Equity Transactions - Rights Offering - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Mar. 05, 2020	Feb. 11, 2020	Dec. 31, 2021	Dec. 31, 2020
Class Of Stock [Line Items]
Common stock, par value			$ 0.001	$ 0.001
Aggregate issuance costs			$ 248	$ 953
Common Stock [Member]
Class Of Stock [Line Items]
Issuance of Common Stock, conversion of Preferred Stock to Common Stock				$ 2
Issuance of stock, shares	1,046,249		475,469	8,025,119
Aggregate issuance costs				$ 700
Series C Preferred Stock [Member]
Class Of Stock [Line Items]
Issuance of Common Stock, conversion of Preferred Stock to Common Stock	$ 20,600	$ 30,000
Right to purchase common stock shares		0.152
Common stock, par value		$ 9.00
Issuance of stock, shares	2,287
Aggregate issuance costs	$ 100
Share price	$ 9.22
Intrinsic value of beneficial conversion feature				$ 500
Common Stock and Series C Preferred Stock [Member]
Class Of Stock [Line Items]
Issuance of Common Stock, conversion of Preferred Stock to Common Stock	$ 30,000
Amount of agreed to purchase offered shares and not subscribed shares value under rights offering			$ 30,000
Aggregate issuance costs	$ 500
Series A Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Issuance of stock, shares			2,220
Share price	$ 8.98