Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities
Net loss	$ (38,595)	$ (17,436)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	9,234	8,441
Deferred income taxes	438	409
Bad debt expense and other reserves	118	153
Stock-based compensation	20,978	5,584
Increase in fair value of contingent consideration liability		71
Common stock warrant expense	8,343	2,888
Imputed interest on notes receivable	(3)	93
Interest income on notes receivable	(1)	49
Interest expense on note payable		805
Accretion of beneficial conversion feature on convertible notes payable and discount on revolving line of credit	236	987
Loss on disposal of fixed assets	243	734
Changes in operating assets and liabilities
Accounts receivable	(10,407)	(4,858)
Prepaid expenses	(2,695)	(3,319)
Other current assets	(601)	(304)
Other assets	(30)	(327)
Accounts payable	3,332	3,019
Accrued employee expenses	(479)	468
Other accrued expenses	5,128	(3,095)
Other liabilities	(143)	(238)
Net cash used in operating activities	(4,904)	(5,876)
Cash flows from investing activities
Change in restricted cash	2,000	2,500
Purchase of property and equipment	(12,324)	(5,508)
Purchase of intangible assets	(365)
Notes receivable from related parties	(60)
Repayment of notes receivable from related parties	3,761	228
Net cash used in investing activities	(6,988)	(2,780)
Cash flows from financing activities
Proceeds from initial public offering, net of underwriting discounts	69,702
Proceeds from revolving line of credit	5,000	5,000
Repayments under credit agreement	(5,000)
Payment of contingent consideration		(428)
Repurchase of vested common stock option awards		(2,000)
Proceeds from exercise of common stock options	1,909	210
Exercise of warrants	9,461
Net cash provided by financing activities	81,072	2,782
Net increase (decrease) in cash and cash equivalents	69,180	(5,874)
Cash and cash equivalents at beginning of period	43,819	22,062
Cash and cash equivalents at end of period	112,999	16,188
Supplemental disclosures of non-cash activities
Recognition of construction in progress and related lease financing obligation	5,970
Stock-based compensation capitalized for software development	947	366
Capitalized assets included in accounts payable, accrued employee expenses and other accrued expenses	471	143
Conversion of convertible note payable and accrued interest to common stock		25,447
Deferred offering costs included in accounts payable and accrued expenses	$ 58