Preferred Stock, Common Stock and Stockholders' Equity - Stock-Based Compensation and Employee Stock Purchase Plan - Additional Information (Detail) - USD ($) $ in Millions			12 Months Ended
	Jan. 02, 2016	Jun. 13, 2013	Dec. 31, 2015	Dec. 31, 2014	Jan. 01, 2016
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs			$ 2.3
Weighted average period			1 year 1 month 17 days
Common stock reserved for issuance			1,276,765	1,043,457
Issuance of common stock from employee stock purchase plan, Shares			41,176	7,294
Employee stock purchase plan [Member]
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price of common stock as percentage of fair market value		85.00%
Percentage of deduction of eligible compensation		20.00%
Common stock reserved for issuance		30,000	41,530
Shares of common stock available for issuance description			In addition, the number of shares of common stock available for issuance under the ESPP is annually increased on the first day of each fiscal year during the term of the ESPP by an amount equal to the lesser of: (i) 30,000 shares; (ii) one percent of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year; or (iii) such other amount as the Company’s board of directors may determine.
Reserve percentage for issuance of shares		100.00%
ESPP approval date		Aug. 29, 2013
Subsequent Event [Member] | Employee stock purchase plan [Member]
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance					71,530
Stock issued during period, shares, period increase	30,000