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Intangible assets | 9 Months Ended
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Sep. 30, 2018
Intangible assets [Abstract] |
Intangible assets | 7. Intangible assets During the three months ended September 30, 2018 and 2017, the Company recorded amortization expense for intangible assets of $3.9 million and $1.6 million, respectively. During the nine months ended September 30, 2018 and 2017, the Company recorded amortization expense for intangible assets of $11.7 million and $4.7 million, respectively. Amortization expense has been recorded in operating expenses, specifically selling, general and administrative and cost of product sales and contract manufacturing. As of September 30, 2018, the weighted average amortization period remaining for intangible assets was 8.2 years.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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