Debt instrument interest rate additional interest deducted from base rate.

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Debt instrument interest rate base rate.

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Debt instrument number of periodic payment.

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Debt instrument principal payment commencement date.

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Debt instrument principal payment deferred commencement date.

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- Definition

Loan facility extension period.

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Maximum amount of debt conversion.

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Maximum cash proceeds from disposal of equity securities.

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Unrestricted cash and cash equivalents at carrying value.

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The number of warrants issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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- Definition

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

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Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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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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No definition available.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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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No definition available.

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Amount, after accumulated amortization, of debt discount.

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The total amount of long-term liability charges that are being deferred beyond one year.

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The increase (decrease) during the reporting period in the value of expenditures made during the current reporting period for benefits that will be received over a period of years. Deferred charges differ from prepaid expenses in that they usually extend over a long period of time and may or may not be regularly recurring costs of operation.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Loans Payable - Additional Information (Detail)	1 Months Ended					3 Months Ended
Loans Payable - Additional Information (Detail)	Nov. 30, 2018 USD ($) Installment	Dec. 31, 2017 USD ($) Installment shares	Jun. 30, 2017 USD ($)	May 31, 2016 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 31, 2019	Sep. 30, 2019	Aug. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Loan payable, end-of-term payment due						$ 790,000
Maximum amount of debt conversion						2,000,000
Loan payable, interest rate								9.45%	9.70%	9.95%		9.95%	9.70%
Unamortized discount recognized						290,000	$ 400,000
Loans Payable \| Minimum
Debt Instrument [Line Items]
Option to purchase equity, net cash proceeds of equity securities						$ 10,000,000
Hercules Amended Loan Agreement \| Loans Payable
Debt Instrument [Line Items]
Proceeds from additional borrowing capacity					$ 10,000,000
Loan payable, due date						Jan. 02, 2018
Loan payable, end-of-term payment due						$ 500,000
Loan issuance costs paid						$ 200,000
Loan payable, interest rate		11.90%				9.45%
Hercules May 2016 Loan Agreement \| Loans Payable
Debt Instrument [Line Items]
Proceeds from additional borrowing capacity				$ 10,000,000
Loan payable, due date			Dec. 01, 2019
Loan payable, end-of-term payment due			$ 300,000
Loan issuance costs paid			100,000
Loan outstanding principal amount			$ 20,000,000
Loan payable, Commencement date			Jan. 01, 2018
Hercules May 2016 Loan Agreement \| Loans Payable \| Tranche One
Debt Instrument [Line Items]
Proceeds from additional borrowing capacity				$ 5,000,000
Hercules May 2016 Loan Agreement \| Loans Payable \| Tranche Two
Debt Instrument [Line Items]
Proceeds from additional borrowing capacity			$ 5,000,000
Hercules May 2016 Loan Agreement \| Loans Payable \| Minimum \| Financial covenant
Debt Instrument [Line Items]
Unrestricted and unencumbered cash and cash equivalents			$ 10,000,000
2017 Loan Agreement with Hercules
Debt Instrument [Line Items]
Proceeds from additional borrowing capacity		$ 20,000,000
Loan outstanding principal amount						$ 13,800,000
Maximum amount of debt conversion		2,000,000
Refinancing amount		$ 20,000,000
Loan facility maturity period		42 months
Loan facility extension period		24 months
Warrants issued to lenders as part of new loan agreement, shares of common stock to purchase \| shares		0
Loan payable, number of installments of principal and interest \| Installment	24
Loan payable, Commencement date deferred by six months	Aug. 01, 2019
Loan payable, frequency of installments of principal and interest	monthly payments of principal and interest
2017 Loan Agreement with Hercules \| July 2021
Debt Instrument [Line Items]
Approximate payment of principle and interest	$ 900,000
2017 Loan Agreement with Hercules \| Loans Payable
Debt Instrument [Line Items]
Loan payable, due date						Jul. 01, 2021
Loan issuance costs paid		$ 100,000
Loan payable, number of installments of principal and interest \| Installment		29
Loan payable, interest rate						9.45%					10.20%
Loan payable, Commencement date deferred by six months						Feb. 01, 2019
Additional, end-of-term payment		$ 800,000
Loan payable, frequency of installments of principal and interest		monthly payments of principal and interest
Loan payable, interest rate, base rate						9.45%
Loan payable, interest rate, additional rate deducted from base rate						4.75%
Loan payable, description of interest rate terms						Per annum interest is payable on the loan balance at the greater of 9.45% and an amount equal to 9.45% plus the prime rate minus 4.75%, as determined daily, provided however, that the per annum interest rate shall not exceed 15.0%. In 2018, the interest rate increased to 9.70%, 9.95% and 10.20% in June 2018, September 2018 and December 2018, respectively, due to corresponding increases in the prime rate. In 2019, the interest rate decreased to 9.95%, 9.70% and 9.45% in August 2019, September 2019 and October 2019, respectively, due to corresponding decreases in the prime rate
2017 Loan Agreement with Hercules \| Loans Payable \| July 2021
Debt Instrument [Line Items]
Approximate payment of principle and interest		$ 800,000
2017 Loan Agreement with Hercules \| Loans Payable \| Minimum
Debt Instrument [Line Items]
Loan payable, interest rate						9.45%
2017 Loan Agreement with Hercules \| Loans Payable \| Minimum \| Financial covenant
Debt Instrument [Line Items]
Unrestricted and unencumbered cash and cash equivalents		$ 10,000,000
2017 Loan Agreement with Hercules \| Loans Payable \| Maximum
Debt Instrument [Line Items]
Loan payable, interest rate						15.00%