Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Revenue, net
Direct	$ 33,592		$ 35,681		$ 104,854		$ 113,873
Fulfillment partner	319,399		265,745		921,889		792,751
Total net revenue	352,991		301,426		1,026,743		906,624
Cost of goods sold
Direct	29,385	[1]	30,777	[1]	91,955	[1]	99,768	[1]
Fulfillment partner	256,548		211,499		741,109		630,931
Total cost of goods sold	285,933		242,276		833,064		730,699
Gross profit	67,058		59,150		193,679		175,925
Operating expenses:
Sales and marketing	25,428	[1]	22,463	[1]	72,363	[1]	60,376	[1]
Technology	22,202	[1]	17,259	[1]	63,211	[1]	53,339	[1]
General and administrative	17,073	[1]	15,970	[1]	48,250	[1]	47,643	[1]
Restructuring	0		0		(360)		(471)
Total operating expenses	64,703		55,692		183,464		160,887
Operating income	2,355		3,458		10,215		15,038
Interest income	36		34		114		100
Interest expense	(11)		(33)		(30)		(121)
Other income (expense), net	(350)		165		633		360
Income before income taxes	2,030		3,624		10,932		15,377
Provision for income taxes	413		91		3,436		449
Net income	1,617		3,533		7,496		14,928
Net income per common share—basic:
Net income attributable to common shares-basic (in dollars per share)	$ 0.07		$ 0.15		$ 0.31		$ 0.63
Weighted average common shares outstanding-basic (in shares)	24,027		23,766		23,988		23,692
Net income per common share—diluted:
Net income attributable to common shares-diluted (in dollars per share)	$ 0.07		$ 0.14		$ 0.31		$ 0.61
Weighted average common shares outstanding-diluted (in shares)	24,283		24,446		24,290		24,297
Comprehensive income	$ 1,617		$ 3,533		$ 7,496		$ 14,928

[1] (1) Includes stock-based compensation as follows (Note 7): Cost of goods sold — direct $45 $37 $130 $117 Sales and marketing 77 44 255 123 Technology 183 33 550 235 General and administrative 693 695 2,014 1,902 Total $998 $809 $2,949 $2,377