Preferred Stock, Common Stock and Stockholders' Equity - Common Stock - Additional Information (Detail) - USD ($)	1 Months Ended	2 Months Ended	12 Months Ended
	Jan. 31, 2021	Feb. 28, 2022	Dec. 31, 2021	Dec. 31, 2020	Nov. 30, 2017
Sale Of Common Stock [Line Items]
Common stock, shares outstanding			32,656,480	26,621,954
Shareholders voting power description			Each share of common stock is entitled to one vote. The holders of the common stock are also entitled to receive dividends whenever funds are legally available and when declared by the board of directors of the Company.
Dividends declared on common stock			$ 0
Common stock, shares issued			32,656,480	26,621,954
Proceeds from issuance of common stock, net			$ 13,070,154
Public Offering [Member]
Sale Of Common Stock [Line Items]
Common stock, shares issued	5,750,000
Shares issued, price per share	$ 2.50
Proceeds from issuance of common stock, net	$ 14,400,000
Proceeds from issuance of common stock net of underwriting discounts and commissions and offering expenses	$ 13,100,000
FBR Sales Agreement [Member]
Sale Of Common Stock [Line Items]
Common stock, shares issued			0	1,490,813
Proceeds from issuance of common stock, net				$ 3,600,000
Common stock , weighted average price per share				$ 2.46
FBR Sales Agreement [Member] | Maximum [Member]
Sale Of Common Stock [Line Items]
Common stock, value of shares issuable					$ 16,000,000.0
ATM Sales Agreement [Member]
Sale Of Common Stock [Line Items]
Common stock, shares issued			217,100
Proceeds from issuance of common stock, net			$ 313,000
Common stock , weighted average price per share			$ 1.47
ATM Sales Agreement [Member] | Subsequent Event
Sale Of Common Stock [Line Items]
Common stock, shares issued		261,421
Proceeds from issuance of common stock, net		$ 172,000
Common stock , weighted average price per share		$ 0.67
ATM Sales Agreement [Member] | Maximum [Member]
Sale Of Common Stock [Line Items]
Available for the issuance of common stock				$ 30,000,000