Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended		1 Months Ended			1 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 28, 2012	Dec. 30, 2011	Mar. 31, 2012	Mar. 31, 2011	Jun. 30, 2010 2007 Equity Offering	Sep. 14, 2007 2007 Equity Offering	Jun. 30, 2010 2007 Equity Offering Michigan Economic Development Corporation Loan Agreement Two	Sep. 14, 2007 2007 Equity Offering Related Party Transactions	Nov. 29, 2010 2010 Warrants	Nov. 29, 2010 2010 Warrants Minimum
Stockholders Equity Note [Line Items]
Number of class A common stock in each unit								4
Class A common stock par value	$ 0.001		$ 0.001		$ 0.001			$ 0.001
Number of warrant in each unit								1
Warrant exercisable period								5 years			5 years
Exercise price of warrant							1.79	1.85			1.404	1.17
Conversion price per share									$ 0.54
Number of units sold								741,332		33,000
Number of shares sold								2,965,332		132,000
Number of warrants sold								741,332		33,000
Closing stock price										$ 1.83
Aggregate purchase price										$ 4,500,000
Increase in warrants due to change in Exercise price							24,095
Issuance of warrants to Robin Risser and Steve Williamson											267,196
Change in the fair value of warrants	13,000	84,000	26,000	719,000	706,000
Fair value of warrants					$ 26,000	$ 732,000