Stockholders' Equity - Schedule of Outstanding Series C Preferred Stock Warrants (Detail) - Series C Warrants [Member]	Dec. 31, 2020 $ / shares shares
Issued warrants to underwriters	2,504
Issuance of Preferred Series C-1 Agent Warrants [Member]
Issued warrants to underwriters	1,959
Warrants exercise price \| $ / shares	$ 1.16
Issuance of Preferred Series C-2 Agent Warrants [Member]
Issued warrants to underwriters	219
Warrants exercise price \| $ / shares	$ 1.21
Issuance of Preferred Series C-3 Agent Warrants [Member]
Issued warrants to underwriters	326
Warrants exercise price \| $ / shares	$ 1.15