Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Allowance for doubtful accounts and customer credits	$ 3,891	$ 4,236
Stockholders' equity:
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	141,123,904	137,797,855
Common stock, shares outstanding	141,123,904	137,797,855