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Income Taxes - Net Operating Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]    
Net operating losses with expiration $ 75,500  
Valuation allowance 178,307 $ 144,540
Change in the valuation allowance 33,800  
Unrecognized tax benefits 0 0
Federal    
Operating Loss Carryforwards [Line Items]    
Net operating losses 261,900 185,400
Net operating losses carryforward indefinitely 186,400  
State    
Operating Loss Carryforwards [Line Items]    
Net operating losses $ 258,400 $ 183,300