Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows From Operating Activities
Net loss	$ (13,253)	$ (19,563)
Adjustments to reconcile net loss to net cash used in operating activities:
(Gain) loss on disposal of fixed assets	(2)	0
Depreciation and amortization	570	647
Stock-based compensation	2,553	4,350
Increase (decrease) in cash resulting from changes in:
Accounts receivable	408	(386)
Grants receivable	(308)	(149)
Inventory	(194)	54
Prepaid expenses and other assets	366	210
Accounts payable	(15)	(694)
Accrued expenses	(1,315)	(1,280)
Deferred revenue	(68)	81
Deferred rent	(88)	(72)
Net cash used in operating activities	(11,346)	(16,802)
Cash Flows From Investing Activities
Purchases of fixed assets	(11)	(56)
Proceeds from disposals of fixed assets	2	0
Purchases of intangible assets	0	(70)
Net cash used in investing activities	(9)	(126)
Cash Flows From Financing Activities
Proceeds from issuance of common stock and exercise of warrants, net	5,129	4,135
Employee taxes paid related to net share settlement of equity awards	(145)	(51)
Proceeds from exercise of stock options	0	825
Net cash provided by financing activities	4,984	4,909
Net decrease in cash, cash equivalents, and restricted cash	(6,371)	(12,019)
Cash, cash equivalents, and restricted cash at beginning of period	43,853	62,878
Cash, cash equivalents, and restricted cash at end of period	37,482	50,859
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	37,355	50,732
Restricted cash	127	127
Cash, cash equivalents, and restricted cash at end of period	37,482	50,859
Supplemental Disclosure of Cash Flow Information:
Income taxes paid	$ 3	$ 0