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)

v3.10.0.1
Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities 6,161,356 7,324,400
Financing Warrant to Purchase Common Stock [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities   13,889
IPO Warrants to Purchase Common Stock [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities   11,600
Warrant Issued to Private Investors [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities 3,035,688 3,035,688
Employee Stock Option [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities 656,494 1,037,239
Restricted Stock Units (RSUs) [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities 2,469,174 2,274,327
Performance Share Units [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total potentially dilutive securities   951,657