Convertible Notes - Calm Note (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Jul. 08, 2019
Debt Instrument [Line Items]
Fair value assigned to conversion option	$ 3,457
Amortization expense	87	$ 394
Accretion expense	602
Calm Note, net
Debt Instrument [Line Items]
Fair value assigned to conversion option			$ 550
Revaluation gain on conversion option marked to market	75
Debt issuance costs, net	165		$ 220
Amortization expense	19
Accretion expense	$ 117

Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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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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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Represents the fair value assigned to the conversion option.

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The revaluation gain on conversion option marked to market.

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