Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Detail)

v3.20.1
Stockholders' Equity (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Mar. 23, 2020
USD ($)
$ / shares
shares
Feb. 11, 2020
USD ($)
$ / shares
shares
Mar. 31, 2018
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
May 23, 2019
$ / shares
shares
Class of Stock [Line Items]            
Number of shares for purchase under warrant (in shares) 9,000,000.0         1,500,000
Common stock purchase price (in dollars per share) | $ / shares $ 1.00         $ 10.00
Warrant term (in years)       5 years    
Fair value of warrant | $ $ 3,600          
Warrant liability | $       $ 2,384 $ 0  
Conversion ratio       1    
Term loan | Amended 2019 Term Loan            
Class of Stock [Line Items]            
Increase of warrant fair value | $ $ 300          
At-the-Market Program            
Class of Stock [Line Items]            
Net proceeds from sale of stock | $       $ 100    
Number of common stock issued (in shares)       142,119    
Sale of stock, remaining availability for sale amount | $       $ 389,200    
Common Stock            
Class of Stock [Line Items]            
Number of shares sold in transaction (in shares)   2,114,591        
Sale of stock, price per share (in dollars per share) | $ / shares   $ 6.36        
Net proceeds from sale of stock | $   $ 13,100        
Convertible Preferred Stock            
Class of Stock [Line Items]            
Number of shares sold in transaction (in shares)     6,100,000      
Immediately            
Class of Stock [Line Items]            
Number of shares for purchase under warrant (in shares) 3,000,000          
September 23, 2020            
Class of Stock [Line Items]            
Number of shares for purchase under warrant (in shares) 2,000,000          
March 23, 2021            
Class of Stock [Line Items]            
Number of shares for purchase under warrant (in shares) 2,000,000          
June 23, 2021            
Class of Stock [Line Items]            
Number of shares for purchase under warrant (in shares) 2,000,000