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Cash, Cash Equivalents and Investments with Hierarchy (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Amortized Costs	$ 129,112	$ 152,716
Gross Unrealized Gains	28	10
Gross Unrealized Loss	(231)	(464)
Estimated Fair Value	128,909	152,262
Cash and cash equivalents	24,677	31,703
Short-term marketable investments	104,232	120,559
Aavailable-for-sale investments due within one year	49,792
Aavailable-for-sale investments due after one year	54,440
Level 1
Amortized Costs	24,677	31,073
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Estimated Fair Value	24,677	31,073
Cash and cash equivalents	24,677	31,073
Short-term marketable investments	0	0
Level 2
Amortized Costs	104,435	121,013
Gross Unrealized Gains	28	10
Gross Unrealized Loss	(231)	(464)
Estimated Fair Value	104,232	120,559
Cash and cash equivalents	0	0
Short-term marketable investments	104,232	120,559
Cash
Amortized Costs	16,585	16,499
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Estimated Fair Value	16,585	16,499
Cash and cash equivalents	16,585	16,499
Short-term marketable investments	0	0
Money Market Funds | Level 1
Amortized Costs	8,092	15,204
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Estimated Fair Value	8,092	15,204
Cash and cash equivalents	8,092	15,204
Short-term marketable investments	0	0
Commercial Paper | Level 2
Amortized Costs	3,178	13,254
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	(8)
Estimated Fair Value	3,178	13,246
Cash and cash equivalents	0	0
Short-term marketable investments	3,178	13,246
Corporate Debt | Level 2
Amortized Costs	69,575	70,631
Gross Unrealized Gains	19	6
Gross Unrealized Loss	(132)	(296)
Estimated Fair Value	69,462	70,341
Cash and cash equivalents	0	0
Short-term marketable investments	69,462	70,341
Municipal Securities | Level 2
Amortized Costs	5,501	3,385
Gross Unrealized Gains	3	3
Gross Unrealized Loss	0	(1)
Estimated Fair Value	5,504	3,387
Cash and cash equivalents	0	0
Short-term marketable investments	5,504	3,387
Asset-backed Securities | Level 2
Amortized Costs	21,960	27,063
Gross Unrealized Gains	6	1
Gross Unrealized Loss	(59)	(119)
Estimated Fair Value	21,907	26,945
Cash and cash equivalents	0	0
Short-term marketable investments	21,907	26,945
Agency Bond | Level 2
Amortized Costs	4,221	4,183
Gross Unrealized Gains	0	0
Gross Unrealized Loss	(40)	(35)
Estimated Fair Value	4,181	4,148
Cash and cash equivalents	0	0
Short-term marketable investments	$ 4,181	4,148
International Government Securities | Level 2
Amortized Costs		2,497
Gross Unrealized Gains		0
Gross Unrealized Loss		(5)
Estimated Fair Value		2,492
Cash and cash equivalents		0
Short-term marketable investments		$ 2,492

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