WARRANTS - Schedule of Key Terms of Placement Warrants (Detail)	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Warrants Exercised	119,420
Warrants Outstanding	2,036,733
2017 Placement Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Issuance Date	2017-01
Term	7 years
Exercise Price Per Share | $ / shares	$ 3.17
Warrants Exercised	118,868
Warrants Outstanding	1,500,022
2016 Placement Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Issuance Date	August and September 2016
Term	7 years
Exercise Price Per Share | $ / shares	$ 2.95
Warrants Exercised	552
Warrants Outstanding	536,711