Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net loss	$ (7,340)	$ (4,895)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,886	1,113
Income tax provision	80	49
Non-cash interest expense (income)	(1)	192
Change in fair value of conversion option liability	0	(70)
Share‑based compensation	1,936	478
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(1,720)	(733)
Prepaid expenses and other assets	419	(175)
Deferred revenue, including long-term portion	2,003	2,332
Accounts payable	(130)	951
Accrued expenses and other	(463)	(1,347)
Net cash used in operating activities	(3,330)	(2,105)
Cash flows from investing activities
Purchases of property and equipment, including software development costs	(1,552)	(80)
Acquisitions of businesses, net of cash acquired	0	(989)
Net cash used in investing activities	(1,552)	(1,069)
Cash flows from financing activities
Principal payments on loan payable	(4)	(250)
Payments on capital leases	(195)	0
Proceeds from debt issuances	0	6,930
Proceeds from exercise of options and warrants	595	0
Deferred finance and offering costs	0	(375)
Net cash provided by financing activities	396	6,305
Effect of changes in foreign exchange rates on cash and cash equivalents	10	0
Net increase (decrease) in cash and cash equivalents	(4,476)	3,131
Cash and cash equivalents, beginning of period	77,130	1,890
Cash and cash equivalents, end of period	72,654	5,021
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	43	147
Assets acquired under capital lease	0	553
Deferred offering and financing costs	0	253
Issuance of common stock upon conversion of debentures	0	11,005
Redeemable Preferred Stock, Series A-1 [Member]
Supplemental Cash Flow Information [Abstract]
Accretion	0	1,074
Redeemable Non-Controlling Interest [Member]
Supplemental Cash Flow Information [Abstract]
Accretion	$ 94	$ 71