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Cash and Short-Term Investments - Summary of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents $ 25,065 $ 36,495 $ 71,539 $ 19,065
Cash, Cash equivalents and Available-for-sale Investments, Amortized Cost 83,592 73,403    
Available-for-sale securities, Gross Unrealized Gains 288 2,020    
Available-for-sale securities, Gross Unrealized Losses (35) (65)    
Cash, Cash equivalents and Available-for-sale Investments, Estimated Fair Value 83,845 75,358    
Short-term investments available-for-sale 58,780 38,863    
Cash        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents [1] 23,510 33,936    
Cash and cash equivalents, Estimated Fair Value [1] 23,510 33,936    
Cash equivalents        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents 1,555 2,559    
Cash and cash equivalents, Estimated Fair Value 1,555 2,559    
U.S. Treasury and agency securities        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 14,863 1,230    
Available-for-sale securities, Gross Unrealized Gains 38 0    
Available-for-sale securities, Gross Unrealized Losses (3) 0    
Available-for-sale Securities, Estimated Fair Value 14,898 1,230    
Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 28,047 10,772    
Available-for-sale securities, Gross Unrealized Gains 221 28    
Available-for-sale securities, Gross Unrealized Losses (5) (6)    
Available-for-sale Securities, Estimated Fair Value 28,263 10,794    
Asset-backed and mortgage-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 13,565 0    
Available-for-sale securities, Gross Unrealized Gains 13 15    
Available-for-sale securities, Gross Unrealized Losses (27) 0    
Available-for-sale Securities, Estimated Fair Value 13,551 15    
Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 2,052 0    
Available-for-sale securities, Gross Unrealized Gains 16 0    
Available-for-sale securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Estimated Fair Value 2,068 0    
Mutual funds        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 0 24,895    
Available-for-sale securities, Gross Unrealized Gains 0 1,955    
Available-for-sale securities, Gross Unrealized Losses 0 (59)    
Available-for-sale Securities, Estimated Fair Value 0 26,791    
Preferred Stock        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 0 11    
Available-for-sale securities, Gross Unrealized Gains 0 22    
Available-for-sale securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Estimated Fair Value $ 0 $ 33    
[1] Includes $1.2 million and $1.1 million restricted cash related to its voluntary disability insurance as of March 31, 2016 and 2015, respectively.