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- Definition

Stock Issued During Period, Shares, Warrants Exercised

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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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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Percentage of principal amount of debt redeemed.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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- Definition

Fair value portion of warrants not settleable in cash classified as equity.

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Long Term Debt (Details) - USD ($)			1 Months Ended
Long Term Debt (Details) - USD ($)	Nov. 27, 2019	Feb. 02, 2017	Apr. 30, 2020	Aug. 31, 2017
Debt Instrument [Line Items]
Exercise of warrant (in shares)				16,228
Common Shares
Debt Instrument [Line Items]
Number of shares for which warrants are exercisable (in shares)		34,260
Exercise price of warrants (in dollars per share)		$ 96.32
Fair value of warrants		$ 2,300,000
Term Loan \| Loan and Security Agreement with Hercules Capital, Inc.
Debt Instrument [Line Items]
Amount borrowed		55,000,000
Debt instrument, redemption price, percentage of principal amount redeemed	50.00%
Repayments of debt	$ 15,700,000
Transaction costs		$ 1,500,000
Loan term		48 months
Term Loan \| Loan and Security Agreement with Hercules Capital, Inc. \| Minimum
Debt Instrument [Line Items]
Fixed interest rate	11.55%	10.55%
Term Loan \| Loan and Security Agreement with Hercules Capital, Inc. \| Prime Rate
Debt Instrument [Line Items]
Variable interest rate	6.80%	6.80%
Subsequent Event \| Term Loan \| Loan and Security Agreement with Hercules Capital, Inc.
Debt Instrument [Line Items]
Repayments of debt			$ 15,700,000
Accrued interest, fees and other amounts			$ 300,000