Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Accounts receivable, net of allowances	$ 1,229	$ 1,476
Property and equipment, net of accumulated depreciation	$ 22,576	$ 20,108
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	35,427	34,371
Common stock, shares outstanding	35,427	34,371