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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |
Net (loss) income | $ (11,209) | $ 35,114
Adjustments to reconcile net (loss) income to net cash (used in)/provided by operations: |  |
Depreciation and amortization | 3,312 | 3,455
Stock-based compensation expense | 1,236 | 2,402
Provision for excess and obsolete inventory | 491 | 686
Gain on sale of minority interest | 0 | (127)
Deferred income taxes | (1,069) | (940)
Change in fair value of warrants | (4,648) | 2,658
Non-cash interest income | 0 | (168)
Other non-cash items | (22) | (752)
Unrealized foreign exchange (gain)/loss on cash and cash equivalents | (209) |
Changes in operating asset and liability accounts: |  |
Accounts receivable | (8,661) | (724)
Inventory | (6,968) | 3,320
Prepaid expenses and other assets | (332) | (1,380)
Accounts payable and accrued expenses | 2,648 | 4,603
Deferred revenue | 7,652 | (361)
Net cash (used in)/provided by operating activities | (17,779) | 47,786
Cash flows from investing activities: |  |
Purchase of property, plant and equipment | (2,926) | (709)
Proceeds from the sale of property, plant and equipment | 3,001 | 138
Purchase of marketable securities | (35,000) |
Proceeds from sale of minority interest | 0 | 127
Change in other assets | 37 | (206)
Net cash used in investing activities | (34,888) | (650)
Cash flows from financing activities: |  |
Employee taxes paid related to net settlement of equity awards | (565) | (456)
Proceeds from exercise of warrants | 6,139 |
Proceeds from exercise of employee stock options and ESPP | 100 | 71
Net cash (used in)/provided by financing activities | 5,674 | (385)
Effect of exchange rate changes on cash | 30 | (792)
Net (decrease)/increase in cash, cash equivalents and restricted cash | (46,963) | 45,959
Cash, cash equivalents and restricted cash at beginning of period | 78,198 | 34,248
Cash, cash equivalents and restricted cash at end of period | 31,235 | 80,207
Supplemental schedule of cash flow information: |  |
Cash paid for income taxes, net of refunds | 3,520 | 2,792
Issuance of common stock to settle liabilities | 242 | 235
Hercules [Member] |  |
Supplemental schedule of cash flow information: |  |
Issuance of common stock to Hercules to settle warrant liability | $ 294 | $ 0

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition The fair value of stock issued in noncash financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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