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Stockholders' Equity - Additional Information (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
$ / shares
shares
Feb. 05, 2021
USD ($)
$ / shares
shares
Jan. 25, 2021
USD ($)
$ / shares
shares
Oct. 01, 2020
USD ($)
item
$ / shares
shares
Jun. 30, 2021
USD ($)
director
$ / shares
shares
Jun. 30, 2020
USD ($)
director
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Class of Stock [Line Items]              
Common stock, shares authorized | shares 100,000,000       100,000,000   100,000,000
Stock Issued During Period, Value, Issued for Services         $ 11,500 $ 41,300  
Preferred stock, par value per share (in dollars per share) | $ / shares $ 0.001       $ 0.001   $ 0.001
Preferred stock, shares authorized | shares 2,500,000       2,500,000   2,500,000
Common stock, par value per share (in dollars per share) | $ / shares $ 0.001     $ 0.001 $ 0.001   $ 0.001
Dividends, paid-in-kind         $ 4,200,000   $ 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 $ 0  
Common stock, shares issued | shares 45,892,448       45,892,448   39,837,058
Common stock issued upon conversion of senior notes | shares         4,810,002    
Warrants [Member]              
Class of Stock [Line Items]              
Common stock issued upon conversion of senior notes | shares 18,100,000            
Director [Member]              
Class of Stock [Line Items]              
Stock Issued During Period, Shares, Issued for Services | shares         229 1,968  
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   $ 0.001
Preferred stock, shares authorized | shares 800,000       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   $ 0.001
Preferred stock, shares authorized | shares 585,000       585,000   585,000
Class C convertible preferred stock              
Class of Stock [Line Items]              
Stock issued during period, new issues (in shares) | 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   $ 0.001
Preferred stock, shares authorized | shares 250,000       250,000   250,000
Dividends, paid-in-kind             $ 300,000
Liquidation preference (in dollars per share) | $ / shares   $ 1,000   $ 1,000      
Conversion price (in dollars per share) | $ / shares       $ 38.6152      
Conversion rate       25.90      
Shares to be issued upon conversion | shares       6,474,135      
Threshold trading days for conversion of preferred stock       20      
Threshold consecutive trading days for conversion of preferred stock       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 | shares   50,000   50,000      
Redemption price (as a percent)       125.00%      
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]              
Common stock, par value per share (in dollars per share) | $ / shares   $ 0.001          
Conversion price (in dollars per share) | $ / shares   $ 38.6152          
Shares to be issued upon conversion | shares   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) | 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) | 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 | shares     568,181        
Stock issued during period, new issues (in shares) | 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