The Company, Basis of Presentation and Summary of Significant Accounting Policies (Details 2) (USD $)	Dec. 31, 2012
Year ending December 31, 2013	$ 1,550,467
Year ending December 31, 2014	1,316,481
Year ending December 31, 2015	907,591
Year ending December 31, 2016	399,291
Stock Option Amortization Expense Net	$ 4,173,830

The aggregate estimated amortization expense for succeeding fiscal years for stock option subject to amortization.

No definition available.

Name:	chtp_StockOptionAmortizationExpenseNet
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of stock option amortization expense expected to be recognized during year one of the five succeeding fiscal years.

No definition available.

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

The amount of stock option amortization expense expected to be recognized during year four of the five succeeding fiscal years.

No definition available.

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

The amount of stock option amortization expense expected to be recognized during year three of the five succeeding fiscal years.

No definition available.

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

The amount of stock option amortization expense expected to be recognized during year two of the five succeeding fiscal years.

No definition available.

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