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Subsequent Events (Details)
$ in Thousands, shares in Millions
1 Months Ended 2 Months Ended
Nov. 27, 2019
USD ($)
Feb. 25, 2019
USD ($)
shares
May 31, 2020
USD ($)
shares
Apr. 30, 2020
USD ($)
Jun. 09, 2020
USD ($)
shares
May 31, 2020
€ / shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Subsequent Event [Line Items]                
Number of shares acquired during period (in shares) | shares   5.9            
Long-term investment   $ 5,900         $ 5,871 $ 5,871
Subsequent Event                
Subsequent Event [Line Items]                
Number of shares acquired during period (in shares) | shares     2.2          
Long-term investment     $ 2,200          
Loan and Security Agreement with Hercules Capital, Inc. | Term Loan                
Subsequent Event [Line Items]                
Repayments of debt $ 15,700              
Loan and Security Agreement with Hercules Capital, Inc. | Term Loan | Subsequent Event                
Subsequent Event [Line Items]                
Repayments of debt       $ 15,700        
Accrued interest, fees and other amounts       300        
Private Placement | SVB Leerink LLC | Subsequent Event                
Subsequent Event [Line Items]                
Maximum offering under equity offering program       $ 25,000        
Percentage of gross proceeds from common stock issuance paid for services       3.00%        
Common stock issued during period (in shares) | shares         0.9      
Net proceeds from common stock issued         $ 2,700      
Long-term Investee | Subsequent Event                
Subsequent Event [Line Items]                
Par value (in EUR per share) | € / shares           € 0.00001