Balance Sheet Components

9 Months Ended

Mar. 31, 2020

Balance Sheet Related Disclosures [Abstract]

Accounts receivable, net:



	March 31, 2020			June 30, 2019
	(in thousands)
Accounts receivable	$	50,014		$	48,401
Less: Allowance for price adjustments	(32,514		)	(24,075		)
Less: Allowance for doubtful accounts	(30		)	(30		)
Accounts receivable, net	$	17,470		$	24,296

Inventories:



	March 31, 2020		June 30, 2019
	(in thousands)
Raw materials	$	56,750	$	59,076
Work in-process	55,606		38,214
Finished goods	15,039		14,353
	$	127,395	$	111,643

Other current assets:



	March 31, 2020		June 30, 2019
	(in thousands)
VAT receivable	$	27,165	$	30,769
Other prepaid expenses	1,958		2,745
Prepaid insurance	900		939
Prepaid maintenance	593		481
Prepayment to supplier	769		583
Prepaid income tax	1,140		267
Customs deposit	162		114
Lease financing cost	—		825
Interest receivable	1,339		379
Payroll tax receivable	492		—
	$	34,518	$	37,102

Property, plant and equipment, net:



	March 31, 2020			June 30, 2019
	(in thousands)
Land	$	4,877		$	4,877
Building	58,640			36,205
Manufacturing machinery and facility equipment	440,823			303,750
Equipment and tooling	25,211			20,739
Computer equipment and software	38,651			34,048
Office furniture and equipment	3,368			3,243
Leasehold improvements	68,015			53,597
Land use rights	8,480			8,760
	648,065			465,219
Less: accumulated depreciation	(280,269		)	(252,982		)
	367,796			212,237
Equipment and construction in progress	44,522			197,500
Property, plant and equipment, net	$	412,318		$	409,737

Intangible assets, net:



	March 31, 2020			June 30, 2019
	(in thousands)
Patents and technology rights	$	18,037		$	18,037
Trade name	268			268
Customer relationships	1,150			1,150
	19,455			19,455
Less: accumulated amortization	(2,926		)	(2,842		)
	16,529			16,613
Goodwill	269			269
Intangible assets, net	$	16,798		$	16,882

Intangible assets of patents and technology rights are primarily related to a license agreement that the Company entered into with STMicroelectronics International N.V. (“STMicro”) on September 5, 2017, pursuant to which STMicro granted the Company a world-wide, royalty-free and fully-paid license to use its technologies to develop, market and distribute certain digital multi-phase controller products. As of March 31, 2020, the Company recorded $16.2 million of intangible assets related to STMicro. The Company begins amortizing such license fees when the technology has met the Company's qualification and is ready for its intended use in production.

Estimated future minimum amortization expense of intangible assets is as follows (in thousands):



Year ending June 30,
2020 (Remaining)	$	28
2021	2,548
2022	3,360
2023	3,286
2024	3,249
Thereafter	4,058
	$	16,529

Other long-term assets:



	March 31, 2020		June 30, 2019
	(in thousands)
Prepayments for property and equipment	$	3,747	$	4,846
Investment in a privately held company	100		700
Lease financing costs	—		1,758
Customs deposit	886		980
Other long-term deposits	839		889
Office leases deposits	1,039		1,031
Other	170		413
	$	6,781	$	10,617

Accrued liabilities:



	March 31, 2020		June 30, 2019
	(in thousands)
Accrued compensation and benefits	$	16,772	$	16,385
Warranty accrual	672		623
Stock rotation accrual	3,307		1,921
Accrued professional fees	5,261		1,721
Accrued inventory	487		857
Accrued facilities related expenses	1,995		4,233
Accrued financing lease costs	705		728
Accrued property, plant and equipment	9,745		11,527
ESPP payable	1,913		585
Customer deposit	2,556		351
Other accrued expenses	7,159		5,144
	$	50,572	$	44,075

The activities in the warranty accrual, included in accrued liabilities, are as follows:



	Nine Months Ended March 31,
	2020			2019
	(in thousands)
Beginning balance	$	623		$	535
Additions	852			189
Utilization	(803		)	(69		)
Ending balance	$	672		$	655

The activities in the stock rotation accrual, included in accrued liabilities, are as follows:



	Nine Months Ended March 31,
	2020			2019
	(in thousands)
Beginning balance	$	1,921		$	1,750
Additions	7,413			3,589
Utilization	(6,027		)	(3,616		)
Ending balance	$	3,307		$	1,723

Other long-term liabilities:



	March 31, 2020			June 30, 2019
	(in thousands)
Customer deposits	$	8,000	*	$	10,000	*
Computer software liabilities	2,356			3,701
Other	—			220
Other long-term liabilities	$	10,356		$	13,921

* Customer deposits are from Customer A and Customer B for securing future product shipments from the Company. The Company reclassified $2.0 million of the customer deposit to short term accrued liabilities during the nine months ended March 31, 2020 since the repayment of this amount is due within a year.