Cash Equivalents and Marketable Securities - Contractual Maturities of Investments (Detail) (USD $)	Dec. 29, 2012
Schedule of Available-for-sale Securities [Line Items]
Total, Cost	$ 4,992,709
Total, Fair Value	5,034,102
Fair Value [Member] | Marketable Securities Current [Member]
Schedule of Available-for-sale Securities [Line Items]
Contractual maturities, With in 1 year, Fair Value	3,275,313
Fair Value [Member] | Marketable Securities Noncurrent [Member]
Schedule of Available-for-sale Securities [Line Items]
Contractual maturities, After 1 year through 5 years, Fair Value	1,758,789
Cost of sales [Member]
Schedule of Available-for-sale Securities [Line Items]
Contractual maturities, With in 1 year, Cost	3,274,235
Contractual maturities, After 1 year through 5 years, Cost	$ 1,718,474