Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Allowances for doubtful accounts receivable	$ 408	$ 475
Allowances for inventories	$ 1,441	$ 1,329
Preferred stock, no par value	$ 0	$ 0
Preferred stock, shares authorized	5,334,285	5,334,285
Preferred stock, shares outstanding	0	0
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	105,000,000	105,000,000
Common stock, shares issued	61,448,937	60,137,758
Common stock, shares outstanding	61,448,937	60,137,758