Original and Further Restatement of the Consolidated Financial Statements - Effects of Further Restatements of Consolidated Statement of Operations and Comprehensive Loss (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Product sales	$ 88,296ofix_RevenueFromProductSales	$ 80,037ofix_RevenueFromProductSales	$ 265,175ofix_RevenueFromProductSales	$ 256,207ofix_RevenueFromProductSales
Marketing service fees	12,698ofix_MarketServiceRevenue	11,769ofix_MarketServiceRevenue	36,818ofix_MarketServiceRevenue	35,518ofix_MarketServiceRevenue
Net sales	100,994us-gaap_SalesRevenueNet	91,806us-gaap_SalesRevenueNet	301,933us-gaap_SalesRevenueNet	291,725us-gaap_SalesRevenueNet
Cost of sales	25,268us-gaap_CostOfGoodsAndServicesSold	25,064us-gaap_CostOfGoodsAndServicesSold	77,455us-gaap_CostOfGoodsAndServicesSold	72,789us-gaap_CostOfGoodsAndServicesSold
Gross profit	75,726us-gaap_GrossProfit	66,742us-gaap_GrossProfit	224,538us-gaap_GrossProfit	218,936us-gaap_GrossProfit
Operating expenses
Sales and marketing	40,998us-gaap_SellingAndMarketingExpense	39,076us-gaap_SellingAndMarketingExpense	124,182us-gaap_SellingAndMarketingExpense	129,459us-gaap_SellingAndMarketingExpense
General and administrative	18,814us-gaap_GeneralAndAdministrativeExpense	12,933us-gaap_GeneralAndAdministrativeExpense	53,643us-gaap_GeneralAndAdministrativeExpense	46,355us-gaap_GeneralAndAdministrativeExpense
Research and development	6,572us-gaap_ResearchAndDevelopmentExpense	6,361us-gaap_ResearchAndDevelopmentExpense	18,818us-gaap_ResearchAndDevelopmentExpense	20,653us-gaap_ResearchAndDevelopmentExpense
Amortization of intangible assets	508us-gaap_AmortizationOfIntangibleAssets	616us-gaap_AmortizationOfIntangibleAssets	1,753us-gaap_AmortizationOfIntangibleAssets	1,725us-gaap_AmortizationOfIntangibleAssets
Costs related to the accounting review and restatement	2,326	2,664	12,959	2,664
Impairment of goodwill		19,193us-gaap_GoodwillImpairmentLoss		19,193us-gaap_GoodwillImpairmentLoss
Total operating expenses	69,218us-gaap_OperatingExpenses	80,843us-gaap_OperatingExpenses	211,355us-gaap_OperatingExpenses	220,049us-gaap_OperatingExpenses
Operating income (loss)	6,508us-gaap_OperatingIncomeLoss	(14,101)us-gaap_OperatingIncomeLoss	13,183us-gaap_OperatingIncomeLoss	(1,113)us-gaap_OperatingIncomeLoss
Other income and expense
Interest expense, net	(395)us-gaap_InterestExpense	(539)us-gaap_InterestExpense	(1,355)us-gaap_InterestExpense	(1,536)us-gaap_InterestExpense
Other expense	(1,322)us-gaap_OtherNonoperatingIncomeExpense	(1,481)us-gaap_OtherNonoperatingIncomeExpense	(1,231)us-gaap_OtherNonoperatingIncomeExpense	2,076us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense)	(1,717)us-gaap_NonoperatingIncomeExpense	(2,020)us-gaap_NonoperatingIncomeExpense	(2,586)us-gaap_NonoperatingIncomeExpense	540us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes	4,791	(16,121)	10,597	(573)
Income tax expense	(4,763)us-gaap_IncomeTaxExpenseBenefit	(383)us-gaap_IncomeTaxExpenseBenefit	(9,251)us-gaap_IncomeTaxExpenseBenefit	(7,993)us-gaap_IncomeTaxExpenseBenefit
Net loss from continuing operations	28	(16,504)	1,346	(8,566)
Discontinued operations (Note 15)
Loss from discontinued operations	260	(2,375)	(6,363)	(14,427)
Income tax benefit	164	43	2,278	4,593
Net loss from discontinued operations	424	(2,332)	(4,085)	(9,834)
Net loss	452us-gaap_NetIncomeLoss	(18,836)us-gaap_NetIncomeLoss	(2,739)us-gaap_NetIncomeLoss	(18,400)us-gaap_NetIncomeLoss
Net loss per common share-basic:
Net loss from continuing operations, net of tax		$ (0.91)	$ 0.07	$ (0.45)
Net loss from discontinued operations, net of tax	$ 0.02	$ (0.13)	$ (0.22)	$ (0.52)
Net loss per common share-basic	$ 0.02us-gaap_EarningsPerShareBasic	$ (1.04)us-gaap_EarningsPerShareBasic	$ (0.15)us-gaap_EarningsPerShareBasic	$ (0.97)us-gaap_EarningsPerShareBasic
Net loss per common share-diluted:
Net loss from continuing operations, net of tax		$ (0.91)	$ 0.07	$ (0.45)
Net loss from discontinued operations, net of tax	$ 0.02	$ (0.13)	$ (0.22)	$ (0.52)
Net loss per common share-diluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ (1.04)us-gaap_EarningsPerShareDiluted	$ (0.15)us-gaap_EarningsPerShareDiluted	$ (0.97)us-gaap_EarningsPerShareDiluted
Weighted average number of common shares:
Basic	18,577,540	18,142,935	18,408,238	18,897,887
Diluted	18,773,386	18,142,935	18,564,522	18,897,887
Comprehensive loss	(2,738)us-gaap_ComprehensiveIncomeNetOfTax	(15,047)us-gaap_ComprehensiveIncomeNetOfTax	(5,283)us-gaap_ComprehensiveIncomeNetOfTax	(18,097)us-gaap_ComprehensiveIncomeNetOfTax
Previously Reported [Member]
Product sales		81,061		259,030
Marketing service fees		11,677		35,361
Net sales		92,738		294,391
Cost of sales		23,920		69,783
Gross profit		68,818		224,608
Operating expenses
Sales and marketing		42,382		132,346
General and administrative		13,202		46,736
Research and development		6,361		20,653
Amortization of intangible assets		616		1,725
Costs related to the accounting review and restatement		2,664		2,664
Impairment of goodwill		19,193		19,193
Total operating expenses		84,418		223,317
Operating income (loss)		(15,600)		1,291
Other income and expense
Interest expense, net		(555)		(1,585)
Other expense		(1,481)		2,076
Total other income (expense)		(2,036)		491
Income (loss) before income taxes		(17,636)		1,782
Income tax expense		(448)		(8,126)
Net loss from continuing operations		(18,084)		(6,344)
Discontinued operations (Note 15)
Loss from discontinued operations		(3,041)		(16,629)
Income tax benefit		1,303		5,334
Net loss from discontinued operations		(1,738)		(11,295)
Net loss		(19,822)		(17,639)
Net loss per common share-basic:
Net loss from continuing operations, net of tax		$ (1.00)		$ (0.34)
Net loss from discontinued operations, net of tax		$ (0.10)		$ (0.60)
Net loss per common share-basic		$ (1.10)		$ (0.94)
Net loss per common share-diluted:
Net loss from continuing operations, net of tax		$ (1.00)		$ (0.34)
Net loss from discontinued operations, net of tax		$ (0.10)		$ (0.60)
Net loss per common share-diluted		$ (1.10)		$ (0.94)
Weighted average number of common shares:
Basic		18,142,935		18,897,887
Diluted		18,142,935		18,897,887
Comprehensive loss		(16,064)		(17,426)
Further Restatement Adjustments [Member]
Product sales		(1,024)		(2,823)
Marketing service fees		92		157
Net sales		(932)		(2,666)
Cost of sales		1,144		3,006
Gross profit		(2,076)		(5,672)
Operating expenses
Sales and marketing		(3,306)		(2,887)
General and administrative		(269)		(381)
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Impairment of goodwill
Total operating expenses		(3,575)		(3,268)
Operating income (loss)		1,449		(2,404)
Other income and expense
Interest expense, net		16		49
Other expense
Total other income (expense)		16		49
Income (loss) before income taxes		1,515		(2,355)
Income tax expense		65		133
Net loss from continuing operations		1,580		(2,222)
Discontinued operations (Note 15)
Loss from discontinued operations		666		2,202
Income tax benefit		(1,260)		(741)
Net loss from discontinued operations		594		1,461
Net loss		986		(761)
Net loss per common share-basic:
Net loss from continuing operations, net of tax		$ 0.09		$ (0.11)
Net loss from discontinued operations, net of tax		$ (0.03)		$ 0.08
Net loss per common share-basic		$ 0.06		$ (0.03)
Net loss per common share-diluted:
Net loss from continuing operations, net of tax		$ 0.09		$ (0.11)
Net loss from discontinued operations, net of tax		$ (0.03)		$ 0.08
Net loss per common share-diluted		$ 0.06		$ (0.03)
Weighted average number of common shares:
Basic
Diluted
Comprehensive loss		$ 1,017		$ (671)

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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