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Stockholders' Equity - Additional Information (Details)
 9 Months Ended 12 Months Ended
Feb. 05, 2021
USD ($)
shares
Jan. 25, 2021
USD ($)
$ / shares
shares
Oct. 01, 2020
USD ($)
$ / shares
item
D
shares
Sep. 30, 2021
USD ($)
director
$ / shares
shares
Sep. 30, 2020
USD ($)
director
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Class of Stock [Line Items]            
Common stock, shares authorized       100,000,000   100,000,000
Stock Issued During Period, Value, Issued for Services | $       $ 11,500 $ 62,000  
Preferred stock, par value per share (in dollars per share) | $ / shares       $ 0.001   $ 0.001
Preferred stock, shares authorized       2,500,000   2,500,000
Common stock, par value per share (in dollars per share) | $ / shares     $ 0.001 $ 0.001   $ 0.001
Dividends, paid-in-kind | $       $ 6,200,000   $ 2,500,000
Deemed dividend | $     $ 39,500,000      
Series C Preferred stock conversion expenses | $ $ 1,800,000          
Proceeds from public offering, net of offering costs | $       $ 269,825,000    
Common stock, shares issued       46,207,566   39,837,058
Common stock issued upon conversion of senior notes       4,810,002    
Warrants [Member]            
Class of Stock [Line Items]            
Common stock issued upon conversion of senior notes       17,800,000    
Director [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Shares, Issued for Services       229 2,400  
Number of Members | director       1 2  
Class A convertible preferred stock [Member]            
Class of Stock [Line Items]            
Preferred stock, par value per share (in dollars per share) | $ / shares       $ 0.001   $ 0.001
Preferred stock, shares authorized       800,000   800,000
Class B convertible preferred stock [Member]            
Class of Stock [Line Items]            
Preferred stock, par value per share (in dollars per share) | $ / shares       $ 0.001   $ 0.001
Preferred stock, shares authorized       585,000   585,000
Class C convertible preferred stock            
Class of Stock [Line Items]            
Stock issued during period, new issues (in shares) 50,000          
Preferred stock, dividend rate (as a percent)       4.00%    
Preferred stock, par value per share (in dollars per share) | $ / shares       $ 0.001   $ 0.001
Preferred stock, shares authorized       250,000   250,000
Dividends, paid-in-kind | $           $ 300,000
Liquidation preference (in dollars per share) | $ / shares     $ 1,000      
Conversion price (in dollars per share) | $ / shares     $ 38.6152      
Conversion rate | $ / shares     25.90      
Shares to be issued upon conversion     6,474,135      
Threshold trading days for conversion of preferred stock | D     20      
Threshold consecutive trading days for conversion of preferred stock | D     30      
Stock price trigger as a percentage of conversion price for conversion of preferred stock     150.00%      
Dividend rate on shares not repurchased     5.50%      
Number of member to the board of directors who can be elected by the preferred stock holders | item     1      
Percentage of stock to be held to exercise the right to nominate member of board of directors     66.67%      
Class C convertible preferred stock | Prior to the 180-day anniversary of October 1, 2020            
Class of Stock [Line Items]            
Number of shares to be redeemed 50,000          
Class C convertible preferred stock | At any time beginning five years after Closing Date (but prior to six years after the Closing Date)            
Class of Stock [Line Items]            
Redemption price (as a percent)     105.00%      
Class C convertible preferred stock | At any time beginning six years after Closing Date            
Class of Stock [Line Items]            
Redemption price (as a percent)     100.00%      
Common Stock [Member]            
Class of Stock [Line Items]            
Shares to be issued upon conversion 1,312,860          
Private Placement            
Class of Stock [Line Items]            
Proceeds from issuance of common stock, net of issuance costs | $     $ 25,000,000.0      
Aggregate purchase price | $     275,000,000.0      
Reimbursement of transactional expenses | $     1,000,000.0      
Net proceeds from private placement | $     265,400,000      
Direct and incremental expenses | $     $ 8,600,000      
Private Placement | Class C convertible preferred stock            
Class of Stock [Line Items]            
Stock issued during period, new issues (in shares)     250,000      
Preferred stock, dividend rate (as a percent)     4.00%      
Preferred stock, par value per share (in dollars per share) | $ / shares     $ 0.001      
Shares issued, price per share (in dollars per share) | $ / shares     $ 1,000      
Proceeds from issuance of stock | $     $ 250,000,000.0      
Net proceeds from private placement | $     $ 28,200,000      
Private Placement | Common Stock [Member]            
Class of Stock [Line Items]            
Stock issued during period, new issues (in shares)     675,536      
Net proceeds from private placement | $     $ 237,200,000      
Underwritten public offering            
Class of Stock [Line Items]            
Stock Issued During Period, Shares, Issued for Services   568,181        
Stock issued during period, new issues (in shares)   4,356,059        
Shares issued, price per share (in dollars per share) | $ / shares   $ 66.00        
Proceeds from issuance of common stock, net of issuance costs | $   $ 269,800,000