Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)

v3.21.1
Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities 5,256,942 6,739,639
Warrants Issued to Private Investors [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities 3,284,789 3,938,802
Employee Stock Option [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities 550,985 550,985
Restricted Stock Units (RSUs) [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities 1,421,168 1,821,852
Performance Share Units [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities   428,000