Consolidated Balance Sheets (unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Convertible notes, accrued interest payable (in Dollars)	$ 0	$ 112
Common stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	205,926,290	100,370,203
Common stock, shares issued	240,614	239,905
Common stock, shares outstanding	240,614	239,905
Series A Preferred Stock [Member]
Redeemable convertible preferred stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Redeemable convertible preferred stock, shares authorized	22,638,465	22,638,465
Redeemable convertible preferred stock, shares issued	22,638,465	22,638,465
Redeemable convertible preferred stock shares outstanding	22,638,465	22,638,465
Redeemable convertible preferred stock, aggregate liquidation preference (in Dollars)	12,288	22,638
Series A-1 Preferred Stock [Member]
Redeemable convertible preferred stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Redeemable convertible preferred stock, shares authorized	10,909,091	10,909,091
Redeemable convertible preferred stock, shares issued	10,909,091	10,909,091
Redeemable convertible preferred stock shares outstanding	10,909,091	10,909,091
Redeemable convertible preferred stock, aggregate liquidation preference (in Dollars)	6,514	12,000
Series B Preferred Stock [Member]
Redeemable convertible preferred stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Redeemable convertible preferred stock, shares authorized	20,754,461	20,754,461
Redeemable convertible preferred stock, shares issued	20,754,461	20,754,461
Redeemable convertible preferred stock shares outstanding	20,754,461	20,754,461
Redeemable convertible preferred stock, aggregate liquidation preference (in Dollars)	12,955	23,867
Series C Preferred Stock [Member]
Redeemable convertible preferred stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Redeemable convertible preferred stock, shares authorized	17,550,758	17,550,758
Redeemable convertible preferred stock, shares issued	13,202,932	13,202,932
Redeemable convertible preferred stock shares outstanding	13,202,932	13,202,932
Redeemable convertible preferred stock, aggregate liquidation preference (in Dollars)	8,241	15,183
Series D Preferred Stock [Member]
Redeemable convertible preferred stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Redeemable convertible preferred stock, shares authorized	86,789,527	0
Redeemable convertible preferred stock, shares issued	52,813,827	0
Redeemable convertible preferred stock shares outstanding	52,813,827	0
Redeemable convertible preferred stock, aggregate liquidation preference (in Dollars)	$ 31,089	$ 0