The Company, Basis of Presentation and Summary of Significant Accounting Policies (Details 2) (USD $)	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Year ending December 31, 2014	$ 1,731,814
Year ending December 31, 2015	876,035
Year ending December 31, 2016	290,407
Year ending December 31, 2017	54,208
Stock Option Amortization Expense Net	$ 2,952,464

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

No definition available.

Name:	chtp_StockOptionAmortizationExpenseNet
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 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

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