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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents $ 121,848 $ 137,394 $ 162,219
Accumulated gross unrealized gain, before tax 192 154  
Accumulated gross unrealized loss, before tax 0 (341)  
Cash, cash equivalents and debt securities available-for-sale, amortized cost 174,776 206,139  
Cash, cash equivalents and debt securities available-for-sale 174,968 205,952  
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Accumulated gross unrealized gain, before tax 68 116  
Accumulated gross unrealized loss, before tax 0 0  
Cash, cash equivalents and debt securities available-for-sale, amortized cost 133,150 148,366  
Cash, cash equivalents and debt securities available-for-sale 133,218 148,482  
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized cost 41,626 57,773  
Accumulated gross unrealized gain, before tax 124 38  
Accumulated gross unrealized loss, before tax 0 (341)  
Debt securities, available-for-sale 41,750 57,470  
Cash      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents 32,611 31,378  
Cash and cash equivalents, fair value 32,611 31,378  
Money market funds | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents 94,354 110,796  
Cash and cash equivalents, fair value 94,354 110,796  
Treasury securities | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized cost 6,185 6,192  
Accumulated gross unrealized gain, before tax 68 116  
Accumulated gross unrealized loss, before tax 0 0  
Debt securities, available-for-sale 6,253 6,308  
Certificate of deposit | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents 8,641 8,641  
Cash and cash equivalents, fair value 8,641 8,641  
Commercial paper | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized cost 4,399 14,979  
Accumulated gross unrealized gain, before tax 0 6  
Accumulated gross unrealized loss, before tax 0 0  
Debt securities, available-for-sale 4,399 14,985  
Corporate debt | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized cost 28,586 34,153  
Accumulated gross unrealized gain, before tax 124 32  
Accumulated gross unrealized loss, before tax 0 (341)  
Debt securities, available-for-sale 28,710 33,844  
Cash and Cash Equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, cash equivalents and debt securities available-for-sale 121,848 137,394  
Cash and Cash Equivalents | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, cash equivalents and debt securities available-for-sale 120,048 131,798  
Cash and Cash Equivalents | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale 1,800 5,596  
Cash and Cash Equivalents | Cash      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents 25,694 21,002  
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 94,354 110,796  
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 1,800 5,596  
Restricted Cash (Current & Non-Current)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, cash equivalents and debt securities available-for-sale 15,558 19,017  
Restricted Cash (Current & Non-Current) | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, cash equivalents and debt securities available-for-sale 6,917 10,376  
Restricted Cash (Current & Non-Current) | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale 8,641 8,641  
Restricted Cash (Current & Non-Current) | Cash      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents 6,917 10,376  
Restricted Cash (Current & Non-Current) | Certificate of deposit | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents 8,641 8,641  
Short-Term Investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, cash equivalents and debt securities available-for-sale 31,381 33,458  
Short-Term Investments | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale 6,253    
Short-Term Investments | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale 25,128 33,458  
Short-Term Investments | Treasury securities | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale 6,253    
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 2,599 9,389  
Short-Term Investments | Corporate debt | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale 22,529 24,069  
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 6,181 16,083  
Long-Term Investments | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale 0 6,308  
Long-Term Investments | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale 6,181 9,775  
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 0 6,308  
Long-Term Investments | Certificate of deposit | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale 0 0  
Long-Term Investments | Corporate debt | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt securities, available-for-sale $ 6,181 $ 9,775