Convertible Debentures (Details) $ / shares in Units, $ in Thousands		9 Months Ended
	Jul. 21, 2014 USD ($) shares $ / shares	Sep. 30, 2015 USD ($) shares $ / shares	Jun. 22, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($) $ / shares	Jul. 24, 2014 $ / shares	Oct. 29, 2013 $ / shares shares
Debt Instrument [Line Items]
Total convertible debt		$ 11,373		$ 5,001
Exercise price of warrants (in dollars per share) | $ / shares		$ 0.75	$ 0.75
Common stock, par value (in dollars per share) | $ / shares		$ 0.001		$ 0.001
Fair value of warrants		$ 2,561	$ 2,959
Debentures converted in shares of common stock, value		$ 4,593
Debt conversion, converted instrument, issued (in shares) | shares		1,790,671
Interest expense on debt		$ 3,415
Debentures outstanding amount		$ 41,317
Series A Warrants [Member]
Debt Instrument [Line Items]
Number of warrants to purchase common stock (in shares) | shares	6,198,832	6,198,832				685,715
Exercise price of warrants (in dollars per share) | $ / shares	$ 2.45	$ 0.75			$ 2.45	$ 8.50
Warrants expiration date		Jul. 01, 2019
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001
Senior Secured 2.25% Convertible Debentures [Member]
Debt Instrument [Line Items]
Total convertible debt		$ 6,701		$ 0
Debt instrument, unamortized discount		$ 25,798
Interest rate		2.25%
Aggregate principal amount of debt		$ 32,500
Number of shares debt convertible (in shares) | shares		43,333,334
Initial conversion price (in dollars per share) | $ / shares		$ 0.75
Debt instrument, maturity period		5 years
Debt instrument, convertible, beneficial conversion feature		$ 27,300
Maturity date		Jun. 22, 2020
Senior Secured 2.25% Convertible Debentures [Member] | Maximum [Member]
Debt Instrument [Line Items]
Initial conversion price (in dollars per share) | $ / shares		$ 1.38
Senior Secured 2.25% Convertible Debentures [Member] | Minimum [Member]
Debt Instrument [Line Items]
Initial conversion price (in dollars per share) | $ / shares		$ 0.75
Senior Secured 4% Convertible Debentures [Member]
Debt Instrument [Line Items]
Total convertible debt		$ 4,672		5,001
Debt instrument, unamortized discount	$ 10,353	$ 4,146		$ 8,410
Interest rate		4.00%
Aggregate principal amount of debt	$ 15,000	$ 15,000
Number of shares debt convertible (in shares) | shares	5,847,955	5,847,955
Initial conversion price (in dollars per share) | $ / shares	$ 2.565	$ 2.565
Debt instrument, maturity period		5 years
Debt instrument, convertible, beneficial conversion feature	$ 4,565	$ 4,565
Maturity date		Jul. 01, 2019
Fair value of warrants	5,296
Fair value of warrants adjustment (income) expense	491
Debt instrument initial carrying amount	$ 4,647