Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts receivable, allowances (in dollars)	$ 177	$ 107
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000	34,900
Common stock, shares issued	33,584	7,092
Common stock, shares outstanding	33,584	5,835
Treasury stock, shares		1,257
Series A convertible preferred stock
Convertible preferred stock, par value (in dollars per share)		$ 0.0001
Convertible preferred stock, shares authorized		5,053
Convertible preferred stock, shares issued		5,053
Convertible preferred stock, shares outstanding		5,053
Series A-2 convertible preferred stock
Convertible preferred stock, par value (in dollars per share)		$ 0.0001
Convertible preferred stock, shares authorized		1,105
Convertible preferred stock, shares issued		1,105
Convertible preferred stock, shares outstanding		1,105
Series B convertible preferred stock
Convertible preferred stock, par value (in dollars per share)		$ 0.0001
Convertible preferred stock, shares authorized		3,500
Convertible preferred stock, shares issued		3,433
Convertible preferred stock, shares outstanding		3,433
Series C convertible preferred stock
Convertible preferred stock, par value (in dollars per share)		$ 0.0001
Convertible preferred stock, shares authorized		10,992
Convertible preferred stock, shares issued		10,983
Convertible preferred stock, shares outstanding		10,983