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Stockholders' Equity - Schedule of Warrant Activity (Detail)
 9 Months Ended
Sep. 30, 2020
shares
Class Of Warrant Or Right [Line Items]  
Beginning Balance 392,815
Issued 402,397
Exercised (427,877)
Cancelled/Expired 0
Ending Balance 367,335
Anelixis [Member]  
Class Of Warrant Or Right [Line Items]  
Beginning Balance 0
Assumed and replaced 55,583.875
Exercised 0
Cancelled/Expired 0
Ending Balance 55,583.875
Registered Direct Warrants, Series A [Member]  
Class Of Warrant Or Right [Line Items]  
Beginning Balance 191,617
Issued 0
Exercised (191,617)
Cancelled/Expired 0
Ending Balance 0
Registered Direct Warrants, Series B [Member]  
Class Of Warrant Or Right [Line Items]  
Beginning Balance 191,617
Issued 0
Exercised (191,617)
Cancelled/Expired 0
Ending Balance 0
Registered Direct Warrants, Placement Agent [Member]  
Class Of Warrant Or Right [Line Items]  
Beginning Balance 9,581
Issued 0
Exercised 0
Cancelled/Expired 0
Ending Balance 9,581
Private Placement Warrants [Member]  
Class Of Warrant Or Right [Line Items]  
Beginning Balance 0
Issued 383,235
Exercised (44,643)
Cancelled/Expired 0
Ending Balance 338,592
Private Placement Warrants, Placement Agent [Member]  
Class Of Warrant Or Right [Line Items]  
Beginning Balance 0
Issued 19,162
Exercised 0
Cancelled/Expired 0
Ending Balance 19,162
Warrants Assumed and Replaced in Acquisition [Member] | Anelixis [Member]  
Class Of Warrant Or Right [Line Items]  
Beginning Balance 0
Assumed and replaced 55,583.875
Exercised 0
Cancelled/Expired 0
Ending Balance 55,583.875