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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

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