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Convertible Notes Payable - Summary of Notes by Maturity Dates (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares
Debt Instrument [Line Items]
Principal	$ 4.5
Unamortized Discount	(2.5)
Carrying value	$ 2.0
December 4, 2018 [Member]
Debt Instrument [Line Items]
Maturity date	Dec. 04, 2018
Interest rate	8.00%
Conversion price | $ / shares	$ 1.75
Principal	$ 1.7
Carrying value	$ 1.7
March 1, 2019 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 01, 2019
Interest rate	8.00%
Conversion price | $ / shares	$ 1.75
Principal	$ 0.6
Unamortized Discount	(0.5)
Carrying value	$ 0.1
March 21, 2019 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 21, 2019
Interest rate	8.00%
Conversion price | $ / shares	$ 1.75
Principal	$ 0.4
Unamortized Discount	(0.2)
Carrying value	$ 0.2
December 4, 2019 [Member]
Debt Instrument [Line Items]
Maturity date	Dec. 04, 2019
Interest rate	8.00%
Conversion price | $ / shares	$ 1.75
Principal	$ 0.9
Unamortized Discount	$ (0.9)
March 1, 2020 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 01, 2020
Interest rate	8.00%
Conversion price | $ / shares	$ 1.75
Principal	$ 0.8
Unamortized Discount	$ (0.8)
March 21, 2020 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 21, 2020
Interest rate	8.00%
Conversion price | $ / shares	$ 1.75
Principal	$ 0.1
Unamortized Discount	$ (0.1)

X

- Definition

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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X

- Definition

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

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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