Debt instrument amortization period.

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- Definition

Debt Instrument, Covenant Terms, Unrestricted Cash

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Debt instrument interest only payment period.

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- Definition

Debt instrument redemption price amount.

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- Definition

Debt instrument repayment period after interest only period.

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Line of credit facility non milestone based minimum advances available.

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Line Of Credit Facility, Prepayment Fee, Amount

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- Definition

Line Of Credit Facility, Termination Fees, Amount

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- Definition

Long term debt percentage bearing fixed interest paid in kind percentage.

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Percentage of maintained cash and investment property in accounts of aggregate cash of parent and subsidiaries.

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- Definition

Percentage of outstanding principal balance of term loan required to be maintained.

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No definition available.

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- Definition

Percentage of prepayment fee.

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No definition available.

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- Definition

Warrant expiration period.

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No definition available.

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- Definition

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

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- Definition

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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- Definition

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

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No definition available.

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- Definition

Amount of assets pledged to secure a debt instrument.

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- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

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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.

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No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount.

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- Definition

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

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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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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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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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Notes Payable - Additional Information (Detail) - USD ($)					9 Months Ended		12 Months Ended
	Nov. 04, 2019	Jul. 10, 2019	May 23, 2018	May 10, 2017	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Apr. 30, 2019	Oct. 23, 2018	Apr. 28, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Minimum advances available under facility								$ 5,000,000.0
Debt covenant, unrestricted cash					$ 7,000,000.0
Loss on extinguishment of notes payable					$ 0	$ (1,400,000)
Issue of warrants to purchase shares of company's common stock (in shares)										24,900,000
Notes Payable
Debt Instrument [Line Items]
Debt issuance cost											$ 300,000
Hercules Loan Agreement
Debt Instrument [Line Items]
Reduction of indebtedness		$ 15,000,000.0
Loan amount outstanding		$ 30,000,000.0
Debt discount liability, facility fee recorded as debt discount							$ 300,000
Debt instrument, redemption price amount							700,000
Hercules Loan Agreement \| Notes Payable \| Interest Expense
Debt Instrument [Line Items]
Loss on extinguishment of notes payable							(1,400,000)
Hercules Loan Agreement \| Term Loan
Debt Instrument [Line Items]
Term loans aggregate principal amount			$ 40,000,000.0
Debt instrument repayment period after interest only period			18 months
Debt instrument amortization period			18 months
Debt issuance costs recorded as debt discount			$ 1,100,000
Debt discount liability, facility fee recorded as debt discount			$ 400,000
Prepayment fee percentage			6.95%
Percentage outstanding principal balance of term loans required to be maintained			120.00%
Percentage of maintained cash and investment property in accounts of aggregate cash of parent and subsidiaries			80.00%
Amount of investment to any future equity offering			$ 2,000,000.0
Hercules Loan Agreement \| Term Loan \| Fixed Rate and Prime Rate
Debt Instrument [Line Items]
Term loans interest rate			5.00%
Hercules Loan Agreement \| Term Loan \| Maximum
Debt Instrument [Line Items]
Term loans fixed interest rate			10.05%
Hercules Loan Agreement \| Term Loan \| First Year After Initial Funding Date
Debt Instrument [Line Items]
Prepayment fee percentage			3.00%
Hercules Loan Agreement \| Term Loan \| Second Year After Initial Funding Date
Debt Instrument [Line Items]
Prepayment fee percentage			2.00%
Hercules Loan Agreement \| Term Loan \| Second Year After Initial Funding Date And Thereafter
Debt Instrument [Line Items]
Prepayment fee percentage			1.00%
Hercules Loan Agreement \| Term Loan \| First Tranche
Debt Instrument [Line Items]
Term loans aggregate principal amount			$ 20,000,000.0
Hercules Loan Agreement \| Term Loan \| Tranche Two
Debt Instrument [Line Items]
Term loans aggregate principal amount									$ 10,000,000.0
Hercules Loan Agreement \| Term Loan \| Tranche Four
Debt Instrument [Line Items]
Term loans aggregate principal amount								$ 20,000,000.0
Loan and Security Agreement \| Term Loan
Debt Instrument [Line Items]
Debt issuance costs recorded as debt discount				$ 1,200,000
Warrant expiration period				5 years
Loan and Security Agreement \| Term Loan \| Innovatus Life Sciences Lending Fund I, LP
Debt Instrument [Line Items]
Term loans aggregate principal amount				$ 17,000,000.0
Debt instrument repayment period after interest only period				2 years
Debt instrument amortization period				24 months
Term loans fixed interest rate				11.00%
Interest only payment period				24 months
Term loans fixed interest rate, paid in-kind percentage				2.50%
Loan and Security Agreement \| Term Loan \| First Tranche
Debt Instrument [Line Items]
Debt discount liability, facility fee recorded as debt discount				$ 200,000
Warrants, exercise price (in dollars per share)				$ 1.00
Unamortized debt discount							$ 0
Loan and Security Agreement \| Term Loan \| First Tranche \| Innovatus Life Sciences Lending Fund I, LP
Debt Instrument [Line Items]
Term loans aggregate principal amount				$ 14,000,000.0
Loan and Security Agreement \| Term Loan \| First Tranche \| Maximum
Debt Instrument [Line Items]
Issue of warrants to purchase shares of company's common stock (in shares)				1,244,746
Subsequent Event
Debt Instrument [Line Items]
Termination fees	$ 16,400,000
Prepayment fee	$ 1,400,000