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Certain Financial Statement Information - Short-Term Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost $ 81,837 $ 83,592    
Available-for-sale Securities, Gross Unrealized Gains 492 288    
Available-for-sale Securities, Gross Unrealized Losses (18) (35)    
Available-for-sale Securities, Estimated Fair Value 82,311 83,845    
Cash and cash equivalents 24,225 25,065 [1] $ 44,290 $ 36,495
Short-term investments available-for-sale 58,086 58,780 [1]    
Cash, Cash equivalents and Short-term investments, Estimated Fair Value 82,311 83,845    
Cash        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Cash and Cash equivalents, Estimated Fair Value 21,219 23,510    
Cash equivalents        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Cash and Cash equivalents, Estimated Fair Value 3,006 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 14,173 14,863    
Available-for-sale Securities, Gross Unrealized Gains 74 38    
Available-for-sale Securities, Gross Unrealized Losses 0 (3)    
Available-for-sale Securities, Estimated Fair Value 14,247 14,898    
Corporate bonds        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 24,861 28,047    
Available-for-sale Securities, Gross Unrealized Gains 338 221    
Available-for-sale Securities, Gross Unrealized Losses 0 (5)    
Available-for-sale Securities, Estimated Fair Value 25,199 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 16,701 13,565    
Available-for-sale Securities, Gross Unrealized Gains 65 13    
Available-for-sale Securities, Gross Unrealized Losses (18) (27)    
Available-for-sale Securities, Estimated Fair Value 16,748 13,551    
Municipal bonds        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 1,877 2,052    
Available-for-sale Securities, Gross Unrealized Gains 15 16    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Estimated Fair Value $ 1,892 $ 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.