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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities |  |  |  |  |
Net loss | $ (43,368) | $ (18,985) | $ (33,625) | $ (59,663) | $ (60,691)
Adjustments to reconcile net income to net cash used in operating activities: |  |  |  |  |
Loss (gain) on disposal of property, plant and equipment | 6 | 56 | 207 | (458) | 1,204
Depreciation of property, plant and equipment | 9,475 | 7,207 | 16,097 | 14,676 | 12,180
Amortization of land use right and intangible assets | 376 | 352 | 695 | 711 | 566
Changes in fair value of convertible notes | 6,843 |  |  |  |
Reversal of doubtful accounts | (196) | (863) | (240) | (4,250) | 10,142
Provision for obsolete inventories | 6,098 | 646 | 1,343 | 4,233 | 13,622
Impairment loss from property, plant and equipment | 258 | 644 | 567 | 2,908 | 1,239
Product warranty | 9,057 | 951 | 3,477 | 3,501 | 8,342
Changes in operating assets and liabilities: |  |  |  |  |
Notes receivable | 3,352 | 14,167 | 13,940 | 31,834 | 16,453
Accounts receivable | 11,813 | 13,451 | (3,599) | 46,928 | 20,627
Inventories | (16,134) | 4,269 | 13,611 | 10,446 | 7,108
Prepaid expenses and other current assets | 175 | (821) | (1,693) | 1,424 | 10,696
Deferred tax assets, net |  |  |  |  | 5,887
Amount due from/to related parties |  |  | 1,872 | (1,158) | (423)
Other non-current assets | 33 | 94 | (139) | 280 | 747
Notes payable | (3,989) | (15,094) | (1,643) | (25,896) | (25,630)
Accounts payable | 1,390 | (4,747) | 3,818 | (12,880) | (28,380)
Advance from customers | 167 | (1,058) | (1,395) | 2,296 | 579
Accrued expenses and other liabilities | (381) | (9) | 2,256 | (1,480) | 213
Income tax payables |  |  | 7 | (81) | 27
Net cash generated from (used in) operating activities | (15,025) | 260 | 15,556 | 13,371 | (5,492)
Cash flows from investing activities |  |  |  |  |
Purchases of property, plant and equipment | (29,858) | (11,914) | (18,645) | (20,260) | (29,812)
Purchase of intangible assets |  |  |  |  | (551)
Proceeds on disposal of property, plant and equipment |  | (48) | 13 | 24 | 35
Purchase of short-term investments |  | (1,999) | (4,635) | (20,353) | (17,997)
Proceeds from maturity of short-term investments |  | 2,522 | 5,593 | 36,635 | 204,373
Net cash used in investing activities | (29,858) | (11,439) | (17,674) | (3,954) | 156,048
Cash flows from financing activities |  |  |  |  |
Proceeds from borrowings | 26,603 | 9,473 | 17,308 | 17,735 | 62,432
Repayment of loan |  |  |  | (14,475) |
Repayment of bank borrowings | (12,265) | (11,894) | (17,815) | (71,674) | (41,913)
Loans borrowing from related parties | 8,426 | 10,456 | 18,889 | 15,142 | 53,110
Repayment of related party loans | (8,426) | (10,033) | (18,889) | (15,142) | (53,110)
Repurchase of Series B2 Preferred |  |  |  |  | (3,728)
Repurchase shares from exiting noncontrolling interests | (33,047) |  |  | (32,700) | (211,566)
Issuance of convertible notes | 57,500 |  |  |  |
Payment for transaction fee in connection with the merger transaction | (2,327) |  |  |  |
Issuance of convertible bonds |  |  |  | 48,934 | 24,869
Net cash (used in)/generated from financing activities | 36,464 | (1,998) | (507) | (52,180) | (169,906)
Effect of exchange rate changes | 1,050 | (1,539) | 2,037 | (994) | (12,623)
Decrease in cash, cash equivalents and restricted cash | (7,369) | (14,716) | (588) | (43,757) | (31,973)
Cash, cash equivalents and restricted cash at beginning of the period | 41,196 | 41,784 | 41,784 | 85,541 | 117,514
Cash, cash equivalents and restricted cash at end of the period | 33,827 | 27,068 | 41,196 | 41,784 | 85,541
Reconciliation to amounts on consolidated balance sheets |  |  |  |  |
Cash and cash equivalents | 13,367 | 21,759 | 21,496 | 27,978 | 60,880
Restricted cash | 20,460 | 5,309 | 19,700 | 13,806 | 24,661
Total cash, cash equivalents and restricted cash | 33,827 | 27,068 | 41,196 | 41,784 | 85,541
Supplemental disclosure of cash flow information |  |  |  |  |
Interest paid | 1,376 | 1,032 | 1,969 | 2,487 | 2,020
Income tax paid |  |  |  | 58 | 511
Non-cash investing and financing activities |  |  |  |  |
Payable for redemption of noncontrolling interest | 97,979 | 119,567 | 124,316 | 114,870 | 137,896
Payable for purchase of property, plant and equipment | $ 14,103 | $ 17,096 | $ 15,122 | $ 23,515 | $ 33,842

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- Definition Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3367-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition The cash outflow to reacquire preferred stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + 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=123570139&loc=d3e3213-108585 + Details
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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=123570139&loc=d3e3213-108585 + Details
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- Definition The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers. + 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=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3,4)) -URI http://asc.fasb.org/extlink&oid=123368208&loc=d3e12565-110249 + Details
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