Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows From Operating Activities
Net loss	$ (26,635)	$ (34,803)
Adjustments to reconcile net loss to net cash used in operating activities:
(Gain) loss on disposal of fixed assets	63	(4)
Depreciation and amortization	980	1,267
Stock-based compensation	5,193	6,903
Donation of fixed assets	0	25
Increase (decrease) in cash resulting from changes in:
Accounts receivable	380	(236)
Grants receivable	90	(145)
Inventory	352	(292)
Prepaid expenses and other assets	118	5
Accounts payable	164	(707)
Accrued expenses	(792)	(760)
Deferred revenue	(162)	(157)
Deferred rent	(126)	47
Net cash used in operating activities	(20,375)	(28,857)
Cash Flows From Investing Activities
Purchases of fixed assets	(79)	(226)
Proceeds from disposals of fixed assets	3	4
Purchases of intangible assets	0	(70)
Net cash used in investing activities	(76)	(292)
Cash Flows From Financing Activities
Proceeds from issuance of common stock	13,327	9,381
Employee taxes paid related to net share settlement of equity awards	(223)	(94)
Proceeds from exercise of stock options	50	826
Net cash provided by financing activities	13,154	10,113
Effect of currency exchange rate changes on cash and cash equivalents	0	11
Net Decrease in Cash and Cash Equivalents	(7,297)	(19,025)
Cash, cash equivalents, and restricted cash at beginning of period	43,853	62,878
Cash, cash equivalents, and restricted cash at end of period	36,556	43,853
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	36,477	43,726
Restricted cash	79	127
Cash, cash equivalents, and restricted cash at end of period	36,556	43,853
Supplemental Disclosure of Cash Flow Information:
Income Taxes	$ 3	$ 2