Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Cash flows from operating activities
Net loss	$ (37,494)	$ (22,851)	$ (73,667)	$ (94,898)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense			1,606	1,700
Non-cash interest expense			4,593	4,931
Share-based compensation expense			18,663	13,538
Loss on extinguishment and conversion of notes	0	0	0	(6,457)
Realized gain or loss on investments, net			(36)	0
Change in fair value of notes payable			65	200
Changes in operating assets and liabilities:
Accounts receivable			424	(12,879)
Prepaid expenses and other assets			(41,525)	(1,098)
Accounts payable and other accrued expenses			(447)	4,291
Accrued outsourcing costs			7,506	2,946
Accrued compensation and benefits			882	173
Deferred rent			(305)	134
Deferred revenue			(4,881)	(17,117)
Other non-current liabilities			(304)	468
Net cash used in operating activities			(87,426)	(91,154)
Cash flows from investing activities
Purchases of property and equipment			(1,455)	(1,122)
Proceeds from investment			35	0
Proceeds from investment			(390,146)	(395,369)
Purchases of marketable securities			306,978	138,241
Net cash used in investing activities			(84,588)	(258,250)
Cash flows from financing activities
Net proceeds from employee stock purchases and options exercised			12,600	18,274
Payment of note payable			(15,000)	0
Proceeds from the modification of long-term debt, net			33,776	0
Payment for debt issuance costs			0	4,306
Net cash provided by financing activities			153,902	297,326
Net decrease in cash and cash equivalents			(18,112)	(52,078)
Cash and cash equivalents at beginning of period			114,748	125,933	$ 125,933
Cash and cash equivalents at end of period	96,636	73,855	96,636	73,855	$ 114,748
Supplemental disclosure of cash flow information
Cash paid for interest			3,650	2,260
Change in unrealized gain (loss) on marketable securities	$ 274	$ (81)	626	(681)
Follow on offering
Cash flows from financing activities
Net proceeds from the issuance of common stock			0	258,750
Offering costs for issuance of common stock			0	(15,732)
Market offering
Cash flows from financing activities
Net proceeds from the issuance of common stock			125,043	41,216
Offering costs for issuance of common stock			$ (2,517)	$ (876)