Deemed Dividend Payable On Exchange Of Preferred Stock

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Equity Distribution Agreement, Aggregate Amount Of Shares Authorized For Offer Or Sale, Maximum

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Stock Issued During Period, Shares, Warrants Exercised

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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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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Face amount or stated value per share of common stock.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

The cash outflow to reacquire preferred stock during the period.

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Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

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Cash received on stock transaction after deduction of issuance costs.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Number of new stock issued during the period.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Private Placements and Public Offering (Details) - USD ($) $ / shares in Units, $ in Thousands							1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 03, 2021	May 12, 2020	Mar. 31, 2020	Mar. 06, 2020	Mar. 28, 2019	Aug. 06, 2018	Jan. 31, 2021	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Jan. 25, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Number of shares issued (in shares)							1,516,073
Common stock, par value (in dollars per share)									$ 0.001			$ 0.001
Proceeds from the exercise of warrants								$ 1,900	$ 0	$ 1,861
Exercise of warrants (shares)								338,454
Proceeds from sale of stock							$ 29,400
Purchase price (in dollars per share)							$ 20.11
Preferred stock issued during the period									0	25,000
Payments repurchase of preferred stock									0	2,354
Deemed dividend on exchange of Series E Preferred Stock for common stock									$ 1,104	$ 0
2018 Warrants
Class of Stock [Line Items]
Number of shares issued (in shares)						12,062,000
Common stock, par value (in dollars per share)						$ 0.001
Number of additional shares from warrants (in shares)						4,221,700
Initial exercise price of warrants (in dollars per share)					$ 2.52
Proceeds from the exercise of warrants					$ 10,600
2019 Warrants
Class of Stock [Line Items]
Number of additional shares from warrants (in shares)					2,500,000
Initial exercise price of warrants (in dollars per share)					$ 7.00
Canaccord Genuity LLC
Class of Stock [Line Items]
Equity Distribution Agreement, maximum aggregate amount authorized for offer or sale											$ 40,000
Series E preferred stock
Class of Stock [Line Items]
Issuance of shares (shares)				25,000
Preferred stock issued during the period				$ 25,000
Stock repurchased (in shares)		2,330
Payments repurchase of preferred stock		$ 2,400
Shares of preferred stock exchanged	10,000
Series E preferred stock \| South Ocean Funding LLC
Class of Stock [Line Items]
Issuance of shares (shares)			2,330
Common shares
Class of Stock [Line Items]
Common stock issued in exchange for preferred stock	1,525,207