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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (19,193) $ (22,678)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 5,341 5,352
Stock-based compensation expense 4,661 3,485
Provision for excess and obsolete inventory 1,902 1,762
Deferred income taxes (2,403) (1,221)
Change in fair value of contingent consideration (5,850) 3,060
Non-cash interest income (49) (94)
Other non-cash items 525 272
Unrealized foreign exchange loss/(gain) on cash and cash equivalents (186) 363
Changes in operating asset and liability accounts:    
Accounts receivable (3,760) 5,193
Inventory (3,307) 8,106
Prepaid expenses and other current assets (420) 823
Accounts payable and accrued expenses 4,695 (5,047)
Deferred revenue (933) (8,057)
Net cash used in operating activities (18,977) (8,681)
Cash flows from investing activities:    
Purchase of property, plant and equipment (938) (1,764)
Sale of marketable securities 0 30,152
Cash paid for acquisition, net of cash received (11,479) (26,000)
Proceeds from the maturity of marketable securities 5,189 0
Change in other assets 65 81
Net cash provided by (used in) investing activities (7,163) 2,469
Cash flows from financing activities:    
Repurchase of treasury stock (46) (927)
Repayment of debt (53) 0
Proceeds from public equity offering, net 0 51,477
Proceeds from exercise of employee stock options and ESPP 241 278
Net cash provided by financing activities 142 50,828
Effect of exchange rate changes on cash, cash equivalents and restricted cash (55) 59
Net increase (decrease) in cash, cash equivalents and restricted cash (26,053) 44,675
Cash, cash equivalents and restricted cash at beginning of year 75,539 30,864
Cash, cash equivalents and restricted cash at end of year 49,486 75,539
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 531 594
Non-cash investing and financing activities    
Issuance of common stock to settle liabilities 2,761 395
Northeast Power Systems, Inc (NEPSI) [Member]    
Non-cash investing and financing activities    
Issuance of common stock in connection with the purchase of Northeast Power Systems, Inc 0 12,433
Neeltran Inc. [Member]    
Non-cash investing and financing activities    
Issuance of common stock in connection with the purchase of Northeast Power Systems, Inc $ 4,387 $ 0