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Summarizes Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | $ 15,796 | $ 7,090
Provision related to current period sales | 71,318 | 37,944
Provision related to prior period sales | (489) | (244)
Credits/payments made for current period sales | (40,110) | (25,143)
Credits/payments made for prior period sales | (14,203) | (6,383)
Ending balance | 32,312 | 13,264
Trade Receivables |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 4,296 | 2,207
Provision related to current period sales | 15,823 | 10,104
Provision related to prior period sales | (87) | (174)
Credits/payments made for current period sales | (11,086) | (6,729)
Credits/payments made for prior period sales | (4,180) | (2,043)
Ending balance | 4,766 | 3,365
Rebates Chargebacks And Discounts |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 9,881 | 3,610
Provision related to current period sales | 46,553 | 21,633
Provision related to prior period sales | (402) | (70)
Credits/payments made for current period sales | (22,236) | (14,194)
Credits/payments made for prior period sales | (8,492) | (3,522)
Ending balance | 25,304 | 7,457
Allowance for Sales Returns |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 535 | 481
Provision related to current period sales | 403 | 231
Credits/payments made for prior period sales | (247) | (26)
Ending balance | 691 | 686
Other Incentive Programs |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 1,084 | 792
Provision related to current period sales | 8,539 | 5,976
Credits/payments made for current period sales | (6,788) | (4,220)
Credits/payments made for prior period sales | (1,284) | (792)
Ending balance | $ 1,551 | $ 1,756

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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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