Stock-Based Compensation - Schedule of Unrecognized Compensation Cost (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2016 (period from July 1, to December 31, 2016)	$ 1,717
2017	3,438
2018	2,082
2019	598
2020	58
Total	$ 7,893

buff_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationNotyetRecognizedYearSix

No definition available.

Name:	buff_Buff_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationNotyetRecognizedYearSix
Namespace Prefix:	buff_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options, Year Five

+ References

No definition available.

+ Details

Name:	buff_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationNotyetRecognizedStockOptionsYearFive
Namespace Prefix:	buff_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options, Year Four

+ References

No definition available.

+ Details

Name:	buff_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationNotyetRecognizedStockOptionsYearFour
Namespace Prefix:	buff_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options, Year Three

+ References

No definition available.

+ Details

Name:	buff_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationNotyetRecognizedStockOptionsYearThree
Namespace Prefix:	buff_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options, Year Two

+ References

No definition available.

+ Details

Name:	buff_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationNotyetRecognizedStockOptionsYearTwo
Namespace Prefix:	buff_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

+ Details

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

- 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

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