CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Revenue	$ 141,254	$ 111,594	$ 90,918
Cost of goods sold	24,418	17,947	14,770
Gross profit	116,836	93,647	76,148
Operating expenses:
Research and development	12,323	9,380	10,751
Sales and marketing	87,506	67,676	51,846
General and administrative	27,720	18,915	14,825
Total operating expenses	127,549	95,971	77,422
Operating loss	(10,713)	(2,324)	(1,274)
Other operating income (expense):
Other income (expense)	2,037	(771)	(987)
Interest income	27	10	26
Interest expense	(878)	(3,273)	(3,240)
Accretion related to warrants and discounts on long-term debt	(20)	(6,900)	(1,404)
Expense related to beneficial conversion of promissory notes	0	(7,413)	0
Change in fair value of common stock warrants	0	(5,593)	(1,643)
Total other income (expense), net	1,166	(23,940)	(7,248)
Loss before income taxes	(9,547)	(26,264)	(8,522)
Income tax expense	(1,430)	(1,671)	(1,179)
Net loss	(10,977)	(27,935)	(9,701)
Other comprehensive loss:
Foreign currency translation	(3,698)	655	742
Comprehensive loss	$ (14,675)	$ (27,280)	$ (8,959)
Net loss per common share:
Basic and diluted (in dollars per share)	$ (0.43)	$ (3.09)	$ (2.10)
Weighted average number of shares outstanding:
Basic and diluted (in shares)	25,288,284	9,040,567	4,615,352