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)

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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Summary Of Significant Accounting Policies [Line Items]        
Potentially dilutive securities 7,403,916 7,532,800 7,403,916 7,532,800
Financing Warrant to Purchase Common Stock [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Potentially dilutive securities   13,889   13,889
IPO Warrants to Purchase Common Stock [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Potentially dilutive securities   11,600   11,600
Investor Relations Consulting Warrant [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Potentially dilutive securities   7,950   7,950
Investor Relations Incentive Warrant [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Potentially dilutive securities   15,000   15,000
Warrant Issued to Private Investors [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Potentially dilutive securities 3,035,688 2,381,675 3,035,688 2,381,675
Employee Stock Option [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Potentially dilutive securities 856,635 1,153,966 856,635 1,153,966
Restricted Stock Units (RSUs) [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Potentially dilutive securities 2,640,034 2,795,103 2,640,034 2,795,103
Performance Share Units [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Potentially dilutive securities 871,559 1,153,617 871,559 1,153,617