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Amount of expense related to chargebacks during the period.

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Revenue to be recognized upon satisfaction of performance obligation.

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Sales discount, goods, percentage.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Indicates type of revenue from product and service. Includes, but is not limited to, revenue from contract with customer and other sources.

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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenue Recognition Milestone Method [Line Items]
License fees and consulting revenue	$ 19,364	$ 18,428	$ 66,868	$ 67,829
Revenue recognition cash discount percentage	2.30%		2.30%
Provision for chargebacks and other deductions total	$ 19,909		$ 19,909		$ 13,101
General settlement period for rebates and fees			Settlement of rebates and fees may generally occur from one to five months from date of sale.
Deferred revenue	20,071		$ 20,071		190
Out-license Revenue
Revenue Recognition Milestone Method [Line Items]
Deferred revenue	20,000		20,000
Commercial Platform
Revenue Recognition Milestone Method [Line Items]
Provision for chargebacks and other deductions total	19,900		19,900		13,100
Chargebacks and other deductions expense	20,400	11,400	59,800	24,300
Oncology Innovation Platform
Revenue Recognition Milestone Method [Line Items]
Revenue to be recognized upon satisfaction of performance obligation	20,000		20,000
Oncology Innovation Platform \| Out-license Revenue
Revenue Recognition Milestone Method [Line Items]
Deferred revenue	20,000		20,000
Global Supply Chain Platform
Revenue Recognition Milestone Method [Line Items]
Revenue to be recognized upon satisfaction of performance obligation	100		100
Global Supply Chain Platform \| Out-license Revenue
Revenue Recognition Milestone Method [Line Items]
Deferred revenue	100		100		$ 200
Transferred at a Point in Time
Revenue Recognition Milestone Method [Line Items]
License fees and consulting revenue	$ 0	$ 5,000	$ 0	$ 30,000
Type of Revenue [Extensible List]	atnx:LicenseForIntellectualPropertyMember	atnx:LicenseForIntellectualPropertyMember	atnx:LicenseForIntellectualPropertyMember	atnx:LicenseForIntellectualPropertyMember
Transferred at a Point in Time \| Commercial Platform
Revenue Recognition Milestone Method [Line Items]
License fees and consulting revenue	$ 12,006	$ 7,315	$ 38,279	$ 23,006
Transferred at a Point in Time \| Oncology Innovation Platform
Revenue Recognition Milestone Method [Line Items]
License fees and consulting revenue	115	5,117	421	30,532
Transferred at a Point in Time \| Global Supply Chain Platform
Revenue Recognition Milestone Method [Line Items]
License fees and consulting revenue	$ 7,243	$ 5,996	$ 28,168	$ 14,291