v2.4.0.6

Note 10 - Revolving Credit Facility Financing Agreement (Detail) (USD $) | 0 Months Ended |  | 0 Months Ended |  |  | 12 Months Ended |  | 1 Months Ended
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Nov. 13, 2012 | Dec. 31, 2012 | Nov. 13, 2012 Paid Monthly [Member] | Nov. 13, 2012 Paid Upon Closing of Previous Credit Facility [Member] Wells Fargo [Member] | Nov. 13, 2012 Salus Capital Partners, LLC ("Salus") [Member] | Dec. 31, 2012 Minimum [Member] Credit Facility [Member] | Dec. 31, 2012 Interest Expense and Fees - Combined Credit Facilities [Member] | Dec. 31, 2011 Interest Expense and Fees - Combined Credit Facilities [Member] | Dec. 31, 2010 Interest Expense and Fees - Combined Credit Facilities [Member] | Dec. 31, 2012 Credit Facility - Prime Rate As Basis [Member] | Dec. 31, 2012 Letter of Credit [Member] | Dec. 31, 2012 Committed For Letters of Credit In Favor of Suppliers [Member] | Dec. 31, 2012 Amount Availabe For Further Borrowings, Excluding Letters of Credit Committed In Favor of Suppliers [Member] | Apr. 30, 2013 Amendment To Credit Facility [Member]
Line of Credit Facility, Term |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 10,000,000 |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  | 4.75% |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding | 4,700,000 | 5,311,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility, Origination Fee, Amount | 432,000 |  |  |  |  |  |  |  |  |  |  |  |  | 100,000
Line of Credit Facility, Collateral Fees, Amount |  |  | 3,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Termination Fee |  |  |  | 75,000 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 6,899,000 |  |  |  |  |  |  |  |  |  | 5,311,000 | 1,588,000 |
Interest Expense, Debt |  |  |  |  |  |  | 492,000 | 291,000 | 219,000 |  |  |  |  |
Line Of Credit Facility Increase In Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 650,000

X
- Definition Amount of origination fee paid upon closing of the credit facility + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase to the maximum borrowing capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | bfly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Term of the credit facility. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Termination fee paid at closing. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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X
- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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X
- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the fees associated with providing collateral for the credit facility. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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