(7) Derivative Financial Instruments (Detail) - (Table 1) (Warrant Derivative, USD $)	3 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Warrant Derivative
Beginning Balance	$ 4,664,894	$ 3,005,319
Fair value adjustments	(313,830)	611,702
Ending Balance	$ 4,351,064	$ 3,617,021

The increase (decrease) during the period, which was recognized in earnings, in the unrealized gains or losses on derivative instruments that are not or are no longer designated as hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 20

-Section 35

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6439004&loc=d3e65527-113976

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 18

-Subparagraph a, b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration