed Services | Subsequent Event
Subsequent Event [Line Items]
Cash consideration to be paid for business acquisition	$144,800
Total stock consideration	610,843

ORGANIZATION_AND_BUSINESS

ORGANIZATION AND BUSINESS	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION AND BUSINESS	ORGANIZATION AND BUSINESS
	Organization and Business
	GTT is a Delaware corporation which was incorporated on January 3, 2005. GTT operates a global Tier 1 IP network connecting clients to locations and cloud applications around the world. We seek to further extend our network globally while delivering exceptional client service with simplicity, speed and agility.

SIGNIFICANT_ACCOUNTING_POLICIE

SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation of Consolidated Financial Statements and Use of Estimates
	The consolidated financial statements include the accounts of the Company and it's wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation.
	The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America ("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 consolidated financial statements, and the reported amounts of revenue and expenses during the reporting period. Significant accounting estimates to be made by management include allowances for doubtful accounts, valuation of goodwill and other long-lived assets, accrual for billing disputes, and valuation of equity instruments. Because of the uncertainty inherent in such estimates, actual results may differ from these estimates.
	Segment Reporting
	The Company reports operating results and financial data in one operating and reportable segment. The Company manages its business as a single profit center in order to promote collaboration, provide comprehensive service offerings across its entire customer base, and provide incentives to employees based on the success of the organization as a whole. Although certain information regarding geographic markets and selected products or services are discussed for purposes of promoting an understanding of the Company's complex business, the Company manages its business and allocates resources at the consolidated level of a single operating segment.
	Revenue Recognition
	We deliver three primary services to our customers—EtherCloud, our flexible Ethernet-based connectivity service; Internet Services, our reliable, high bandwidth internet connectivity services; and Managed Services, our provision of fully managed network services so organizations can focus on their core business. Our extensive network and broad geographic reach enable us to cost-effectively deliver the bandwidth, scale and security demanded by our customers. Certain of the Company’s current revenue activities have features that may be considered multiple elements. The Company believes that there is insufficient evidence to determine each element’s fair value and as a result, in those arrangements where there are multiple elements, revenue is recorded ratably over the term of the arrangement.
	Network Services and Support.   The Company’s services are provided pursuant to contracts that typically provide for payments of recurring charges on a monthly basis for use of the services over a committed term. Each service contract has a fixed monthly cost and a fixed term, in addition to a fixed installation charge (if applicable). At the end of the initial term of most service contracts, the contracts roll forward on a month-to-month or other periodic basis and continue to bill at the same fixed recurring rate. If any cancellation or termination charges become due from the customer as a result of early cancellation or termination of a service contract, those amounts are calculated pursuant to a formula specified in each contract. Recurring costs relating to supply contracts are recognized ratably over the term of the contract.
	Non-recurring Fees, Deferred Revenue.  Non-recurring fees for data connectivity typically take the form of one-time, non-refundable provisioning fees established pursuant to service contracts. The amount of the provisioning fee included in each contract is generally determined by marking up or passing through the corresponding charge from the Company’s supplier, imposed pursuant to the Company’s purchase agreement. Non-recurring revenue earned for providing provisioning services in connection with the delivery of recurring communications services is recognized ratably over the contractual term of the recurring service starting upon commencement of the service contract term. Fees recorded or billed from these provisioning services are initially recorded as deferred revenue then recognized ratably over the contractual term of the recurring service. Installation costs related to provisioning incurred by the Company from independent third party suppliers, directly attributable and necessary to fulfill a particular service contract, and which costs would not have been incurred but for the occurrence of that service contract, are recorded as deferred contract costs and expensed proportionally over the contractual term of service in the same manner as the deferred revenue arising from that contract. Deferred costs do not exceed deferred upfront fees. Based on operating activity, the Company believes the initial contractual term is the best estimate of the period of earnings.
	Other Revenue.   From time to time, the Company recognizes revenue in the form of fixed or determinable cancellation (pre-installation) or termination (post-installation) charges imposed pursuant to the service contract. This revenue is earned when a customer cancels or terminates a service agreement prior to the end of its committed term. This revenue is recognized when billed if collectability is reasonably assured. In addition, the Company from time to time sells equipment in connection with data networking applications. The Company recognizes revenue from the sale of equipment at the contracted selling price when title to the equipment passes to the customer (generally F.O.B. origin) and when collectability is reasonably assured.
	Universal Service Fund (USF), Gross Receipts Taxes and Other Surcharges
	The Company is liable in certain cases for collecting regulatory fees and/or certain sales taxes from its customers and remitting the fees and taxes to the applicable governing authorities. The Company records taxes applicable on a net basis.
	Translation of Foreign Currencies
	These consolidated financial statements have been reported in U.S. Dollars by translating asset and liability amounts of foreign subsidiaries at the closing exchange rate, equity amounts at historical rates, and the results of operations and cash flow at the average exchange rate prevailing during the periods reported.
	A summary of exchange rates used is as follows:
		U.S. Dollar / British Pounds Sterling				U.S. Dollar / Euro
		2014		2013		2014		2013
	Closing exchange rate at December 31	1.55		1.65		1.22		1.38
	Average exchange rate during the period	1.65		1.56		1.33		1.33
	Transactions denominated in foreign currencies are recorded at the rates of exchange prevailing at the time of the transaction. Monetary assets and liabilities denominated in foreign currencies are translated at the rate of exchange prevailing at the balance sheet date. Exchange differences arising upon settlement of a transaction are reported in the consolidated statements of operations in other expense.
	Other Expense, Net
	The Company recognized other expense, net, of $8.6 million and $11.7 million for the years ended December 31, 2014 and 2013, respectively. The following table presents other expense, net by type:
		2014				2013
	Change in fair value of warrant liability	$	6,857			$	8,658
	Change in fair value of acquisition earn-outs	1,554				1,978
	Other	225				1,088
		$	8,636			$	11,724
	Accounts Receivable, Net
	Accounts receivable balances are stated at amounts due from the customer net of an allowance for doubtful accounts. Credit extended is based on an evaluation of the customer’s financial condition and is granted to qualified customers on an unsecured basis.
	The Company, pursuant to its standard service contracts, is entitled to impose a finance charge of a certain percentage per month with respect to all amounts that are past due. The Company’s standard terms require payment within 30 days of the date of the invoice. The Company treats invoices as past due when they remain unpaid, in whole or in part, beyond the payment time set forth in the applicable service contract.
	The Company determines its allowance for doubtful accounts by considering a number of factors, including the length of time trade receivables are past due, the customer’s current ability to pay its obligation to the Company, and the condition of the general economy and the industry as a whole. Specific reserves are also established on a case-by-case basis by management. The Company writes off accounts receivable when they become uncollectible. Credit losses have historically been within management’s expectations. Actual bad debts, when determined, reduce the allowance, the adequacy of which management then reassesses. The Company writes off accounts after a determination by management that the amounts at issue are no longer likely to be collected, following the exercise of reasonable collection efforts, and upon management’s determination that the costs of pursuing collection outweigh the likelihood of recovery. The total allowance for doubtful accounts was $0.9 million and $0.7 million as of December 31, 2014 and 2013, respectively.
	Other Comprehensive Loss
	In addition to net loss, comprehensive loss includes charges or credits to equity occurring other than as a result of transactions with stockholders. For the Company, this consists of foreign currency translation adjustments.
	Share-Based Compensation
	Share-based compensation expense recognized in the Company’s consolidated statements of operations for the years ended December 31, 2014 and 2013, included compensation expense for share-based payment awards based on the grant date fair value with the expense recognized on a straight-line over the requisite service period.
	The Company uses the Black-Scholes option-pricing model to determine the fair value of its awards at the time of grant.
	Cash and Cash Equivalents
	Included in cash and cash equivalents are deposits with financial institutions as well as short-term money market instruments, certificates of deposit and debt instruments with maturities of three months or less when purchased.
	Accounting for Derivative Instruments
	Derivative instruments are recorded in the consolidated balance sheet as either assets or liabilities, measured at fair value. The Company issued warrants to the Mezzanine Note Holders which have been recorded as a liability with the fair value of the liability being remeasured on a quarterly basis. As of December 31, 2014, the warrant liability has been extinguished in full. The warrant liability was extinguished in August 2014 in connection with the refinancing transaction described in Note 5. Through the date of the extinguishment, the warrant liability was marked to market which resulted in a loss of $6.9 million in 2014. The balance of the warrant liability immediately before the extinguishment was $19.2 million. As of December 31, 2013, the warrant liability was marked to market which resulted in a loss of $8.7 million in 2013. The balance of the warrant liability was $12.3 million at December 31, 2013. See Note 5 for additional information.
	Income Taxes
	The Company provides for income taxes as a "C" corporation on income earned from operations. The Company is subject to federal, state, and foreign taxation in various jurisdictions.
	Deferred tax assets and liabilities are recorded to recognize the expected future tax benefits or costs of events that have been, or will be, reported in different years for financial statement purposes than for tax purposes. Deferred tax assets and liabilities are computed based on the difference between the financial statement carrying amount and tax basis of assets and liabilities using enacted tax rates and laws for the years in which these items are expected to reverse. If management determines that some portion or all of a deferred tax asset is not “more likely than not” to be realized, a valuation allowance is recorded as a component of the income tax provision to reduce the deferred tax asset to an appropriate level in that period. In determining the need for a valuation allowance, management considers all positive and negative evidence, including historical earnings, projected future taxable income, future reversals of existing taxable temporary differences, taxable income in prior carryback periods, and prudent, feasible tax-planning strategies.
	The Company may, from time to time, be assessed interest and/or penalties by taxing jurisdictions, although any such assessments historically have been minimal and immaterial to its financial results. The Company’s federal, state and international tax returns for 2011, 2012, 2013 and 2014 are still open. In the event the Company has received an assessment for interest and/or penalties, it has been classified in the consolidated statements of operations as other general and administrative costs.
	Net Loss Per Share
	Basic loss per share is computed by dividing net loss available to common stockholders by the weighted average number of common shares outstanding. Diluted earnings per share reflect, in periods with earnings and in which they have a dilutive effect, the effect of common shares issuable upon exercise of stock options and warrants.
	The table below details the calculations of earnings per share (in thousands, except for share and per share amounts):
		Year Ended December 31,
		2014				2013
	Numerator for basic and diluted EPS – loss available to common stockholders	$	(22,979	)		$	(20,789	)
	Denominator for basic EPS – weighted average shares	27,011,381				21,985,241
	Effect of dilutive securities	—				—
	Denominator for diluted EPS – weighted average shares	27,011,381				21,985,241
	Loss per share: basic	$	(0.85	)		$	(0.95	)
	Loss per share: diluted	$	(0.85	)		$	(0.95	)
	The table below details the anti-dilutive common share items that were excluded in the computation of earnings per share (amounts in thousands):
		Year Ended December 31,
		2014			2013
	BIA warrant	—			1,055
	Plexus warrant	—			960
	Alcentra warrant	—			329
	Stock options	1,363			1,698
	Totals	1,363			4,042
Software Capitalization
Software development costs include costs to develop software programs to be used solely to meet our internal needs and cloud based applications used to deliver our services. The Company capitalizes development costs related to these software applications once the preliminary project stage is complete and it is probable that the project will be completed and the software will be used to perform the function intended. Costs capitalized for developing such software applications were not material for the periods presented.
Property and Equipment
Property and equipment are stated at cost, net of accumulated depreciation computed using the straight-line method. Depreciation on these assets is computed over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the term of the lease, excluding optional extensions, or the useful life. Depreciable lives used by the Company for its classes of assets are as follows:
Furniture and Fixtures	7 years
Network Equipment	5 years
Leasehold Improvements	up to 10 years
Computer Hardware and Software	3-5 years
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 the assets may not be recoverable. If the carrying amount of an asset exceeds its estimated future undiscounted cash flows, the asset is considered to be impaired. Impairment losses are measured as the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell.
Goodwill and Intangible Assets
The Company assesses goodwill for impairment on at least an annual basis on October 1 unless interim indicators of impairment exist. Goodwill is considered to be impaired when the net book value of a reporting unit exceeds its estimated fair value. The Company operates as a single operating segment and as a single reporting unit for the purpose of evaluating goodwill. As of October 1, 2014, the Company performed its annual impairment test of goodwill by comparing the fair value of the Company (primarily based on market capitalization) to the carrying value of equity, and concluded that the fair value of the reporting unit was greater than the carrying amount. During the fiscal years ended December  31, 2014, and 2013 the Company did not record any goodwill impairment.
Intangible assets consist of customer relationships, restrictive covenants related to employment agreements, license fees and a trade name. Customer relationships and restrictive covenants related to employment agreements are amortized, on a straight-line basis, over periods of up to seven years. Point-to-point FCC Licenses are accounted for as definite lived intangibles and amortized over the average remaining useful life of such licenses which approximates three years. The trade name is not amortized, but is tested on at least an annual basis as of October 1 unless interim indicators of impairment exist. The trade name is considered to be impaired when the net book value exceeds its estimated fair value. As of October 1, 2014 the Company performed its annual impairment test of the trade name, and concluded that the fair value of the trade name was greater than the carrying amount. The Company used the relief from royalty method for valuation. The fair value of the asset is the present value of the license fees avoided by owning the asset, or the royalty savings.
Business Combinations
The Company includes the results of operations of the businesses that it acquires as of the respective dates of acquisition. The Company allocates the fair value of the purchase price of its acquisitions to the assets acquired and liabilities assumed based on their estimated fair values. The excess of the fair value of the purchase price over the fair values of these identifiable assets and liabilities is recorded as goodwill.
Concentrations of Credit Risk
Financial instruments potentially subjecting the Company to a significant concentration of credit risk consist primarily of cash and cash equivalents. At times during the periods presented, the Company had funds in excess of $250,000 insured by the U.S. Federal Deposit Insurance Corporation, or in excess of similar Deposit Insurance programs outside of the United States, on deposit at various financial institutions. As of December 31, 2014, approximately $45.2 million of the Company’s deposits were held at institutions as balances in excess of the U.S. Federal Deposit Insurance Corporation and international insured deposit limits for those institutions. However, management believes the Company is not exposed to significant credit risk due to the financial position of the depository institutions in which those deposits are held.
The Company's trade receivables, which are unsecured, are geographically dispersed. No customers' trade receivable balance as of December 31, 2014 and 2013 exceeded 10% of the Company's consolidated accounts receivable, net.
For the years ended December 31, 2014 and 2013, no single customer exceeded 10% of total consolidated revenue.
Fair Value of Financial Instruments
The Company accounts for fair value measurements in accordance with the fair value accounting standard as it relates to financial assets and financial liabilities. The Company establishes a fair value hierarchy that distinguishes between (1) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (2) an entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs).
The fair value hierarchy consists of three broad levels, which prioritizes the inputs used in measuring fair value as follows: observable inputs such as quoted prices in active markets (Level 1); inputs other than quoted prices in active markets that are observable either directly or indirectly (Level 2); and unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions (Level 3).
The carrying amounts of cash equivalents, receivables, accounts payable, and accrued expenses approximate fair value due to the immediate or short-term maturity of these financial instruments. The fair value of notes payable is determined using current applicable rates for similar instruments as of the consolidated balance sheet date and approximates the carrying value of such debt.
Accrued Carrier Expenses
The Company accrues estimated charges owed to its suppliers for services. The Company bases this accrual on the supplier contract, the individual service order executed with the supplier for that service, the length of time the service has been active, and the overall supplier relationship.
Disputed Carrier Expenses
It is common in the telecommunications industry for users and suppliers to engage in disputes over amounts billed (or not billed) in error or over interpretation of contract terms. The disputed carrier cost included in the consolidated financial statements includes disputed but unresolved amounts claimed as due by suppliers, unless management is confident, based upon its experience and its review of the relevant facts and contract terms, that the outcome of the dispute will not result in liability for the Company. Management estimates this liability and reconciles the estimates with actual results as disputes are resolved, or as the appropriate statute of limitations with respect to a given dispute expires.
For the year ended December 31, 2014, open disputes totaled approximately $6.9 million. Based upon its experience with each vendor and similar disputes in the past, and based upon management review of the facts and contract terms applicable to each dispute, management has determined that the most likely outcome is that the Company will be liable for approximately $2.1 million in connection with these disputes as of December 31, 2014. As of December 31, 2013, open disputes totaled approximately $7.3 million and the Company determined the liability from these disputes to be $2.3 million.
Recent Accounting Pronouncements
On May 28, 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Codification ("ASC") 606, Revenue From Contracts With Customers. The guidance in ASC 606 supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific guidance throughout the Industry Topics of the Codification. ASC 606 states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company is assessing the impact of ASC 606 and will adopt the guidance for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016.
On August 27, 2014, the FASB issued an Accounting Standard Update ("ASU") 2014-15, Disclosure of Uncertainties About an Entity's Ability to Continue as a Going Concern, which provides guidance on determining when and how reporting entities must disclose going-concern uncertainties in their financial statements. The new standard requires management to perform interim and annual assessments of an entity's ability to continue as a going concern within one year of the date of issuance of the entity's financial statements (or within one year after the date on which the financial statements are available to be issued, when applicable). Further, an entity must provide certain disclosures if there is "substantial doubt about the entity's ability to continue as a going concern". The impact of adopting this guidance on January 1, 2017 is not expected to have a material impact on the Company's consolidated financial statements.

ACQUISITIONS

ACQUISITIONS	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS
	Acquisitions have been recorded using the acquisition method of accounting and accordingly, results of their operations have been included in the Company's consolidated financial statements since the effective date of each respective acquisition.
	2014
	UNSi
	On October 1, 2014, the Company acquired 100% of the issued and outstanding stock in United Networks Services, Inc. ("UNSi"), a Delaware corporation. UNSi delivers high capacity Ethernet and MPLS wide-area-network solutions, internet services and a broad range of managed services. The Company paid the shareholders of UNSi an aggregate of $35.4 million, payable in a combination of cash and 231,539 shares of common stock of the Company.  $2.6 million of the purchase price is being withheld by the Company for one year following the closing of the acquisition as security for UNSi's indemnification obligations under the Merger Agreement.
	The Company accounted for the acquisition using the acquisition method of accounting with GTT treated as the acquiring entity. Accordingly, consideration paid by the Company to complete the acquisition of UNSi has been preliminarily allocated to UNSi's assets and liabilities based upon their estimated fair values as of the date of completion of the acquisition, October 1, 2014. The recorded amounts for acquired assets and liabilities assumed are provisional and subject to change. The Company will finalize the amounts recognized as it obtains the information necessary to complete the analysis. In accordance with US GAAP, the Company expects to finalize these amounts before October 1, 2015. The following table summarizes the purchase price and the preliminary allocation of assets acquired and liabilities assumed as of the acquisition date at estimated fair value:
		Amounts in thousands
	Purchase Price:
	Total cash consideration	$	29,978
	Total holdback	2,568
	Total stock consideration	2,884
	Fair value of liabilities assumed	16,052
	Total consideration	$	51,482
	Purchase Price Allocation:
	Acquired Assets
	Current assets	$	4,292
	Property and equipment	8,181
	Intangible assets	17,605
	Total fair value of assets acquired	30,078
	Goodwill	21,404
	Total consideration	$	51,482
	Intangible assets acquired include $15.9 million related to customer relationships with a weighted-average useful life of five years and $1.7 million related to point-to-point FCC licenses with a useful life of three years. The customer relationships and license fees are amortized on a straight-line basis based on the expected period of benefit.
	Amortization expense of $0.8 million has been recorded for the year ended December 31, 2014. Estimated amortization expense related to intangible assets created as a result of the UNSi acquisition for each of the years subsequent to December 31, 2014, is as follows (amounts in thousands):
	2015	$	3,914
	2016	3,743
	2017	3,604
	2018	3,188
	2019	2,391
	Total	$	16,840
	Goodwill in the amount of $21.4 million was recorded as a result of the acquisition of UNSi. Goodwill is calculated as the excess of the consideration transferred over the net assets recognized and represents the estimated future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Substantially all of the goodwill is deducible for tax purposes.
	The following schedule presents unaudited consolidated pro forma results of operations as if the UNSi acquisition had occurred on January 1, 2013. This information does not purport to be indicative of the actual results that would have occurred if the UNSi acquisition had actually been completed on January 1, 2013, nor is it necessarily indicative of the future operating results or the financial position of the combined company. The unaudited pro forma results of operations do not reflect the cost of any integration activities or benefits that may result from synergies that may be derived from any integration activities.
		Year Ended December 31,
		2014			2013
	Amounts in thousands, except per share and share data
	Revenue	$	252,642		$	206,811
	Net loss	$	(31,639	)	$	(33,829	)
	Net loss per share:
	Basic	$	(1.17	)	$	(1.54	)
	Diluted	$	(1.17	)	$	(1.54	)
	Basic	27,011,381			21,985,241
	Diluted	27,011,381			21,985,241
	2013
	IDC
	On February 1, 2013, the Company entered into a stock purchase agreement with IDC Global Incorporated ("IDC"), a privately held company in Chicago. IDC owns and operates two data center facilities and its own metro optical fiber network in Chicago. The two data center facilities' fiber connects to 350 East Cermak, which is the largest multi-story data center property in the world. IDC provides cloud networking, co-location, and managed cloud services with a focus on providing multi-location enterprises with a complete portfolio of cloud infrastructure services.
	Pursuant to the agreement, the Company acquired 100% of the issued and outstanding shares of capital stock of IDC for cash consideration paid of $3.6 million. The Company estimated the fair value of IDC’s assets and liabilities based on discussions with IDC’s management, due diligence and information presented in financial statements. The following table summarizes the purchase price and the assets acquired and liabilities assumed as of the acquisition date at estimated fair value:
		Amounts in
		thousands
	Purchase Price:
	Cash consideration paid	$	3,593
	Fair value of liabilities assumed	1,338
	Total consideration	$	4,931
	Purchase Price Allocation:
	Acquired Assets
	Current assets	$	187
	Property and equipment	798
	Other assets	82
	Intangible assets	3,100
	Total fair value of assets acquired	4,167
	Goodwill	764
	Total consideration	$	4,931
	Intangible assets acquired include $3.1 million related to customer relationships with a weighted-average useful life of 5 years. Customer relationships are amortized on a straight-line basis based on the expected period of benefit.
	Goodwill in the amount of $0.8 million was recorded as a result of the acquisition of IDC. Goodwill is calculated as the excess of the consideration transferred over the net assets recognized and represents the estimated future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. The goodwill is deductible for tax purposes.
	Tinet
	On April 30, 2013, the Company acquired from Neutral Tandem, Inc. (doing business as Inteliquent) all of the equity interests (the “Interests”) in NT Network Services, LLC and NT Network Services, LLC SCS (collectively, “Tinet”), which, together with the subsidiaries of such companies, comprise the data transport business of Inteliquent.  The acquisition was pursuant to an equity purchase agreement between the Company and Inteliquent on April 30, 2013.
Pursuant to the agreement, the Company paid Inteliquent cash consideration of $49.2 million for the Interests, subject to a net working capital adjustment and an adjustment based on the cash and cash equivalents and amount of indebtedness of Tinet immediately prior to the acquisition. In addition, the Company will provide certain services to Inteliquent without charge for up to three years after the closing.  These services are provided under a separate service agreement that is valued at $2.0 million.
The Company accounted for the acquisition using the acquisition method of accounting with GTT treated as the acquiring entity. Accordingly, consideration paid by the Company to complete the acquisition of Tinet has been allocated to Tinet's assets and liabilities based upon their estimated fair values as of the date of completion of the acquisition, April 30, 2013. The Company estimated the fair value of the acquired companies assets and liabilities based on discussions with management, due diligence and information presented in financial statements. The following table summarizes the purchase price and the assets acquired and liabilities assumed as of the acquisition date at estimated fair value:
	Amounts in
	thousands
Purchase Price:
Cash consideration paid	$	49,158
Liabilities assumed
Accounts payable	4,179
Accrued expenses and other current liabilities	20,607
Deferred revenue	2,443
Total fair value of liabilities assumed	27,229
Total consideration	$	76,387
Purchase Price Allocation:
Acquired assets
Accounts receivable	$	11,601
Prepaid expenses	1,137
Other current assets	5,101
Property and equipment	15,004
Other assets	1,282
Intangible assets	25,800
Total fair value of assets acquired	59,925
Goodwill	16,462
Total consideration	$	76,387
Intangible assets acquired include $25.0 million related to customer relationships with a weighted-average useful life of 5 years and $0.8 million related to the trade name. Customer relationships are amortized on a straight-line basis based on the expected period of benefit. The trade name is assessed as an indefinite-lived asset and is not amortized, but rather tested for impairment at least annually by comparing the estimated fair values to their carrying values.
Goodwill in the amount of $16.5 million was recorded as a result of the acquisition of Tinet. Goodwill is calculated as the excess of the consideration transferred over the net assets recognized and represents the estimated future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. The goodwill is deductible for tax purposes.

GOODWILL_AND_INTANGIBLE_ASSETS

GOODWILL AND INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLE ASSETS	GOODWILL AND INTANGIBLE ASSETS
	On October 1, 2014, the Company completed its annual goodwill impairment testing. The Company performed a Step 1 fair value impairment test and determined that the fair value of the reporting unit is greater than its carrying amount; therefore, the Company concluded that no impairment existed.
	The Company recorded goodwill in the amount of $25.7 million in 2014, in connection with businesses added. During the quarter ended December 31, 2014, the Company recorded goodwill in the amount of $21.4 million in connection with the UNSi acquisition and $15.9 million of the purchase price was allocated to intangible assets related to customer relationships and $1.7 million related to point-to-point FCC license fees. The intangible assets related to customer relationships and the FCC licenses are subject to a straight-line amortization.
	In accordance with GAAP, goodwill and intangible assets with indefinite lives are not amortized, but rather tested for impairment at least annually by comparing the estimated fair values to their carrying values. Acquired trade names are assessed as indefinite lived assets because there is no foreseeable limit on the period of time over which they are expected to contribute cash flows.
	The changes in the carrying amount of goodwill for the years ended December 31, 2014 and 2013 are as follows (amounts in thousands):
	Balance, January 1, 2013	$	49,793
	Goodwill associated with the acquisitions	17,226
	Balance, December 31, 2013	67,019
	Goodwill associated with the acquisitions	25,664
	Balance, December 31, 2014	$	92,683
	The following table summarizes the Company’s intangible assets as of December 31, 2014 and December 31, 2013 (amounts in thousands):
				December 31, 2014
		Amortization		Gross Asset		Accumulated		Net Book
		Period		Cost		Amortization		Value
	Customer contracts	3-7 years		$	85,759	$	29,639	$	56,120
	Non-compete agreements	3-5 years		4,331		4,147		184
	Point-to-point FCC License fees	3 years		1,665		139		1,526
	Trade name (non-amortizing)	N/A		800		—		800
				$	92,555	$	33,925	$	58,630
				December 31, 2013
		Amortization		Gross Asset		Accumulated		Net Book
		Period		Cost		Amortization		Value
	Customer contracts	4-7 years		$	58,611	$	16,218	$	42,393
	Non-compete agreements	4-5 years		4,331		3,906		425
	Trade name (non-amortizing)	N/A		800		—		800
				$	63,742	$	20,124	$	43,618
	Amortization expense was $13.8 million and $10.2 million for the years ended December 31, 2014 and 2013, respectively.
	Estimated amortization expense related to intangible assets subject to amortization at December 31, 2014 in each of the years subsequent to December 31, 2014 is as follows (amounts in thousands):
	2015	$	16,756
	2016	15,668
	2017	13,858
	2018	8,110
	2019	3,438
	Total	$	57,830

DEBT

DEBT	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
DEBT	DEBT
	The following summarizes the debt activity of the Company during the year ended December 31, 2014 (amounts in thousands):
		Total Debt			Senior Term Loan			Delayed Draw Term Loan		Line of Credit			Mezzanine Notes
	Debt obligation as of December 31, 2013	$	92,460		$	61,750		$	—	$	3,000		$	27,710
	Issuance	129,500			110,000			15,000		3,000			1,500
	Debt discount amortization	420			—			—		—			420
	Debt discount extinguishment	1,370			—			—		—			1,370
	Payments	(100,124		)	(63,124		)	—		(6,000		)	(31,000		)
	Debt obligation as of December 31, 2014	$	123,626		$	108,626		$	15,000	$	—		$	—
	Estimated annual commitments for debt maturities are as follows at December 31, 2014 (amounts in thousands):
		Total Debt
	2015	$	6,188
	2016	10,120
	2017	12,331
	2018	12,203
	2019	82,784
	Total	$	123,626
	Senior Term Loan, Delayed Draw Term Loan and Line of Credit
	On August 6, 2014, the Company completed a refinancing transaction (the “Refinancing Transaction”), which included amendments to the First Amended and Restated Credit Agreement ("Credit Agreement"). The Credit Agreement, as amended, provides for $110.0 million in term loans; a $15.0 million revolving credit facility; an available $15.0 million delayed draw term loan ("DDTL"); and an available uncommitted $30.0 million incremental term loan. The maturity of the facilities under the Credit Agreement, as amended, were extended to August 6, 2019. The obligations of the Company under the Credit Agreement are secured by substantially all of the Company’s tangible and intangible assets. Additionally, the Company is in compliance with the reporting and financial covenants stated in the Credit Agreement.
	On September 30, 2014, the Company drew $15.0 million on the DDTL, no amounts had been drawn on the revolving credit facility nor the uncommitted incremental term loan. The DDTL facility will be repaid on a quarterly basis starting March 31, 2016 at 1.875% of the aggregate outstanding balance, increasing to 2.5% of the aggregate outstanding balance starting December 31, 2016, with any remaining amount due on August 6, 2019. The term loan of $110.0 million will be repaid on a quarterly basis starting December 31, 2014 at $1.4 million of the aggregate outstanding balance, increasing to $2.1 million on December 31, 2015, and lastly increasing to $2.7 million on December 31, 2016, with any remaining amount due on August 6, 2019.
	In connection with the Refinancing Transaction, the Company accelerated the amortization of ratable portions of the deferred
	financing costs associated with the prior term loan facilities and portions of the deferred financing costs of the Credit Agreement, as amended, that do not qualify for deferral of $1.4 million. These amounts are reflected in Loss on Debt Extinguishment.
	The interest rate on the Credit Agreement, as amended, is a LIBOR-based tiered pricing tied to our net leverage ratio. As of December 31, 2014, the interest rate was 4.5%.
	Mezzanine Notes
	The Company entered into an agreement on August 6, 2014 ("Mezzanine Credit Agreement") that used the proceeds from the Refinancing Transaction to repay the remaining $31.0 million of indebtedness payable to BIA Digital Partners SBIC II LP, Plexus Fund II, L.P., and BNY Mellon-Alcentra Mezzanine III, L.P. ("Note Holders"). In accordance with the terms of the Mezzanine Credit Agreement, the Company also paid a prepayment penalty of $0.3 million, which is included in Loss on Debt Extinguishment. The remaining original issue discount of the warrant of $1.5 million is included in Loss on Debt Extinguishment.
	Warrants
	On August 6, 2014, in conjunction with the Refinancing Transaction, the Company entered into an agreement with the Note Holders that extinguished the entire balance of the warrant liability of $19.2 million (the "Warrant Purchase and Exercise Agreement"). Under the Warrant Purchase and Exercise Agreement, the Note Holders agreed to sell 1,172,080 of their outstanding Warrants (or 50% of the total outstanding warrants) to the Company for $9.6 million. In addition, the Mezzanine Note Holders agreed to exercise the remaining 1,172,080 warrants on a cash-less basis into 913,749 common shares of the Company.

FAIR_VALUE_MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS
	The accounting standard for fair value measurements establishes a three-tier hierachy which prioritizes the inputs used in measuring fair value.
	The Company considers the valuation of its warrant liability as a level 3 liability based on unobservable inputs. The Company uses the Black-Scholes pricing model to measure the fair value of the warrant liability. During the the year ending December 31, 2014, the model required the input of highly subjective assumptions including volatility of 63%, expected term of 3 years, and risk-free interest rate of 0%.
	Certain sellers may elect to receive up to one-half of the post-closing payments to which they become entitled in the form of common stock of the Company.  The Company considers the valuation of the earn-outs as a level 3 liability based on unobservable inputs and measures the fair value of the option to take the stock using the Black-Scholes pricing model.  During the year ending December 31, 2014, the model required the input of highly subjective assumptions including volatility of 60%, expected term of 3 months, and a risk-free interest rate of 0.1%.   This earn-out was settled in full in April 2014.
	The remaining earn-out liability in 2014 relates to business acquisitions in which the sellers will receive a cash payout based upon the performance of the entity we acquired. There have been no changes to the fair value of this contingent consideration in 2014.
	The following table presents the liabilities that are measured and recognized at fair value on a recurring basis classified under the appropriate level of the fair value hierarchy as of December 31, 2014 and 2013 respectively (amounts in thousands):
		31-Dec-14
		Level 1			Level 2		Level 3		Total
	Liabilities:
	Acquisition earn-out	$	—		$	—	$	3,374	$	3,374
		31-Dec-13
		Level 1			Level 2		Level 3		Total
	Liabilities:
	Warrant liability	$	—		$	—	$	12,295	$	12,295
	Acquisition earn-out	$	—		$	—	$	2,900	$	2,900
	Rollforward of level 3 liabilities are as follows (amounts in thousands):
	Warrant Liability
	Balance, December 31, 2012	$	2,288
	Issuance of warrants	1,349
	Change in fair value	8,658
	Balance, December 31, 2013	12,295
	Paid in cash	(9,576		)
	Settled in shares	(9,576		)
	Change in fair value	6,857
	Issuance of warrants	—
	Balance, December 31, 2014	$	—
	Acquisition Earn-outs
	Balance, December 31, 2012	$	6,200
	Paid in cash	(3,628		)
	Settled in shares	(1,650		)
	Change in the fair value	1,978
	Balance, December 31, 2013	2,900
	Paid in cash	(1,155		)
	Settled in shares	(3,704		)
	Change in fair value	1,554
	Incurred	3,779
	Balance, December 31, 2014	$	3,374
	Assets and liabilities measured at a fair value on a non-recurring basis include goodwill, tangible assets, and intangible assets. Such assets are reviewed quarterly for impairment indicators. If a triggering event has occurred, the assets are remeasured when the estimated fair value of the corresponding asset group is less than the carrying value. The fair value measurements, in such instances, are based on significant unobservable inputs (level 3). There were no impairments recorded during the years ended December 31, 2014 and 2013.

PROPERTY_AND_EQUIPMENT

PROPERTY AND EQUIPMENT	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
PROPERTY AND EQUIPMENT	PROPERTY AND EQUIPMENT
	The following table summarizes the Company’s property and equipment at December 31, 2014 and 2013 (amounts in thousands):
		2014			2013
	Network equipment	$	44,218		$	30,485
	Computer software	3,468			3,423
	Leasehold improvements	2,094			757
	Furniture and fixtures	253			259
	Property and equipment, gross	50,033			34,924
	Less accumulated depreciation and amortization	(24,849		)	(14,474		)
	Property and equipment, net	$	25,184		$	20,450
	Depreciation expense associated with property and equipment was $11.1 million and $6.9 million for the years ended December 31, 2014 and 2013, respectively.

ACCRUED_EXPENSES_AND_OTHER_CUR

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES	ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
	The following table summarizes the Company’s accrued expenses and other current liabilities as of December 31, 2014 and 2013 (amounts in thousands):
		2014		2013
	Accrued compensation and benefits	$	4,385	$	4,257
	Accrued interest payable	—		379
	Accrued taxes	2,446		3,407
	Accrued carrier costs	14,359		13,085
	Acquisition earn-outs and holdbacks	5,942		2,900
	Accrued restructuring	2,101		755
	Accrued other	6,231		2,216
		$	35,464	$	26,999

INCOME_TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES
	The components of the provision for income taxes for the years ended December 31, 2014 and 2013 are as follows (amounts in thousands):
		2014				2013
	Current:
	Federal	$	—			$	—
	State	83				(8		)
	Foreign	1,215				720
	Subtotal	1,298				712
	Deferred:
	Federal	(2,712		)		(6,000		)
	State	(552		)		(803		)
	Foreign	937				1,439
	Subtotal	(2,327		)		(5,364		)
	Change in valuation allowance	3,112				2,647
	Provision for income taxes	$	2,083			$	(2,005	)
	The provision for income taxes differs from the amount computed by applying the U.S. federal statutory income tax rate to income before income taxes for the reasons set forth below for the years ended December 31, 2014 and 2013:
		2014			2013
	U.S. federal statutory income tax rate	35	%		35	%
	Permanent items	(2.79	)%		(10.23	)%
	State taxes, net of federal benefit	(0.43	)%		(0.13	)%
	Foreign tax rate differential	2.04	%		1.55	%
	Warrant extinguishment	(27.79	)%		—	%
	Change in valuation allowance	(15.09	)%		(14.17	)%
	Unrecognized tax positions	(1.53	)%		(1.31	)%
	Italian IRAP tax	1.38	%		(1.6	)%
	Prior year AMT	—	%		0.11	%
	Return to provision adjustments	(0.87	)%		(0.29	)%
	Effective Tax Rate	(10.08	)%		8.93	%
	In 2014, loss before income taxes of $20.9 million consisted of $25.3 million domestic loss and $4.4 million foreign income. In 2013, loss before income taxes of $22.8 million consisted of $23.6 million domestic loss and and $0.8 million foreign income.
	As of December 31, 2014, the Company has net operating loss ("NOL") carryforwards of approximately $72 million for tax purposes which will be available to offset future income. The NOL carryforwards consist of $15.4 million in foreign NOL carryforwards, which have an indefinite carryforward period and $56.6 million in U.S. NOL carryforward. If not used, the US carryforwards will expire between 2020 and 2034. The Company's U.S. NOL carryforward are limited under Section 382 of the Internal Revenue Code ("IRC"). In future periods, an aggregate, tax effected amount of $2.2 million of NOL's will be recorded to Additional paid-in-capital when carried forward excess tax benefits from stock based compensation are utilized to reduce future cash tax payments.
	Deferred income taxes reflect the net effects of net operating loss carryforwards and the temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company's deferred tax assets and liabilities at December 31, 2014 and 2013 are as follows (amounts in thousands):
			2014				2013
	Deferred tax assets:
	Net operating loss carryforwards		$	24,735			$	8,442
	Capital loss and trade deficit loss carryforwards		678				745
	Allowance for doubtful accounts		1,683				860
	Fixed assets		1,972				286
	Intangible Assets		—				5,585
	Mark to market adjustment		—				3,794
	Stock compensation		984				671
	Miscellaneous items		1,389				1,435
	Total deferred tax assets before valuation allowance		31,441				21,818
	Less: Valuation allowance		(23,756		)		(19,806		)
	Total deferred tax assets		7,685				2,012
	Deferred tax liabilities:
	Intangibles		5,887				—
	Miscellaneous items		942				239
	Total deferred tax liabilities		6,829				239
	Net deferred tax liability		$	(856	)		$	(1,773	)
	The Company currently has significant deferred tax assets primarily resulting from NOL carryforwards. The significant increase in NOL as of December 31, 2014 resulted from acquired NOL as a result of the acquisitions in 2014. As of December 31, 2014, the Company provided a full valuation allowance against its net US deferred tax assets since, based on the application of the criteria in ASC 740, it concluded that it was more likely than not that the benefits of these assets would not be realized in the future. Following the criteria in ASC 740, the Company reviews this valuation allowance on a quarterly basis assessing the positive and negative evidence to determine if it is more likely than not that some or all of the deferred tax assets will be realized. Based on its assessment as of December 31, 2014, the Company determined to maintain valuation allowance in the US and Italy. The Company will continue to evaluate the need a valuation allowance in the other foreign jurisdictions.
	Foreign earnings are considered to be permanently reinvested and, accordingly, no U.S. federal and state income taxes have been provided theron.
	The Company applies guidance for uncertainty in income taxes that requires the application of a more likely than not threshold to the recognition and de-recognition of uncertain tax positions. If the recognition threshold is met, this guidance permits the Company to recognize a tax benefit measured at the largest amount of the tax benefit that, in the Company’s judgment, is more likely than not to be realized upon settlement. The Company has performed an analysis of all open years, December 31, 2009 to December 31, 2014 and the expected tax positions to be taken at the balance sheet date. At December 31, 2014, approximately $2.2 million of unrecognized tax benefits including penalties and interest in conjunction with its activities in certain countries where a permanent establishment may give rise to corporate income taxes. Of the $2.2 million recorded, $1.5 million was established through purchase price accounting on 2013. The gross unrecognized tax benefit amount is not expected to materially change in the next 12 months. The following table presents a reconciliation of the beginning and ending amounts of unrecognized tax benefits:
		2014				2013
	Balance, January 1	$	1,851			$	—
	Changes for tax positions of prior years	—				1,851
	Increases for tax positions related to the current year	342				—
	Settlements and lapsing of statues of limitations	(26		)		—
	Balance, December 31	$	2,167			$	1,851

RESTRUCTURING_COSTS_EMPLOYEE_T

RESTRUCTURING COSTS, EMPLOYEE TERMINATION AND OTHER ITEMS	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
RESTRUCTURING COSTS, EMPLOYEE TERMINATION AND OTHER ITEMS	RESTRUCTURING COSTS, EMPLOYEE TERMINATION AND OTHER ITEMS
	During the year ended December 31, 2014, the Company incurred $6.1 million in costs associated with the UNSi acquisition, including payroll and employee severance costs, professional fees, termination costs associated with network grooming, and travel expenses. In addition, the Company recorded a $3.3 million litigation settlement for the Artel LLC litigation as a restructuring cost during the year ended December 31, 2014.
	The restructuring charges and accruals established by the Company are summarized as follows for the year ended December 31, 2014 (amounts in thousands):
		Charges Net		Cash		Balance, December 31, 2014
		of Reversals		Payments
	Employment costs	$	3,725	$	3,495	$	230
	Professional fees	1,003		332		671
	Integration expenses	100		75		25
	Travel and other expenses	1,297		122		1,175
	Total	$	6,125	$	4,024	$	2,101
	During the year ended December 31, 2013, the Company incurred $7.7 million in costs associated with executing and closing the IDC and Tinet acquisitions, including payroll and employee severance costs, professional fees, termination costs associated with network grooming, and travel expenses.
	The restructuring charges and accruals established by the Company, and activities related thereto, are summarized as follows for the year ended December 31, 2013 (amounts in thousands):
		Charges Net		Cash		Balance, December 31, 2013
		of Reversals		Payments
	Employment costs	$	4,600	$	4,564	$	36
	Professional fees	1,565		1,246		319
	Integration expenses	1,282		891		391
	Travel and other expenses	230		221		9
	Total	$	7,677	$	6,922	$	755
	The $0.8 million accrued for at December 31, 2013 was paid by March 31, 2014.

EMPLOYEE_STOCKBASED_COMPENSATI

EMPLOYEE STOCK-BASED COMPENSATION BENEFITS	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
EMPLOYEE STOCK-BASED COMPENSATION BENEFITS	EMPLOYEE STOCK-BASED COMPENSATION BENEFITS
	Stock-Based Compensation Plan
	The Company adopted its 2006 Employee, Director and Consultant Stock Plan (the “2006 Plan”) in October 2006. In addition to stock options, the Company may also grant restricted stock or other stock-based awards under the 2006 Plan. The maximum number of shares issuable over the term of the 2006 Plan is limited to 3,500,000 shares.
	The Company adopted its 2011 Employee, Director and Consultant Stock Plan (the “2011 Plan”) in June 2011.  In addition to stock options, the Company may also grant restricted stock or other stock-based awards under the 2011 Plan. The maximum number of shares issuable over the term of the 2011 Plan is limited to 3,000,000 shares.  The 2006 Plan will continue according to its terms.
	The Plan permits the granting of stock options and restricted stock to employees (including employee directors and officers) and consultants of the Company, and non-employee directors of the Company. Options granted under the Plan have an exercise price of at least 100% of the fair market value of the underlying stock on the grant date and expire no later than ten years from the grant date. The options generally vest over four years with 25% of the option shares becoming exercisable one year from the date of grant and the remaining 75% annually or quarterly over the following three years. The Compensation Committee of the Board of Directors, as administrator of the Plan, has the discretion to use a different vesting schedule.
	Stock Options
	Due to the Company’s limited history as a public company, the Company has estimated expected volatility based on the historical volatility of certain comparable companies as determined by management. The risk-free interest rate assumption is based upon observed interest rates at the time of grant appropriate for the term of the Company’s employee stock options. The dividend yield assumption is based on the Company’s intent not to issue a dividend under its dividend policy. The Company uses the simplified method to estimate the options’ expected term. Assumptions used in the calculation of the stock option expense were as follows:
			2014		2013
	Volatility		62.2% - 63.2%		60.2% - 63.4%
	Risk free rate		1.7% - 2.0%		1.0% - 1.9%
	Term		6.25		6.25
	Dividend yield		—	%	—	%
	Stock-based compensation expense recognized in the accompanying consolidated statement of operations for the year ended December 31, 2014 is based on awards ultimately expected to vest, reduced for estimated forfeitures. Forfeiture assumptions were based upon management’s estimate.
	The fair value of each stock option grant to employees is estimated on the date of grant. The fair value of each stock option grant to non-employees is estimated on the applicable performance commitment date, performance completion date or interim financial reporting date.
	During the years ended December 31, 2014 and 2013, the Company recognized compensation expense related to stock options of $0.9 million and $0.4 million, respectively, related to stock options issued to employees and consultants, which is included in selling, general and administrative expense on the accompanying consolidated statements of operations.
	During the year ended December 31, 2014, 459,450 options were granted pursuant to the Plan. The following table summarizes information concerning options outstanding as of December 31, 2014:
			Options		Weighted Average		Weighted			Weighted Average	Aggregate
					Exercise Price		Average			Remaining	Intrinsic
							Fair Value			Contractual	Value
										Life (Years)
	Balance, December 31, 2013		1,697,500		$	2.09	$	0.47		7.31	$	7,962,468
	Granted		459,450		12.44		7.35			9.31	—
	Exercised		(633,754	)	1.67		1.1			5.12	1,278,434
	Forfeited		(159,736	)	4.98		2.85			8.18	1,606,253
	Balance, December 31, 2014		1,363,460		$	5.41	$	3.17		7.52	$	10,664,023
	Exercisable		557,305		$	1.83	$	1.12		6.09	$	6,355,069
	As of December 31, 2014, the vested portion of share-based compensation expense was $0.6 million. As of December 31, 2014, the unvested portion of share-based compensation expense attributable to stock options and the period in which such expense is expected to vest and be recognized is as follows (amounts in thousands):
	2015	$	880
	2016	983
	2017	840
	2018	240
	Total	$	2,943
	The fair value of share-based compensation for options that vested as of December 31, 2014 was $2.9 million.
	During the year ended December 31, 2013, 486,750 options were granted pursuant to the Plan. The following table summarizes information concerning options outstanding as of December 31, 2013:
			Options		Weighted Average		Weighted			Weighted Average		Aggregate
					Exercise Price		Average			Remaining		Intrinsic
							Fair Value			Contractual		Value
										Life (Years)
	Balance at December 31, 2012		1,395,250		$	1.49	$	0.43		7.23		$	1,834,685
	Granted		486,750		3.64		2.07			—		—
	Exercised		(92,125	)	—		—			—		279,830
	Forfeited		(92,375	)	1.03		0.56			—		594,455
	Balance at December 31, 2013		1,697,500		$	2.09	$	0.47		7.31		$	7,962,468
	Exercisable		829,913		$	4.34	$	0.93		5.81		$	4,885,047
	As of December 31, 2013, the vested portion of share-based compensation expense was $0.8 million. As of December 31, 2013, the unvested portion of share-based compensation expense attributable to stock options and the period in which such expense is expected to vest and be recognized is as follows (amounts in thousands):
	2014	$	427
	2015	370
	2016	284
	2017	97
	Total	$	1,178
	The fair value of share-based compensation for options that vested as of December 31, 2013 was $1.2 million.
	Restricted Stock
	The fair value of the restricted shares issued is amortized on a straight-line basis over the vesting periods. During the year ended December 31, 2014 and 2013, the Company recognized compensation expense related to restricted stock of $1.5 million and $1.1 million, respectively, which is included in selling, general and administrative expense on the accompanying consolidated statements of operations.
	Following table summarizes restricted stock activity during the years ended December 31, 2014 and 2013:
			2014				2013
			Shares		Weighted		Shares		Weighted
					Average				Average
					Fair				Fair
					Value				Value
	Nonvested Balance at January 1,		976,938		$	2.96	660,001		$	1.66
	Granted		1,016,902		12.48		727,357		3.58
	Forfeited		(142,503	)	12.57		(5,000	)	3.4
	Vested		(405,762	)	10.88		(405,420	)	5.02
	Nonvested Balance at December 31,		1,445,575		$	10.92	976,938		$	2.96
As of December 31, 2014, the non-vested portion of share-based compensation expense attributable to restricted stock amounts to $1.5 million which is expected to vest and be recognized during a weighted-average period of 10.8 years.

DEFINED_CONTRIBUTION_PLAN

DEFINED CONTRIBUTION PLAN	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
DEFINED CONTRIBUTION PLAN	DEFINED CONTRIBUTION PLAN
	The Company has a defined contribution retirement plan under Section 401(k) of the IRC that covers substantially all U.S. based employees. Eligible employees may contribute amounts to the plan, via payroll withholding, subject to certain limitations. During 2014 and 2013, the Company matched 40% of employees’ contributions to the plan. The Company’s 401(k) expense was $239,000 in 2014 and $179,000 in 2013.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES
	Office Space and Operating Leases
	Office facility leases may provide for escalations of rent or rent abatements and payment of pro rata portions of building operating expenses. The Company is currently headquartered in McLean, Virginia and has 8 offices throughout the United States, 5 offices in Europe and one office in Hong Kong.
	The Company records rent expense using the straight-line method over the term of the lease agreement. Office facility rent expense was $2.1 million and $1.2 million for the years ended December 31, 2014 and 2013, respectively.
	Estimated annual commitments under non-cancelable operating leases are as follows at December 31, 2014 (amounts in thousands):
		Office Space		Other
	2015	$	2,411	$	574
	2016	2,079		474
	2017	2,078		474
	2018	1,211		—
	2019	1,200
	2020 and beyond	794
		$	9,773	$	1,522
	Commitments - Supply agreements
	As of December 31, 2014, the Company had supplier agreement purchase obligations of $58.6 million associated with the telecommunications services that the Company has contracted to purchase from its vendors. The Company’s contracts are generally such that the terms and conditions in the vendor and client customer contracts are substantially the same in terms of duration. The back-to-back nature of the Company’s contracts means that the largest component of its contractual obligations is generally mirrored by its customer’s commitment to purchase the services associated with those obligations.
	Estimated annual commitments under supplier contractual agreements are as follows at December 31, 2014 (amounts in thousands):
		Supplier
		Agreements
	2015	$	11,431
	2016	15,670
	2017	21,662
	2018	1,025
	2019	2,740
	2020 and beyond	6,085
		$	58,613
	If a customer disconnects its service before the term ordered from the vendor expires, and if GTT were unable to find another customer for the capacity, GTT may be subject to an early termination liability. Under standard telecommunications industry practice (commonly referred to in the industry as “portability”), this early termination liability may be waived by the vendor if GTT were to order replacement service with the vendor of equal or greater value to the service canceled. Additionally, the Company maintains some fixed network costs and from time to time, if it deems portions of the network are not economically beneficial, the Company may disconnect those portions and potentially incur early termination liabilities.
	“Take-or-Pay” Purchase Commitments
	Some of the Company’s supplier purchase agreements call for the Company to make monthly payments to suppliers whether or not the Company is currently utilizing the underlying capacity in that particular month (commonly referred to in the industry as “take-or-pay” commitments). As of December 31, 2014 and 2013, the Company’s aggregate monthly obligations under such take-or-pay commitments over the remaining term of all of those contracts totaled $2.2 million and $4.3 million, respectively.
	Contingencies - Legal proceedings
	From time to time, the Company is a party to legal proceedings arising in the normal course of its business. Aside from the matters discussed below, the Company does not believe that it is a party to any pending legal action that could reasonably be expected to have a material adverse effect on its business or operating results, financial position or cash flows.

FOREIGN_OPERATIONS

FOREIGN OPERATIONS	12 Months Ended
	Dec. 31, 2014
Foreign Operations [Abstract]
FOREIGN OPERATIONS	FOREIGN OPERATIONS
	The Company’s operations are located primarily in the United States and Europe. The Company’s financial data by geographic area is as follows:
		US		ITALY		UK		OTHER		Total GTT
	2014
	Revenues by geographic area	$	118,966	$	56,547	$	27,092	$	4,738	$	207,343
	Long-lived assets at December 31	$	126,762	$	38,172	$	9,840	$	1,723	$	176,497
	2013
	Revenues by geographic area	$	88,995	$	39,959	$	23,481	$	4,933	$	157,368
	Long-lived assets at December 31	$	73,462	$	46,510	$	11,109	$	6	$	131,087

SUBSEQUENT_EVENT_SUBSEQUENT_EV1

SUBSEQUENT EVENT SUBSEQUENT EVENT (Notes)	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
SUBSEQUENT EVENT	SUBSEQUENT EVENT
	On February 19, 2015, the Company entered into a definitive agreement to acquire the Managed Services business of MegaPath Corporation, which provides private wide-area-networking, Internet access services, managed services and managed security to multinational clients.
	Under the terms of the agreement, the Company will pay $144.8 million in cash and 610,843 shares of the Company's common stock for the acquisition. The Company expects to close on the acquisition on, or around, April 1, 2015 after obtaining regulatory approvals.

SIGNIFICANT_ACCOUNTING_POLICIE1

SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation of Consolidated Financial Statements	The consolidated financial statements include the accounts of the Company and it's wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation.
Use of Estimates	The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America ("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 consolidated financial statements, and the reported amounts of revenue and expenses during the reporting period. Significant accounting estimates to be made by management include allowances for doubtful accounts, valuation of goodwill and other long-lived assets, accrual for billing disputes, and valuation of equity instruments. Because of the uncertainty inherent in such estimates, actual results may differ from these estimates.
Revenue Recognition	Revenue Recognition
	We deliver three primary services to our customers—EtherCloud, our flexible Ethernet-based connectivity service; Internet Services, our reliable, high bandwidth internet connectivity services; and Managed Services, our provision of fully managed network services so organizations can focus on their core business. Our extensive network and broad geographic reach enable us to cost-effectively deliver the bandwidth, scale and security demanded by our customers. Certain of the Company’s current revenue activities have features that may be considered multiple elements. The Company believes that there is insufficient evidence to determine each element’s fair value and as a result, in those arrangements where there are multiple elements, revenue is recorded ratably over the term of the arrangement.
	Network Services and Support.   The Company’s services are provided pursuant to contracts that typically provide for payments of recurring charges on a monthly basis for use of the services over a committed term. Each service contract has a fixed monthly cost and a fixed term, in addition to a fixed installation charge (if applicable). At the end of the initial term of most service contracts, the contracts roll forward on a month-to-month or other periodic basis and continue to bill at the same fixed recurring rate. If any cancellation or termination charges become due from the customer as a result of early cancellation or termination of a service contract, those amounts are calculated pursuant to a formula specified in each contract. Recurring costs relating to supply contracts are recognized ratably over the term of the contract.
	Non-recurring Fees, Deferred Revenue.  Non-recurring fees for data connectivity typically take the form of one-time, non-refundable provisioning fees established pursuant to service contracts. The amount of the provisioning fee included in each contract is generally determined by marking up or passing through the corresponding charge from the Company’s supplier, imposed pursuant to the Company’s purchase agreement. Non-recurring revenue earned for providing provisioning services in connection with the delivery of recurring communications services is recognized ratably over the contractual term of the recurring service starting upon commencement of the service contract term. Fees recorded or billed from these provisioning services are initially recorded as deferred revenue then recognized ratably over the contractual term of the recurring service. Installation costs related to provisioning incurred by the Company from independent third party suppliers, directly attributable and necessary to fulfill a particular service contract, and which costs would not have been incurred but for the occurrence of that service contract, are recorded as deferred contract costs and expensed proportionally over the contractual term of service in the same manner as the deferred revenue arising from that contract. Deferred costs do not exceed deferred upfront fees. Based on operating activity, the Company believes the initial contractual term is the best estimate of the period of earnings.
	Other Revenue.   From time to time, the Company recognizes revenue in the form of fixed or determinable cancellation (pre-installation) or termination (post-installation) charges imposed pursuant to the service contract. This revenue is earned when a customer cancels or terminates a service agreement prior to the end of its committed term. This revenue is recognized when billed if collectability is reasonably assured. In addition, the Company from time to time sells equipment in connection with data networking applications. The Company recognizes revenue from the sale of equipment at the contracted selling price when title to the equipment passes to the customer (generally F.O.B. origin) and when collectability is reasonably assured.
	Universal Service Fund (USF), Gross Receipts Taxes and Other Surcharges
	The Company is liable in certain cases for collecting regulatory fees and/or certain sales taxes from its customers and remitting the fees and taxes to the applicable governing authorities. The Company records taxes applicable on a net basis.
Translation of Foreign Currencies	Translation of Foreign Currencies
	These consolidated financial statements have been reported in U.S. Dollars by translating asset and liability amounts of foreign subsidiaries at the closing exchange rate, equity amounts at historical rates, and the results of operations and cash flow at the average exchange rate prevailing during the periods reported.
	Transactions denominated in foreign currencies are recorded at the rates of exchange prevailing at the time of the transaction. Monetary assets and liabilities denominated in foreign currencies are translated at the rate of exchange prevailing at the balance sheet date. Exchange differences arising upon settlement of a transaction are reported in the consolidated statements of operations in other expense.
Accounts Receivable, Net	Accounts Receivable, Net
	Accounts receivable balances are stated at amounts due from the customer net of an allowance for doubtful accounts. Credit extended is based on an evaluation of the customer’s financial condition and is granted to qualified customers on an unsecured basis.
	The Company, pursuant to its standard service contracts, is entitled to impose a finance charge of a certain percentage per month with respect to all amounts that are past due. The Company’s standard terms require payment within 30 days of the date of the invoice. The Company treats invoices as past due when they remain unpaid, in whole or in part, beyond the payment time set forth in the applicable service contract.
	The Company determines its allowance for doubtful accounts by considering a number of factors, including the length of time trade receivables are past due, the customer’s current ability to pay its obligation to the Company, and the condition of the general economy and the industry as a whole. Specific reserves are also established on a case-by-case basis by management. The Company writes off accounts receivable when they become uncollectible. Credit losses have historically been within management’s expectations. Actual bad debts, when determined, reduce the allowance, the adequacy of which management then reassesses. The Company writes off accounts after a determination by management that the amounts at issue are no longer likely to be collected, following the exercise of reasonable collection efforts, and upon management’s determination that the costs of pursuing collection outweigh the likelihood of recovery.
Other Comprehensive Loss	Other Comprehensive Loss
	In addition to net loss, comprehensive loss includes charges or credits to equity occurring other than as a result of transactions with stockholders. For the Company, this consists of foreign currency translation adjustments.
Share-Based Compensation	Share-Based Compensation
	Share-based compensation expense recognized in the Company’s consolidated statements of operations for the years ended December 31, 2014 and 2013, included compensation expense for share-based payment awards based on the grant date fair value with the expense recognized on a straight-line over the requisite service period.
	The Company uses the Black-Scholes option-pricing model to determine the fair value of its awards at the time of grant.
Cash and Cash Equivalents	Cash and Cash Equivalents
	Included in cash and cash equivalents are deposits with financial institutions as well as short-term money market instruments, certificates of deposit and debt instruments with maturities of three months or less when purchased.
Accounting for Derivative Instruments	Accounting for Derivative Instruments
	Derivative instruments are recorded in the consolidated balance sheet as either assets or liabilities, measured at fair value. The Company issued warrants to the Mezzanine Note Holders which have been recorded as a liability with the fair value of the liability being remeasured on a quarterly basis.
Income Taxes	Income Taxes
	The Company provides for income taxes as a "C" corporation on income earned from operations. The Company is subject to federal, state, and foreign taxation in various jurisdictions.
	Deferred tax assets and liabilities are recorded to recognize the expected future tax benefits or costs of events that have been, or will be, reported in different years for financial statement purposes than for tax purposes. Deferred tax assets and liabilities are computed based on the difference between the financial statement carrying amount and tax basis of assets and liabilities using enacted tax rates and laws for the years in which these items are expected to reverse. If management determines that some portion or all of a deferred tax asset is not “more likely than not” to be realized, a valuation allowance is recorded as a component of the income tax provision to reduce the deferred tax asset to an appropriate level in that period. In determining the need for a valuation allowance, management considers all positive and negative evidence, including historical earnings, projected future taxable income, future reversals of existing taxable temporary differences, taxable income in prior carryback periods, and prudent, feasible tax-planning strategies.
	The Company may, from time to time, be assessed interest and/or penalties by taxing jurisdictions, although any such assessments historically have been minimal and immaterial to its financial results. The Company’s federal, state and international tax returns for 2011, 2012, 2013 and 2014 are still open. In the event the Company has received an assessment for interest and/or penalties, it has been classified in the consolidated statements of operations as other general and administrative costs.
Net Loss Per Share	Net Loss Per Share
	Basic loss per share is computed by dividing net loss available to common stockholders by the weighted average number of common shares outstanding. Diluted earnings per share reflect, in periods with earnings and in which they have a dilutive effect, the effect of common shares issuable upon exercise of stock options and warrants.
Software Capitalization	Software Capitalization
	Software development costs include costs to develop software programs to be used solely to meet our internal needs and cloud based applications used to deliver our services. The Company capitalizes development costs related to these software applications once the preliminary project stage is complete and it is probable that the project will be completed and the software will be used to perform the function intended. Costs capitalized for developing such software applications were not material for the periods presented.
Property and Equipment	Property and Equipment
	Property and equipment are stated at cost, net of accumulated depreciation computed using the straight-line method. Depreciation on these assets is computed over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the term of the lease, excluding optional extensions, or the useful life. Depreciable lives used by the Company for its classes of assets are as follows:
	Furniture and Fixtures	7 years
	Network Equipment	5 years
	Leasehold Improvements	up to 10 years
	Computer Hardware and Software	3-5 years
	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 the assets may not be recoverable. If the carrying amount of an asset exceeds its estimated future undiscounted cash flows, the asset is considered to be impaired. Impairment losses are measured as the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell.
Goodwill	The Company assesses goodwill for impairment on at least an annual basis on October 1 unless interim indicators of impairment exist. Goodwill is considered to be impaired when the net book value of a reporting unit exceeds its estimated fair value. The Company operates as a single operating segment and as a single reporting unit for the purpose of evaluating goodwill. As of October 1, 2014, the Company performed its annual impairment test of goodwill by comparing the fair value of the Company (primarily based on market capitalization) to the carrying value of equity, and concluded that the fair value of the reporting unit was greater than the carrying amount. During the fiscal years ended December  31, 2014, and 2013 the Company did not record any goodwill impairment.
Intangible Assets	Intangible assets consist of customer relationships, restrictive covenants related to employment agreements, license fees and a trade name. Customer relationships and restrictive covenants related to employment agreements are amortized, on a straight-line basis, over periods of up to seven years. Point-to-point FCC Licenses are accounted for as definite lived intangibles and amortized over the average remaining useful life of such licenses which approximates three years. The trade name is not amortized, but is tested on at least an annual basis as of October 1 unless interim indicators of impairment exist. The trade name is considered to be impaired when the net book value exceeds its estimated fair value. As of October 1, 2014 the Company performed its annual impairment test of the trade name, and concluded that the fair value of the trade name was greater than the carrying amount. The Company used the relief from royalty method for valuation. The fair value of the asset is the present value of the license fees avoided by owning the asset, or the royalty sav
Business Combinations	Business Combinations
	The Company includes the results of operations of the businesses that it acquires as of the respective dates of acquisition. The Company allocates the fair value of the purchase price of its acquisitions to the assets acquired and liabilities assumed based on their estimated fair values. The excess of the fair value of the purchase price over the fair values of these identifiable assets and liabilities is recorded as goodwill.
Concentrations of Credit Risk	Concentrations of Credit Risk
	Financial instruments potentially subjecting the Company to a significant concentration of credit risk consist primarily of cash and cash equivalents. At times during the periods presented, the Company had funds in excess of $250,000 insured by the U.S. Federal Deposit Insurance Corporation, or in excess of similar Deposit Insurance programs outside of the United States, on deposit at various financial institutions. As of December 31, 2014, approximately $45.2 million of the Company’s deposits were held at institutions as balances in excess of the U.S. Federal Deposit Insurance Corporation and international insured deposit limits for those institutions. However, management believes the Company is not exposed to significant credit risk due to the financial position of the depository institutions in which those deposits are held.
	The Company's trade receivables, which are unsecured, are geographically dispersed. No customers' trade receivable balance as of December 31, 2014 and 2013 exceeded 10% of the Company's consolidated accounts receivable, net.
	For the years ended December 31, 2014 and 2013, no single customer exceeded 10% of total consolidated revenue.
Fair Value of Financial Instruments	Fair Value of Financial Instruments
	The Company accounts for fair value measurements in accordance with the fair value accounting standard as it relates to financial assets and financial liabilities. The Company establishes a fair value hierarchy that distinguishes between (1) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (2) an entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs).
	The fair value hierarchy consists of three broad levels, which prioritizes the inputs used in measuring fair value as follows: observable inputs such as quoted prices in active markets (Level 1); inputs other than quoted prices in active markets that are observable either directly or indirectly (Level 2); and unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions (Level 3).
	The carrying amounts of cash equivalents, receivables, accounts payable, and accrued expenses approximate fair value due to the immediate or short-term maturity of these financial instruments. The fair value of notes payable is determined using current applicable rates for similar instruments as of the consolidated balance sheet date and approximates the carrying value of such debt.
Accrued Carrier Expenses	Accrued Carrier Expenses
	The Company accrues estimated charges owed to its suppliers for services. The Company bases this accrual on the supplier contract, the individual service order executed with the supplier for that service, the length of time the service has been active, and the overall supplier relationship.
Disputed Carrier Expenses	Disputed Carrier Expenses
	It is common in the telecommunications industry for users and suppliers to engage in disputes over amounts billed (or not billed) in error or over interpretation of contract terms. The disputed carrier cost included in the consolidated financial statements includes disputed but unresolved amounts claimed as due by suppliers, unless management is confident, based upon its experience and its review of the relevant facts and contract terms, that the outcome of the dispute will not result in liability for the Company. Management estimates this liability and reconciles the estimates with actual results as disputes are resolved, or as the appropriate statute of limitations with respect to a given dispute expires.
Segment Reporting	Segment Reporting
	The Company reports operating results and financial data in one operating and reportable segment. The Company manages its business as a single profit center in order to promote collaboration, provide comprehensive service offerings across its entire customer base, and provide incentives to employees based on the success of the organization as a whole. Although certain information regarding geographic markets and selected products or services are discussed for purposes of promoting an understanding of the Company's complex business, the Company manages its business and allocates resources at the consolidated level of a single operating segment.
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	On May 28, 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Codification ("ASC") 606, Revenue From Contracts With Customers. The guidance in ASC 606 supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific guidance throughout the Industry Topics of the Codification. ASC 606 states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company is assessing the impact of ASC 606 and will adopt the guidance for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016.
	On August 27, 2014, the FASB issued an Accounting Standard Update ("ASU") 2014-15, Disclosure of Uncertainties About an Entity's Ability to Continue as a Going Concern, which provides guidance on determining when and how reporting entities must disclose going-concern uncertainties in their financial statements. The new standard requires management to perform interim and annual assessments of an entity's ability to continue as a going concern within one year of the date of issuance of the entity's financial statements (or within one year after the date on which the financial statements are available to be issued, when applicable). Further, an entity must provide certain disclosures if there is "substantial doubt about the entity's ability to continue as a going concern". The impact of adopting this guidance on January 1, 2017 is not expected to have a material impact on the Company's consolidated financial statements.

SIGNIFICANT_ACCOUNTING_POLICIE2

SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Schedule of Differences between Reported Amount and Reporting Currency Denominated Amount	A summary of exchange rates used is as follows:
		U.S. Dollar / British Pounds Sterling				U.S. Dollar / Euro
		2014		2013		2014		2013
	Closing exchange rate at December 31	1.55		1.65		1.22		1.38
	Average exchange rate during the period	1.65		1.56		1.33		1.33
Schedule of Other Nonoperating Income (Expense)	The following table presents other expense, net by type:
		2014				2013
	Change in fair value of warrant liability	$	6,857			$	8,658
	Change in fair value of acquisition earn-outs	1,554				1,978
	Other	225				1,088
		$	8,636			$	11,724
Schedule of Earnings Per Share, Basic and Diluted	The table below details the calculations of earnings per share (in thousands, except for share and per share amounts):
		Year Ended December 31,
		2014				2013
	Numerator for basic and diluted EPS – loss available to common stockholders	$	(22,979	)		$	(20,789	)
	Denominator for basic EPS – weighted average shares	27,011,381				21,985,241
	Effect of dilutive securities	—				—
	Denominator for diluted EPS – weighted average shares	27,011,381				21,985,241
	Loss per share: basic	$	(0.85	)		$	(0.95	)
	Loss per share: diluted	$	(0.85	)		$	(0.95	)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The table below details the anti-dilutive common share items that were excluded in the computation of earnings per share (amounts in thousands):
		Year Ended December 31,
		2014			2013
	BIA warrant	—			1,055
	Plexus warrant	—			960
	Alcentra warrant	—			329
	Stock options	1,363			1,698
	Totals	1,363			4,042
Schedule Of Property Plan And Equipment Estimated Useful Life	Depreciable lives used by the Company for its classes of assets are as follows:
	Furniture and Fixtures	7 years
	Network Equipment	5 years
	Leasehold Improvements	up to 10 years
	Computer Hardware and Software	3-5 years

ACQUISITIONS_Tables

ACQUISITIONS (Tables)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the purchase price and the assets acquired and liabilities assumed as of the acquisition date at estimated fair value:
		Amounts in
		thousands
	Purchase Price:
	Cash consideration paid	$	3,593
	Fair value of liabilities assumed	1,338
	Total consideration	$	4,931
	Purchase Price Allocation:
	Acquired Assets
	Current assets	$	187
	Property and equipment	798
	Other assets	82
	Intangible assets	3,100
	Total fair value of assets acquired	4,167
	Goodwill	764
	Total consideration	$	4,931
	The following table summarizes the purchase price and the assets acquired and liabilities assumed as of the acquisition date at estimated fair value:
		Amounts in
		thousands
	Purchase Price:
	Cash consideration paid	$	49,158
	Liabilities assumed
	Accounts payable	4,179
	Accrued expenses and other current liabilities	20,607
	Deferred revenue	2,443
	Total fair value of liabilities assumed	27,229
	Total consideration	$	76,387
	Purchase Price Allocation:
	Acquired assets
	Accounts receivable	$	11,601
	Prepaid expenses	1,137
	Other current assets	5,101
	Property and equipment	15,004
	Other assets	1,282
	Intangible assets	25,800
	Total fair value of assets acquired	59,925
	Goodwill	16,462
	Total consideration	$	76,387
	The following table summarizes the purchase price and the preliminary allocation of assets acquired and liabilities assumed as of the acquisition date at estimated fair value:
		Amounts in thousands
	Purchase Price:
	Total cash consideration	$	29,978
	Total holdback	2,568
	Total stock consideration	2,884
	Fair value of liabilities assumed	16,052
	Total consideration	$	51,482
	Purchase Price Allocation:
	Acquired Assets
	Current assets	$	4,292
	Property and equipment	8,181
	Intangible assets	17,605
	Total fair value of assets acquired	30,078
	Goodwill	21,404
	Total consideration	$	51,482
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated amortization expense related to intangible assets created as a result of the UNSi acquisition for each of the years subsequent to December 31, 2014, is as follows (amounts in thousands):
	2015	$	3,914
	2016	3,743
	2017	3,604
	2018	3,188
	2019	2,391
	Total	$	16,840
	Estimated amortization expense related to intangible assets subject to amortization at December 31, 2014 in each of the years subsequent to December 31, 2014 is as follows (amounts in thousands):
	2015	$	16,756
	2016	15,668
	2017	13,858
	2018	8,110
	2019	3,438
	Total	$	57,830
Business Acquisition, Pro Forma Information	The unaudited pro forma results of operations do not reflect the cost of any integration activities or benefits that may result from synergies that may be derived from any integration activities.
		Year Ended December 31,
		2014			2013
	Amounts in thousands, except per share and share data
	Revenue	$	252,642		$	206,811
	Net loss	$	(31,639	)	$	(33,829	)
	Net loss per share:
	Basic	$	(1.17	)	$	(1.54	)
	Diluted	$	(1.17	)	$	(1.54	)
	Basic	27,011,381			21,985,241
	Diluted	27,011,381			21,985,241

GOODWILL_AND_INTANGIBLE_ASSETS1

GOODWILL AND INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of goodwill for the years ended December 31, 2014 and 2013 are as follows (amounts in thousands):
	Balance, January 1, 2013	$	49,793
	Goodwill associated with the acquisitions	17,226
	Balance, December 31, 2013	67,019
	Goodwill associated with the acquisitions	25,664
	Balance, December 31, 2014	$	92,683
Schedule of Finite-Lived Intangible Assets	The following table summarizes the Company’s intangible assets as of December 31, 2014 and December 31, 2013 (amounts in thousands):
				December 31, 2014
		Amortization		Gross Asset		Accumulated		Net Book
		Period		Cost		Amortization		Value
	Customer contracts	3-7 years		$	85,759	$	29,639	$	56,120
	Non-compete agreements	3-5 years		4,331		4,147		184
	Point-to-point FCC License fees	3 years		1,665		139		1,526
	Trade name (non-amortizing)	N/A		800		—		800
				$	92,555	$	33,925	$	58,630
				December 31, 2013
		Amortization		Gross Asset		Accumulated		Net Book
		Period		Cost		Amortization		Value
	Customer contracts	4-7 years		$	58,611	$	16,218	$	42,393
	Non-compete agreements	4-5 years		4,331		3,906		425
	Trade name (non-amortizing)	N/A		800		—		800
				$	63,742	$	20,124	$	43,618
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated amortization expense related to intangible assets created as a result of the UNSi acquisition for each of the years subsequent to December 31, 2014, is as follows (amounts in thousands):
	2015	$	3,914
	2016	3,743
	2017	3,604
	2018	3,188
	2019	2,391
	Total	$	16,840
	Estimated amortization expense related to intangible assets subject to amortization at December 31, 2014 in each of the years subsequent to December 31, 2014 is as follows (amounts in thousands):
	2015	$	16,756
	2016	15,668
	2017	13,858
	2018	8,110
	2019	3,438
	Total	$	57,830

DEBT_Tables

DEBT (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Debt	The following summarizes the debt activity of the Company during the year ended December 31, 2014 (amounts in thousands):
		Total Debt			Senior Term Loan			Delayed Draw Term Loan		Line of Credit			Mezzanine Notes
	Debt obligation as of December 31, 2013	$	92,460		$	61,750		$	—	$	3,000		$	27,710
	Issuance	129,500			110,000			15,000		3,000			1,500
	Debt discount amortization	420			—			—		—			420
	Debt discount extinguishment	1,370			—			—		—			1,370
	Payments	(100,124		)	(63,124		)	—		(6,000		)	(31,000		)
	Debt obligation as of December 31, 2014	$	123,626		$	108,626		$	15,000	$	—		$	—
Schedule of Maturities of Long-term Debt	Estimated annual commitments for debt maturities are as follows at December 31, 2014 (amounts in thousands):
		Total Debt
	2015	$	6,188
	2016	10,120
	2017	12,331
	2018	12,203
	2019	82,784
	Total	$	123,626

FAIR_VALUE_MEASUREMENTS_Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Inputs, Liabilities, Quantitative Information	The following table presents the liabilities that are measured and recognized at fair value on a recurring basis classified under the appropriate level of the fair value hierarchy as of December 31, 2014 and 2013 respectively (amounts in thousands):
		31-Dec-14
		Level 1			Level 2		Level 3		Total
	Liabilities:
	Acquisition earn-out	$	—		$	—	$	3,374	$	3,374
		31-Dec-13
		Level 1			Level 2		Level 3		Total
	Liabilities:
	Warrant liability	$	—		$	—	$	12,295	$	12,295
	Acquisition earn-out	$	—		$	—	$	2,900	$	2,900
Fair Value Liabilities Roll Forward	Rollforward of level 3 liabilities are as follows (amounts in thousands):
	Warrant Liability
	Balance, December 31, 2012	$	2,288
	Issuance of warrants	1,349
	Change in fair value	8,658
	Balance, December 31, 2013	12,295
	Paid in cash	(9,576		)
	Settled in shares	(9,576		)
	Change in fair value	6,857
	Issuance of warrants	—
	Balance, December 31, 2014	$	—
	Acquisition Earn-outs
	Balance, December 31, 2012	$	6,200
	Paid in cash	(3,628		)
	Settled in shares	(1,650		)
	Change in the fair value	1,978
	Balance, December 31, 2013	2,900
	Paid in cash	(1,155		)
	Settled in shares	(3,704		)
	Change in fair value	1,554
	Incurred	3,779
	Balance, December 31, 2014	$	3,374

PROPERTY_AND_EQUIPMENT_Tables

PROPERTY AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	The following table summarizes the Company’s property and equipment at December 31, 2014 and 2013 (amounts in thousands):
		2014			2013
	Network equipment	$	44,218		$	30,485
	Computer software	3,468			3,423
	Leasehold improvements	2,094			757
	Furniture and fixtures	253			259
	Property and equipment, gross	50,033			34,924
	Less accumulated depreciation and amortization	(24,849		)	(14,474		)
	Property and equipment, net	$	25,184		$	20,450

ACCRUED_EXPENSES_AND_OTHER_CUR1

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Schedule of Accounts Payable and Accrued Liabilities	The following table summarizes the Company’s accrued expenses and other current liabilities as of December 31, 2014 and 2013 (amounts in thousands):
		2014		2013
	Accrued compensation and benefits	$	4,385	$	4,257
	Accrued interest payable	—		379
	Accrued taxes	2,446		3,407
	Accrued carrier costs	14,359		13,085
	Acquisition earn-outs and holdbacks	5,942		2,900
	Accrued restructuring	2,101		755
	Accrued other	6,231		2,216
		$	35,464	$	26,999

INCOME_TAXES_Tables

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The components of the provision for income taxes for the years ended December 31, 2014 and 2013 are as follows (amounts in thousands):
		2014				2013
	Current:
	Federal	$	—			$	—
	State	83				(8		)
	Foreign	1,215				720
	Subtotal	1,298				712
	Deferred:
	Federal	(2,712		)		(6,000		)
	State	(552		)		(803		)
	Foreign	937				1,439
	Subtotal	(2,327		)		(5,364		)
	Change in valuation allowance	3,112				2,647
	Provision for income taxes	$	2,083			$	(2,005	)
Schedule of Effective Income Tax Rate Reconciliation	The provision for income taxes differs from the amount computed by applying the U.S. federal statutory income tax rate to income before income taxes for the reasons set forth below for the years ended December 31, 2014 and 2013:
		2014			2013
	U.S. federal statutory income tax rate	35	%		35	%
	Permanent items	(2.79	)%		(10.23	)%
	State taxes, net of federal benefit	(0.43	)%		(0.13	)%
	Foreign tax rate differential	2.04	%		1.55	%
	Warrant extinguishment	(27.79	)%		—	%
	Change in valuation allowance	(15.09	)%		(14.17	)%
	Unrecognized tax positions	(1.53	)%		(1.31	)%
	Italian IRAP tax	1.38	%		(1.6	)%
	Prior year AMT	—	%		0.11	%
	Return to provision adjustments	(0.87	)%		(0.29	)%
	Effective Tax Rate	(10.08	)%		8.93	%
Schedule of Deferred Tax Assets and Liabilities	Significant components of the Company's deferred tax assets and liabilities at December 31, 2014 and 2013 are as follows (amounts in thousands):
			2014				2013
	Deferred tax assets:
	Net operating loss carryforwards		$	24,735			$	8,442
	Capital loss and trade deficit loss carryforwards		678				745
	Allowance for doubtful accounts		1,683				860
	Fixed assets		1,972				286
	Intangible Assets		—				5,585
	Mark to market adjustment		—				3,794
	Stock compensation		984				671
	Miscellaneous items		1,389				1,435
	Total deferred tax assets before valuation allowance		31,441				21,818
	Less: Valuation allowance		(23,756		)		(19,806		)
	Total deferred tax assets		7,685				2,012
	Deferred tax liabilities:
	Intangibles		5,887				—
	Miscellaneous items		942				239
	Total deferred tax liabilities		6,829				239
	Net deferred tax liability		$	(856	)		$	(1,773	)
Schedule of Unrecognized Tax Benefits Roll Forward	The following table presents a reconciliation of the beginning and ending amounts of unrecognized tax benefits:
		2014				2013
	Balance, January 1	$	1,851			$	—
	Changes for tax positions of prior years	—				1,851
	Increases for tax positions related to the current year	342				—
	Settlements and lapsing of statues of limitations	(26		)		—
	Balance, December 31	$	2,167			$	1,851

RESTRUCTURING_COSTS_EMPLOYEE_T1

RESTRUCTURING COSTS, EMPLOYEE TERMINATION AND OTHER ITEMS (Tables)	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Related Costs	The restructuring charges and accruals established by the Company, and activities related thereto, are summarized as follows for the year ended December 31, 2013 (amounts in thousands):
		Charges Net		Cash		Balance, December 31, 2013
		of Reversals		Payments
	Employment costs	$	4,600	$	4,564	$	36
	Professional fees	1,565		1,246		319
	Integration expenses	1,282		891		391
	Travel and other expenses	230		221		9
	Total	$	7,677	$	6,922	$	755
	The restructuring charges and accruals established by the Company are summarized as follows for the year ended December 31, 2014 (amounts in thousands):
		Charges Net		Cash		Balance, December 31, 2014
		of Reversals		Payments
	Employment costs	$	3,725	$	3,495	$	230
	Professional fees	1,003		332		671
	Integration expenses	100		75		25
	Travel and other expenses	1,297		122		1,175
	Total	$	6,125	$	4,024	$	2,101

EMPLOYEE_STOCKBASED_COMPENSATI1

EMPLOYEE STOCK-BASED COMPENSATION BENEFITS (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	Assumptions used in the calculation of the stock option expense were as follows:
			2014		2013
	Volatility		62.2% - 63.2%		60.2% - 63.4%
	Risk free rate		1.7% - 2.0%		1.0% - 1.9%
	Term		6.25		6.25
	Dividend yield		—	%	—	%
Schedule of Share-based Compensation, Stock Options, Activity	During the year ended December 31, 2014, 459,450 options were granted pursuant to the Plan. The following table summarizes information concerning options outstanding as of December 31, 2014:
			Options		Weighted Average		Weighted			Weighted Average	Aggregate
					Exercise Price		Average			Remaining	Intrinsic
							Fair Value			Contractual	Value
										Life (Years)
	Balance, December 31, 2013		1,697,500		$	2.09	$	0.47		7.31	$	7,962,468
	Granted		459,450		12.44		7.35			9.31	—
	Exercised		(633,754	)	1.67		1.1			5.12	1,278,434
	Forfeited		(159,736	)	4.98		2.85			8.18	1,606,253
	Balance, December 31, 2014		1,363,460		$	5.41	$	3.17		7.52	$	10,664,023
	Exercisable		557,305		$	1.83	$	1.12		6.09	$	6,355,069
Share Based Compensation Expenses Expected To Vest and Recognized	As of December 31, 2014, the unvested portion of share-based compensation expense attributable to stock options and the period in which such expense is expected to vest and be recognized is as follows (amounts in thousands):
	2015	$	880
	2016	983
	2017	840
	2018	240
	Total	$	2,943
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	Following table summarizes restricted stock activity during the years ended December 31, 2014 and 2013:
			2014				2013
			Shares		Weighted		Shares		Weighted
					Average				Average
					Fair				Fair
					Value				Value
	Nonvested Balance at January 1,		976,938		$	2.96	660,001		$	1.66
	Granted		1,016,902		12.48		727,357		3.58
	Forfeited		(142,503	)	12.57		(5,000	)	3.4
	Vested		(405,762	)	10.88		(405,420	)	5.02
	Nonvested Balance at December 31,		1,445,575		$	10.92	976,938		$	2.96

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Estimated annual commitments under non-cancelable operating leases are as follows at December 31, 2014 (amounts in thousands):
		Office Space		Other
	2015	$	2,411	$	574
	2016	2,079		474
	2017	2,078		474
	2018	1,211		—
	2019	1,200
	2020 and beyond	794
		$	9,773	$	1,522
Contractual Obligation, Fiscal Year Maturity Schedule	Estimated annual commitments under supplier contractual agreements are as follows at December 31, 2014 (amounts in thousands):
		Supplier
		Agreements
	2015	$	11,431
	2016	15,670
	2017	21,662
	2018	1,025
	2019	2,740
	2020 and beyond	6,085
		$	58,613

FOREIGN_OPERATIONS_Tables

FOREIGN OPERATIONS (Tables)	12 Months Ended
	Dec. 31, 2014
Foreign Operations [Abstract]
Schedule Of Revenue From External Customers And Long Lived Assets By Entity Wide Foreign Operations	The Company’s operations are located primarily in the United States and Europe. The Company’s financial data by geographic area is as follows:
		US		ITALY		UK		OTHER		Total GTT
	2014
	Revenues by geographic area	$	118,966	$	56,547	$	27,092	$	4,738	$	207,343
	Long-lived assets at December 31	$	126,762	$	38,172	$	9,840	$	1,723	$	176,497
	2013
	Revenues by geographic area	$	88,995	$	39,959	$	23,481	$	4,933	$	157,368
	Long-lived assets at December 31	$	73,462	$	46,510	$	11,109	$	6	$	131,087

SIGNIFICANT_ACCOUNTING_POLICIE3

SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013
Accounting Policies [Abstract]
Closing exchange rate at December 31	1.55	1.55	1.65	1.65
Average exchange rate during the period	1.33	1.65	1.33	1.56

SIGNIFICANT_ACCOUNTING_POLICIE4

SIGNIFICANT ACCOUNTING POLICIES (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 30, 2014	Aug. 06, 2014
Accounting Policies [Abstract]
Other expense, net of income	$8,636,000	$11,724,000
Allowance for doubtful accounts receivable	900,000	700,000
Change in fair value of warrant liability	6,857,000	8,658,000
Warrant liability	0	12,295,000	19,200,000	19,200,000
Finite-Lived Intangible Assets [Line Items]
Loss contingency, estimate of possible loss	6,900,000	7,300,000
Loss contingency, range of possible loss, maximum	$2,100,000	$2,300,000
Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Weighted Average [Member] | Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years

SIGNIFICANT_ACCOUNTING_POLICIE5

SIGNIFICANT ACCOUNTING POLICIES (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Change in fair value of warrant liability	$6,857	$8,658
Change in fair value of acquisition earn-outs	1,554	1,978
Other	225	1,088
Other expense, net	$8,636	$11,724

SIGNIFICANT_ACCOUNTING_POLICIE6

SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Numerator for basic and diluted EPS b loss available to common stockholders (in dollars)	($22,979)	($20,789)
Denominator for basic EPS - weighted average shares	27,011,381	21,985,241
Effect of dilutive securities	0	0
Denominator for diluted EPS - weighted average shares	27,011,381	21,985,241
Loss per share: basic (in dollars per share)	($0.85)	($0.95)
Loss per share: diluted (in dollars per share)	($0.85)	($0.95)

SIGNIFICANT_ACCOUNTING_POLICIE7

SIGNIFICANT ACCOUNTING POLICIES (Details 3)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive items	1,363	4,042
Bia Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive items	0	1,055
Plexus Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive items	0	960
Alecentra Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive items	0	329
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive items	1,363	1,698

SIGNIFICANT_ACCOUNTING_POLICIE8

SIGNIFICANT ACCOUNTING POLICIES (Details 4)	12 Months Ended
	Dec. 31, 2014
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Network Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Computer Hardware and Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Computer Hardware and Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years

SIGNIFICANT_ACCOUNTING_POLICIE9

SIGNIFICANT ACCOUNTING POLICIES (Details Textual 1) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	customer	customer
Accounting Policies [Abstract]
Cash, Uninsured Amount	45.2
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Concentration Risk [Line Items]
Number of major customers	0	0
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of major customers	0	0

ACQUISITIONS_Details_Textual

ACQUISITIONS (Details Textual) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 01, 2014	Feb. 01, 2013	Apr. 30, 2013	Apr. 30, 2013	Dec. 31, 2012
				facility
Business Acquisition [Line Items]
Amortization of intangible assets	$13,800,000	$10,200,000
Goodwill	92,683,000	67,019,000					49,793,000
United Network Services, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Purchase price			35,400,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares			231,539
Total holdback			2,568,000
Business Combination, Payment Withheld, Period			1 year
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			16,052,000
Total consideration			51,482,000
Intangible assets			17,605,000
Amortization of intangible assets	800,000
Goodwill			21,404,000
United Network Services, Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets			15,900,000
Acquired finite-lived intangible assets, weighted average useful life			5 years
United Network Services, Inc. [Member] | Licensing Agreements [Member]
Business Acquisition [Line Items]
Intangible assets			1,700,000
Acquired finite-lived intangible assets, weighted average useful life			3 years
Idc [Member]
Business Acquisition [Line Items]
Number of Facilities Acquired				2
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Purchase price				3,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				1,338,000
Total consideration				4,931,000
Intangible assets				3,100,000
Goodwill				764,000
Idc [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets				3,100,000
Acquired finite-lived intangible assets, weighted average useful life				5 years
Tinet [Member]
Business Acquisition [Line Items]
Purchase price					49,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities					27,229,000	27,229,000
Total consideration					76,387,000	76,387,000
Intangible assets					25,800,000	25,800,000
Goodwill					16,462,000	16,462,000
Business Combination, Contingent Consideration, Term of Services					3 years
Business Combination, Contingent Consideration, Liability					2,000,000	2,000,000
Tinet [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets					800,000	800,000
Tinet [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets					$25,000,000	$25,000,000
Acquired finite-lived intangible assets, weighted average useful life						5 years

ACQUISITIONS_Purchase_Price_De

ACQUISITIONS (Purchase Price) (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Oct. 01, 2014	Feb. 01, 2013	Apr. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Purchase Price Allocation:
Goodwill				$92,683	$67,019	$49,793
United Network Services, Inc. [Member]
Purchase Price:
Cash consideration paid	29,978
Total holdback	2,568
Total stock consideration	2,884
Fair value of liabilities assumed	16,052
Total consideration	51,482
Purchase Price Allocation:
Current assets	4,292
Property and equipment	8,181
Intangible assets	17,605
Total fair value of assets acquired	30,078
Goodwill	21,404
Total consideration	51,482
Idc [Member]
Purchase Price:
Cash consideration paid		3,593
Fair value of liabilities assumed		1,338
Total consideration		4,931
Purchase Price Allocation:
Current assets		187
Property and equipment		798
Other assets		82
Intangible assets		3,100
Total fair value of assets acquired		4,167
Goodwill		764
Total consideration		4,931
Tinet [Member]
Purchase Price:
Cash consideration paid			49,158
Accounts payable			4,179
Accrued expenses and other current liabilities			20,607
Deferred revenue			2,443
Fair value of liabilities assumed			27,229
Total consideration			76,387
Purchase Price Allocation:
Accounts receivable			11,601
Prepaid expenses			1,137
Other current assets			5,101
Property and equipment			15,004
Other assets			1,282
Intangible assets			25,800
Total fair value of assets acquired			59,925
Goodwill			16,462
Total consideration			$76,387

ACQUISITIONS_Estimated_Amortiz

ACQUISITIONS (Estimated Amortization Expense) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Business Acquisition [Line Items]
2015	$16,756
2016	15,668
2017	13,858
2018	8,110
2019	3,438
Net Book Value	57,830
United Network Services, Inc. [Member]
Business Acquisition [Line Items]
2015	3,914
2016	3,743
2017	3,604
2018	3,188
2019	2,391
Net Book Value	$16,840

ACQUISITIONS_Pro_Forma_Results

ACQUISITIONS (Pro Forma Results) (Details) (United Network Services, Inc. [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
United Network Services, Inc. [Member]
Business Acquisition [Line Items]
Revenue	$252,642	$206,811
Net loss	($31,639)	($33,829)
Net loss per share, Basic (in dollars per share)	($1.17)	($1.54)
Net loss per share, Diluted (in dollars per share)	($1.17)	($1.54)
Weighted average shares outstanding, Basic (in shares)	27,011,381	21,985,241
Weighted average shares outstanding, Diluted (in shares)	27,011,381	21,985,241

GOODWILL_AND_INTANGIBLE_ASSETS2

GOODWILL AND INTANGIBLE ASSETS (Details Textual) (USD $)	12 Months Ended		3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Acquired During Period	$25,664,000	$17,226,000
Amortization of intangible assets	13,800,000	10,200,000
United Network Services, Inc. [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Acquired During Period			21,400,000
Amortization of intangible assets	800,000
United Network Services, Inc. [Member] | Customer Relationships [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Acquired finite-lived intangible asset, amount			15,900,000
United Network Services, Inc. [Member] | Licensing Agreements [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Acquired finite-lived intangible asset, amount			$1,700,000

GOODWILL_AND_INTANGIBLE_ASSETS3

GOODWILL AND INTANGIBLE ASSETS (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Beginning balance	$67,019	$49,793
Goodwill associated with acquisition	25,664	17,226
Ending balance	$92,683	$67,019

GOODWILL_AND_INTANGIBLE_ASSETS4

GOODWILL AND INTANGIBLE ASSETS (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Intangible Assets [Line Items]
Accumulated Amortization	33,925	20,124
Net Book Value	57,830
Gross Asset Cost	92,555	63,742
Net Book Value	58,630	43,618
Trade Names [Member]
Schedule of Intangible Assets [Line Items]
Trade name (non-amortizing)	800	800
Customer contracts [Member]
Schedule of Intangible Assets [Line Items]
Gross Asset Cost	85,759	58,611
Accumulated Amortization	29,639	16,218
Net Book Value	56,120	42,393
Customer contracts [Member] | Minimum [Member]
Schedule of Intangible Assets [Line Items]
Amortization Period	3 years	4 years
Customer contracts [Member] | Maximum [Member]
Schedule of Intangible Assets [Line Items]
Amortization Period	7 years	7 years
Non-compete agreements [Member]
Schedule of Intangible Assets [Line Items]
Gross Asset Cost	4,331	4,331
Accumulated Amortization	4,147	3,906
Net Book Value	184	425
Non-compete agreements [Member] | Minimum [Member]
Schedule of Intangible Assets [Line Items]
Amortization Period	3 years	4 years
Non-compete agreements [Member] | Maximum [Member]
Schedule of Intangible Assets [Line Items]
Amortization Period	5 years	5 years
Point-to-point FCC License fees [Member]
Schedule of Intangible Assets [Line Items]
Amortization Period	3 years
Gross Asset Cost	1,665
Accumulated Amortization	139
Net Book Value	1,526

GOODWILL_AND_INTANGIBLE_ASSETS5

GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$16,756
2016	15,668
2017	13,858
2018	8,110
2019	3,438
Net Book Value	$57,830

DEBT_Details

DEBT (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt [Roll Forward]
Beginning balance	$92,460,000
Issuance	129,500,000
Debt discount amortization	420,000	601,000
Debt discount extinguishment	1,370,000
Payments	-100,124,000
Ending balance	123,626,000	92,460,000
2015	6,188,000
2016	10,120,000
2017	12,331,000
2018	12,203,000
2019	82,784,000
Total	123,626,000
Senior Term Loan
Debt [Roll Forward]
Beginning balance	61,750,000
Issuance	110,000,000
Debt discount amortization	0
Debt discount extinguishment	0
Payments	-63,124,000
Ending balance	108,626,000
Delayed Draw Term Loan
Debt [Roll Forward]
Beginning balance	0
Issuance	15,000,000
Debt discount amortization	0
Debt discount extinguishment	0
Payments	0
Ending balance	15,000,000
Line of Credit
Debt [Roll Forward]
Beginning balance	3,000,000
Issuance	3,000,000
Debt discount amortization	0
Debt discount extinguishment	0
Payments	-6,000,000
Ending balance	0
Mezzanine Notes
Debt [Roll Forward]
Beginning balance	27,710,000
Issuance	1,500,000
Debt discount amortization	420,000
Debt discount extinguishment	1,370,000
Payments	-31,000,000
Ending balance	$0

DEBT_Details_Textual

DEBT (Details Textual) (USD $)	0 Months Ended	12 Months Ended		0 Months Ended
	Aug. 06, 2014	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Dec. 30, 2014
Debt Instrument [Line Items]
Long-term Debt		$123,626,000
Gains (losses) on extinguishment of debt		-3,104,000	-706,000
Warrant liability	19,200,000	0	12,295,000		19,200,000
Class of Warrant or Right, Retired During Period, Number	1,172,080
Class of Warrant or Right, Retired During Period, Percentage Of Outstanding	50.00%
Payments for Repurchase of Warrants	9,600,000	9,576,000	0
Class of Warrant or Right, Exercises During Period, Number	1,172,080
Stock Issued During Period, Shares, Conversion of Convertible Securities	913,749
Amended Credit Agreement, August 2014
Debt Instrument [Line Items]
Gains (losses) on extinguishment of debt	-1,400,000
Debt interest rate at period end				4.50%
Amended Credit Agreement, August 2014 | Mezzanine Notes
Debt Instrument [Line Items]
Gains (losses) on extinguishment of debt	1,500,000
Extinguishment of debt	31,000,000
Payments of Debt Extinguishment Costs	300,000
Term Loan | Amended Credit Agreement, August 2014
Debt Instrument [Line Items]
Debt face amount	110,000,000
Term Loan | Amended Credit Agreement, August 2014 | Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Percent				1.88%
Debt Instrument, Periodic Payment				1,400,000
Term Loan | Amended Credit Agreement, August 2014 | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment				2,100,000
Term Loan | Amended Credit Agreement, August 2014 | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Percent				2.50%
Debt Instrument, Periodic Payment				2,700,000
Revolving Credit Facility | Amended Credit Agreement, August 2014
Debt Instrument [Line Items]
Maximum borrowing capacity	15,000,000
Long-term Debt				0
Delayed Term Revolver Facility | Amended Credit Agreement, August 2014
Debt Instrument [Line Items]
Maximum borrowing capacity	15,000,000
Long-term Debt				15,000,000
Incremental Revolver | Amended Credit Agreement, August 2014
Debt Instrument [Line Items]
Maximum borrowing capacity	$30,000,000

FAIR_VALUE_MEASUREMENTS_Detail

FAIR VALUE MEASUREMENTS (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset impairment charges	$0	$0
Warranty liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Assumptions, Weighted Average Volatility Rate		63.00%
Fair Value Assumptions, Expected Term		3 years
Fair Value Assumptions, Risk Free Interest Rate		0.00%
Earn-out Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Assumptions, Weighted Average Volatility Rate		60.00%
Fair Value Assumptions, Expected Term		3 months
Fair Value Assumptions, Risk Free Interest Rate		0.10%

FAIR_VALUE_MEASUREMENTS_Detail1

FAIR VALUE MEASUREMENTS (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Warranty liability [Member]
Liabilities:
Liabilities		$12,295
Warranty liability [Member] | Level 1 [Member]
Liabilities:
Liabilities		0
Warranty liability [Member] | Level 2 [Member]
Liabilities:
Liabilities		0
Warranty liability [Member] | Level 3 [Member]
Liabilities:
Liabilities	0	12,295	2,288
Earn-out Liability [Member]
Liabilities:
Liabilities	3,374	2,900
Earn-out Liability [Member] | Level 1 [Member]
Liabilities:
Liabilities	0	0
Earn-out Liability [Member] | Level 2 [Member]
Liabilities:
Liabilities	0	0
Earn-out Liability [Member] | Level 3 [Member]
Liabilities:
Liabilities	$3,374	$2,900	$6,200

FAIR_VALUE_MEASUREMENTS_Detail2

FAIR VALUE MEASUREMENTS (Details 1) (USD $)	0 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Aug. 06, 2014	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Paid in cash	($9,600)	($9,576)	$0
Issuance of warrants		-9,576	0
Settled in shares		-3,704	-1,650
Warranty liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance			12,295
Earn-out Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance		3,374	2,900
Level 3 [Member] | Warranty liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance		12,295	2,288
Paid in cash		-9,576
Issuance of warrants		0	1,349
Settled in shares		-9,576
Change in fair value		6,857	8,658
Balance		0	12,295
Level 3 [Member] | Earn-out Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance		2,900	6,200
Paid in cash		-1,155	-3,628
Settled in shares		-3,704	-1,650
Change in fair value		1,554	1,978
Incurred		3,779
Balance		$3,374	$2,900

PROPERTY_AND_EQUIPMENT_Details

PROPERTY AND EQUIPMENT (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$50,033	$34,924
Less accumulated depreciation and amortization	-24,849	-14,474
Property and equipment, net	25,184	20,450
Network equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	44,218	30,485
Computer software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,468	3,423
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,094	757
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$253	$259

PROPERTY_AND_EQUIPMENT_Details1

PROPERTY AND EQUIPMENT (Details Textual) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Depreciation expense	$11.10	$6.90

ACCRUED_EXPENSES_AND_OTHER_CUR2

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Payables and Accruals [Abstract]
Accrued compensation and benefits	$4,385	$4,257
Accrued interest payable	0	379
Accrued taxes	2,446	3,407
Accrued carrier costs	14,359	13,085
Acquisition earn-outs and holdbacks	5,942	2,900
Accrued restructuring	2,101	755
Accrued other	6,231	2,216
Accrued Liabilities and Other Liabilities	$35,464	$26,999

INCOME_TAXES_Details

INCOME TAXES (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$0	$0
State	83	-8
Foreign	1,215	720
Subtotal	1,298	712
Deferred:
Federal	-2,712	-6,000
State	-552	-803
Foreign	937	1,439
Subtotal	-2,327	-5,364
Change in valuation allowance	3,112	2,647
Provision for income taxes	$2,083	($2,005)

INCOME_TAXES_Details_1

INCOME TAXES (Details 1)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	35.00%	35.00%
Permanent Items	-2.79%	-10.23%
State taxes, net of defined benefit	-0.43%	-0.13%
Foreign tax rate differential	2.04%	1.55%
Warrant extinguishment	-27.79%	0.00%
Change in valuation allowance	-15.09%	-14.17%
Unrecognized tax positions	-1.53%	-1.31%
Italian IRAP tax	1.38%	-1.60%
Prior year AMT	0.00%	0.11%
Return to provision adjustments	-0.87%	-0.29%
Effective Tax Rate	-10.08%	8.93%

INCOME_TAXES_Details_Textual

INCOME TAXES (Details Textual) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest	($20.90)	($22.80)
Income (loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest, domestic	-25.3	-23.6
Income (loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest, foreign	4.4	0.8
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	72
Operating loss carryforwards, future tax affected amounts to be recorded to additional paid-in capital	2.2
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	56.6
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$15.40

INCOME_TAXES_Details_2

INCOME TAXES (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Net operating loss carryforwards	$24,735	$8,442
Capital loss and trade deficit loss carryforwards	678	745
Allowance for doubtful accounts	1,683	860
Fixed assets	1,972	286
Intangible Assets	0	5,585
Mark to market adjustment	0	3,794
Stock compensation	984	671
Miscellaneous items	1,389	1,435
Total deferred tax assets before valuation allowance	31,441	21,818
Less: valuation allowance	-23,756	-19,806
Total deferred tax assets	7,685	2,012
Deferred tax liabilities:
Intangibles	5,887	0
Miscellaneous items	942	239
Total deferred tax liabilities	6,829	239
Net deferred tax liability	($856)	($1,773)

INCOME_TAXES_Details_Textual_1

INCOME TAXES (Details Textual 1) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$2,167,000	$1,851,000	$0
Unrecognized tax benefits, portion established through purchase price accounting		$1,500,000

INCOME_TAXES_Details_3

INCOME TAXES (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1	$1,851	$0
Changes for tax positions of prior years	0	1,851
Increases for tax positions related to the current year	342	0
Settlements and lapsing of statues of limitations	-26	0
Balance, December 31	$2,167	$1,851

RESTRUCTURING_COSTS_EMPLOYEE_T2

RESTRUCTURING COSTS, EMPLOYEE TERMINATION AND OTHER ITEMS (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Litigation Settlement, Expense	$3,300,000
Other Restructuring Costs	9,425,000	7,677,000
Restructuring Reserve	2,101,000	755,000
United Network Services, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Acquisition Related Costs	6,100,000
Idc and Tilnet Acquisitions [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Acquisition Related Costs		$7,700,000

RESTRUCTURING_COSTS_EMPLOYEE_T3

RESTRUCTURING COSTS, EMPLOYEE TERMINATION AND OTHER ITEMS (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring accrual	$2,101	$755
Employment costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	230	36
Professional fees [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	671	319
Integration expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	25	391
Travel and other expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,175	9
Charges Net Of Reversals [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring accrual	6,125	7,677
Charges Net Of Reversals [Member] | Employment costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,725	4,600
Charges Net Of Reversals [Member] | Professional fees [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,003	1,565
Charges Net Of Reversals [Member] | Integration expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	100	1,282
Charges Net Of Reversals [Member] | Travel and other expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,297	230
Cash Payments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring accrual	4,024	6,922
Cash Payments [Member] | Employment costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,495	4,564
Cash Payments [Member] | Professional fees [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	332	1,246
Cash Payments [Member] | Integration expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	75	891
Cash Payments [Member] | Travel and other expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$122	$221

EMPLOYEE_STOCKBASED_COMPENSATI2

EMPLOYEE STOCK-BASED COMPENSATION BENEFITS (Details Textual) (USD $)	12 Months Ended		1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2011	Oct. 31, 2006	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shared-based compensation	$2,418,000	$1,466,000
Options granted (in shares)	459,450	486,750
Options, vested, fair value	600,000	800,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	557,305	829,913
Share-based compensation expenses expected to vest and recognized	2,943,000	1,178,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,445,575	976,938			660,001
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$10.92	$2.96			$1.66
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shared-based compensation	1,500,000	1,100,000
Awards outstanding, weighted average remaining contractual terms	10 years 9 months 18 days
Employees and Consultants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shared-based compensation	$900,000	$400,000
Options granted (in shares)		486,750
Periodic Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, exercise price, percent	100.00%
Employee Director Consultant Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New stock issues in period (in shares)			3,000,000	3,500,000
Employee Director Consultant Stock Plan [Member] | Periodic Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period	10 years
Stock Option 25 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, vested and expected to vest, outstanding, weighted average remaining contractual term	4 years
Stock Option 25 [Member] | Periodic Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	25.00%
Stock Option 75 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, vested and expected to vest, outstanding, weighted average remaining contractual term	3 years
Percent of awards vesting after initial year	75.00%

EMPLOYEE_STOCKBASED_COMPENSATI3

EMPLOYEE STOCK-BASED COMPENSATION BENEFITS (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Volatility,Minimum	62.20%	60.20%
Volatility,Maximum	63.20%	63.40%
Risk free rate,Minimum	1.70%	1.00%
Risk free rate,Maximum	2.00%	1.90%
Term	6 years 3 months	6 years 3 months
Dividend yield	0.00%	0.00%

EMPLOYEE_STOCKBASED_COMPENSATI4

EMPLOYEE STOCK-BASED COMPENSATION BENEFITS (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Options
Options, Balance (in shares)	1,697,500	1,395,250
Options, Granted (in shares)	459,450	486,750
Options, Exercised (in shares)	-633,754	-92,125
Options, Forfeited (in shares)	-159,736	-92,375
Options, Balance (in shares)	1,363,460	1,697,500	1,395,250
Options, Exercisable (in shares)	557,305	829,913
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Balance	$2.09	$1.49
Weighted Average Exercise Price, Granted	$12.44	$3.64
Weighted Average Exercise Price, Exercised	$1.67	$0
Weighted Average Exercise Price, Forfeited	$4.98	$1.03
Weighted Average Exercise Price, Balance	$5.41	$2.09	$1.49
Weighted Average Exercise Price, Exercisable	$1.83	$4.34
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Fair Value, Outstanding	$3.17	$0.47	$0.43
Weighted Average Fair Value, Granted	$7.35	$2.07
Weighted Average Fair Value, Exercised	$1.10	$0
Weighted Average Fair Value, Forfeited	$2.85	$0.56
Weighted Average Fair Value, Exercisable	$1.12	$0.93
Weighted Average Remaining Contractual Life (Years), Balance	7 years 6 months 7 days	7 years 3 months 22 days	7 years 2 months 23 days
Weighted Average Remaining Contractual Life (Years), Granted	9 years 3 months 22 days
Weighted Average Remaining Contractual Life (Years), Exercised	5 years 1 month 12 days
Weighted Average Remaining Contractual Life (Years), Forfeited	8 years 1 month 34 days
Weighted Average Remaining Contractual Life (Years), Exercisable	6 years 1 month 2 days	5 years 9 months 23 days
Weighted Average Aggregate Intrinsic Value, Granted (in dollars)	$0	$0
Weighted Average Aggregate Intrinsic Value, Exercised (in dollars)	1,278,434	279,830
Weighted Average Aggregate Intrinsic Value, Forfeited (in dollars)	1,606,253	594,455
Weighted Average Aggregate Intrinsic Value, Outstanding (in dollars)	10,664,023	7,962,468	1,834,685
Weighted Average Aggregate Intrinsic Value, Exercisable (in dollars)	$6,355,069	$4,885,047

EMPLOYEE_STOCKBASED_COMPENSATI5

EMPLOYEE STOCK-BASED COMPENSATION BENEFITS (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Next Year	$880	$427
Year Two	983	370
Year Three	840	284
Year Four	240	97
Total	$2,943	$1,178

EMPLOYEE_STOCKBASED_COMPENSATI6

EMPLOYEE STOCK-BASED COMPENSATION BENEFITS (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Shares
Shares, Nonvested Balance at January 1, (in shares)	976,938	660,001
Shares, Granted (in shares)	1,016,902	727,357
Shares, Forfeited (in shares)	-142,503	-5,000
Shares, Vested (in shares)	-405,762	-405,420
Shares, Nonvested Balance at December 31, (in shares)	1,445,575	976,938
Weighted Average Fair Value
Weighted Average Fair Value, Nonvested Balance at January 1,	$2.96	$1.66
Weighted Average Fair Value, Granted	$12.48	$3.58
Weighted Average Fair Value, Forfeited	$12.57	$3.40
Weighted Average Fair Value, Vested	$10.88	$5.02
Weighted Average Fair Value, Nonvested Balance at December 31,	$10.92	$2.96

DEFINED_CONTRIBUTION_PLAN_Deta

DEFINED CONTRIBUTION PLAN (Details Textual) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Defined contribution plan, employer matching contribution, percent	40.00%	40.00%
Defined contribution plan, cost recognized	$239	$179

COMMITMENTS_AND_CONTINGENCIES_1

COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Office Space
Operating Leased Assets [Line Items]
Rent expense	$2,100,000	$1,200,000
2015	2,411,000
2016	2,079,000
2017	2,078,000
2018	1,211,000
2019	1,200,000
2020 and beyond	794,000
Future minimum lease payments	9,773,000
Other
Operating Leased Assets [Line Items]
2015	574,000
2016	474,000
2017	474,000
2018	0
2019
2020 and beyond
Future minimum lease payments	$1,522,000

COMMITMENTS_AND_CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES (Details Textual) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies [Line Items]
Purchase obligation	$2,200,000	$4,300,000
Supplier Agreements
Commitments and Contingencies [Line Items]
Contractual obligation	$58,613,000

COMMITMENTS_AND_CONTINGENCIES_3

COMMITMENTS AND CONTINGENCIES (Details 1) (Supplier Agreements, USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Supplier Agreements
Commitments and Contingencies [Line Items]
2015	$11,431
2016	15,670
2017	21,662
2018	1,025
2019	2,740
2020 and beyond	6,085
Contractual obligation	$58,613

FOREIGN_OPERATIONS_Details

FOREIGN OPERATIONS (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic area	$207,343	$157,368
Long-lived assets at December 31	176,497	131,087
US
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic area	118,966	88,995
Long-lived assets at December 31	126,762	73,462
ITALY
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic area	56,547	39,959
Long-lived assets at December 31	38,172	46,510
UK
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic area	27,092	23,481
Long-lived assets at December 31	9,840	11,109
OTHER
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic area	4,738	4,933
Long-lived assets at December 31	$1,723	$6