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Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 21, 2018
Dec. 13, 2018
Apr. 27, 2018
Apr. 30, 2019
Jan. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 22, 2014
Dec. 16, 2014
Debt Instrument [Line Items]                          
Non cash interest expense                   $ 4,228,000 $ 0    
Partial extinguishment of equity component                   7,600,000      
Partial extinguishment of Convertible 3.75% Senior Notes             $ 0   $ 2,467,000 185,000 2,467,000    
Proceeds from Revolver                   10,000,000 $ 0    
Term Loan                          
Debt Instrument [Line Items]                          
Debt issuance costs   $ 500,000                      
Line of Credit                          
Debt Instrument [Line Items]                          
Proceeds from Revolver           $ 52,800,000              
Covenant, revenue required to attain   125,000,000.0                      
Line of Credit | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Face amount of the Notes           $ 15,000,000 25,000,000     25,000,000      
Debt issuance costs   300,000                      
Unamortized discount   500,000                      
Proceeds from Revolver   15,000,000.0   $ 5,000,000.0 $ 5,000,000.0                
Line of credit maximum borrowing capacity   $ 25,000,000.0                      
Interest rate at period end           9.30%              
Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                          
Debt Instrument [Line Items]                          
Basis spread on variable rate   3.75%                      
Line of Credit | Revolving Credit Facility | Base Rate                          
Debt Instrument [Line Items]                          
Basis spread on variable rate   2.75%                      
Line of Credit | Term Loan                          
Debt Instrument [Line Items]                          
Interest rate, effective percentage           12.40%              
Unused borrowing capacity, fee percentage   1.00%                      
Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR)                          
Debt Instrument [Line Items]                          
Basis spread on variable rate   8.75%                      
Line of Credit | Term Loan | Base Rate                          
Debt Instrument [Line Items]                          
Basis spread on variable rate   7.75%                      
Qualified Institutional Buyers                          
Debt Instrument [Line Items]                          
Face amount of the Notes                       $ 18,750,000 $ 125,000,000.0
Convertible Note 2019                          
Debt Instrument [Line Items]                          
Non cash interest expense             2,500,000            
Convertible Note 2019 | Convertible Notes Payable                          
Debt Instrument [Line Items]                          
Stated interest rate                       3.75% 3.75%
Debt, transfer     $ 75,100,000                    
Partial extinguishment of Convertible 3.75% Senior Notes     $ 75,100,000                    
Convertible Note 2023 | Convertible Notes Payable                          
Debt Instrument [Line Items]                          
Stated interest rate     4.75%                    
Debt, transfer     $ 75,100,000                    
Initial conversion price (dollars per share)     $ 224.71                    
Settlement conversion price (dollars per share)     $ 280.90                    
Debt issuance costs     $ 1,600,000                    
Unamortized discount     $ 19,000,000.0                    
Interest rate, effective percentage     11.90%                    
Senior Notes, due December 2019                          
Debt Instrument [Line Items]                          
Partial extinguishment of equity component           $ 2,900,000              
Loss on extinguishment of debt           1,700,000   $ 200,000          
Senior Notes, due December 2019 | Convertible Notes Payable                          
Debt Instrument [Line Items]                          
Face amount of the Notes           $ 75,090,000 $ 75,090,000     $ 75,090,000      
Stated interest rate           4.75% 4.75%     4.75%      
Transaction costs           $ 300,000              
Repayments of notes               $ 2,700,000          
2023 Term Loans | Line of Credit | Term Loan                          
Debt Instrument [Line Items]                          
Face amount of the Notes   $ 95,000,000.0                      
Initial Term Loan                          
Debt Instrument [Line Items]                          
Increase to principal balance             $ 2,200,000     $ 4,200,000      
Initial Term Loan | Line of Credit | Term Loan                          
Debt Instrument [Line Items]                          
Face amount of the Notes   50,000,000.0       $ 70,000,000 $ 74,228,000     $ 74,228,000      
Delayed Draw Term Loan A | Term Loan                          
Debt Instrument [Line Items]                          
Debt issuance costs   800,000                      
Unamortized discount   1,800,000                      
Amount drawn $ 20,000,000.0 20,000,000.0                      
Delayed Draw Term Loan A | Line of Credit | Term Loan                          
Debt Instrument [Line Items]                          
Face amount of the Notes   30,000,000.0                      
Delayed Draw Term Loan B | Line of Credit | Term Loan                          
Debt Instrument [Line Items]                          
Face amount of the Notes   $ 15,000,000.0