Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jan. 02, 2009
Operating Loss Carryforwards [Line Items]
Likelihood of unfavorable settlement	An uncertain tax position will not be recognized if it has a less than 50% likelihood of being sustained.
Unrecognized tax benefits			$ 0
Unrecognized tax benefits that would affect company's effective tax rate, if recognized	0	0
Accrual on interest and penalties related to income taxes	0	0
Tax years subject to examination by taxing authorities	Beginning 2007 to date
Net operating loss carryforwards	8,400,000
Cumulative change in ownership for limitation of use of net operating loss and research and development credit carryforwards	50.00%
Period of cumulative change of ownership	3 years
Research and development credit	931,000
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	21,200,000
Expiry period of carryforwards	2027
Tax credit carryforwards	627,000
Expiry of federal research credit carryforwards	2027
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	20,700,000
Expiry period of carryforwards	2017
Tax credit carryforwards	$ 459,000