Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Series E convertible voting preferred stock [Member]	Dec. 31, 2011 Series E convertible voting preferred stock [Member]
Allowance for doubtful accounts receivable	$ 228	$ 471
Preferred stock, par value	$ 0.001	$ 0.001	$ 10,000	$ 10,000
Preferred stock, shares authorized	5,000,000	5,000,000	2,000	2,000
Preferred stock, shares issued			20	26
Preferred stock, shares outstanding			20	26
Preferred stock, liquidation value			$ 240	$ 240
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	60,026,675	59,247,483
Common stock, shares outstanding	60,026,675	59,247,483
Treasury stock, shares outstanding	0	363,055