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Debt - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 09, 2019
USD ($)
Nov. 01, 2018
$ / shares
Jul. 26, 2018
USD ($)
Aug. 31, 2019
USD ($)
$ / shares
Nov. 30, 2017
USD ($)
Aug. 31, 2017
USD ($)
Jan. 31, 2016
USD ($)
Jun. 30, 2014
USD ($)
$ / shares
Jul. 31, 2013
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
shares
Mar. 31, 2017
USD ($)
shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Aug. 01, 2018
USD ($)
Jun. 14, 2018
USD ($)
Debt Instrument [Line Items]                                      
Gain recognized on retirement of debt                   $ (13,205,000) $ (453,000)     $ (13,205,000) $ (453,000)        
Common stock, par value (in dollars per share) | $ / shares                   $ 0.001       $ 0.001     $ 0.001    
Unrealized loss (gain) on fair value adjustment                   $ (463,000) 917,000     $ (2,992,000) (2,514,000)        
Fair value of debt outstanding                   $ 50,540,000       50,540,000     $ 140,974,000    
Amortization of debt discount                           $ 393,000 0        
Debt issuance cost                                     $ 1,300,000
4.25% Convertible Senior Notes (due 2018)                                      
Debt Instrument [Line Items]                                      
Debt instrument, face amount                 $ 100,000,000.0                    
Debt instrument, interest rate                 4.25%                    
Debt instrument, conversion rate (in dollars per share) | $ / shares                 $ 8.74                    
Debt instrument repurchase amount                       $ 12,000,000 $ 39,100,000     $ 6,100,000      
Write-off of debt issuance costs                       100,000       $ 100,000      
Payment for repurchase of convertible notes                         $ 24,100,000            
Debt instrument shares common stock issued upon conversion (in shares) | shares                         2,900,000            
Gain recognized on retirement of debt                       100,000              
Conversion rate                 0.1143674                    
4.25% Convertible Senior Notes (due 2018) | Common Stock                                      
Debt Instrument [Line Items]                                      
Debt instrument repurchase amount                       $ 11,600,000              
Debt instrument shares common stock issued upon conversion (in shares) | shares                       112,400              
3.25% Convertible Senior Notes (due 2020)                                      
Debt Instrument [Line Items]                                      
Debt instrument, face amount     $ 8,000,000                                
Debt instrument, interest rate     3.25%     3.25%       3.25%       3.25%     3.25%    
Debt conversion price, percentage   105.00%                                  
Fair value of debt outstanding                   $ 0       $ 0     $ 27,974,000    
4.875% convertible senior notes due 2020                                      
Debt Instrument [Line Items]                                      
Debt instrument, face amount $ 113,000,000             $ 115,000,000                      
Debt instrument, interest rate               4.875%   4.875%       4.875%          
Debt instrument, conversion rate (in dollars per share) | $ / shares               $ 9.64                      
Debt instrument repurchase amount             $ 2,000,000                        
Write-off of debt issuance costs 700,000           100,000                        
Gain recognized on retirement of debt 2,400,000           $ 100,000                        
Conversion rate               0.1037613                      
Fair value of debt outstanding 111,100,000                 $ 1,905,000       $ 1,905,000     113,000,000    
Debt refinanced, exchanged into similar debt instruments 103,800,000                                    
Amount of accrued interest refinanced 1,000,000                                    
Amount of debt exchanged into a new debt instrument 7,300,000                                    
Convertible senior notes, net of debt issuance costs                   1,900,000       1,900,000          
Convertible senior note payable, fair value                   1,800,000       $ 1,800,000     93,200,000    
Amortization of debt discount                   $ 400,000 0       0        
Debt issuance cost $ 10,100,000                                    
3.25% convertible senior notes due 2023                                      
Debt Instrument [Line Items]                                      
Debt instrument, interest rate                   3.25%       3.25%          
Debt conversion price, percentage       105.00%                              
Interest rate if paid in cash                   3.25%       3.25%          
Interest rate if paid in stock                   5.00%       5.00%          
Paid in kind interest rate                   2.75%       2.75%          
Conversion rate       1.00                              
Threshold percentage of stock price trigger       30.00%                              
Threshold percentage of market price trigger       150.00%                              
Equity method investment, ownership percentage       49.00%                              
Fair value of debt outstanding                   $ 48,635,000       $ 48,635,000     0    
Convertible Senior Notes                                      
Debt Instrument [Line Items]                                      
Amortization of debt discount                   100,000 200,000     500,000 700,000        
Oasis Management and Oasis Investments ll Master Fund Ltd.                                      
Debt Instrument [Line Items]                                      
Common stock, par value (in dollars per share) | $ / shares       $ 0.001                              
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% Convertible Senior Notes (due 2020)                                      
Debt Instrument [Line Items]                                      
Debt instrument, face amount           $ 21,600,000.0                          
Debt instrument, interest rate           3.25%                          
Debt instrument, conversion rate (in dollars per share) | $ / shares   $ 2.54                                  
Gain recognized on retirement of debt       $ 10,400,000 $ (500,000) $ 600,000                          
Debt instrument, amount redeemed                                   $ 13,200,000  
Conversion rate   0.3937008 0.3222688     0.3280302                          
Unrealized loss (gain) on fair value adjustment                   500,000 (900,000)     500,000 (2,500,000)        
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% convertible senior notes due 2023                                      
Debt Instrument [Line Items]                                      
Debt instrument, face amount       $ 8,000,000.0                              
Secured Debt                                      
Debt Instrument [Line Items]                                      
Amortization of debt discount                   200,000 $ 0                
Secured Debt | New Term Loan Agreement                                      
Debt Instrument [Line Items]                                      
Debt instrument, interest rate 10.50%                                    
Interest rate if paid in cash 8.00%                                    
Paid in kind interest rate 2.50%                                    
Fair value of debt outstanding                   $ 134,801,000       134,801,000     $ 0    
Amortization of debt discount                           $ 200,000 $ 0        
Line of credit facility maximum borrowing capacity $ 134,800,000                                    
Covenant, EBITDA requirement 34,000,000                                    
Minimum liquidity requirement 10,000,000                                    
Debt issuance cost $ 3,800,000