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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

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Face (par) amount of debt instrument at time of issuance.

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

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Convertible Debentures (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Jul. 21, 2014 USD ($) shares $ / shares	Mar. 31, 2016 USD ($) shares $ / shares	Jan. 29, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / shares
Debt Instrument [Line Items]
Total convertible debt		$ 10,308		$ 9,839
Exercise price of warrants (in dollars per share) \| $ / shares			$ 1.06	$ 1.13
Common stock, par value (in dollars per share) \| $ / shares		$ 0.001		$ 0.001
Fair value of warrants			$ 47	$ 321
Debentures outstanding amount		$ 40,828
Maximum [Member]
Debt Instrument [Line Items]
Discounted cash flow change		10.00%
Series A Warrants [Member]
Debt Instrument [Line Items]
Number of warrants to purchase common stock (in shares) \| shares	6,198,832
Exercise price of warrants (in dollars per share) \| $ / shares	$ 2.45
Warrants expiration date		Jul. 01, 2019
Common stock, par value (in dollars per share) \| $ / shares	$ 0.001
Senior Secured 2.25% Convertible Debentures [Member]
Debt Instrument [Line Items]
Total convertible debt		$ 5,841		5,489
Debt instrument, unamortized discount		25,718		26,267
Deferred financing costs		$ 554		522
Senior secured convertible debentures interest rate		2.25%
Aggregate principal amount of debt		$ 32,500
Number of shares debt convertible (in shares) \| shares		43,333,334
Senior secured convertible debentures 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. 30, 2021
Senior Secured 2.25% Convertible Debentures [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Senior secured convertible debentures conversion price (in dollars per share) \| $ / shares		$ 1.38
Senior Secured 2.25% Convertible Debentures [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Senior secured convertible debentures conversion price (in dollars per share) \| $ / shares		$ 0.75
Senior Secured 4% Convertible Debentures [Member]
Debt Instrument [Line Items]
Total convertible debt		$ 4,467		4,350
Debt instrument, unamortized discount	$ 10,353	3,816		3,922
Deferred financing costs		$ 432		$ 443
Senior secured convertible debentures interest rate		4.00%
Aggregate principal amount of debt	$ 15,000
Number of shares debt convertible (in shares) \| shares	5,847,955
Senior secured convertible debentures conversion price (in dollars per share) \| $ / shares	$ 2.565
Debt instrument, maturity period		5 years
Debt instrument, convertible, beneficial conversion feature	$ 4,565
Maturity date		Jun. 30, 2021
Fair value of warrants	5,296
Fair value of warrants adjustment (income) expense	491
Debt instrument initial carrying amount	$ 4,647
June 2015 Note [Member]
Debt Instrument [Line Items]
Debentures converted in shares of common stock, value		$ 165
Debt conversion, converted instrument, issued (in shares) \| shares		220,000
Interest expense on debt		$ 136