Common stock average closing bid price number of trading days.

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Debt instrument, available date for funding.

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Debt instrument extended date of first required payment.

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Debt instrument final payment fee percentage.

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Debt instrument prepayment fee percentage.

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Debt instrument repayment, number of installments.

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Long term debt maturities final fee due.

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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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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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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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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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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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 rate subject to change from time to time.

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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Debt - Additional Information (Detail) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended
	Jan. 30, 2019 USD ($) Installment $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2018 $ / shares
Debt Instrument [Line Items]
Aggregate principal amount of initial loan advance		$ 13,781	$ 13,781
Warrants issued to purchase shares of common stock \| shares		40,834	40,834
Warrant exercise price \| $ / shares		$ 4.32	$ 4.32	$ 3.77
Term loan, principal outstanding		$ 15,000	$ 15,000
Term loan, final maturity payment		$ 900	$ 900
Loan Agreement [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 25,000
Debt instrument, interest rate terms	Any outstanding principal on the Term Loan Advances will accrue interest at a floating rate equal to the greater of (i) 5.25% per annum and (i) the sum of 2.5% plus the prime rate, as published in the Wall Street Journal. Interest payments are payable monthly following the funding of a Term Loan advance.
Debt instrument, payment terms	The Company will be required to make principal payments on the outstanding balance of the Term Loan Advances commencing on February 1, 2020 (the “Term Loan Amortization Date”) in 36 equal monthly installments, plus interest; provided that if the Company has achieved the milestones described above relating to the availability of the subsequent loan advance on or prior to December 31, 2019, then the Term Loan Amortization Date is automatically extended to February 1, 2021.
Term loan, floating interest rate	5.25%
Term loan, interest rate		7.65%	7.65%
Term loan, frequency of periodic payment	monthly
Term loan, number of repayment installments \| Installment	36
Term loan, periodic principal payment commencement date	Feb. 01, 2020
Term loan, periodic principal payment, extended commencement date	Feb. 01, 2021
Term loan, maturity date	Jan. 01, 2023
Warrant exercise price \| $ / shares	$ 11.02
Common stock average closing bid price number of trading days	10 days
Term loan, final payment fee percentage	6.00%
Term loan, principal outstanding		$ 15,000	$ 15,000
Term loan, unamortized debt issuance costs		1,200	1,200
Term loan, interest expense		$ 400	$ 1,200
Term loan, effective interest rate		12.65%	12.65%
Term loan, final maturity payment		$ 900	$ 900
Loan Agreement [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Term loan, floating interest rate	2.50%
Loan Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Term loan, prepayment fee percentage	1.00%
Loan Agreement [Member] \| Minimum [Member] \| Private Placement or Public Offering [Member]
Debt Instrument [Line Items]
Cash proceeds from an additional equity offering	$ 75,000
Loan Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Term loan, prepayment fee percentage	3.00%
Loan Agreement [Member] \| Initial Loan [Member]
Debt Instrument [Line Items]
Aggregate principal amount of initial loan advance	$ 15,000
Warrants issued to purchase shares of common stock \| shares	40,834
Loan Agreement [Member] \| Subsequent Loan [Member]
Debt Instrument [Line Items]
Aggregate principal amount of subsequent loan advance	$ 10,000
Warrants issued to purchase shares of common stock \| shares	27,222
Loan Agreement [Member] \| Subsequent Loan [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Term loan, available date for funding	Dec. 31, 2019