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Commission rate equal to gross proceeds.

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Common stock shares subscriptions terminated

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Stock issued during period Additional share of common stock 1.

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Monetary value of common stock allocated to investors to buy shares of a new issue of common stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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Describes the terms of a significant arrangement with a supplier (excluding an unconditional purchase obligation) to acquire goods or services over a period of time beyond one year or the normal operating cycle, if longer, which may include identification of the goods or services to be purchased, pricing, effects on pricing of failing to reach minimum quantities required to be purchased, cancellation rights, and termination provisions.

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Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow from the additional capital contribution to the entity.

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Per share or per unit amount of equity securities issued.

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Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended
	Sep. 30, 2020	Feb. 29, 2020	Mar. 31, 2021	Nov. 30, 2020	Mar. 10, 2020	May 31, 2019
Aspire Capital [Member]
Class Of Stock [Line Items]
Shares issued during the period			3,000,000
Shares issued, price per share			$ 5.09
Net proceeds from issuance of common stock			$ 15,200,000
Long-term purchase commitment, period	30 months
Long-term purchase commitment, description	upon the terms and subject to the conditions and limitations set forth therein, Aspire Capital is committed to purchase up to an aggregate of $20.0 million of shares of our common stock at our request from time to time during the 30 month term of the Purchase Agreement.
Maximum [Member] \| Aspire Capital [Member]
Class Of Stock [Line Items]
Commitment to purchase shares	$ 20,000,000
A T M Offering Program \| Jones Trading Institutional Services L L C
Class Of Stock [Line Items]
Commission rate equal to gross proceeds			3.00%
A T M Offering Program \| Sale Agreement [Member] \| Maximum [Member] \| Jones Trading Institutional Services L L C
Class Of Stock [Line Items]
Agreed upon value of sale of common stock per transaction						$ 25,000,000
A T M Offering Program \| H.C. Wainwright & Co., LLC [Member]
Class Of Stock [Line Items]
Commission rate equal to gross proceeds						3.00%
Terminated value of sale of common stock			$ 20,000,000
Shares issued, price per share			$ 4.99
Net proceeds from issuance of common stock			$ 9,600,000
A T M Offering Program \| H.C. Wainwright & Co., LLC [Member] \| Sale Agreement [Member] \| Maximum [Member]
Class Of Stock [Line Items]
Agreed upon value of sale of common stock per transaction				$ 20,000,000		$ 10,000,000
A T M Offering Program \| Common Stock [Member] \| H.C. Wainwright & Co., LLC [Member]
Class Of Stock [Line Items]
Shares issued during the period			1,988,254
Public Offering [Member]
Class Of Stock [Line Items]
Net proceeds from issuance of common stock		$ 20,700,000
Public Offering [Member] \| Common Stock [Member]
Class Of Stock [Line Items]
Shares issued during the period		4,235,294
Shares issued, price per share		$ 4.25
Issuance of additional share of common stock					635,294