Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 29, 2015	Dec. 29, 2014
Current assets:
Accounts receivable, allowances	$ 201	$ 118
Notes receivable, allowances	$ 675	$ 450
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)	48,104,677	38,410,196
Common stock, shares outstanding (in shares)	48,104,677	38,410,196
Treasury stock, shares (in shares)	59,886	59,886