Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net loss	$ (7,827)us-gaap_ProfitLoss	$ (5,302)us-gaap_ProfitLoss
Adjustments to reconcile net loss including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	8,054us-gaap_Depreciation	5,784us-gaap_Depreciation
Amortization of intangible assets	893us-gaap_AmortizationOfIntangibleAssets	925us-gaap_AmortizationOfIntangibleAssets
Loss on disposal of fixed assets	91us-gaap_GainLossOnDispositionOfAssets
Stock-based compensation	1,835us-gaap_ShareBasedCompensation	1,517us-gaap_ShareBasedCompensation
Change in fair value of contingent consideration	(114)	(378)
Change in deferred income taxes	122us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:
Accounts receivable	(4,477)	(1,719)
Prepaid expenses and other assets	199	13
Accounts payable	4,490	(156)
Accrued expenses and other liabilities	(2,221)	(291)
Deferred revenue	11,430	7,678
Net cash provided by operating activities	12,475	8,071
Cash flows from investing activities
Purchases of marketable securities		(22,682)
Proceeds from sales of marketable securities	1,614	18,358
Purchases of property and equipment	(16,600)	(16,004)
Net cash used in investing activities	(14,986)	(20,328)
Cash flows from financing activities
Proceeds from credit facility	5,000us-gaap_ProceedsFromLinesOfCredit
Proceeds from exercise of stock options	290	95
Principal payments on debt	(219)us-gaap_RepaymentsOfBankDebt
Payments of capital leases and notes payable	(97)	(180)
Payment of other acquisition related consideration		(275)
Payments of withholding tax on net issuance of restricted stock units	(679)	(586)
Payments to non-controlling interests		(619)us-gaap_PaymentsToMinorityShareholders
Net cash provided by (used in) financing activities	4,295	(1,565)
Effect of Exchange Rate on Cash
Effect of exchange rates on cash	(14)us-gaap_EffectOfExchangeRateOnCash
Net increase (decrease) in cash and cash equivalents	1,770	(13,822)
Cash and cash equivalents at beginning of period	8,849	27,338
Cash and cash equivalents at end of period	10,619	13,516
Supplemental disclosure of non-cash investing and financing activities
Property and equipment costs in accounts payable, accrued expenses and other liabilities	9,868	8,483
Acquisition of equipment under capital leases	$ 2,297us-gaap_CapitalLeaseObligationsIncurred

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.