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FAIR VALUE MEASUREMENTS (Tables)
6 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Measurements
Cash, cash equivalents, restricted cash, and available-for-sale investments were as follows (in thousands):
As of September 30, 2020Amortized CostsGross
Unrealized Gain
Gross
Unrealized Loss
Estimated Fair ValueCash and
Cash Equivalents
Restricted Cash (Current & Non-Current)Short-Term InvestmentsLong-Term Investments
Cash$32,611 $— $— $32,611 $25,694 $6,917 $— $— 
Level 1:
Money market funds94,354 — — 94,354 94,354 — — — 
Treasury securities6,185 68 — 6,253 — — 6,253 — 
     Subtotal133,150 68 — 133,218 120,048 6,917 6,253 — 
Level 2:
Certificate of deposit8,641 — — 8,641 — 8,641 — — 
Commercial paper4,399 — — 4,399 1,800 — 2,599 
Corporate debt28,586 124 — 28,710 — — 22,529 6,181 
     Subtotal41,626 124 — 41,750 1,800 8,641 25,128 6,181 
     Total assets$174,776 $192 $— $174,968 $121,848 $15,558 $31,381 $6,181 
As of March 31, 2020Amortized CostsGross
Unrealized Gain
Gross
Unrealized Loss
Estimated Fair ValueCash and
Cash Equivalents
Restricted Cash (Current & Non-Current)Short-Term InvestmentsLong-Term Investments
Cash$31,378 $— $— $31,378 $21,002 $10,376 $— $— 
Level 1:
Money market funds110,796 — — 110,796 110,796 — — — 
Treasury securities6,192 116 — 6,308 — — — 6,308 
     Subtotal148,366 116 — 148,482 131,798 10,376 — 6,308 
Level 2:
Certificate of deposit8,641 — — 8,641 — 8,641 — — 
Commercial paper14,979 — 14,985 5,596 — 9,389 — 
Corporate debt34,153 32 (341)33,844 — — 24,069 9,775 
     Subtotal57,773 38 (341)57,470 5,596 8,641 33,458 9,775 
     Total assets$206,139 $154 $(341)$205,952 $137,394 $19,017 $33,458 $16,083