Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net loss	$ (13,408)	$ (25,258)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,848	2,407
Depreciation, Depletion and Amortization 2		2,391
Income tax provision	160	191
Non-cash interest expense (income)	(1)	1,697
Change in fair value of conversion option liability	0	(152)
Share‑based compensation	3,766	10,567
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(1,618)	(1,028)
Prepaid expenses and other assets	105	(421)
Deferred revenue, including long-term portion	5,317	4,134
Accounts payable	582	(59)
Accrued expenses and other	220	(1,239)
Net cash used in operating activities	(1,029)	(9,177)
Increase (Decrease) in Restricted Cash	0	230
Cash flows from investing activities
Purchases of property and equipment, including software development costs	(3,625)	(738)
Acquisitions of businesses, net of cash acquired	0	(989)
Net cash used in investing activities	(3,625)	(1,957)
Proceeds from Affiliate's Investment in Joint Venture	0	199
Cash flows from financing activities
Principal payments on loan payable	(99)	(251)
Payments on capital leases	(397)	(93)
Proceeds from debt issuances	0	6,930
Repayments of Long-term Debt	0	(7,964)
Proceeds from exercise of options and warrants	1,552	411
Payment to Acquire Non-controlling Interest	(1,563)	0
Deferred finance and offering costs	0	(399)
Proceeds from Issuance of Common Stock	0	79,677
Payments for Repurchase of Common Stock	(4,096)	(600)
Net cash provided by financing activities	(4,603)	77,910
Effect of changes in foreign exchange rates on cash and cash equivalents	5	(39)
Net increase (decrease) in cash and cash equivalents	(9,252)	66,737
Cash and cash equivalents, beginning of period	77,130	1,890
Cash and cash equivalents, end of period	67,878	68,627
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	78	292
Accretion	199	146
Assets acquired under capital lease	0	553
Deferred offering and financing costs	0	253
Issuance of common stock upon conversion of debentures	0	16,784
Reclassification of Preferred Stock Warrant Liability to Additional Paid-in Capital	0	46,684
Noncash Adjustment, Conversion of Preferred Stock to Common Stock	0	7,282
Reclassification of Redeemable Common Stock to Common Stock	0	7,898
Fair Value Adjustment, Reclassification of Warrants to Equity	0	435
Redeemable Preferred Stock, Series A-1 [Member]
Supplemental Cash Flow Information [Abstract]
Accretion	0	3,384
Redeemable Non-Controlling Interest [Member]
Supplemental Cash Flow Information [Abstract]
Accretion	$ 199	$ 146