Stockholders' Equity - Additional Information (Detail)			6 Months Ended
	Apr. 07, 2021 USD ($) $ / shares shares	May 05, 2020 USD ($) $ / shares shares	Jun. 30, 2021 USD ($) $ / shares shares	Feb. 11, 2021 shares	Feb. 08, 2017 $ / shares shares
Stockholders Equity [Line Items]
Proceeds from the sale of common stock, net of issuance costs | $			$ 37,715,000
EWB Warrant
Stockholders Equity [Line Items]
Warrants issued to purchase common stock | shares					40,000
Warrant exercise price					$ 3.64
Warrants or exercised received for common shares | shares				27,599
Warrants and rights outstanding | $		$ 42,000
Legal and administrative cost | $		$ 92,000
EWB Warrant | Estimated Volatility
Stockholders Equity [Line Items]
Warrants measurement input		63.2
EWB Warrant | Risk Free Interest Rate
Stockholders Equity [Line Items]
Warrants measurement input		0.24
EWB Warrant | Dividend Yield
Stockholders Equity [Line Items]
Warrants measurement input		0
EWB Warrant | Expected Life
Stockholders Equity [Line Items]
Warrants outstanding term		3 years
April 21 Funds Warrants
Stockholders Equity [Line Items]
Warrants issued to purchase common stock | shares		275,000
Warrant exercise price			$ 3.50
Warrants outstanding term		3 years
April 21 Funds Warrants | Estimated Volatility
Stockholders Equity [Line Items]
Warrants measurement input		63.2
April 21 Funds Warrants | Risk Free Interest Rate
Stockholders Equity [Line Items]
Warrants measurement input		0.24
April 21 Funds Warrants | Dividend Yield
Stockholders Equity [Line Items]
Warrants measurement input		0
April 21 Funds Warrants | Expected Life
Stockholders Equity [Line Items]
Warrants outstanding term		3 years
Common Stock
Stockholders Equity [Line Items]
Common stock sold | shares	3,779,342
Offering price	$ 10.65
Proceeds from the sale of common stock, net of issuance costs | $	$ 37,700,000
Offering related expenses | $	$ 2,500,000
Series B Convertible Preferred Stock
Stockholders Equity [Line Items]
Minimum conversion price			$ 3.27
Dividend payment terms			Each share of Series B convertible preferred stock is entitled to a cumulative annual dividend of 5% for the first six (6) years following the issuance of such share and 3% for each year thereafter, with the Company retaining the option to settle each year’s dividend after the tenth (10th) year in cash. The dividends accrue and are payable in kind upon such time as the shares convert into the Company’s common stock
Cumulative annual dividend for first six years			5.00%
Cumulative annual dividend for each year after sixth year			3.00%
Price per share distributable to stockholders			$ 4.00
Series B Convertible Preferred Stock | Common Stock
Stockholders Equity [Line Items]
Preferred stock shares convertible into common stock | shares			5,884,594
Maximum | EWB Warrant
Stockholders Equity [Line Items]
Warrant exercise price		$ 3.50
Warrant expiration date		Feb. 08, 2023
Maximum | Common Stock
Stockholders Equity [Line Items]
Shares issued, price per share			$ 4.00
Minimum | EWB Warrant
Stockholders Equity [Line Items]
Warrant exercise price					$ 3.64
Warrant expiration date		Feb. 08, 2022