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Fair Value Measurements (Details) - USD ($)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value Measurements    
Amortized Cost $ 22,135,000 $ 5,274,000
Gross Unrealized Loss (24,000) (1,000)
Gross Unrealized Gain 20,000  
Estimated Fair Value 22,131,000 5,273,000
Other-than-temporary impairment of investments 0  
Level 1    
Fair Value Measurements    
Amortized Cost 10,576,000 3,338,000
Gross Unrealized Loss (1,000)  
Estimated Fair Value 10,575,000 3,338,000
Level 1 | Money market funds    
Fair Value Measurements    
Amortized Cost 10,576,000 3,338,000
Gross Unrealized Loss (1,000)  
Estimated Fair Value 10,575,000 3,338,000
Level 2    
Fair Value Measurements    
Amortized Cost 11,559,000 1,936,000
Gross Unrealized Loss (23,000) (1,000)
Gross Unrealized Gain 20,000  
Estimated Fair Value 11,556,000 1,935,000
Level 2 | Commercial paper    
Fair Value Measurements    
Amortized Cost 1,495,000  
Gross Unrealized Loss (1,000)  
Estimated Fair Value 1,494,000  
Level 2 | Corporate notes and bonds    
Fair Value Measurements    
Amortized Cost 6,044,000 1,434,000
Gross Unrealized Loss (22,000) (1,000)
Estimated Fair Value 6,022,000 1,433,000
Level 2 | US Treasuries    
Fair Value Measurements    
Amortized Cost 3,013,000 502,000
Gross Unrealized Gain 20,000  
Estimated Fair Value 3,033,000 $ 502,000
Level 2 | US Government agencies    
Fair Value Measurements    
Amortized Cost 1,007,000  
Estimated Fair Value $ 1,007,000