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Outstanding Loans and Security Agreements - Recourse Debt Facilities (Additional Information) (Details)
3 Months Ended 6 Months Ended
Jun. 18, 2020
USD ($)
shares
$ / shares
May 01, 2020
USD ($)
Mar. 31, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Mar. 30, 2020
$ / shares
Dec. 31, 2019
USD ($)
Nov. 30, 2019
$ / shares
Jul. 01, 2017
Debt Instrument [Line Items]                        
Unpaid Principal Balance       $ 640,626,000     $ 640,626,000     $ 658,083,000    
Debt make-whole expense               $ 5,934,000        
Long-term debt carrying value       645,719,000     645,719,000     636,812,000    
Loss on extinguishment of debt       0   $ 0 14,098,000 0        
Payments of debt issuance costs             3,371,000 $ 0        
Current portion of debt       26,064,000     26,064,000     337,583,000    
Long-term portion of debt       $ 619,655,000     $ 619,655,000     299,229,000    
10.25% senior secured notes due March 2027                        
Debt Instrument [Line Items]                        
Interest rate percentage   10.25%                    
Redemption price, percentage             101.00%          
Convertible promissory notes | Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Unpaid Principal Balance                   $ 33,104,000    
Interest rate percentage     10.00% 5.00% 10.00%   5.00%   5.00% 5.00%    
Convertible stock price (in dollars per share) | $ / shares     $ 8.00   $ 8.00       $ 38.64      
Debt make-whole expense         $ 3,800,000              
Long-term debt carrying value                   $ 36,482,000    
Current portion of debt                   36,482,000    
Long-term portion of debt                   0    
Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Unpaid Principal Balance                   $ 289,299,000    
Interest rate percentage                   6.00%    
Convertible stock price (in dollars per share) | $ / shares                     $ 11.25  
Long-term debt carrying value                   $ 273,410,000    
Current portion of debt                   273,410,000    
Long-term portion of debt                   0    
Convertible promissory notes | 10% convertible promissory notes due December 20211                        
Debt Instrument [Line Items]                        
Unpaid Principal Balance       $ 249,299,000     $ 249,299,000          
Interest rate percentage       10.00%     10.00%          
Long-term debt carrying value       $ 263,405,000     $ 263,405,000          
Current portion of debt       0     0          
Long-term portion of debt       263,405,000     263,405,000          
Convertible promissory notes | Convertible Promissory Notes Interest Rate 10% Due December 2021                        
Debt Instrument [Line Items]                        
Convertible stock price (in dollars per share) | $ / shares     $ 8.00   $ 8.00              
Debt face amount     $ 290,000,000.0   $ 290,000,000.0              
Repayments of convertible debt   $ 70,000,000.0                    
Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse, Amendment                        
Debt Instrument [Line Items]                        
Interest rate percentage     10.00%   10.00%       6.00%      
Convertible stock price (in dollars per share) | $ / shares $ 8.00   $ 8.00   $ 8.00       $ 11.25      
Convertible, number of equity instruments (in shares) | shares 4,700,000                      
Debt instrument, unamortized premium $ 3,400,000                      
Notes | 10% notes due July 2024                        
Debt Instrument [Line Items]                        
Unpaid Principal Balance       $ 86,000,000     $ 86,000,000     $ 93,000,000    
Interest rate percentage       10.00%     10.00%     10.00%    
Long-term debt carrying value       $ 83,497,000     $ 83,497,000     $ 89,962,000    
Accrued and unpaid interest       3,600,000     3,600,000     3,900,000    
Current portion of debt       14,000,000     14,000,000     14,000,000.0    
Long-term portion of debt       69,497,000     69,497,000     75,962,000    
Notes | 10.25% senior secured notes due March 2027                        
Debt Instrument [Line Items]                        
Unpaid Principal Balance       $ 70,000,000     $ 70,000,000          
Interest rate percentage       10.25%     10.25%          
Long-term debt carrying value       $ 68,437,000     $ 68,437,000          
Debt face amount   70,000,000.0                    
Current portion of debt       0     0          
Long-term portion of debt   70,000,000.0   68,437,000     68,437,000          
Convertible debt | Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Extinguishment of debt amount     $ 33,100,000                  
Debt make-whole expense     3,800,000                  
Long-term debt, fair value     $ 40,700,000   $ 40,700,000              
Convertible debt | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Long-term debt, fair value       340,700,000     340,700,000          
Debt instrument, unamortized premium   4,300,000                    
Long-term debt carrying value       279,000,000.0     279,000,000.0          
Debt face amount       289,300,000     289,300,000          
Loss on extinguishment of debt             10,300,000          
Accrued and unpaid interest       1,400,000     1,400,000          
Debt issuance costs, net       1,000,000.0     1,000,000.0          
Payments of debt issuance costs             $ 1,200,000          
Interest discount, basis spread on variable rate             0.0050          
Repayments of convertible debt   70,000,000.0                    
Debt instrument, unamortized discount       10,700,000     $ 10,700,000          
Convertible debt | Additional Convertible Notes                        
Debt Instrument [Line Items]                        
Interest rate percentage     10.00%   10.00%              
Debt face amount     $ 30,000,000.0   $ 30,000,000.0              
Convertible debt | Convertible Promissory Notes Interest Rate 10% Due December 2021                        
Debt Instrument [Line Items]                        
Debt instrument, unamortized premium       14,100,000     14,100,000          
Long-term debt carrying value       263,400,000     263,400,000          
Debt face amount       249,300,000     249,300,000          
Repayments of convertible debt   70,000,000.0                    
Maximum borrowing capacity   150,000,000.0                    
Current borrowing capacity   $ 80,000,000.0                    
Term loan | Term Loan due December 2021, Non-Recourse                        
Debt Instrument [Line Items]                        
Unpaid Principal Balance       $ 119,472,000     $ 119,472,000     $ 121,784,000    
Interest rate percentage       2.50%     2.50%     2.50%    
Long-term debt carrying value       $ 118,473,000     $ 118,473,000     $ 120,437,000    
Current portion of debt       5,289,000     5,289,000     5,122,000    
Long-term portion of debt       $ 113,184,000     $ 113,184,000     $ 115,315,000    
Term loan | Term Loan due November 2020, Recourse                        
Debt Instrument [Line Items]                        
Weighted average interest rate (as a percentage)       4.50%     4.50%     6.30%    
Unpaid Principal Balance       $ 714,000     $ 714,000     $ 1,571,000    
Interest rate percentage       4.00%     4.00%     4.00%    
Long-term debt carrying value       $ 697,000     $ 697,000     $ 1,536,000    
Current portion of debt       697,000     697,000     1,536,000    
Long-term portion of debt       0     $ 0     0    
Term loan | Term Loan due November 2020, Recourse | LIBOR                        
Debt Instrument [Line Items]                        
LIBOR margin (as a percentage)             4.00%          
New Enterprise Associates 10, Limited Partnership [Member] | Convertible debt | Additional Convertible Notes                        
Debt Instrument [Line Items]                        
Total amount of loan proceeds             $ 20,000,000.0          
Foris Ventures LLC | Convertible debt | Additional Convertible Notes                        
Debt Instrument [Line Items]                        
Total amount of loan proceeds             10,000,000.0          
Affiliated entity                        
Debt Instrument [Line Items]                        
Unpaid Principal Balance       50,801,000     50,801,000     59,138,000    
Long-term debt carrying value       53,675,000     53,675,000     55,771,000    
Current portion of debt       0     0     24,683,000    
Long-term portion of debt       53,675,000     53,675,000     $ 31,088,000    
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Convertible stock price (in dollars per share) | $ / shares     $ 38.64   $ 38.64              
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Interest rate percentage                       6.00%
Embedded derivative, fair value, net       $ 24,000,000.0     $ 24,000,000.0          
Affiliated entity | Convertible promissory notes | 10% convertible promissory notes due December 20211                        
Debt Instrument [Line Items]                        
Convertible stock price (in dollars per share) | $ / shares $ 8.00     $ 8.00     $ 8.00          
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes Interest Rate 10% Due December 2021                        
Debt Instrument [Line Items]                        
Interest rate percentage     10.00% 10.00% 10.00%   10.00%          
Covenant, proceeds used for certain transactions, percentage     50.00%   50.00%              
Redemption price, percentage of principal amount redeemed         100.00%              
On or after March 27, 2022 | 10.25% senior secured notes due March 2027                        
Debt Instrument [Line Items]                        
Redemption price, percentage             108.00%          
On or after March 27, 2022 | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Redemption, applicable percentage       0     0          
On or after March 27, 2022 | Maximum | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Redemption, applicable percentage       1     1          
On or after March 27, 2022 | Minimum | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Redemption, applicable percentage       0     0          
On or after March 27, 2023 | 10.25% senior secured notes due March 2027                        
Debt Instrument [Line Items]                        
Redemption price, percentage             104.00%          
On or after March 27, 2023 | Maximum | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Redemption, applicable percentage       1     1          
On or after March 27, 2023 | Minimum | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse                        
Debt Instrument [Line Items]                        
Redemption, applicable percentage       0.25     0.25          
On or after March 27, 2024 | 10.25% senior secured notes due March 2027                        
Debt Instrument [Line Items]                        
Redemption price, percentage             102.00%          
On or after March 27, 2026 | 10.25% senior secured notes due March 2027                        
Debt Instrument [Line Items]                        
Redemption price, percentage             100.00%