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Cash, Cash Equivalents and Investments with Hierarchy (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018
Amortized Costs	$ 144,801	$ 152,716
Gross Unrealized Gains	13	10
Gross Unrealized Loss	(354)	(464)
Estimated Fair Value	144,460	152,262
Cash and cash equivalents	34,557	31,703
Short-term marketable investments	109,903	120,559
Aavailable-for-sale investments due within one year	54,153
Aavailable-for-sale investments due after one year	55,750
Level 1
Amortized Costs	34,557	31,073
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Estimated Fair Value	34,557	31,073
Cash and cash equivalents	34,557	31,073
Short-term marketable investments		0
Level 2
Amortized Costs	110,244	121,013
Gross Unrealized Gains	13	10
Gross Unrealized Loss	(354)	(464)
Estimated Fair Value	109,903	120,559
Cash and cash equivalents	0	0
Short-term marketable investments	109,903	120,559
Cash
Amortized Costs	13,051	16,499
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Estimated Fair Value	13,051	16,499
Cash and cash equivalents	13,051	16,499
Short-term marketable investments	0	0
Money Market Funds | Level 1
Amortized Costs	21,506	15,204
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Estimated Fair Value	21,506	15,204
Cash and cash equivalents	21,506	15,204
Short-term marketable investments	0	0
Commercial Paper | Level 2
Amortized Costs	3,199	13,254
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	(8)
Estimated Fair Value	3,199	13,246
Cash and cash equivalents	0	0
Short-term marketable investments	3,199	13,246
Corporate Debt | Level 2
Amortized Costs	72,400	70,631
Gross Unrealized Gains	12	6
Gross Unrealized Loss	(221)	(296)
Estimated Fair Value	72,191	70,341
Cash and cash equivalents	0	0
Short-term marketable investments	72,191	70,341
Municipal Securities | Level 2
Amortized Costs	3,392	3,385
Gross Unrealized Gains	1	3
Gross Unrealized Loss	0	(1)
Estimated Fair Value	3,393	3,387
Cash and cash equivalents	0	0
Short-term marketable investments	3,393	3,387
Asset-backed Securities | Level 2
Amortized Costs	24,552	27,063
Gross Unrealized Gains	0	1
Gross Unrealized Loss	(92)	(119)
Estimated Fair Value	24,460	26,945
Cash and cash equivalents	0	0
Short-term marketable investments	24,460	26,945
Agency Bond | Level 2
Amortized Costs	4,202	4,183
Gross Unrealized Gains	0	0
Gross Unrealized Loss	(39)	(35)
Estimated Fair Value	4,163	4,148
Cash and cash equivalents	0	0
Short-term marketable investments	4,163	4,148
International Government Securities | Level 2
Amortized Costs	2,499	2,497
Gross Unrealized Gains	0	0
Gross Unrealized Loss	(2)	(5)
Estimated Fair Value	2,497	2,492
Cash and cash equivalents	0	0
Short-term marketable investments	$ 2,497	$ 2,492

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