v2.4.0.6

Note 12 - Stockholders' Equity (Detail) - Warrants issued to purchase Common Stock that are outstanding: | Dec. 31, 2012
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Number of Warrants (in Shares) | 1,157,377
Rho [Member] |
Number of Warrants (in Shares) | 476,190
Exercise Price Range (Per Share) | 1.05
Expiration Dates | August 2019
Prentice [Member] |
Number of Warrants (in Shares) | 476,190
Exercise Price Range (Per Share) | 1.05
Expiration Dates | August 2019
Consultant [Member] |
Number of Warrants (in Shares) | 150,000
Exercise Price Range (Per Share) | 2.28
Expiration Dates | October 2021
Soros [Member] | Minimum [Member] |
Exercise Price Range (Per Share) | 5.10
Soros [Member] | Maximum [Member] |
Exercise Price Range (Per Share) | 7.80
Soros [Member] |
Number of Warrants (in Shares) | 34,086
Expiration Dates | March 2013
Maverick [Member] |
Number of Warrants (in Shares) | 19,796
Exercise Price Range (Per Share) | 5.10
Expiration Dates | March 2013
Various Holders [Member] | Minimum [Member] |
Exercise Price Range (Per Share) | 5.10
Various Holders [Member] | Maximum [Member] |
Exercise Price Range (Per Share) | 7.80
Various Holders [Member] |
Number of Warrants (in Shares) | 1,115
Expiration Dates | March 2013

X
- Definition Expiration date of the warrants or rights. + References No definition available. + Details
Name: | bfly_ClassOfWarrantOrRightExpirationDate
Namespace Prefix: | bfly_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | instant

X
- Definition The exercise price of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant