Senior Notes Payable (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended	12 Months Ended
Jun. 22, 2015	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Senior-secured notes payable, net of unamortized debt discount of $1,152		$ 8,848	$ 0
Assumptions used to value the warrants [Abstract]
Number of shares underlying warrants (in shares)	3,000,000	3,000,000
Exercise price (in dollars per share)	$ 0.75	$ 0.75
Share price (in dollars per share)	$ 1.38	$ 1.14
Fair value of warrants	$ 2,959	$ 2,561
Probability of stockholder approval	80.00%	100.00%
Volatility	90.00%	90.00%
Risk-free interest rate	1.62%	1.30%
Expected dividend yield	0.00%	0.00%
Expected warrant life	5 years	4 years 8 months 23 days
Warrant [Member]
Debt Instrument [Line Items]
Unamortized debt discount		$ 1,152
Assumptions used to value the warrants [Abstract]
Exercise price (in dollars per share)		$ 0.75
Share price (in dollars per share)	$ 1.38	$ 1.14	$ 1.20
Fair value of warrants		$ 2,958
Volatility	90.00%	90.00%
Risk-free interest rate	1.62%		1.65%
Expected dividend yield	0.00%	0.00%	0.00%
Expected warrant life	5 years
Financing 2015 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt	$ 42,500	$ 42,500
Senior Secured Notes Payable [Member]
Debt Instrument [Line Items]
Senior-secured notes payable, net of unamortized debt discount of $1,152		8,848
Unamortized debt discount		$ 1,152
Number of days for stockholders approval considered for maturity date		30 days
Interest rate		12.00%
Warrants liability repayment terms		5 months
Senior Secured Notes Payable [Member] \| Financing 2015 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt	$ 10,000
Number of days for stockholders approval considered for maturity date	30 days
Interest rate	9.00%
Debentures [Member] \| Financing 2015 [Member]
Debt Instrument [Line Items]
Senior secured convertible debentures	$ 500	$ 500

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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