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FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 184,794 $ 276,583
Accumulated gross unrealized gain, before tax 122 77
Accumulated gross unrealized loss, before tax 0 (61)
Cash, cash equivalents and debt securities available-for-sale, amortized cost 235,081 346,466
Cash, cash equivalents and debt securities available-for-sale 235,203 346,482
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 13  
Accumulated gross unrealized loss, before tax 0  
Cash, cash equivalents and debt securities available-for-sale, amortized cost 186,621  
Cash, cash equivalents and debt securities available-for-sale 186,634  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 48,460 69,883
Accumulated gross unrealized gain, before tax 109 77
Accumulated gross unrealized loss, before tax 0 (61)
Debt securities, available-for-sale 48,569 69,899
Treasury securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 6,498  
Accumulated gross unrealized gain, before tax 13  
Accumulated gross unrealized loss, before tax 0  
Debt securities, available-for-sale 6,511  
Corporate bonds | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 36,181 46,516
Accumulated gross unrealized gain, before tax 93 51
Accumulated gross unrealized loss, before tax 0 (29)
Debt securities, available-for-sale 36,274 46,538
Commercial paper | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 8,835  
Accumulated gross unrealized gain, before tax 1  
Accumulated gross unrealized loss, before tax 0  
Debt securities, available-for-sale 8,836  
Municipal securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost 1,345 5,511
Accumulated gross unrealized gain, before tax 0 17
Accumulated gross unrealized loss, before tax 0 0
Debt securities, available-for-sale 1,345 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 2,099 4,260
Accumulated gross unrealized gain, before tax 15 0
Accumulated gross unrealized loss, before tax 0 (15)
Debt securities, available-for-sale 2,114 4,245
Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 22,722 25,364
Cash and cash equivalents, fair value 22,722 25,364
Money market funds | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 157,401 251,219
Cash and cash equivalents, fair value 157,401 251,219
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 184,794  
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 180,123  
Cash and Cash Equivalents | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 4,671  
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 4,671  
Cash and Cash Equivalents | Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 22,722 25,364
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 157,401 251,219
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 30,283  
Short-term Investments | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 30,283 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 22,659 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 4,165  
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 1,345 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 2,114 $ 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 20,126  
Long-term Investments | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 6,511  
Long-term Investments | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 13,615  
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 6,511  
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 13,615  
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