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Debt - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Jul. 23, 2018
Debt Instrument [Line Items]          
Inventory $ 70,649,000   $ 74,590,000    
Cash, cash equivalents, restricted cash and restricted cash equivalents 230,712,000 $ 406,089,000 247,448,000 $ 439,055,000  
1.75% Convertible Senior Notes due 2023          
Debt Instrument [Line Items]          
Stated interest rate         1.75%
Amortization of debt issuance costs 186,000 178,000      
Interest expense, debt 629,000 $ 629,000      
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 $ 130,801,000   $ 142,672,000    
Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt, weighted average interest rate 3.77%   4.45%    
Net assets $ 53,445,000   $ 16,200,000    
Inventory 44,455,000   7,456,000    
Cash, cash equivalents, restricted cash and restricted cash equivalents 5,648,000   $ 5,663,000    
Amortization of debt issuance costs 154,000        
Interest expense, debt $ 80,000        
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%        
Debt, weighted average interest rate 3.52%   3.79%    
Texas Capital Bank, N.A. | Warehouse Agreement Borrowings          
Debt Instrument [Line Items]          
Stated interest rate 3.50%        
Debt, weighted average interest rate 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%        
Debt, weighted average interest rate 3.36%   3.69%    
Debt instrument, termination notice period     30 days    
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%