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Common and Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2021
Feb. 28, 2021
Feb. 28, 2018
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Oct. 01, 2021
Nov. 30, 2020
Aug. 31, 2019
Class of Stock [Line Items]                        
Common stock, shares authorized       400,000,000   400,000,000   400,000,000        
Common stock, par value       $ 0.01   $ 0.01   $ 0.01        
Undesignated preferred stock, shares authorized       10,000,000   10,000,000   10,000,000        
Undesignated preferred stock, par value       $ 0.01   $ 0.01   $ 0.01        
Common stock, shares issued       250,245,831   242,117,089   250,245,831        
Common stock, shares outstanding       250,245,831   242,117,089   250,245,831        
Preferred stock, shares outstanding       0   0   0        
Debt issuance amount $ 230,000                      
Proceeds from market price stock purchase       $ 0     $ 0 $ 106 $ 14      
Market price stock purchase plan               25,000        
MidCap Credit Facility                        
Class of Stock [Line Items]                        
Shares issued                     111,853 1,171,614
MidCap Credit Facility | Subsequent Event                        
Class of Stock [Line Items]                        
Common stock, shares issued                   964,113    
Shares issued                   1,283,467    
Convertible Promissory Note | Mann Group                        
Class of Stock [Line Items]                        
Conversion of notes accrued interest to common shares, value         $ 400              
Debt issuance amount         $ 9,600 $ 7,000   $ 9,600        
Conversion of notes to common shares, shares         4,000,000 2,800,000   4,000,000        
2024 Convertible Notes                        
Class of Stock [Line Items]                        
Debt issuance amount   $ 5,000                    
Conversion of notes to common shares, shares   1,666,667                    
Controlled Equity Offering Sales Agreement | Cantor Fitzgerald                        
Class of Stock [Line Items]                        
Stock sales agreements date     Feb. 28, 2018                  
Controlled Equity Offering Sales Agreement | Cantor Fitzgerald | Common Stock | Maximum                        
Class of Stock [Line Items]                        
Amount of net proceeds from issuance of securities     $ 50,000                  
At Market Issuance Sales Agreement | Cantor Fitzgerald | Common Stock                        
Class of Stock [Line Items]                        
Amount of net proceeds from issuance of securities               $ 1,900 $ 15,600      
Number of shares sold during the period               578,063 9,401,827      
At Market Issuance Sales Agreement | Cantor Fitzgerald | Common Stock | Weighted Average                        
Class of Stock [Line Items]                        
Exchange price per share       $ 3.26     $ 1.66 $ 3.26 $ 1.66