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Note 1 - Organization, Description of Business and Summary of Significant Accounting Policies (Details Textual)				3 Months Ended			6 Months Ended		12 Months Ended
	May 13, 2020 USD ($)	May 07, 2019 USD ($) $ / shares shares	Dec. 28, 2018 USD ($)	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Dec. 31, 2019 USD ($)
Number of Operating Segments							1
Number of Disease Areas with Genomic Testing				4			4
Stock Issued During Period, Shares, New Issues (in shares) | shares		6,325,000
Sale of Stock, Price Per Share (in dollars per share) | $ / shares		$ 23.25
Proceeds from Issuance of Common Stock		$ 137,800,000					$ 0	$ 137,848,000
Payments of Stock Issuance Costs		$ 9,200,000
Restricted Cash and Cash Equivalents, Noncurrent, Total				$ 603,000			603,000		$ 603,000
Revenue from Contract with Customer, Excluding Assessed Tax, Total				20,704,000	$ 30,136,000		51,826,000	59,665,000
Operating Income (Loss), Total				$ (11,051,000)	$ (3,100,000)		$ (23,251,000)	$ (5,167,000)
Earnings Per Share, Basic and Diluted, Total (in dollars per share) | $ / shares				$ (0.22)	$ (0.05)		$ (0.45)	$ (0.10)
Inventory Write-down							$ 1,088,000	$ 0
Loxo Oncology Inc [Member] | Collaborative Arrangement [Member]
Contract Agreement, Term (Year)							1 year
Contract Agreement, Automatic Renewal Term (Year)							1 year
Contract Agreement, Termination Period (Day)							90 days
Contract with Customer, Liability, Revenue Recognized							$ 0		0
Johnson and Johnson Services Inc JJSI [Member] | Collaborative Arrangement [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total				$ 1,300,000
Contract with Customer, Liability, Revenue Recognized							0		0
Collaborative Agreement, Amount			$ 7,000,000.0
Collaborative Agreement, Contingent Receivable Amount			$ 13,000,000.0
Collaborative Agreement, Period of Payments After First Commercial (Year)			10 years
Collaborative Agreement, Fee Percentage of Cash Collections			1.00%
Accounts Receivable, after Allowance for Credit Loss, Total				500,000			500,000		2,000,000.0
Acerta Pharma BV [Member] | Collaborative Arrangement [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total				200,000			400,000
Accounts Receivable, after Allowance for Credit Loss, Total				1,400,000			1,400,000
Revenue from Achievement of Development Milestones				1,000,000.0
CareDx [Member] | Collaborative Arrangement [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total				1,000,000.0
Accounts Receivable, after Allowance for Credit Loss, Total				0			0
Contract with Customer, Liability, Total	$ 1,000,000.0			0			0
Commercial Development Agreement, Maximum Payments Receivable from Counter Party Upon Achievement of Milestones	4,500,000
Value of Support Services to Counter Party	$ 500,000
Testing [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total				15,212,000	$ 26,686,000		42,203,000	52,075,000
Testing [Member] | Cost of Sales [Member] | COVID 19 Pandemic [Member]
Inventory Write-down				1,100,000
Testing [Member] | Revenue Recognition [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total				900,000	100,000		700,000	800,000
Operating Income (Loss), Total				$ 900,000	$ 100,000		$ 700,000	$ 800,000
Earnings Per Share, Basic and Diluted, Total (in dollars per share) | $ / shares				$ 20,000.00	$ 0.01		$ 0.01	$ 0.02
Collaborative [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total				$ 0			$ 0
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total				1,713,000	$ 0		5,122,000	$ 0
Product [Member] | Loxo Oncology Inc [Member] | Collaborative Arrangement [Member]
Contract with Customer, Liability, Revenue Recognized					0	$ 90,000	0
Service [Member] | Loxo Oncology Inc [Member] | Collaborative Arrangement [Member]
Contract with Customer, Liability, Revenue Recognized				$ 250,000			$ 500,000
Percepta v2 [Member] | Johnson and Johnson Services Inc JJSI [Member] | Collaborative Arrangement [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total					1,200,000			5,000,000.0
Fulfillment of Obligations Relating to Percepta v.2 Development Milestones [Member] | Johnson and Johnson Services Inc JJSI [Member] | Collaborative Arrangement [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total					$ 2,000,000.0
Overnight Reverse Repurchase Agreements [Member]
Cash Equivalents, Percentage Collateralized by US Treasury and Agency Securities				102.00%			102.00%
Cash Equivalents, at Carrying Value, Total				$ 0			$ 0
Collateral for Irrevocable Standby Letter of Credit [Member]
Restricted Cash and Cash Equivalents, Noncurrent, Total				$ 603,000			$ 603,000		$ 603,000
Over-Allotment Option [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares		825,000
Revision of Prior Period, Adjustment [Member]
Increase (Decrease) in Operating Capital, Total								$ 431,000

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- Definition

The number of disease areas with genomic testing.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

The amount of revenue recognized for achievement of development milestones.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The value of support services to the counter party pursuant to the agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	vcyt_
Data Type:	xbrli:monetaryItemType
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- Details

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- Details

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- Details

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Balance Type:
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X

- Details

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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

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- Details

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Balance Type:
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- Details

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Balance Type:
Period Type:

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_ProductMember
Namespace Prefix:
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Balance Type:
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X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_ServiceMember
Namespace Prefix:
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- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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- Details

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Balance Type:
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- Details

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