NET LOSS PER SHARE - Dilutive Securities Excluded from Calculation of Diluted Earnings Per Share (Detail) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Dilutive securities excluded from calculation of diluted earnings per share	20,775,509	22,029,648
Stock Options Outstanding
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Dilutive securities excluded from calculation of diluted earnings per share	8,096,905	10,412,952
Warrants To Purchase Common Stock - Liability Classified
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Dilutive securities excluded from calculation of diluted earnings per share	2,042,992	2,156,153
Warrants To Purchase Common Stock - Equity Classified
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Dilutive securities excluded from calculation of diluted earnings per share	1,418,116	1,457,856
Unvested Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Dilutive securities excluded from calculation of diluted earnings per share	9,217,496	8,002,687