Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (30,625)	$ (32,201)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	11,553	8,533
Stock-based compensation expense	19,845	15,601
Other	384	508
Changes in operating assets and liabilities:
Accounts receivable	22,522	5,492
Prepaid expenses and other assets	(5,450)	(2,758)
Accounts payable	(530)	757
Accrued compensation and benefits and other liabilities	2,786	(743)
Deferred revenue	(3,453)	5,654
Deferred rent	(431)	2,994
Net cash provided by operating activities	16,601	3,837
Cash flows from investing activities:
Purchases of property and equipment	(14,394)	(8,490)
Decrease in restricted cash	91	0
Purchases of short-term investments	(55,126)	(65,404)
Proceeds from sale and maturity of short-term investments	56,432	87,415
Capitalized software development costs	(1,486)	(1,733)
Net cash provided by (used in) investing activities	(14,483)	11,788
Cash flows from financing activities:
Proceeds from employee stock purchase plan	3,029	2,504
Proceeds from exercise of employee stock options	17,264	9,902
Net cash provided by financing activities	20,293	12,406
Net increase in cash and cash equivalents	22,411	28,031
Cash and cash equivalents, beginning of period	88,305	65,914
Cash and cash equivalents, end of period	110,716	93,945
Supplemental disclosure of cash flow information:
Cash paid for interest and income taxes	193	102
Noncash investing and financing activities:
Property and equipment purchased but not yet paid	$ 1,042	$ 5,808