April 2013 Pillar Agreements - Additional Information (Details)				1 Months Ended	12 Months Ended
	May 07, 2013 USD ($) $ / shares	Apr. 30, 2013 USD ($) agreement $ / shares shares	Apr. 22, 2013 USD ($) $ / shares shares	Apr. 30, 2013 agreement $ / shares shares	Dec. 31, 2016 shares
Effects of Agreements
Shares of common stock that may be purchased upon exercise of warrants issued | shares					51,709,460
Fair value of the Pillar Warrants in equity	$ 380,000
Extinguishment loss which was immediately charged to net loss applicable to common stockholders	1,750,000
Increase in stockholders equity resulting from preferred stock extinguishment and warrant issuance	$ 5,921,000
Minimum period for determining expected volatility					3 years
Percentage of holding by affiliates above which warrants may not be exercised					19.99%
Pillar I Warrants
Effects of Agreements
Exercise price of warrants | $ / shares	$ 0.61		$ 0.61
Additional cash consideration			$ 0
Consecutive trading days			30 days
Minimum closing price to redeem the warrants | $ / shares			$ 2.80
Redemption price per share of warrants | $ / shares			$ 0.01
Pillar I Warrants | Minimum
Effects of Agreements
Number of trading days			20 days
Pillar I Warrants | Maximum
Effects of Agreements
Shares of common stock that may be purchased upon exercise of warrants issued | shares			1,000,000
Additional Pillar Warrants
Effects of Agreements
Shares of common stock that may be purchased upon exercise of warrants issued | shares		1,000,000		1,000,000
Exercise price of warrants | $ / shares	$ 0.79	$ 0.79		$ 0.79
Additional cash consideration		$ 0
Final exercise date of warrant				Jun. 01, 2014
Series D Convertible Preferred Stock
Effects of Agreements
Carrying value of preferred stock prior to extinguishment	$ 5,921,000
Value of preferred stock immediately after the extinguishment of equity	5,464,000
Series E Convertible Preferred Stock
Effects of Agreements
Carrying value of preferred stock prior to extinguishment	3,701,000
Value of preferred stock immediately after the extinguishment of equity	$ 5,528,000
April 2013 Pillar Agreements
Effects of Agreements
Number of agreements | agreement		2		2
April 2013 Pillar Agreements | Series D Convertible Preferred Stock | Minimum
Effects of Agreements
Unaffiliated ownership percent that would trigger the right to require the Company to repurchase stock that was waived by Pillar Agreement				66.67%
April 2013 Pillar Agreements | Series D And Series E Preferred Stock
Effects of Agreements
Percentage of preferred stock holders who waived right to receive specified amount in liquidation				100.00%