CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
CONDENSED CONSOLIDATED BALANCE SHEETS
Allowances for accounts receivable (in dollars)	$ 5,286	$ 4,253
Allowance for unbilled services (in dollars)	$ 2,362	$ 1,720
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value ( in dollars per share )	$ 0	$ 0
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	8,516,783	8,333,990
Common stock, shares outstanding	8,516,783	8,333,990