Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Allowances for doubtful accounts	$ 9	$ 134	[1]
Common stock, par value	$ 0.001	$ 0.001	[1]
Common stock, shares authorized	100,000,000	100,000,000	[1]
Common stock, shares issued	33,619,766	32,278,330	[1]
Common stock, shares outstanding	28,637,022	27,295,586	[1]
Treasury stock,shares	4,982,744	4,982,744	[1]

[1] See Note 1 "Significant Accounting Policies - Intangible Assets" of Notes to Consolidated Financial Statements.