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Summarizes Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | $ 7,090 | $ 2,469
Provision related to current period and deferred sales | 21,968 | 10,720
Provision related to prior period sales | (157) | 12
Credits/payments made for current period and deferred sales | (12,202) | (7,601)
Credits/payments made for prior period sales | (6,376) | (1,836)
Ending balance | 10,323 | 3,764
Allowance for Trade Receivables |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 2,207 | 1,071
Provision related to current period and deferred sales | 6,044 | 3,325
Provision related to prior period sales | (113) |
Credits/payments made for current period and deferred sales | (3,810) | (2,082)
Credits/payments made for prior period sales | (2,039) | (926)
Ending balance | 2,289 | 1,388
Rebates Chargebacks And Discounts |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 3,610 | 1,137
Provision related to current period and deferred sales | 11,957 | 4,978
Provision related to prior period sales | (44) |
Credits/payments made for current period and deferred sales | (6,243) | (3,301)
Credits/payments made for prior period sales | (3,531) | (910)
Ending balance | 5,749 | 1,904
Allowance for Sales Returns |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 481 | 72
Provision related to current period and deferred sales | 276 | 163
Provision related to prior period sales |  | 12
Credits/payments made for prior period sales | (14) |
Ending balance | 743 | 247
Other Incentive Programs |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 792 | 189
Provision related to current period and deferred sales | 3,691 | 2,254
Credits/payments made for current period and deferred sales | (2,149) | (2,218)
Credits/payments made for prior period sales | (792) |
Ending balance | $ 1,542 | $ 225

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- Definition 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. + References 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 + Details
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- Definition 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. + References 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 + Details
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