Summarizes Activity of the Product Revenue Allowance and Reserve Categories (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	$ 3,830
Credits/payments made for current period and deferred sales	(2,382)
Balance at June 30, 2013	1,448
Allowance for Trade Receivables
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	1,654
Credits/payments made for current period and deferred sales	(1,053)
Balance at June 30, 2013	601
Rebates Chargebacks And Discounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	1,009
Credits/payments made for current period and deferred sales	(460)
Balance at June 30, 2013	549
Allowance for Sales Returns
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	72
Balance at June 30, 2013	72
Other Incentive Programs
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision related to current period and deferred sales	1,095
Credits/payments made for current period and deferred sales	(869)
Balance at June 30, 2013	$ 226

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 FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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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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