Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Summary Of Significant Accounting Policies [Line Items]        
Total potentially dilutive securities 5,990,698 6,876,595 5,990,698 6,876,595
Warrant Issued to Private Investors [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Total potentially dilutive securities 3,284,789 4,702,354 3,284,789 4,702,354
Employee Stock Option [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Total potentially dilutive securities 550,985 566,753 550,985 566,753
Restricted Stock Units (RSUs) [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Total potentially dilutive securities 1,533,247 1,607,488 1,533,247 1,607,488
Performance Share Units [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Total potentially dilutive securities 621,677   621,677