Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 672	$ 262
Cumulative convertible preferred stock at accreted value, par value	$ 0.0001	$ 0.0001
Cumulative convertible preferred stock, shares authorized	100,000	100,000
Cumulative convertible preferred stock, shares issued	0	11,205
Cumulative convertible preferred stock, shares outstanding	0	11,205
Cumulative convertible preferred stock, liquidation preference	$ 1,000	$ 1,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	51,575,359	36,753,891
Common stock, shares outstanding	49,444,592	35,327,893
Treasury stock, shares	592,156	565,199