Stockholders' Equity - Schedule of Stock Options Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Range of Exercise Price, lower range limit	$ 0.40	$ 40
Range of Exercise Price, upper range limit	$ 2.99	$ 2.99
Number of Options Outstanding	234,167	279,167
Weighted Average Exercise Price	$ 2.47	$ 2.25
Number of Options Exercisable	234,167	279,167
Weighted Average Exercise Price	$ 2.47	$ 2.25
Exercise Price Range One [Member]
Range of Exercise Price, lower range limit	0.80	80
Range of Exercise Price, upper range limit	$ 0.99	$ 99
Number of Options Outstanding	70,000	78,750
Weighted Average Exercise Price	$ 0.87	$ 0.88
Number of Options Exercisable	70,000	78,750
Weighted Average Exercise Price	$ 0.87	$ 0.88
Exercise Price Range Two [Member]
Range of Exercise Price, lower range limit	1.00	1.00
Range of Exercise Price, upper range limit	$ 1.99	$ 1.99
Number of Options Outstanding	45,000	81,250
Weighted Average Exercise Price	$ 1.60	$ 1.40
Number of Options Exercisable	45,000	81,250
Weighted Average Exercise Price	$ 1.60	$ 1.40
Exercise Price Range Three [Member]
Range of Exercise Price, lower range limit	2.00	2.00
Range of Exercise Price, upper range limit	$ 2.99	$ 2.99
Number of Options Outstanding	42,500	42,500
Weighted Average Exercise Price	$ 2.48	$ 2.48
Number of Options Exercisable	42,500	42,500
Weighted Average Exercise Price	$ 2.48	$ 2.48
Exercise Price Range Four [Member]
Range of Exercise Price, lower range limit	3.00	3.00
Range of Exercise Price, upper range limit	$ 3.99	$ 3.99
Number of Options Outstanding	25,000	25,000
Weighted Average Exercise Price	$ 3.50	$ 3.50
Number of Options Exercisable	25,000	25,000
Weighted Average Exercise Price	$ 3.50	$ 3.50
Exercise Price Range Five [Member]
Range of Exercise Price, lower range limit	4.00	4.00
Range of Exercise Price, upper range limit	$ 4.99	$ 4.99
Number of Options Outstanding	25,000	25,000
Weighted Average Exercise Price	$ 4.25	$ 4.25
Number of Options Exercisable	25,000	25,000
Weighted Average Exercise Price	$ 4.25	$ 4.25
Exercise Price Range Six [Member]
Range of Exercise Price, lower range limit	5.00	5.00
Range of Exercise Price, upper range limit	$ 5.99	$ 5.99
Number of Options Outstanding	26,667	26,667
Weighted Average Exercise Price	$ 5.50	$ 5.50
Number of Options Exercisable	26,667	26,667
Weighted Average Exercise Price	$ 5.50	$ 5.50

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=VTSI_ExercisePriceRangeOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=VTSI_ExercisePriceRangeTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=VTSI_ExercisePriceRangeThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=VTSI_ExercisePriceRangeFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=VTSI_ExercisePriceRangeFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=VTSI_ExercisePriceRangeSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: