Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts	$ 605	$ 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	51,553,306	36,753,891
Common stock, shares outstanding	49,176,177	35,327,893
Treasury stock, shares	590,435	565,199