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Fair Value of Financial Instruments (Details)	3 Months Ended
	Mar. 31, 2016 USD ($)
Fair Value Disclosures [Abstract]
Non-Recurring Fair Value Measurements	$ 0

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- Definition

Non-Recurring Fair Value Measurements

+ References

No definition available.

+ Details

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Namespace Prefix:	cmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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