Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Stockholders' equity
Series I redeemable preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Series I redeemable preferred stock, shares issued	35,541	119,760
Series I redeemable preferred stock, shares outstanding	35,541	119,760
Series I redeemable preferred stock, liquidation preference	$ 167	$ 167
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	50,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000us-gaap_CommonStockSharesAuthorized	200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	28,609,695us-gaap_CommonStockSharesIssued	3,770,113us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	28,609,467us-gaap_CommonStockSharesOutstanding	3,769,712us-gaap_CommonStockSharesOutstanding
Treasury stock, shares	228us-gaap_TreasuryStockShares	401us-gaap_TreasuryStockShares
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.0001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
liquidation preference	$ 0.0001	$ 0.0001
Series C Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.0001
Preferred stock, shares issued	1	1
Preferred stock, shares outstanding	1	1
liquidation preference	$ 0.0001	$ 0.0001
Series D Preferred Stock [Member]
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.0001
Preferred stock, shares issued	4,725	1,227,582
Preferred stock, shares outstanding	4,725	1,227,582
liquidation preference	$ 0.0001	$ 0.0001
Series D-1 Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.0001
Preferred stock, shares issued	834	59,265
Preferred stock, shares outstanding	834	59,265
liquidation preference	$ 0.0001	$ 0.0001
Series F-1 Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.0001
Preferred stock, shares issued	0	156,250
Preferred stock, shares outstanding	0	156,250
liquidation preference	$ 0.0001	$ 0.0001
Series H Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.0001
Preferred stock, shares issued	439,043	459,043
Preferred stock, shares outstanding	439,043	459,043
liquidation preference	$ 0.0001	$ 0.0001
Series J Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.0001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
liquidation preference	$ 0.0001	$ 0.0001

Series I redeemable preferred stock, liquidation preference.

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