Debt instrument, convertible outstanding principal.

No definition available.

Name:	mtcr_DebtInstrumentConvertibleOutstandingPrincipal
Namespace Prefix:	mtcr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Debt instrument incremental additional amount of debt.

+ References

No definition available.

+ Details

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

- Definition

Debt instrument, initial maturity date.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Debt instrument variable rate.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Gross proceeds from issuance of common stock.

+ References

No definition available.

+ Details

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

- Definition

Maximum value of common stock available for issuance.

+ References

No definition available.

+ Details

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

- 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

Sale of stock, agent compensation percentage.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Sale of stock, agreement date.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtcr_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Shares issued weighted average price per share.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtcr_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Warrants expiration date.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtcr_
Data Type:	xbrli:dateItemType
Balance Type:	na
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=123467817&loc=d3e21475-112644

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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

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
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+ Details

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Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of stock transaction which may include details of the offering (IPO, private placement), a description of the stock sold, percentage of subsidiary's or equity investee's stock sold, a description of the investors and whether the stock was issued in a business combination.

+ References

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

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Period Type:	duration

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Subsequent Events - Additional Information (Details) - USD ($)				9 Months Ended
	Nov. 05, 2021	Oct. 04, 2021	Oct. 01, 2021	Sep. 30, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Long-term debt				$ 10,000,000	$ 10,000,000
First Tranche Term Loan
Subsequent Event [Line Items]
Debt instrument, maturity date				Sep. 01, 2023
Second Amendment
Subsequent Event [Line Items]
Long-term debt				$ 10,000,000.0
Second Amendment \| Subsequent Event
Subsequent Event [Line Items]
Loan agreement date			Oct. 01, 2021
Loan, maximum borrowing capacity			$ 45,000,000.0
Incremental additional debt			5,000,000.0
Debt instrument, convertible outstanding principal			$ 3,000,000.0
Debt instrument, convertible, conversion price			$ 3.86
Second Amendment \| Subsequent Event \| Lender Warrant
Subsequent Event [Line Items]
Number of preferred stock shares initially exercisable upon funding of first tranche term loan			375,000
Percentage of preferred shares issuable on aggregate term loans upon exercise of warrant			2.50%
Warrant exercise price per share			$ 2.86
Warrant expiration date			Oct. 01, 2031
Second Amendment \| First Tranche Term Loan \| Subsequent Event
Subsequent Event [Line Items]
Long-term debt			$ 15,000,000.0
Second Amendment \| Interest-Only Period \| Subsequent Event
Subsequent Event [Line Items]
Debt instrument, initial maturity date			Jul. 01, 2023
Debt instrument, maturity date			Jan. 01, 2024
Second Amendment \| Minimum \| Subsequent Event
Subsequent Event [Line Items]
Debt instrument, variable rate			7.75%
Second Amendment \| Prime Rate
Subsequent Event [Line Items]
Debt instrument, variable rate			4.50%
Sales Agreement \| Subsequent Event \| At-The-Market Offering \| SVB Leerink LLC
Subsequent Event [Line Items]
Sale of stock under sales agreement, description		The Company has no obligation to sell any shares of common stock under the Sales Agreement and may at any time suspend solicitation and offers under the Sales Agreement.
Sale of stock, agreement date		Oct. 04, 2021
Sale of stock, agent compensation percentage		3.00%
Common stock value available for future issuance		$ 50,000,000.0
Number of shares sold in transaction	857,819
Weighted average price of shares sold	$ 1.41
Gross proceeds before deducting underwriter commissions and other offering costs	$ 1,200,000