Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
Sep. 30, 2016 USD ($)	Jun. 30, 2015 USD ($) item	Mar. 31, 2015 USD ($)
Contingent payment liability		$ 5,000	$ 5,000
GSK
Minimum notice period required to terminate contract		30 days
Contingent payment liability		$ 5,000
Number of specified events needed to occur to trigger contingent payment \| item		1
Number of possible specified events to trigger payment of contingent liability \| item		3
Threshold time period to determine if contingent payment will be made		6 months
GSK \| Forecast
Contingent payment	$ 5,000

Deferred payment payable upon certain criteria relating to an asset purchase agreement.

No definition available.

Name:	axon_ContingentPaymentLiability
Namespace Prefix:	axon_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the number of potential specified events to trigger the contingent payment.

No definition available.

Name:	axon_ContingentPaymentNumberOfPossibleSpecifiedEventsToTriggerPayment
Namespace Prefix:	axon_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of specified events that need to occur to trigger the contingent payment.

No definition available.

Name:	axon_ContingentPaymentNumberOfSpecifiedEventsNeededToTriggerPayment
Namespace Prefix:	axon_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents minimum notice period required to terminate the contract.

No definition available.

Name:	axon_MinimumNoticePeriodRequiredToTerminateContract
Namespace Prefix:	axon_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The cash outflow for payments of contingent liability.

No definition available.

Name:	axon_PaymentsOfContingentLiability
Namespace Prefix:	axon_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the threshold period of time to determine if a contingent payment will be made under an agreement.

No definition available.

Name:	axon_ThresholdTimePeriodToDetermineIfContingentPaymentWillBeMade
Namespace Prefix:	axon_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_CounterpartyNameAxis=axon_GskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: