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Organization, Business, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Securities Not Considered for Calculation of Diluted Net Loss Per Share (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities not considered for calculation of diluted net loss per share 709,354 1,476,719 709,354 1,476,719
Class X Preferred Stock (if-converted to common stock) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities not considered for calculation of diluted net loss per share   587,445   587,445
Common Stock Warrants [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities not considered for calculation of diluted net loss per share 13,904 477,639 13,904 477,639
Common Stock Options and Restricted Stock Units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities not considered for calculation of diluted net loss per share 693,670 409,568 693,670 409,568
Employee Stock Purchase Plan [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities not considered for calculation of diluted net loss per share 1,780 2,067 1,780 2,067