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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net loss $ (14,161) $ (15,062)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 4,009 3,811
Stock-based compensation expense 3,513 2,597
Provision for excess and obsolete inventory 1,627 1,610
Deferred income taxes (2,136) (1,828)
Change in fair value of contingent consideration (4,440) 2,740
Non-cash interest income (49) (48)
Other non-cash items 407 291
Unrealized foreign exchange loss on cash and cash equivalents (118) 366
Changes in operating asset and liability accounts:    
Accounts receivable (4,528) 6,376
Inventory (279) 7,419
Prepaid expenses and other assets 85 6
Accounts payable and accrued expenses (236) (7,894)
Deferred revenue 381 (5,255)
Net cash used in operating activities (15,925) (4,871)
Cash flows from investing activities:    
Purchase of property, plant and equipment (710) (1,574)
Sale of marketable securities 0 25,006
Cash paid for acquisition, net of cash acquired (11,479) (26,000)
Proceeds from the maturity of marketable securities 5,189 0
Change in other assets (56) (5)
Net cash used in investing activities (7,056) (2,573)
Cash flows from financing activities:    
Repurchase of treasury stock (46) (927)
Repayment of debt (30) 0
Proceeds from public equity offering, net 0 51,477
Proceeds from exercise of employee stock options and ESPP 125 99
Net cash provided by financing activities 49 50,649
Effect of exchange rate changes on cash (51) 73
Net increase/(decrease) in cash, cash equivalents and restricted cash (22,983) 43,278
Cash, cash equivalents and restricted cash at beginning of period 75,539 30,864
Cash, cash equivalents and restricted cash at end of period 52,556 74,142
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 445 630
Non-cash investing and financing activities    
Issuance of common stock to settle liabilities 2,643 271
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