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Summarize Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | $ 48,093 | $ 27,198
Provision related to current period sales | 45,860 | 30,426
Provision related to prior period sales | (704) | (1,082)
Credits/payments made for current period sales | (13,161) | (4,416)
Credits/payments made for prior period sales | (24,651) | (20,262)
Ending balance | 55,437 | 31,864
Trade Allowances |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 12,035 | 3,743
Provision related to current period sales | 8,506 | 6,621
Provision related to prior period sales | (200) | (298)
Credits/payments made for current period sales | (875) | (2,357)
Credits/payments made for prior period sales | (1,336) | (3,107)
Ending balance | 18,130 | 4,602
Rebates, Chargebacks and Discounts |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 32,064 | 20,915
Provision related to current period sales | 32,947 | 19,670
Provision related to prior period sales | (435) | (702)
Credits/payments made for current period sales | (10,487) | (727)
Credits/payments made for prior period sales | (20,994) | (15,376)
Ending balance | 33,095 | 23,780
Product Returns |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 1,887 | 859
Provision related to current period sales | 222 | 1,028
Credits/payments made for prior period sales | (25) | (9)
Ending balance | 2,084 | 1,878
Other Incentives |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 2,107 | 1,681
Provision related to current period sales | 4,185 | 3,107
Provision related to prior period sales | (69) | (82)
Credits/payments made for current period sales | (1,799) | (1,332)
Credits/payments made for prior period sales | (2,296) | (1,770)
Ending balance | $ 2,128 | $ 1,604

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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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