Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net loss	$ (48,293)	$ (35,324)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	11,058	6,089
Stock-based compensation expense	16,603	7,592
Other	817	208
Changes in operating assets and liabilities, net of acquisition of business:
Accounts receivable	(10,010)	(6,754)
Prepaid expenses and other assets	(1,265)	(1,443)
Accounts payable	859	(777)
Accrued compensation and benefits and other liabilities	4,068	2,936
Deferred rent	199	771
Deferred revenue	28,750	13,273
Net cash provided by (used in) operating activities	2,786	(13,429)
Cash flows from investing activities:
Purchases of property and equipment	(8,119)	(10,628)
Acquisition of business, net of cash acquired	(5,498)	(2,262)
Increase in restricted cash	(3,400)	(25)
Purchases of short-term investments	(80,046)	(37,189)
Proceeds from sale and maturity of short-term investments	55,692
Capitalized software development costs	(5,316)	(6,667)
Net cash used in investing activities	(46,687)	(56,771)
Cash flows from financing activities:
Proceeds from issuances of preferred stock, net of issuance costs		97,243
Proceeds from initial public offering, net of issuance costs		120,601
Principal payments on debt		(271)
Proceeds from issuance of common stock	10,545	914
Net cash provided by financing activities	10,545	218,487
Net increase (decrease) in cash and cash equivalents	(33,356)	148,287
Cash and cash equivalents, beginning of period	105,257	19,453
Cash and cash equivalents, end of period	71,901	167,740
Supplemental disclosure of cash flow information:
Cash paid for interest	76	91
Noncash investing and financing activities:
Issuance of common stock for the acquisition of business	6,777	1,826
Conversion of preferred stock warrants to common stock warrants		631
Net exercise of preferred stock warrants in connection with the initial public offering		280
Property and equipment purchased but not paid yet	$ 1,227	1,052
Accrued initial public offering costs		$ 677