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FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 162,219 $ 276,583
Accumulated gross unrealized gain, before tax 149 77
Accumulated gross unrealized loss, before tax (8) (61)
Cash, cash equivalents and debt securities available-for-sale, amortized cost 211,850 346,466
Cash, cash equivalents and debt securities available-for-sale 211,991 346,482
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents   276,583
Cash and cash equivalents, fair value   276,583
Accumulated gross unrealized gain, before tax 7  
Accumulated gross unrealized loss, before tax (5)  
Cash, cash equivalents and debt securities available-for-sale, amortized cost 164,802  
Cash, cash equivalents and debt securities available-for-sale 164,804  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 47,048 69,883
Accumulated gross unrealized gain, before tax 142 77
Accumulated gross unrealized loss, before tax (3) (61)
Debt securities, available-for-sale 47,187 69,899
Treasury securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 6,578  
Accumulated gross unrealized gain, before tax 7  
Accumulated gross unrealized loss, before tax (5)  
Debt securities, available-for-sale 6,580  
Corporate bonds | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 37,858 46,516
Accumulated gross unrealized gain, before tax 123 51
Accumulated gross unrealized loss, before tax (3) (29)
Debt securities, available-for-sale 37,978 46,538
Commercial paper | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 5,592  
Accumulated gross unrealized gain, before tax 0  
Accumulated gross unrealized loss, before tax 0  
Debt securities, available-for-sale 5,592  
Municipal securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 2,099 5,511
Accumulated gross unrealized gain, before tax 19 17
Accumulated gross unrealized loss, before tax 0 0
Debt securities, available-for-sale 2,118 5,528
Asset backed securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost   13,596
Accumulated gross unrealized gain, before tax   9
Accumulated gross unrealized loss, before tax   (17)
Debt securities, available-for-sale   13,588
Agency bonds | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 1,499 4,260
Accumulated gross unrealized gain, before tax 0 0
Accumulated gross unrealized loss, before tax 0 (15)
Debt securities, available-for-sale 1,499 4,245
Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 25,673 25,364
Cash and cash equivalents, fair value 25,673 25,364
Money market funds | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 132,551 251,219
Cash and cash equivalents, fair value 132,551 251,219
Cash and Cash Equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents   276,583
Cash, cash equivalents and debt securities available-for-sale 162,219  
Cash and Cash Equivalents | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents   276,583
Cash, cash equivalents and debt securities available-for-sale 158,224  
Cash and Cash Equivalents | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 3,995  
Cash and Cash Equivalents | Commercial paper | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 3,995  
Cash and Cash Equivalents | Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents   25,364
Cash and cash equivalents, fair value 25,673  
Cash and Cash Equivalents | Money market funds | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents   251,219
Cash and cash equivalents, fair value 132,551  
Short-term Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale   69,899
Cash, cash equivalents and debt securities available-for-sale 29,324  
Short-term Investments | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 29,324 69,899
Short-term Investments | Corporate bonds | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 24,110 46,538
Short-term Investments | Commercial paper | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 1,597  
Short-term Investments | Municipal securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 2,118 5,528
Short-term Investments | Asset backed securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale   13,588
Short-term Investments | Agency bonds | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 1,499 $ 4,245
Long-term Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash, cash equivalents and debt securities available-for-sale 20,448  
Long-term Investments | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 6,580  
Long-term Investments | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 13,868  
Long-term Investments | Treasury securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 6,580  
Long-term Investments | Corporate bonds | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 13,868  
Long-term Investments | Commercial paper | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 0  
Long-term Investments | Municipal securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 0  
Long-term Investments | Agency bonds | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale $ 0