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Certain Financial Statement Information - Short-Term Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
[2]
Mar. 31, 2014
[2]
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost $ 76,601 $ 73,403    
Available-for-sale Securities, Gross Unrealized Gains 19 2,020    
Available-for-sale Securities, Gross Unrealized Losses (177) (65)    
Available-for-sale Securities, Estimated Fair Value 76,443 75,358    
Cash and cash equivalents 18,770 36,495 [1] $ 50,080 $ 71,539
Short-term investments available-for-sale 57,673 38,863 [1]    
Cash, Cash equivalents and Short-term investments, Estimated Fair Value 76,443 75,358    
Cash        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Cash and Cash equivalents, Estimated Fair Value 16,299 33,936    
Cash equivalents        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Cash and Cash equivalents, Estimated Fair Value 2,471 2,559    
U.S Treasury securities and agency bonds        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 17,855 1,230    
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses (54) 0    
Available-for-sale Securities, Estimated Fair Value 17,801 1,230    
Corporate bonds        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 25,957 10,772    
Available-for-sale Securities, Gross Unrealized Gains 18 28    
Available-for-sale Securities, Gross Unrealized Losses (63) (6)    
Available-for-sale Securities, Estimated Fair Value 25,912 10,794    
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 11,948 0    
Available-for-sale Securities, Gross Unrealized Gains 1 15    
Available-for-sale Securities, Gross Unrealized Losses (50) 0    
Available-for-sale Securities, Estimated Fair Value 11,899 15    
Municipal bonds        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 2,071 0    
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses (10) 0    
Available-for-sale Securities, Estimated Fair Value 2,061 0    
Mutual Funds        
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 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 cash, cash equivalents and available-for-sale investments by type of instruments        
Available-for-sale Securities, Amortized Cost 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] The Condensed Consolidated Balance Sheet as of March 31, 2015 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.
[2] The Statement of Cash Flows for the nine months ended December 31, 2014 reflects immaterial revisions to correct $0.3 million of outstanding payables related to purchases of property and equipment previously included in net cash used for investing activities to net cash used for operating activities and $0.1 million of net realized gains on short-term investments previously classified as net cash used for operating activities to net cash provided by investing activities. As a result, net cash used for operating activities increased by $0.4 million and net cash used for investing activities decreased by the corresponding amount.