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Summarize Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | $ 27,198 | $ 15,796
Provision related to current period sales | 124,571 | 71,318
Provision related to prior period sales | (1,220) | (489)
Credits/payments made for current period sales | (82,300) | (40,110)
Credits/payments made for prior period sales | (21,623) | (14,203)
Ending balance | 46,626 | 32,312
Trade Allowances |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 3,743 | 4,296
Provision related to current period sales | 24,780 | 15,823
Provision related to prior period sales | (297) | (87)
Credits/payments made for current period sales | (11,061) | (11,086)
Credits/payments made for prior period sales | (3,107) | (4,180)
Ending balance | 14,058 | 4,766
Rebates, Chargebacks and Discounts |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 20,915 | 9,881
Provision related to current period sales | 87,499 | 46,553
Provision related to prior period sales | (841) | (402)
Credits/payments made for current period sales | (62,014) | (22,236)
Credits/payments made for prior period sales | (16,722) | (8,492)
Ending balance | 28,837 | 25,304
Product Returns |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 859 | 535
Provision related to current period sales | 1,496 | 403
Credits/payments made for current period sales | (391) |
Credits/payments made for prior period sales | (24) | (247)
Ending balance | 1,940 | 691
Other Incentives |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 1,681 | 1,084
Provision related to current period sales | 10,796 | 8,539
Provision related to prior period sales | (82) |
Credits/payments made for current period sales | (8,834) | (6,788)
Credits/payments made for prior period sales | (1,770) | (1,284)
Ending balance | $ 1,791 | $ 1,551

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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 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + 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 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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