Summarizes Activity of the Product Revenue Allowance and Reserve Categories (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	$ 2,234
Credits/payments made for current period and deferred sales	(779)
Balance at March 31, 2013	1,455
Allowance for Trade Receivables
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	1,073
Credits/payments made for current period and deferred sales	(566)
Balance at March 31, 2013	507
Rebates Chargebacks And Discounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	259
Credits/payments made for current period and deferred sales	(3)
Balance at March 31, 2013	256
Allowance for Sales Returns
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	72
Balance at March 31, 2013	72
Other Incentive Programs
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	830
Credits/payments made for current period and deferred sales	(209)
Balance at March 31, 2013	$ 620

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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