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Secured Convertible Notes and Related Common Stock Purchase Warrants - Summary of Convertible Notes (Details) $ / shares in Units, $ in Thousands	Sep. 30, 2018 USD ($) $ / shares
Debt Instrument [Line Items]
Principal	$ 9,400
Unamortized Discount	(6,600)
Net Amount	2,800
Accrued Interest	$ 100
June 2018 Convertible Note [Member]
Debt Instrument [Line Items]
Interest rate	8.00%
Conversion price | $ / shares	$ 1.75
Principal	$ 3,400
Unamortized Discount	(1,500)
Net Amount	1,900
Accrued Interest	$ 100
July 2018 Convertible Note [Member]
Debt Instrument [Line Items]
Interest rate	8.00%
Conversion price | $ / shares	$ 1.75
Principal	$ 2,200
Unamortized Discount	(1,700)
Net Amount	500
Accrued Interest	$ 10
August 2018 Convertible Note [Member]
Debt Instrument [Line Items]
Interest rate	8.00%
Conversion price | $ / shares	$ 1.75
Principal	$ 3,300
Unamortized Discount	(2,900)
Net Amount	400
Accrued Interest	$ 10
September 2018 Convertible Note [Member]
Debt Instrument [Line Items]
Interest rate	8.00%
Conversion price | $ / shares	$ 1.75
Principal	$ 500
Unamortized Discount	$ (500)

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Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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The price per share of the conversion feature embedded in the debt instrument.

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