Stockholders' Equity - Summary of Stock Option Transactions Under Stock Option Plans (Detail) (USD $)	6 Months Ended
	Jun. 29, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Beginning balance	105,383
Number of Shares, Granted	33,333
Number of Shares, Exercised
Number of Shares, Canceled	(1,798)
Number of Shares, Ending balance	136,918
Price Per Share minimum, Beginning balance	$ 8.16
Price Per Share maximum, Beginning balance	$ 894
Price Per Share, Granted	$ 2.52
Price Per Share, Exercised
Price Per Share minimum, Canceled	$ 19.44
Price Per Share maximum, Canceled	$ 796.80
Price Per Share minimum, Ending balance	$ 2.52
Price Per Share maximum, Ending balance	$ 894.00
Weighted Average Exercise Price, Beginning balance	$ 46.08
Weighted Average Exercise Price, Granted	$ 2.52
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Canceled	$ 147.68
Weighted Average Exercise Price, Ending balance	$ 34.11
Number of Options Exercisable, Beginning balance	74,706
Number of Options Exercisable, Ending balance	94,673
Weighted Average Exercise Price exercisable, Beginning balance	$ 56.52
Weighted Average Exercise Price exercisable, Ending balance	$ 46.44