Capital Structure - Summary of Common Stock Reserved for Future Issuance (Detail) - shares	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common Stock reserved for future issuance	14,245,213	4,351,873
Two Thousand Fourteen Omnibus IncentivePlan [Member]
Class of Stock [Line Items]
Common Stock reserved for future issuance	41,079	101,625
Stock Options [Member]
Class of Stock [Line Items]
Common Stock reserved for future issuance	1,853,841	1,216,338
Warrants [Member]
Class of Stock [Line Items]
Common Stock reserved for future issuance	12,350,293	3,033,910