Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows From Operating Activities
Net loss	$ (16,826)	$ (18,710)
Adjustments to reconcile net loss to net cash used in operating activities:
(Gain) loss on disposal of fixed assets	19	(113)
(Gain) loss on lease termination	0	(525)
Depreciation and amortization	41	1,142
Stock-based compensation	5,556	4,108
Inventory write-off	0	214
Increase (decrease) in cash resulting from changes in:
Accounts receivable	111	392
Grants receivable	0	55
Inventory	0	276
Prepaid expenses and other assets	(1,135)	269
Accounts payable	(439)	92
Accrued expenses	(650)	(1,459)
Deferred revenue	0	(525)
Operating Right-of-use asset and lease liability, net	0	(98)
Net cash used in operating activities	(13,323)	(14,882)
Cash Flows From Investing Activities
Purchases of fixed assets	(405)	0
Proceeds from disposals of fixed assets	12	747
Net cash provided by (used in) investing activities	(393)	747
Cash Flows From Financing Activities
Proceeds from issuance of common stock, net	23,798	4,996
Employee taxes paid related to net share settlement of equity awards	(4)	(61)
Proceeds from exercise of stock options	42	0
Purchase of treasury stock	(1)	0
Net cash provided by financing activities	23,835	4,935
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	10,119	(9,200)
Cash, cash equivalents, and restricted cash at beginning of period	27,356	36,556
Cash, cash equivalents, and restricted cash at end of period	37,475	27,356
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets
Cash and cash equivalents	37,364	27,356
Restricted cash	111	0
Cash, cash equivalents, and restricted cash at end of period	37,475	27,356
Supplemental Disclosure of Cash Flow Information:
Restricted cash released	0	79
Tenant improvements funded by landlord	0	37
Assets held for sale	0	33
Income taxes paid	$ 2	$ 2