Common Stock, Closing Bid Price

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- Definition

Liquidity and Capital Resources [Line Items]

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No definition available.

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- Definition

Number of Consecutive Business Days

+ References

No definition available.

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- Definition

Period to Regain Nasdaq Minimum Bid Requirements

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No definition available.

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- Definition

Represents the monetary amount of working capital, as of the indicated date.

+ References

No definition available.

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- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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- Definition

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Liquidity and Capital Resources (Details) $ / shares in Units, $ in Thousands	5 Months Ended	9 Months Ended
	Dec. 08, 2021 businessDay $ / shares	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Liquidity and Capital Resources [Line Items]
Accumulated deficit		$ (361,139)				$ (337,406)
Stockholders' equity		11,094	$ 42,075	$ 18,203	$ 26,178	$ 34,170	$ 16,211	$ 21,774	$ 20,320
Cash, cash equivalents and investments available-for-sale		33,200
Working capital		24,300
Net cash used in operating activities		$ (24,508)	$ (21,072)
Subsequent event
Liquidity and Capital Resources [Line Items]
Period to regain Nasdaq minimum bid requirements	180 days
Common stock, closing bid price (at least) (in dollars per share) \| $ / shares	$ (1.00)
Number of consecutive business days (minimum) \| businessDay	10