Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Preferred stock, par value		$ 0.0001
Preferred stock, shares authorized		11,000
Preferred stock, shares issued		5,043
Preferred stock, shares outstanding		5,043
Preferred stock, redemption value		$ 5,116
Preferred stock, liquidation preference value		$ 5,116
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	12,000,000,000	12,000,000,000
Common stock, shares issued	14,267,383	874,746
Common stock, shares outstanding	14,267,383	874,746
Preferred stock, par value	$ 0.0001
Preferred stock, shares authorized	8,000,000
Series D-1 preferred
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,134	5,134
Preferred stock, shares issued	4,615	0
Preferred stock, shares outstanding	4,615	0
Preferred stock, shares authorized	5,134
Preferred stock, shares issued	4,615
Preferred stock, shares outstanding	4,615
Series C-1 convertible preferred stock
Preferred stock, par value	$ 0.0001
Preferred stock, shares authorized	11,000
Preferred stock, shares issued	5,792
Preferred stock, shares outstanding	5,792
Series C-2 convertible preferred stock
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	22,000	22,000
Preferred stock, shares issued	500
Preferred stock, shares outstanding	500
Series C-1 preferred
Preferred stock, shares authorized	11,000
Preferred stock, shares issued	5,792	5,043
Preferred stock, shares outstanding	5,792	5,043
Series C-2 preferred
Preferred stock, shares authorized	22,000
Preferred stock, shares issued	500
Preferred stock, shares outstanding	500