Fair Value - Quantitative Information about Inputs and Valuation Methodologies Used for Fair Value Measurements Classification (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	12 Months Ended
Apr. 28, 2017	Mar. 31, 2018	Dec. 31, 2017
Senhance Surgical Robotic System Acquisition [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Contingent Consideration [Member]
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Probability of occurrence		100.00%
Senhance Surgical Robotic System Acquisition [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Contingent Consideration [Member] \| Minimum [Member]
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Milestone dates		2018
Discount rate		7.50%
Senhance Surgical Robotic System Acquisition [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Contingent Consideration [Member] \| Maximum [Member]
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Milestone dates		2020
Discount rate		12.00%
Series B Warrant [Member]
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Estimated fair value of warrants	$ 6.2	$ 11.7	$ 14.1
Valuation methodology	Black- Scholes Merton	Monte Carlo	Monte Carlo
Fair value input, term	5 years	4 years 29 days	4 years 3 months 29 days
Fair value input, risk free rate	1.81%	2.48%	2.13%
Fair value input, volatility	73.14%	85.60%	80.60%
Share price	$ 0.65	$ 1.70	$ 1.93
Probability of additional financing in 2018		25.00%	25.00%
Probability of additional financing in 2019		75.00%	75.00%

Estimated fair value of warrant liability.

No definition available.

Name:	trxc_EstimatedFairValueOfWarrantLiability
Namespace Prefix:	trxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value inputs, probability of additional financing next twelve months.

+ References

No definition available.

+ Details

Name:	trxc_FairValueInputsProbabilityOfAdditionalFinancingNextTwelveMonths
Namespace Prefix:	trxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value inputs, probability of additional financing year two.

+ References

No definition available.

+ Details

Name:	trxc_FairValueInputsProbabilityOfAdditionalFinancingYearTwo
Namespace Prefix:	trxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value inputs, probability of occurrence.

+ References

No definition available.

+ Details

Name:	trxc_FairValueInputsProbabilityOfOccurrence
Namespace Prefix:	trxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value inputs year of payments.

+ References

No definition available.

+ Details

Name:	trxc_FairValueInputsYearOfPayments
Namespace Prefix:	trxc_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents the annual disclosure of the methods and significant assumptions used to estimate the fair value of items for which the fair value option has been elected. This disclosure would not reflect the disclosure of the methodology and assumptions for items otherwise required to be reported at fair value and, therefore, for which the fair value option has not been elected or is not applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14210-108612

+ Details

Name:	us-gaap_FairValueOptionMethodologyAndAssumptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

- Details

Name:	us-gaap_BusinessAcquisitionAxis=trxc_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:	us-gaap_FairValueByLiabilityClassAxis=trxc_ContingentConsiderationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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