Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Healthcare	$ 155,989	$ 135,140	$ 112,905
Commuter	61,776	59,579	51,817
COBRA	31,996	15,047	8,157
Other	18,071	9,512	4,403
Total revenue	267,832	219,278	177,282
Operating expenses:
Cost of revenues (excluding amortization of internal use software)	100,226	81,918	64,647
Technology and development	27,741	21,459	18,849
Sales and marketing	44,940	34,676	30,341
General and administrative	42,884	37,637	28,839
Amortization and change in contingent consideration	20,992	11,612	15,674
Total operating expenses	236,783	187,302	158,350
Income from operations	31,049	31,976	18,932
Other income (expense):
Interest income	5	17	36
Interest expense	(1,612)	(1,339)	(1,772)
Gain on revaluation of warrants			381
Other income	743	248	48
Income before income taxes	30,185	30,902	17,625
Income tax provision	(11,943)	(9,203)	(7,126)
Net income	18,242	21,699	10,499
Accretion of redemption premium expense			(2,301)
Net income attributable to common stockholders	$ 18,242	$ 21,699	$ 8,198
Basic net income per share	$ 0.52	$ 0.65	$ 0.45
Diluted net income per share	$ 0.50	$ 0.62	$ 0.33
Shares used in basic net income per share calculations	35,145	33,626	18,138
Shares used in diluted net income per share calculations	36,330	35,277	24,414