Long-Term Debt - Additional Information (Detail) - USD ($)		9 Months Ended
Jun. 06, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Advance of funded upon execution of loan agreement		$ 25,000,000
Carrying value of long term debt		$ 24,791,214
Hercules Capital, Inc [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Long-tem debt, face amount	$ 35,000,000
Advance of funded upon execution of loan agreement	$ 25,000,000
Debt Instrument, covenant description		Under the terms of the Loan Agreement, the Company may, but is not obligated to, request one or more additional advances of at least $5,000,000 not to exceed $10,000,000 in the aggregate, subject to the Company achieving certain corporate milestones and satisfying customary conditions.
Debt instrument, maturity date Description		The Term Loan is secured by substantially all of the Company’s assets, excluding intellectual property, and will mature on July 1, 2022
Debt instrument, maturity date	Jul. 01, 2022
Debt Instrument, interest rate		8.75%
Debt instrument, payment terms		Payments under the Loan Agreement are interest only until the first principal payment is due on August 1, 2019, provided that the interest only period may be extended to February 1, 2020 if the Company achieves certain corporate milestones.
Debt instrument, first pricipal payment due date		Aug. 01, 2019
Debt instrument, first pricipal payment may be extended date		Feb. 01, 2020
Percentage of loan fee on original principal amount		4.25%
Carrying value of long term debt		$ 24,791,214
Principal balance outstanding		25,000,000
Term charge accrual		66,406
Unamortized debt issuance costs		$ 275,192
Hercules Capital, Inc [Member] \| Term Loan [Member] \| Prime Based Variable Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, variable interest rate	9.50%
Hercules Capital, Inc [Member] \| Term Loan [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Prepayment fee percentage on principal loan prepaid		1.00%
Hercules Capital, Inc [Member] \| Term Loan [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Prepayment fee percentage on principal loan prepaid		3.00%
Hercules Capital, Inc [Member] \| Term Loan [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Amount of additional advances Company may request	$ 5,000,000
Hercules Capital, Inc [Member] \| Term Loan [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Amount of additional advances Company may request	$ 10,000,000

Debt instrument extented date of first required amount.

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Percentage of loan fee on original principal amount.

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Prepayment fee percentage on principal loan prepaid

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Amount of accumulated amortization of debt issuance costs.

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

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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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Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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

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

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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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 of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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