Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows From Operating Activities
Net loss	$ (18,710)	$ (26,635)
Adjustments to reconcile net loss to net cash used in operating activities:
(Gain) loss on disposal of fixed assets	(113)	63
(Gain) loss on lease termination	(525)	0
Depreciation and amortization	1,142	980
Stock-based compensation	4,108	5,193
Inventory write-off	214	0
Increase (decrease) in cash resulting from changes in:
Accounts receivable	392	380
Grants receivable	55	90
Inventory	276	352
Prepaid expenses and other assets	269	118
Accounts payable	92	164
Accrued expenses	(1,459)	(792)
Deferred revenue	(525)	(162)
Deferred rent	0	(126)
Operating Right-of-use asset and lease liability, net	(98)	0
Net cash used in operating activities	(14,882)	(20,375)
Cash Flows From Investing Activities
Purchases of fixed assets	0	(79)
Proceeds from disposals of fixed assets	747	3
Net cash provided by (used in) investing activities	747	(76)
Cash Flows From Financing Activities
Proceeds from issuance of common stock	4,996	13,327
Employee taxes paid related to net share settlement of equity awards	(61)	(223)
Proceeds from exercise of stock options	0	50
Net cash provided by financing activities	4,935	13,154
Net Decrease in Cash, Cash Equivalents, and Restricted Cash	(9,200)	(7,297)
Cash, cash equivalents, and restricted cash at beginning of period	36,556	43,853
Cash, cash equivalents, and restricted cash at end of period	27,356	36,556
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets
Cash and cash equivalents	27,356	36,477
Restricted cash	0	79
Cash, cash equivalents, and restricted cash at end of period	27,356	36,556
Supplemental Disclosure of Cash Flow Information:
Restricted cash released	79	0
Tenant improvements funded by landlord	37	0
Assets held for sale	33	0
Income taxes paid	$ 2	$ 3