Note 5 - Fair Value - Quantitative Information about Inputs and Valuation Methodologies Used for Fair Value Measurements Classification (Details) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($) yr $ / shares	Dec. 31, 2020 USD ($) yr $ / shares
Senhance Surgical Robotic System Acquisition [Member] \| Fair Value, Inputs, Level 3 [Member] \| Minimum [Member] \| Milestone Date, Year [Member]
Contingent consideration, measurement input	2,020	2,024
Senhance Surgical Robotic System Acquisition [Member] \| Fair Value, Inputs, Level 3 [Member] \| Minimum [Member] \| Measurement Input, Discount Rate [Member]
Contingent consideration, measurement input	0.10	0.095
Senhance Surgical Robotic System Acquisition [Member] \| Fair Value, Inputs, Level 3 [Member] \| Maximum [Member] \| Milestone Date, Year [Member]
Contingent consideration, measurement input	2,024	2,029
Senhance Surgical Robotic System Acquisition [Member] \| Fair Value, Inputs, Level 3 [Member] \| Maximum [Member] \| Measurement Input, Discount Rate [Member]
Contingent consideration, measurement input	0.11	0.1575
Series B Warrant [Member]
Fair value (million) \| $	$ 2.4	$ 0.3
Share price (in dollars per share) \| $ / shares	$ 1.47	$ 0.63
Probability of additional financing	100.00%
Series B Warrant [Member] \| Measurement Input, Expected Term [Member]
Warrants, measurement input (Year) \| yr	2.32	1.32
Series B Warrant [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants, measurement input (Year)	0.0159	0.0010
Series B Warrant [Member] \| Measurement Input, Expected Dividend Payment [Member]
Warrants, measurement input (Year)	0	0
Series B Warrant [Member] \| Measurement Input, Price Volatility [Member]
Warrants, measurement input (Year)	1.0980	1.5097

Represents the estimated fair value of the warrant liability as of the balance sheet date.

No definition available.

Name:	asxc_EstimatedFairValueOfWarrantLiability
Namespace Prefix:	asxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the probability of additional financing next twelve months, used as a fair value input.

+ References

No definition available.

+ Details

Name:	asxc_FairValueInputsProbabilityOfAdditionalFinancingNextTwelveMonths
Namespace Prefix:	asxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of input used to measure contingent consideration liability from business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=asxc_SenhanceSurgicalRoboticSystemAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=asxc_MilestoneDateYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=asxc_SeriesBWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedDividendPaymentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: