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Fair Value Measurement of Assets and Liabilities (Details) - USD ($)
3 Months Ended
Jun. 30, 2020
May 12, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of embedded derivative $ 3,800,000 $ 4,600,000  
Gain on change in fair value of embedded derivative 800,000    
Convertible Debt | 2022 Notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Carrying amount of debt 2,000 45,000,000.0 $ 105,125,000
Net carrying amount 2,000   101,334,000
Convertible Debt | 2025 Notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of embedded derivative 3,756,000    
Carrying amount of debt 180,375,000 $ 180,400,000  
Net carrying amount 176,171,000    
Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of cash equivalents 126,000   126,000
Fair value of embedded derivative 3,756,000    
Recurring | Interest make-whole provision      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of embedded derivative 3,756,000    
Recurring | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of cash equivalents 126,000   126,000
Recurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of cash equivalents 126,000   126,000
Recurring | Level 1 | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of cash equivalents 126,000   $ 126,000
Recurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of embedded derivative 3,756,000    
Recurring | Level 3 | Interest make-whole provision      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of embedded derivative $ 3,756,000