Total cash and cash equivalents and marketable investments at fair market value.

No definition available.

Name:	cutr_CashAndCashEquivalentsAndMarketableInvestmentsFairMarketValue
Namespace Prefix:	cutr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Total cash, cash equivalents and marketable investments at amortized cost.

+ References

No definition available.

+ Details

Name:	cutr_CashCashEquivalentsAndMarketableInvestmentsAmortizedCost
Namespace Prefix:	cutr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

+ Details

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

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 2 - Investment Securities - Unrealized Gains and Losses Related to Marketable Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash and cash equivalents, Amortized Cost	$ 26,316	$ 26,052	$ 14,184	$ 13,775
Cash and cash equivalents, Fair Market Value	26,316	26,052
Marketable investments, Amortized Cost	7,605	9,532
Marketable investments, Gross Unrealized Gains
Marketable investments, Gross Unrealized Losses		(9)
Marketable investments, Fair Market Value	7,605	9,523
Marketable investments, Gross Unrealized Losses		9
Total cash, cash equivalents and marketable securities, Amortized Cost	33,921	35,584
Total cash, cash equivalents and marketable securities, Fair Market Value	33,921	35,575
US Treasury and Government [Member]
Marketable investments, Amortized Cost	4,114	1,397
Marketable investments, Gross Unrealized Gains
Marketable investments, Gross Unrealized Losses
Marketable investments, Fair Market Value	4,114	1,397
Marketable investments, Gross Unrealized Losses
US Government Agencies Debt Securities [Member]
Marketable investments, Amortized Cost		2,677
Marketable investments, Gross Unrealized Gains
Marketable investments, Gross Unrealized Losses
Marketable investments, Fair Market Value		2,677
Marketable investments, Gross Unrealized Losses
US States and Political Subdivisions Debt Securities [Member]
Marketable investments, Amortized Cost		200
Marketable investments, Gross Unrealized Gains
Marketable investments, Gross Unrealized Losses
Marketable investments, Fair Market Value		200
Marketable investments, Gross Unrealized Losses
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable investments, Amortized Cost	3,491	2,433
Marketable investments, Gross Unrealized Gains
Marketable investments, Gross Unrealized Losses
Marketable investments, Fair Market Value	3,491	2,433
Marketable investments, Gross Unrealized Losses
Corporate Debt Securities [Member]
Marketable investments, Amortized Cost		2,825
Marketable investments, Gross Unrealized Gains
Marketable investments, Gross Unrealized Losses		(9)
Marketable investments, Fair Market Value		2,816
Marketable investments, Gross Unrealized Losses		$ 9