Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 28, 2016	Dec. 28, 2015
Current assets:
Accounts receivable, allowances	$ 41	$ 223
Notes receivable, allowances	$ 1,001	$ 1,001
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	47,803,961	47,972,150
Treasury stock, shares (in shares)	59,886	59,886