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Balance Sheet Components
 6 Months Ended
Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]  
Balance Sheet Components Balance Sheet Components
The Company’s audited consolidated balance sheet at June 30, 2021, as reported, included the JV Company’s assets and liabilities, after intercompany eliminations. However, the JV Company's assets and liabilities were not included in the Company’s unaudited Condensed Consolidated Balance Sheet at December 31, 2021 due to the deconsolidation of the JV Company on December 2, 2021 as discussed in more detail in Notes 1 and 2 above.
Accounts receivable, net:
 December 31,
2021		June 30,
2021
(in thousands)
Accounts receivable$45,485 $48,234 
Less: Allowance for price adjustments(13,794)(12,415)
Less: Allowance for doubtful accounts(30)(30)
Accounts receivable, net$31,661 $35,789 

Inventories:
 December 31,
2021		June 30,
2021
(in thousands)
Raw materials$46,045 $68,900 
Work in-process63,362 68,824 
Finished goods19,677 16,569 
 $129,084 $154,293 

Other current assets:
December 31,
2021		June 30,
2021
(in thousands)
VAT receivable$365 $1,539 
Other prepaid expenses2,475 1,465 
Prepaid insurance2,001 2,615 
Prepaid maintenance982 1,670 
Prepayment to supplier2,129 2,540 
Prepaid income tax2,692 2,221 
Interest receivable— 2,207 
Customs deposit— 270 
Other receivables668 68 
$11,312 $14,595 
Property, plant and equipment, net:
 December 31,
2021		June 30,
2021
(in thousands)
Land$4,877 $4,877 
Building14,785 71,454 
Manufacturing machinery and equipment255,652 515,320 
Equipment and tooling25,616 27,017 
Computer equipment and software35,118 41,518 
Office furniture and equipment2,648 3,814 
Leasehold improvements34,655 74,733 
Land use rights— 9,319 
 373,351 748,052 
Less: accumulated depreciation(221,178)(348,749)
 152,173 399,303 
Equipment and construction in progress44,570 37,674 
Property, plant and equipment, net$196,743 $436,977 

Intangible assets, net:
December 31,
2021		June 30,
2021
(in thousands)
Patents and technology rights$18,037 $18,037 
Trade name268 268 
Customer relationships1,150 1,150 
19,455 19,455 
Less: accumulated amortization(7,994)(6,314)
11,461 13,141 
Goodwill269 269 
Intangible assets, net$11,730 $13,410 

Estimated future minimum amortization expense of intangible assets is as follows (in thousands):
Year ending June 30,
2022 (Remaining)$1,680 
20233,286 
20243,249 
20253,246 
$11,461 
Other long-term assets:
December 31,
2021		June 30,
2021
(in thousands)
Prepayments for property and equipment$27,661 $14,882 
Investment in a privately held company100 100 
Customs deposit1,802 1,120 
Deposit with supplier6,495 — 
Other long-term deposits20 927 
Office leases deposits1,131 1,100 
Other722 740 
 $37,931 $18,869 
Accrued liabilities:
December 31,
2021		June 30,
2021
(in thousands)
Accrued compensation and benefits$41,058 $32,756 
Warranty accrual2,320 2,795 
Stock rotation accrual3,765 3,917 
Accrued professional fees2,499 3,017 
Accrued inventory2,142 1,138 
Accrued facilities related expenses1,843 2,536 
Accrued property, plant and equipment12,735 8,688 
Other accrued expenses4,215 6,793 
Customer deposit23,592 7,139 
ESPP payable1,043 715 
 $95,212 $69,494 
The activities in the warranty accrual, included in accrued liabilities, are as follows:
Six Months Ended December 31,
20212020
(in thousands)
Beginning balance$2,795 $709 
Additions 287 239 
Utilization(762)(181)
Ending balance$2,320 $767 
The activities in the stock rotation accrual, included in accrued liabilities, are as follows:
Six Months Ended December 31,
20212020
(in thousands)
Beginning balance$3,917 $3,358 
Additions1,756 4,180 
Utilization(1,908)(3,645)
Ending balance$3,765 $3,893 
Other long-term liabilities:
 December 31,
2021		June 30,
2021
(in thousands)
Deferred payroll taxes$— $1,219 
Customer deposits77,684 42,000 
Other— 904 
Other long-term liabilities$77,684 $44,123 

Customer deposits are payments received from customers for securing future product shipments. As of December 31, 2021, $64.4 million were from Customer A and Customer B, and $13.3 million were from other customers. As of June 30, 2021, $42.0 million were from Customer A and Customer B.