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Certain Financial Statement Information - Short-Term Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2015
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Gross Unrealized Gains $ 405 $ 288    
Available-for-sale Securities, Gross Unrealized Losses (17) (35)    
Cash Cash equivalents Short term investment-Amortized cost basis 81,340 83,592    
Cash and cash equivalents 22,489 25,065 [1] $ 21,075 $ 36,495
Short-term investments available-for-sale 59,239 58,780 [1]    
Cash, Cash equivalents and Short-term investments, Estimated Fair Value 81,728 83,845    
Cash        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Cash and Cash equivalents, Estimated Fair Value 21,449 23,510    
Money Market Funds [Member]        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Cash and Cash equivalents, Estimated Fair Value 1,040 1,555    
U.S. Treasury and agency securities        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 16,218 14,863    
Available-for-sale Securities, Gross Unrealized Gains 39 38    
Available-for-sale Securities, Gross Unrealized Losses (2) (3)    
Available-for-sale Securities, Estimated Fair Value 16,255 14,898    
Corporate bonds        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 25,254 28,047    
Available-for-sale Securities, Gross Unrealized Gains 287 221    
Available-for-sale Securities, Gross Unrealized Losses (2) (5)    
Available-for-sale Securities, Estimated Fair Value 25,539 28,263    
Asset-backed and mortgage-backed securities        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 16,573 13,565    
Available-for-sale Securities, Gross Unrealized Gains 74 13    
Available-for-sale Securities, Gross Unrealized Losses (13) (27)    
Available-for-sale Securities, Estimated Fair Value 16,634 13,551    
Municipal bonds        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 806 2,052    
Available-for-sale Securities, Gross Unrealized Gains 5 16    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Estimated Fair Value $ 811 $ 2,068    
[1] The Condensed Consolidated Balance Sheet as of March 31, 2016 has been derived from the audited Consolidated Financial Statements at that date but does not include all disclosures required by generally accepted accounting principles for complete financial statements.