Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
Accounts receivable, allowances	$ 36	$ 17
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	35,068,000	34,137,000
Common stock, shares outstanding (in shares)	35,068,000	34,137,000
Treasury stock (in shares)	445,000
Series A Convertible Preferred Stock
Series A convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Share liquidation value (in dollars per share)	$ 1.45	$ 1.45
Share aggregate value	$ 6,017	$ 6,017
Series A convertible preferred stock, shares authorized (in shares)	4,150,000	4,150,000
Series A convertible preferred stock, shares issued (in shares)	4,150,000	4,150,000
Series A convertible preferred stock, shares outstanding (in shares)	4,150,000	4,150,000