Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (7,052)	$ (2,270)
Adjustments to reconcile net loss to net cash used in operating activities:
Inventory write-off (reversal)	134	(7)
Depreciation and amortization	197	202
Licensing revenue from a related party	0	(5,000)
Stock-based compensation	497	104
Interest cost	54	189
Loss in joint venture	1,490	1,856
Changes in fair value of promissory note	1,024	1,658
Changes in operating assets and liabilities:
Accounts receivable	(629)	608
Inventory	(835)	(250)
Prepaid expenses and other current assets	(707)	(447)
Other assets	7	71
Accounts payable and accrued expenses	354	(540)
Deferred revenue	511	193
Accrued payroll and benefits	172	272
Net cash used in operating activities	(4,783)	(3,361)
Cash flows from investing activities:
Purchases of property and equipment	(346)	(22)
Investment in joint venture	(2,018)	(1,879)
Net cash used in investing activities	(2,364)	(1,901)
Cash flows from financing activities:
Proceeds from stock option exercise	134	0
Net cash provided by financing activities	134	0
Effect of foreign exchange rate changes on cash and cash equivalents	(25)	(4)
Net decrease in cash and cash equivalents	(7,038)	(5,266)
Cash and cash equivalents at beginning of period	9,500	14,648
Cash and cash equivalents at end of period	2,462	9,382
Supplemental disclosures of cash flow information:
Interest expense paid	150	0
Supplemental non-cash investing activity:
Equipment purchases	250	0
Supplemental non-cash financing activity:
Issuance of shares in connection with a service contract	500	0
Development loan reduction related to licensing revenue	$ 0	$ 5,000