Fair Value Measurements - Summary of Fair Value Assumptions for Derivative Liabilities (Detail) (USD $)	3 Months Ended
Aug. 02, 2014	Aug. 03, 2013
Fair Value Disclosures [Abstract]
Share Price	$ 1.93	$ 4.47
Conversion price	$ 1.75	$ 1.75
Expected volatility	76.00%	70.00%
Expected term (in years)	7 years 4 months 24 days	8 years 4 months 24 days
Risk free interest rate	2.16%	2.32%
Expected dividends

Agreed upon price for the exchange of the underlying asset.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Amount of dividends expected to be paid to holders of the underlying shares or contracted instruments over the term of the instruments life.

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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