Redeemable Convertible Preferred Stock (Details)							12 Months Ended
	Nov. 22, 2016 USD ($) $ / shares	Jun. 03, 2016 USD ($) $ / shares	Apr. 08, 2016 USD ($) $ / shares shares	Apr. 07, 2016 USD ($) $ / shares shares	Aug. 03, 2015 shares	Jun. 13, 2013 $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Jun. 20, 2016 shares	Aug. 02, 2015 shares
Class of Stock [Line Items]
Exercise price of warrants | $ / shares	$ 0.75						$ 2.29	$ 8.19
Remaining shares authorized for issuance | shares					670,000,000		670,000,000	670,000,000		445,000,000
Dividends payable							$ 38,000
Combined per share purchase price of common stock and warrants issued | $ / shares		$ 2.35
Proceeds from equity offerings, gross	$ 4,000,000	$ 5,000,000
Shares of common stock issued upon conversion of preferred stock | shares			1,505,560
Preferred B stock conversion liability								$ 1,493,000
Amount reclassified to Series B redeemable convertible stock							(1,493,000)	(8,971,000)
Reverse stock split, description					1-for-50 (1:50) reverse stock split of its common stock, par value $0.01 per share
Conversion ratio of reverse stock split					50
Dilutive Financing Derivative Liability [Member]
Class of Stock [Line Items]
Derivative liability							126,000
Changes in estimated fair value							$ (611,000)
Common Stock Issuance Agreement [Member]
Class of Stock [Line Items]
Shares issued per agreement | shares			853,465
Exercise price of warrants | $ / shares			$ 4.05	$ 7.00
Warrant expiration date			March 31, 2021	June 26, 2018
Cash payments in respect of accrued dividends			$ 2,200,000
Trigger price per share for requirement to issue additional shares of common stock | $ / shares			$ 4.05
Limitation rate for obligation to issue additional shares							19.99%
Remaining shares authorized for issuance | shares							286,846		1,037,053
Minimum proceeds from conversion of stock upon closing of offering							$ 10,000,000
Common Stock Issuance Agreement [Member] | Dilutive Financing Derivative Liability [Member]
Class of Stock [Line Items]
Derivative liability			$ 2,300,000
Changes in estimated fair value		$ 1,500,000					$ 611,000
Series B Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized | shares						9,357,935
Preferred Stock, initial stated value per share | $ / shares						$ 1.40
Preferred Stock, par value per share | $ / shares						$ 0.01
Preferred stock, shares outstanding | shares				7,527,853
Number of common stock shares into which each share of preferred stock can be converted				0.20
Preferred Stock dividend rate						10.00%
Preferred Stock, liquidation preference per share | $ / shares							$ 1.40
Trigger price per share for redemption and conversion features of embedded derivative | $ / shares						$ 7.00
Amount reclassified to Series B redeemable convertible stock				$ 1,858,000