Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities
Net income (loss)	$ 54,455	$ 23,503	$ (4,257)
Adjustment to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	12,796	10,427	3,740
Write-off of deferred financing costs from early payoff of debt	0	1,443	0
Share-based compensation	11,111	6,758	3,285
Provision for doubtful accounts	231	46	(28)
Accretion of marketable securities	323	0	0
Change in fair value of warrant liabilities	0	(3,117)	8,658
Change in fair value of embedded derivative	0	2,785	0
Deferred income tax benefit	(37,612)	(14,185)	0
Other	21	5	5
Change in operating assets and liabilities:
Trade and other receivables	(3,127)	(2,766)	(1,067)
Prepaid expenses and other current assets	(1,080)	1,334	(901)
Other non-current assets	328	(1,305)	(287)
Accounts payable	518	(2,945)	1,677
Accrued expenses and other liabilities	6,920	5,913	542
Deferred revenue	28,115	20,782	13,440
Other non-current liabilities	4,374	(255)	(463)
Net cash provided by operating activities	77,373	48,423	24,344
Investing activities
Acquisition of businesses, net of cash acquired	(42,369)	(157,430)
Acquisition of property and equipment	(10,417)	(7,498)	(2,031)
Purchase of marketable securities	(50,775)
Sale and maturities of marketable securities	1,353
Decrease in restricted cash	0	1,748	500
Net cash used in investing activities	(102,208)	(163,180)	(1,531)
Proceeds from:
Term loan	0	68,000	0
Initial public offering, net of offering costs	0	125,663	0
Issuance of convertible redeemable preferred stock, net of offering costs	0	102,165	0
Issuance of warrants	0	4,373	0
Stock based compensation plans	15,425	298	1,752
Payments for:
Term loan	0	(68,000)
Revolving line of credit	0	0	(13,010)
Obligations under capital lease	0	0	(154)
Payments to Series E-1 convertible redeemable preferred stockholders	0	(10,719)	0
Employee tax withholdings related to restricted stock units	(436)	0	0
Debt issuance costs	(440)	(1,676)	(132)
Net cash provided by (used in) financing activities	14,549	220,104	(11,544)
Net increase (decrease) in cash and cash equivalents	(10,286)	105,347	11,269
Cash and cash equivalents at beginning of year	134,197	28,850	17,581
Cash and cash equivalents at end of year	123,911	134,197	28,850
Cash paid during the period for:
Interest	267	1,836	316
Income taxes	1,121	518	94
Supplemental information for non-cash investing activities:
Accrued capital expenditures	1,300	127	0
Supplemental information for non-cash financing activities:
Convertible redeemable preferred stock issued as part of purchase price for ID Analytics	0	11,542	0
Preferred stock embedded derivative issued as part of purchase price for ID Analytics	$ 0	$ 7,934	$ 0