Condensed Consolidated Balance Sheets (Parenthetical) (As Restated [Member], USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Allowance for doubtful accounts receivable	$ 239	$ 228
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	60,284,571	60,026,675
Common stock, shares outstanding	60,284,571	60,026,675
Series B junior participating preferred stock [Member]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,500,000	1,500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series E convertible voting preferred stock [Member]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, stated value	$ 10,000	$ 10,000
Preferred stock, shares authorized	2,000	2,000
Preferred stock, shares issued	20	20
Preferred stock, shares outstanding	20	20
Preferred stock, liquidation value	$ 240	$ 240