Preferred Stock, Common Stock and Stockholders' Equity - Employee Stock Purchase Plan and Stock-Based Compensation - Additional Information (Detail) - USD ($)			12 Months Ended		43 Months Ended
	Jan. 02, 2017	Jun. 13, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Jan. 01, 2017
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs			$ 1,800,000		$ 1,800,000
Weighted average period			11 months 12 days
Common stock reserved for issuance			5,265,764	1,276,765	5,265,764
Shares of common stock available for future issuance under ESPP			37,463	41,530	37,463
Stock issued during period, shares, period increase					30,000
Issuance of common stock under employee stock purchase plan			34,067	41,176
Payroll withholdings from employees			$ 99,000	$ 170,000	$ 99,000
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
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		1.00%
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						67,463
Stock issued during period, shares, period increase	30,000