Period between issuance and maturity of investment other than investment in equity security, investment in debt security and equity method investment, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

+ Details

Name:	cry_AlternativeInvestmentTerm
Namespace Prefix:	cry_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the current portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions.

+ References

No definition available.

+ Details

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

- Details

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- Details

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Cash Equivalents And Restricted Securities (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	$ 753,000		$ 753,000		$ 776,000
Gross realized gains or losses on cash equivalents	0	$ 0	0	$ 0
Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	753,000		753,000		776,000
Maturity Date Within Three Months [Member] \| Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	231,000		231,000		537,000
Maturity Date Between Three Months And One Year [Member] \| Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	$ 522,000		$ 522,000		$ 239,000
Minimum [Member] \| Maturity Date Between Three Months And One Year [Member] \| Money Market Funds [Member] \| Measurement Input, Expected Term [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities maturity period			3 months		3 months
Maximum [Member] \| Maturity Date Within Three Months [Member] \| Money Market Funds [Member] \| Measurement Input, Expected Term [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities maturity period			3 months		3 months
Maximum [Member] \| Maturity Date Between Three Months And One Year [Member] \| Money Market Funds [Member] \| Measurement Input, Expected Term [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities maturity period			1 year		1 year