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Outstanding Debt - Summary of Notes by Maturity Dates (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Principal	$ 6.1	$ 4.5
Unamortized Discount	(0.3)	(2.5)
Carrying value	$ 5.8	$ 2.0
March 21, 2019 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 21, 2019
Interest rate		8.00%
Conversion price		$ 1.75
Principal		$ 0.4
Unamortized Discount		(0.2)
Carrying value		$ 0.2
March 21, 2020 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 21, 2020
Interest rate		8.00%
Conversion price		$ 1.75
Principal		$ 0.1
Unamortized Discount		$ (0.1)
December 4, 2018 [Member]
Debt Instrument [Line Items]
Maturity date	Dec. 04, 2018
Interest rate		8.00%
Conversion price		$ 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		$ 1.75
Principal		$ 0.6
Unamortized Discount		(0.5)
Carrying value		$ 0.1
December 4, 2019 [Member]
Debt Instrument [Line Items]
Maturity date	Dec. 04, 2019
Interest rate		8.00%
Conversion price		$ 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		$ 1.75
Principal		$ 0.8
Unamortized Discount		$ (0.8)
Short Term Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Principal	$ 0.5
Unamortized Discount	(0.1)
Carrying value	$ 0.4
Short Term Convertible Notes Payable [Member] | March 21, 2019 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 21, 2019
Interest rate	8.00%
Conversion price	$ 1.75
Principal	$ 0.4
Unamortized Discount	(0.1)
Carrying value	$ 0.3
Short Term Convertible Notes Payable [Member] | March 21, 2020 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 21, 2020
Interest rate	8.00%
Conversion price	$ 1.75
Principal	$ 0.1
Carrying value	0.1
Short Term Notes Payable [Member]
Debt Instrument [Line Items]
Principal	5.6
Unamortized Discount	(0.2)
Carrying value	$ 5.4
Short Term Notes Payable [Member] | December 4, 2018 [Member]
Debt Instrument [Line Items]
Maturity date	Dec. 04, 2018
Interest rate	8.00%
Principal	$ 1.7
Carrying value	$ 1.7
Short Term Notes Payable [Member] | March 1, 2019 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 01, 2019
Interest rate	8.00%
Principal	$ 0.6
Carrying value	$ 0.6
Short Term Notes Payable [Member] | December 4, 2019 [Member]
Debt Instrument [Line Items]
Maturity date	Dec. 04, 2019
Interest rate	8.00%
Principal	$ 0.9
Unamortized Discount	(0.2)
Carrying value	$ 0.7
Short Term Notes Payable [Member] | March 1, 2020 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 01, 2020
Interest rate	8.00%
Principal	$ 0.8
Carrying value	$ 0.8
Short Term Notes Payable [Member] | April 1, 2020 [Member]
Debt Instrument [Line Items]
Maturity date	Apr. 01, 2020
Interest rate	8.00%
Principal	$ 1.6
Carrying value	$ 1.6

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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