Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts receivable, allowances	$ 338	$ 401	[1]
Preferred stock, par value	$ 0.001	$ 0.001	[1]
Preferred stock, shares authorized	10,000	10,000	[1]
Preferred stock, issued			[1]
Preferred stock, outstanding			[1]
Common stock, par value	$ 0.001	$ 0.001	[1]
Common stock, shares authorized	130,000	130,000	[1]
Common stock, shares issued	64,239	60,809	[1]
Common stock, shares outstanding	64,239	60,809	[1]
Treasury stock, shares	618	618	[1]

[1] The condensed consolidated balance sheet has been derived from the audited consolidated financial statements at December 31, 2012 but does not include all the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.