Debt - Net Carrying Amount (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Feb. 22, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Senior Convertible Note, net	$ 7,521		$ 6,655
Convertible Subordinated Debt
Debt Instrument [Line Items]
Principal	17,500		17,500
Unamortized debt discount and debt issuance costs	(3,297)		(3,584)
Debt instrument, unamortized discount (premium), net	(652)		(709)
Senior Convertible Note, net	7,521		6,655
Junior Subordinated Debt
Debt Instrument [Line Items]
Principal	2,400	$ 2,400
Unamortized debt discount and debt issuance costs	(391)	(400)
Unamortized BMF warrant	(840)	(859)
Unamortized conversion feature	(902)	(923)
Unamortized embedded derivatives	(213)	(218)
Senior Convertible Note, net	54	$ 0
Warrant \| Convertible Subordinated Debt
Debt Instrument [Line Items]
Debt instrument, unamortized discount (premium), net	$ (6,030)		$ (6,552)

Unamortized Discount, Conversion Feature

No definition available.

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- Definition

Unamortized Discount, Embedded Derivatives

+ References

No definition available.

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- Definition

Unamortized Discount, Warrant

+ References

No definition available.

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- Definition

The portion of the carrying value of convertible subordinated debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment upon liquidation of the entity's assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

+ References

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-Topic 835
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-Paragraph 2
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- Definition

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.

+ References

No definition available.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
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- Definition

Amount, after accumulated amortization, of debt discount (premium).

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