The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Portfolio’s performance. A higher portfolio turnover rate may indicate higher transaction costs. During the most recent fiscal period, the Portfolio’s turnover rate was 28% of the average value of its portfolio.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The operating expenses in this fee table will not correlate to the expense ratio in the Portfolio's financial highlights because the financial statements include only the direct operating expenses incurred by the Portfolio.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies:

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

The Portfolio employs a fund-of-funds structure that invests, under normal market conditions, at least 80% of its assets in exchange-traded funds ("ETFs").

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

As with all mutual funds, there is the risk that you could lose money through your investment in the Portfolio. Many factors affect the Portfolio’s net asset value (“NAV”) and performance.

The following principal risks apply to the Portfolio. Many of these risks come from the Portfolio’s investments in ETFs. The value of your investment in the Portfolio will go up and down with the prices of the securities in which the Portfolio invests.

• Credit Risk: Issuers might not make payments on debt securities, resulting in losses. Credit quality of securities may be lowered if an issuer’s financial condition changes, also resulting in losses.

• Duration Risk: Longer-term securities may be more sensitive to interest rate changes. Given the recent, historically low interest rates and the potential for increases in those rates, a heightened risk is posed by rising interest rates to a fund whose portfolios include longer-term fixed income securities.

• Emerging Markets Risk: In addition to the risks generally associated with investing in securities of foreign companies, countries with emerging markets also may have relatively unstable governments, social and legal systems that do not protect shareholders, economies based on only a few industries, and securities markets that trade a small number of issues.

• ETF Risk: The cost of investing in the Portfolio will be higher than the cost of investing directly in ETFs and may be higher than other mutual funds that invest directly in stocks and bonds. ETF shares may trade at a discount or premium to their NAV. Because the value of ETF shares depends on the demand in the market, the adviser may not be able to liquidate the Portfolio's holdings at the most optimal time, adversely affecting performance. ETFs in which a Portfolio invests will not be able to replicate exactly the performance of the indices they track, if any, because the total return generated by the securities will be reduced by transaction costs incurred in adjusting the actual balance of the securities. In addition, the ETFs in which the Portfolio invests will incur expenses not incurred by their applicable indices. Each ETF is subject to specific risks, depending on the nature of the fund.

• Interest Rate Risk: The value of bonds and other fixed income securities will fluctuate with changes in interest rates. Typically, a rise in interest rates causes a decline in the value of fixed income securities. Recently, interest rates have been historically low. Current conditions may result in a rise in interest rates, which in turn may result in a decline in the value of the fixed income investments held by the Portfolio. As a result, for the present, interest rate risk may be heightened.

• Foreign Currency Risk: Foreign equity securities denominated in non-US dollar currencies will subject the Portfolio to currency trading risks that include market risk and country risk. Market risk results from adverse changes in exchange rates. Country risk arises because a government may interfere with transactions in its currency.

• Foreign Investment Risk: Foreign investing involves risks not typically associated with U.S. investments, including adverse fluctuations in foreign currency values, adverse political, social and economic developments, less liquidity, greater volatility, less developed or less efficient trading markets, political instability and differing auditing and legal standards.

• Fund of Funds Risk: The Portfolio’s principal investment strategy involves investing in ETFs. Investors may be able to invest directly in the ETFs and may not need to invest through the Portfolio. The cost of investing directly in the Portfolio may be higher than the cost of investing directly in the ETFs. Investors of the Portfolio will indirectly bear fees and expenses charged by the ETFs in which the Portfolio invests in addition to the Portfolio’s direct fees and expenses. The Portfolio will incur brokerage costs when it purchases shares of investment companies.

• Junk Bond Risk: Lower-quality bonds, known as “high yield” or “junk” bonds, present greater risk than bonds of higher quality, including an increased risk of default. An economic downturn or period of rising interest rates could adversely affect the market for these bonds and the Portfolio’s ETFs holding these bonds. The lack of a liquid market for these bonds could decrease the Portfolio’s share price.

• Liquidity Risk: Liquidity risk exists when particular investments are difficult to purchase or sell. This can reduce the Portfolio’s returns because the Portfolio may be unable to transact at advantageous times or prices. Recently, interest rates have been historically low. Current conditions may result in a rise in interest rates, and a potential rise in interest rates may result in periods of volatility and increased redemptions. As a result of increased redemptions, the Portfolio may have to liquidate portfolio securities at disadvantageous prices and times, which could reduce the returns of the Portfolio. The reduction in dealer market-making capacity in the fixed income markets that has occurred in recent years also has the potential to decrease liquidity.

• Management Risk: The adviser’s dependence on the TOPS® methodology and judgments about the attractiveness, value and potential appreciation of particular asset classes and securities in which the Portfolio invests may prove to be incorrect and may not produce the desired results.

• Market Risk: Overall securities market risks may affect the value of individual ETFs. Factors such as foreign and domestic economic growth and market conditions, interest rate levels, and political events may adversely affect the securities markets.

• Market and Geopolitical Risk: The increasing interconnectivity between global economies and financial markets increases the likelihood that events or conditions in one region or financial market may adversely impact issuers in a different country, region or financial market. Securities in the Portfolio may underperform due to inflation (or expectations for inflation), interest rates, global demand for particular products or resources, natural disasters, pandemics, epidemics, terrorism, regulatory events and governmental or quasi-governmental actions. The occurrence of global events similar to those in recent years, such as terrorist attacks around the world, natural disasters, social and political discord or debt crises and downgrades, among others, may result in market volatility and may have long term effects on both the U.S. and global financial markets. It is difficult to predict when similar events affecting the U.S. or global financial markets may occur, the effects that such events may have and the duration of those effects. Any such event(s) could have a significant adverse impact on the value and risk profile of the Portfolio. The current novel coronavirus (COVID-19) global pandemic and the aggressive responses taken by many governments, including closing borders, restricting international and domestic travel, and the imposition of prolonged quarantines or similar restrictions, as well as the forced or voluntary closure of, or operational changes to, many retail and other businesses, has had negative impacts, and in many cases severe negative impacts, on markets worldwide. It is not known how long such impacts, or any future impacts of other significant events described above, will or would last, but there could be a prolonged period of global economic slowdown, which may impact your Portfolio investment. Therefore, the Portfolio could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. During a general market downturn, multiple asset classes may be negatively affected. Changes in market conditions and interest rates can have the same impact on all types of securities and instruments. In times of severe market disruptions you could lose your entire investment.

• Model Risk: The adviser’s TOPS® methodology utilized in the Portfolio’s securities selection process is not certain to produce improved issuer creditworthiness, maximized returns or minimized risk, and may not be appropriate for every investor. No assurance can be given that the Portfolio will be successful under all or any market conditions.

• Natural Resource Risk: Exposure to companies primarily engaged in the natural resource markets (which for this purpose includes agribusiness) may subject the Portfolio to greater volatility than the securities market as a whole. Natural resource companies are affected by commodity price volatility, changes in interest rates, or factors affecting a particular industry or commodity, such as drought, floods, weather, livestock disease, embargoes, tariffs, and international economic, political and regulatory developments.

• Portfolio Turnover Risk: The Portfolio may have a high portfolio turnover (100% or more) which could result in greater transaction costs, lower Portfolio performance and higher tax liability for shareholders.

• Preferred Stock Risk: The value of preferred stocks will fluctuate with changes in interest rates. Typically, a rise in interest rates causes a decline in the value of preferred stock. Preferred stocks are also subject to credit risk, which is the possibility that an issuer of preferred stock will fail to make its dividend payments.

• Real Estate Risk: Real estate values rise and fall in response to a variety of factors, including local, regional and national economic conditions, interest rates and tax considerations. REIT ETF performance depends on the types and locations of the properties owned by the relevant REITs and on how well those REITs manage those properties.

• Small and Medium Capitalization Stock Risk: The value of a small or medium capitalization company stocks may be subject to more abrupt or erratic market movements than those of larger, more established companies or the market averages in general.

Before investing in the Portfolio, you should carefully consider your own investment goals, the amount of time you are willing to leave your money invested, and the amount of risk you are willing to take.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance:

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart and performance table below show the variability of the Portfolio's returns, which is some indication of the risks of investing in the Portfolio.

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

You should be aware that the Portfolio's past performance (before and after taxes) may not be an indication of how the Portfolio will perform in the future.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best Quarter:	1^st Quarter 2019	5.35%
Worst Quarter:	4^th Quarter 2018	(3.81)%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2019

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.81%)

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Reflects no deduction for fees and expenses

1 Year

rr_AverageAnnualReturnYear01

31.49%

Since Inception

rr_AverageAnnualReturnSinceInception

12.95%

^[2]

Prospectus [Line Items]

rr_ProspectusLineItems

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.12%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 41

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

224

1 Year

rr_AverageAnnualReturnYear01

12.03%

Since Inception

rr_AverageAnnualReturnSinceInception

4.22%

^[2]

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.10%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.18%

^[3]

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.65%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

208

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 810

Annual Return 2013

rr_AnnualReturn2013

4.57%

Annual Return 2015

rr_AnnualReturn2015

(2.09%)

Annual Return 2017

rr_AnnualReturn2017

6.83%

Annual Return 2019

rr_AnnualReturn2019

11.70%

5 Years

rr_AverageAnnualReturnYear05

3.77%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 26, 2011

Prospectus [Line Items]

rr_ProspectusLineItems

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.12%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 92

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

498

1 Year

rr_AverageAnnualReturnYear01

11.35%

^[5]

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 26, 2011

^[5]

Prospectus [Line Items]

rr_ProspectusLineItems

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.12%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 72

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

390

Risk/Return [Heading]

rr_RiskReturnHeading

PORTFOLIO SUMMARY: TOPS Balanced ETF Portfolio

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Portfolio seeks income and capital appreciation.

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the annual operating expenses that you may indirectly pay if you invest in the Portfolio through your retirement plan or if you allocate your insurance contract premiums or payments to the Portfolio. However, each insurance contract and separate account involves fees and expenses that are not described in this Prospectus. If the fees and expenses of your insurance contract or separate account were included in this table, your overall expenses would be higher. You should review the insurance contract prospectus for a complete description of fees and expenses. In the table below, Acquired Fund Fees and Expenses are the indirect costs of investing in other investment companies.

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover:

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

37.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. You would pay the same expenses if you did not redeem your shares. However, each insurance contract and separate account involves fees and expenses that are not included in the Example. If these fees and expenses were included in the Example, your overall expenses would be higher. The Example also assumes that your investment has a 5% return each year and that the Portfolio's operating expenses remain the same. Although your actual costs may be higher or lower, based upon these assumptions your costs would be:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Portfolio employs a fund-of-funds structure that invests, under normal market conditions, at least 80% of its assets in exchange-traded funds (“ETFs”). The ETFs included in the Portfolio invest primarily in securities representing one of the following asset classes:

• Government Fixed Income Securities

• Corporate Fixed Income Securities

• Common and Preferred Stocks

• Real Estate-Related Securities (“REITs”)

• Natural Resource-Related Securities

The Portfolio restricts investment in fixed income ETFs to those with an average maturity of 20 years or less and invests primarily in ETFs with average portfolio credit quality of investment grade. Maturity is the time between when a fixed income security is issued and when it matures. No more than 15% of the portfolio will be allocated to fixed income ETFs with an average portfolio credit quality below investment grade (commonly referred to as “junk bond” credit quality). The Portfolio defines investment grade credit quality as Baa3 or higher by Moody’s Investors Service or BBB- or higher by Standard and Poor’s Rating Group. The Portfolio invests in ETFs that may invest in securities without restriction as to underlying issuer country (including foreign and emerging countries), capitalization or currency. The Portfolio considers emerging market countries to be those represented in the MSCI Emerging Markets Index. The Portfolio invests in REIT ETFs and natural resource ETFs without restriction as to underlying issuer capitalization.

The Portfolio’s adviser seeks to achieve the Portfolio’s investment objectives by allocating assets and selecting individual ETFs using the adviser’s TOPS® (The Optimized Portfolio System) methodology. The TOPS® methodology utilizes multiple asset classes in an effort to enhance performance and/or reduce risk (as measured by return volatility). Under normal market conditions, the Portfolio invests at least 25% of its assets in equity ETFs and at least 25% of its assets in fixed income ETFs. However, to achieve the Portfolio’s income aspect of the Portfolio’s investment objectives, the adviser allocates approximately 50% of Portfolio assets to fixed income ETFs. To achieve the capital appreciation aspect of the Portfolio’s investment objectives, the adviser allocates approximately 50% of Portfolio assets to a combination of equity ETFs, REIT ETFs and natural resource ETFs. Furthermore, the adviser selects some equity ETFs that are composed of value stocks. The adviser expects value stocks (those with a lower than average price-to-earnings ratio) to have returns that are less volatile than the equity market as a whole.

The adviser selects individual ETFs that it believes are reasonably representative of an asset class and have relatively low expenses and/or relatively high returns when compared to a peer group of ETFs. The adviser may sell individual ETFs to rebalance asset allocation or to purchase a substitute ETF with a higher expected return or lower risk profile or for any other reason.

The Portfolio’s adviser seeks to enhance the efficiency of trade execution by employing a sub-adviser to execute security trades. The sub-adviser has some discretion on which securities to trade and when in the day to conduct the trade, subject to the adviser’s oversight.

The Portfolio and the adviser have received a Securities and Exchange Commission order that allows the adviser to hire a new sub-adviser or sub-advisers without shareholder approval.

There is no guarantee that the Portfolio will meet its investment objectives.

Who Should Invest in the Portfolio?

The adviser believes the Portfolio is appropriate for investors with short-term to intermediate-term investment horizons who seek capital preservation as well as the opportunity for modest income and modest capital appreciation.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks:

Risk Lose Money [Text]

rr_RiskLoseMoney

As with all mutual funds, there is the risk that you could lose money through your investment in the Portfolio.

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The bar chart and performance table below show the variability of the Portfolio’s returns, which is some indication of the risks of investing in the Portfolio. The bar chart shows performance of the Class 2 shares of the Portfolio for each full calendar year since the Portfolio’s inception. The performance table compares the performance of the share classes of the Portfolio over time to the performance of a broad-based securities market index. You should be aware that the Portfolio’s past performance (before and after taxes) may not be an indication of how the Portfolio will perform in the future. Updated performance information is available at no cost by calling 1-855-572-5945.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1-855-572-5945

Bar Chart [Heading]

rr_BarChartHeading

Class 2 Annual Total Return for Calendar Years Ended December 31

^[1]

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

7.64%

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2018

Performance Table Heading

rr_PerformanceTableHeading

Performance Table Average Annual Total Returns (For periods ended December 31, 2019)

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The Standard and Poor’s 500 Index is an unmanaged market capitalization-weighted index of 500 of the largest capitalized U.S. domiciled companies. Index returns assume reinvestment of dividends. Its performance does not reflect any deduction for fees, management expenses or taxes. An investor cannot invest directly in an index.

Prospectus [Line Items]

rr_ProspectusLineItems

5 Years

rr_AverageAnnualReturnYear05

11.70%

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.10%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.14%

^[3]

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.34%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

109

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 431

5 Years

rr_AverageAnnualReturnYear05

5.26%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 26, 2011

Prospectus [Line Items]

rr_ProspectusLineItems

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.10%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 60

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

329

Annual Return 2012

rr_AnnualReturn2012

11.86%

Annual Return 2014

rr_AnnualReturn2014

3.54%

Annual Return 2016

rr_AnnualReturn2016

7.91%

Annual Return 2018

rr_AnnualReturn2018

(5.62%)

1 Year

rr_AverageAnnualReturnYear01

15.93%

Since Inception

rr_AverageAnnualReturnSinceInception

5.11%

^[6]

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.10%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.14%

^[3]

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.84%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

268

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,037

Since Inception

rr_AverageAnnualReturnSinceInception

5.09%

^[5],[6]

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.10%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.44%

^[3]

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.64%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

205

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 798

Prospectus [Line Items]

rr_ProspectusLineItems

Objective [Heading]

rr_ObjectiveHeading

Investment Objectives:

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Portfolio:

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Portfolio’s performance. A higher portfolio turnover rate may indicate higher transaction costs. During the most recent fiscal year, the Portfolio’s turnover rate was 39% of the average value of its portfolio.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The operating expenses in this fee table will not correlate to the expense ratio in the Portfolio's financial highlights because the financial statements include only the direct operating expenses incurred by the Portfolio.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies:

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

The Portfolio employs a fund-of-funds structure that invests, under normal market conditions, at least 80% of its assets in exchange-traded funds ("ETFs").

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

As with all mutual funds, there is the risk that you could lose money through your investment in the Portfolio. Many factors affect the Portfolio’s net asset value (“NAV”) and performance.

The following principal risks apply to the Portfolio. Many of these risks come from the Portfolio’s investments in ETFs. The value of your investment in the Portfolio will go up and down with the prices of the securities in which the Portfolio invests.

• Credit Risk: Issuers might not make payments on debt securities, resulting in losses. Credit quality of securities may be lowered if an issuer’s financial condition changes, also resulting in losses.

• Duration Risk: Longer-term securities may be more sensitive to interest rate changes. Given the recent, historically low interest rates and the potential for increases in those rates, a heightened risk is posed by rising interest rates to a fund whose portfolios include longer-term fixed income securities.

• Emerging Market Risk: In addition to the risks generally associated with investing in securities of foreign companies, countries with emerging markets also may have relatively unstable governments, social and legal systems that do not protect shareholders, economies based on only a few industries, and securities markets that trade a small number of issues.