Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net sales	$ 40,709us-gaap_SalesRevenueGoodsNet	$ 23,162us-gaap_SalesRevenueGoodsNet
Cost of sales	8,930us-gaap_CostOfGoodsSold	5,252us-gaap_CostOfGoodsSold
Gross profit	31,779us-gaap_GrossProfit	17,910us-gaap_GrossProfit
Operating expenses:
Distributor commissions	18,397us-gaap_SalesCommissionsAndFees	10,423us-gaap_SalesCommissionsAndFees
Selling, general and administrative expenses (including stock-based compensation expense of $25 and $15 during the three months ended March 31, 2014 and 2015, respectively)	6,423	4,347
Depreciation and amortization	41	21
Total operating expenses	24,861us-gaap_OperatingExpenses	14,791us-gaap_OperatingExpenses
Income from operations	6,918us-gaap_OperatingIncomeLoss	3,119us-gaap_OperatingIncomeLoss
Other expense, net	(109)us-gaap_OtherNonoperatingIncomeExpense	(9)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	6,809	3,110
Income tax provision	71us-gaap_IncomeTaxExpenseBenefit	39us-gaap_IncomeTaxExpenseBenefit
Net income	6,738us-gaap_NetIncomeLoss	3,071us-gaap_NetIncomeLoss
Preferred stock dividends		(4)us-gaap_DividendsPreferredStock
Net income available to common stockholders	$ 6,738	$ 3,067
Income per common share:
Basic (in dollars per share)	$ 0.54us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.54us-gaap_EarningsPerShareDiluted	$ 0.26us-gaap_EarningsPerShareDiluted
Common (in dollars per share)	$ 0.02	$ 0.005
Series A preferred stock (in dollars per share)		$ 0.815
Weighted-average number of common shares outstanding:
Basic (in shares)	12,453	11,361
Diluted (in shares)	12,548	11,673

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