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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (22,678)	$ (17,096)	$ (22,678)	$ (17,096)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	5,352	4,308
Stock-based compensation expense	3,485	1,922
Provision for excess and obsolete inventory	1,762	1,276
Deferred income taxes	(1,221)	(1,714)	(1,221)	(1,714)
Change in fair value of contingent consideration	3,060
Change in fair value of warrants		(4,648)		4,648
Non-cash interest income	(94)	(308)
Other non-cash items	272	329
Unrealized foreign exchange loss/(gain) on cash and cash equivalents	363	(319)
Changes in operating asset and liability accounts:
Accounts receivable	5,193	(9,159)
Inventory	8,106	(8,143)
Prepaid expenses and other current assets	823	373
Accounts payable and accrued expenses	(5,047)	5,894
Deferred revenue	(8,057)	10,788
Net cash used in operating activities	(8,681)	(16,497)
Cash flows from investing activities:
Purchase of property, plant and equipment	(1,764)	(3,630)
Proceeds from the sale of property, plant and equipment		3,001
Purchase of marketable securities		(35,000)
Sale of marketable securities	30,152
Cash paid for acquisition, net of cash received	(26,000)
Purchase of intangible assets		(1,000)
Change in other assets	81	8
Net cash provided by (used in) investing activities	2,469	(36,621)
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(927)	(565)
Proceeds from exercise of warrants		6,139
Proceeds from public equity offering, net	51,477
Proceeds from exercise of employee stock options and ESPP	278	202
Net cash provided by financing activities	50,828	5,776
Effect of exchange rate changes on cash, cash equivalents and restricted cash	59	8
Net increase (decrease) in cash, cash equivalents and restricted cash	44,675	(47,334)
Cash, cash equivalents and restricted cash at beginning of year	30,864	78,198	30,864
Cash, cash equivalents and restricted cash at end of year	75,539	30,864	75,539	$ 30,864
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	594	3,653
Non-cash investing and financing activities
Issuance of common stock to settle liabilities	395	407
Hercules [Member]
Non-cash investing and financing activities
Issuance of common stock		294
Northeast Power Systems, Inc (NEPSI) [Member]
Adjustments to reconcile net loss to net cash used in operations:
Change in fair value of contingent consideration			$ 3,000
Non-cash investing and financing activities
Issuance of common stock	$ 12,433

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