Stockholders' Equity - Summary of Outstanding Warrants (Detail)	6 Months Ended
	Jun. 29, 2013
Warrants Related to February 2012 Financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding	419,451
Common Shares, Currently Exercisable	419,451
Common Shares, Price per Share	16.20
Common Shares, Expiration Date	Feb. 22, 2017
Warrants Related to November 2012 Financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding	8,333
Common Shares, Price per Share	4.50
Common Shares, Expiration Date	Nov. 26, 2015
Warrants Related to December 2012 Financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding	15,625
Common Shares, Price per Share	4.50
Common Shares, Expiration Date	Dec. 18, 2015
Warrants Related to April 2013 Financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding	256,914
Common Shares, Price per Share	5.45
Common Shares, Expiration Date	Apr. 26, 2015
Warrants Related to April 2013 Financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding	256,913
Common Shares, Price per Share	5.45
Common Shares, Expiration Date	Apr. 26, 2019