Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Effect of Anti-dilutive Securities (Detail)

v3.7.0.1
Summary of Significant Accounting Policies - Effect of Anti-dilutive Securities (Detail) - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Effect of Anti-dilutive Securities 5,078,891 5,511,215 3,848,676 5,419,912
Redeemable Convertible Preferred Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Effect of Anti-dilutive Securities   4,828,800   4,783,800
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Effect of Anti-dilutive Securities 2,697,361 682,415 1,682,804 636,112
Warrant [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Effect of Anti-dilutive Securities 2,381,530   2,165,872