Restructuring (Details Textual) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Payroll Reduction Percentage	25.00%
Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Issued In Period	827,000
Restructuring Charges To Reserve Total		$ 2.5
Cash Payments Related To Restructuring Reserves	2.1
Restructuring Reserve Accrual Adjustment Total	$ 100,000
Executive Officer [Member]
Restructuring Cost and Reserve [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Issued In Period	350,000
Board Of Directors Chairman [Member]
Restructuring Cost and Reserve [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Issued In Period	157,500
Employees Other [Member]
Restructuring Cost and Reserve [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Issued In Period	319,500
Director [Member]
Restructuring Cost and Reserve [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period	100,210	100,210
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	335,000

The element represents the payments of restructuring reserves.

No definition available.

Name:	chtp_CashPaymentsRelatedToRestructuringReserves
Namespace Prefix:	chtp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of pay reduction to employees and director's fees as a result of the cost savings initiatives.

+ References

No definition available.

+ Details

Name:	chtp_PayrollReductionPercentage
Namespace Prefix:	chtp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of charges to the reserves against earnings in the period for incurred and estimated total costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

+ References

No definition available.

+ Details

Name:	chtp_RestructuringChargesToReserveTotal
Namespace Prefix:	chtp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

+ References

No definition available.

+ Details

Name:	chtp_RestructuringReserveAccrualAdjustmentTotal
Namespace Prefix:	chtp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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

- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(4)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Period Type:	duration

- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

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Period Type:	duration