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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Summary Of Significant Accounting Policies [Line Items]        
Total potentially dilutive securities 6,945,580 7,228,185 6,945,580 7,228,185
Warrant Issued to Private Investors [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Total potentially dilutive securities 3,938,802 4,702,354 3,938,802 4,702,354
Employee Stock Option [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Total potentially dilutive securities 550,985 576,293 550,985 576,293
Restricted Stock Units (RSUs) [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Total potentially dilutive securities 1,822,116 1,949,538 1,822,116 1,949,538
Performance Share Units [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Total potentially dilutive securities 633,677   633,677