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Debt - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Jul. 23, 2018
Debt Instrument [Line Items]              
Inventory $ 9,437,000   $ 9,437,000   $ 74,590,000    
Cash, cash equivalents, restricted cash and restricted cash equivalents 360,454,000 $ 259,237,000 360,454,000 $ 259,237,000 247,448,000 $ 439,055,000  
1.75% Convertible Senior Notes due 2023              
Debt Instrument [Line Items]              
Stated interest rate             1.75%
Amortization of debt issuance costs 187,000 180,000 373,000 359,000      
Interest expense, debt 629,000 $ 629,000 1,258,000 $ 1,258,000      
Aggregated principal amount             $ 143,750,000
Debt instrument, interest rate, effective percentage             7.25%
Fair Value, Inputs, Level 2 | 1.75% Convertible Senior Notes due 2023              
Debt Instrument [Line Items]              
Debt instrument, fair value $ 213,397,000   $ 213,397,000   $ 142,672,000    
Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt, weighted average interest rate 4.33%   4.33%   4.45%    
Net assets $ 30,047,000   $ 30,047,000   $ 16,200,000    
Inventory 6,331,000   6,331,000   7,456,000    
Cash, cash equivalents, restricted cash and restricted cash equivalents 17,559,000   17,559,000   $ 5,663,000    
Amortization of debt issuance costs 155,000   309,000        
Interest expense, debt $ 251,000   $ 331,000        
Western Alliance Bank | Warehouse Agreement Borrowings | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     2.00%        
Stated interest rate 3.50%   3.50%        
Debt, weighted average interest rate 3.52%   3.52%   3.79%    
Texas Capital Bank, N.A. | Warehouse Agreement Borrowings              
Debt Instrument [Line Items]              
Stated interest rate 3.50%   3.50%        
Debt, weighted average interest rate 3.50%   3.50%   3.51%    
Decrease in rate of interest accruing on outstanding principal     0.50%        
Goldman Sachs Bank USA | Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt instrument, term     6 months        
Minimum | Goldman Sachs Bank USA | Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt instrument, floor rate of basis spread on variable rate     0.50%        
Maximum | Goldman Sachs Bank USA | Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     2.65%        
Line of Credit | Revolving Credit Facility | Flagstar Warehouse Credit Facility              
Debt Instrument [Line Items]              
Stated interest rate 3.00%   3.00%        
Debt, weighted average interest rate 3.00%   3.00%   3.69%    
Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Flagstar Warehouse Credit Facility              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     2.00%