Debt instrument, acceleration of maturity of debt, threshold amount.

No definition available.

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Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument final payment fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtcr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument final payment fee percentage.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Debt instrument prepayment fee percentage.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Debt instrument variable rate.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Percentage of preferred shares issuable on term loans upon exercise of warrant.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Warrants expiration date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:dateItemType
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Period Type:	duration

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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Balance Type:	debit
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ References

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Balance Type:	na
Period Type:	duration

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

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Balance Type:	na
Period Type:	duration

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

+ Details

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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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Balance Type:	na
Period Type:	duration

- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ References

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- Definition

Description of a subjective acceleration clause that is a part of the debt instrument. A subjective acceleration clause is a provision in a debt agreement that states that the creditor may accelerate the scheduled maturities of the obligation under conditions that are not objectively determinable (for example, if the debtor fails to maintain satisfactory operations or if a material adverse change occurs).

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

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-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-03.8)
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of financial and nonfinancial obligations.

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
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- Details

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- Details

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- Details

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Long-Term Debt - Additional Information (Details) - USD ($)		3 Months Ended		12 Months Ended
	Aug. 27, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt		$ 10,000,000		$ 10,000,000
Lender Warrant
Debt Instrument [Line Items]
Warrant to purchase number of shares of common stock upon completion of IPO		23,122
Lender Warrant \| Series C Convertible Preferred Stock
Debt Instrument [Line Items]
Warrant exercise price per share		$ 10.812
Warrant expiration date		Aug. 27, 2029
Percentage of preferred shares issuable on aggregate term loans upon exercise of warrant		2.50%
Number of preferred stock shares initially exercisable upon funding of first tranche term loan		117,924
Fair value of liabilities	$ 200,000
Term Loans
Debt Instrument [Line Items]
Loan agreement date	Aug. 27, 2019
Long-term debt	$ 10,000,000	$ 10,000,000		10,000,000
Debt instrument, interest rate terms		The Term Loan bears interest at a floating annual rate equal to the greater of (i) the prime rate used by the Lender plus 2% (5.25% at March 31, 2021 and December 31, 2020, respectively), and (ii) 7.25%.
Debt instrument, payment terms		The monthly payments are interest-only until September 1, 2022. Subsequent to the interest-only period, the Term Loan will be payable in equal monthly installments of principal plus accrued and unpaid interest, through the maturity date of September 1, 2023 (“Maturity Date”).
Debt instrument, frequency of periodic payment		monthly
Debt instrument, final payment fee percentage		5.25%
Debt instrument, final payment fee		$ 500,000		$ 500,000
Debt instrument, prepayment fee percentage		3.00%		3.00%
Debt instrument, subjective acceleration clause		The Loan Agreement includes customary affirmative and negative covenants and also includes standard events of default, including an event of default based on the occurrence of a material adverse event, and a default under any agreement with a third party resulting in a right of such third party to accelerate the maturity of any debt in excess of $0.3 million.
Debt instrument, acceleration of maturity of debt, threshold amount		$ 300,000
Debt instrument, covenant compliance		As of March 31, 2021 and December 31, 2020, the Company was in compliance with all applicable covenants under the Loan Agreement.
Debt issuance costs	$ 300,000
Debt interest expense		$ 200,000	$ 300,000
Debt discount amortization		100,000	$ 100,000
Accrued interest		$ 100,000		$ 100,000
Term Loans \| Prime Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.00%
Debt instrument, variable rate		5.25%		5.25%
Term Loans \| Minimum
Debt Instrument [Line Items]
Debt instrument, variable rate		7.25%
Term Loans \| Maximum
Debt Instrument [Line Items]
Debt instrument, prepayment fee percentage		3.00%
First Tranche Term Loan
Debt Instrument [Line Items]
Debt instrument, maturity date		Sep. 01, 2023