Revenue recognition - Costs to obtain a contract (Details) $ in Thousands	9 Months Ended
Sep. 30, 2019 USD ($)
Change in the balance of costs to obtain a contract
606 adoption adjustment	$ 307
Deferral of costs to obtain a contract	636
Recognition of costs to obtain a contract	(635)
Balance at end of period	$ 308

Effect to capitalized contract costs due to adoption adjustment.

No definition available.

Name:	qtrx_CapitalizedContractCostAdoptionAdjustment
Namespace Prefix:	qtrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Decrease in capitalized contract costs due to deferral of costs to obtain a contract.

+ References

No definition available.

+ Details

Name:	qtrx_CapitalizedContractCostDeferralOfCostsToObtainContract
Namespace Prefix:	qtrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Addition of capitalized contract costs due to recognition of costs to obtain a contract.

+ References

No definition available.

+ Details

Name:	qtrx_CapitalizedContractCostRecognitionOfCostsToObtainContract
Namespace Prefix:	qtrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

+ Details

Name:	us-gaap_CapitalizedContractCostNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant