Alpha and Omega Semiconductor Limited (AOSL) 10-Q 12 Nov 19 2020 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Sep. 30, 2019	Oct. 25, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	ALPHA & OMEGA SEMICONDUCTOR Ltd
Entity Central Index Key	0001387467
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		24,552,987

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Current assets:
Cash and cash equivalents	$ 103,136	$ 121,893
Restricted cash	281	364
Accounts receivable, net	39,329	24,296
Inventories	118,558	111,643
Other current assets	33,092	37,102
Total current assets	294,396	295,298
Property, plant and equipment, net	404,005	409,737
Operating lease right-of-use assets, net	19,362
Intangible assets, net	16,854	16,882
Deferred income tax assets	4,813	4,822
Restricted cash - long-term	1,966	2,038
Other long-term assets	8,516	10,617
Total assets	749,912	739,394
Current liabilities:
Accounts payable	92,905	94,384
Accrued liabilities	49,397	44,075
Income taxes payable	1,574	1,541
Short-term debt	28,751	26,609
Finance lease liabilities	13,057	11,355
Operating lease liabilities	3,767
Total current liabilities	189,451	177,964
Long-term debt	56,357	59,380
Income taxes payable - long-term	1,006	993
Deferred income tax liabilities	425	466
Finance lease liabilities - long-term	38,047	43,381
Operating lease liabilities - long-term	15,815
Other long-term liabilities	11,258	13,921
Total liabilities	312,359	296,105
Commitments and contingencies (Note 10)
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares, issued and outstanding: none at September 30, 2019 and June 30, 2019	0	0
Common shares, par value $0.002 per share:
Authorized: 100,000 shares; Issued and outstanding: 31,194 shares and 24,550 shares, respectively at September 30, 2019 and 31,163 shares and 24,517 shares, respectively at June 30, 2019	62	62
Treasury shares at cost, 6,644 shares at September 30, 2019 and 6,646 shares at June 30, 2019	(66,227)	(66,240)
Additional paid-in capital	236,683	234,410
Accumulated other comprehensive loss	(5,876)	(2,693)
Retained earnings	126,481	125,485
Total Alpha and Omega Semiconductor Limited shareholder's equity	291,123	291,024
Noncontrolling interest	146,430	152,265
Total equity	437,553	443,289
Total liabilities and equity	$ 749,912	$ 739,394

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2019	Jun. 30, 2019
Common shares, par value (in dollars per share)	$ 0.002	$ 0.002
Common shares, authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	31,194,000	31,163,000
Common stock, shares outstanding (in shares)	24,550,000	24,517,000
Preferred stock, par value (in dollars per share)	$ 0.002	$ 0.002
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury shares (in shares)	6,644,000	6,646,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 117,802	$ 115,072
Cost of goods sold	90,870	82,461
Gross profit	26,932	32,611
Operating expenses
Research and development	12,368	11,384
Selling, general and administrative	15,185	20,352
Total operating expenses	27,553	31,736
Operating income (loss)	(621)	875
Other income (loss), net	(998)	262
Interest income (expenses)	171	(1,490)
Net loss before income taxes	(1,448)	(353)
Income tax expense	410	560
Net loss including noncontrolling interest	(1,858)	(913)
Net loss attributable to noncontrolling interest	(2,867)	(3,329)
Net income attributable to Alpha and Omega Semiconductor Limited	$ 1,009	$ 2,416
Net income per common share attributable to Alpha and Omega Semiconductor Limited
Basic (in dollars per share)	$ 0.04	$ 0.10
Diluted (in dollars per share)	$ 0.04	$ 0.10
Weighted average number of common shares attributable to Alpha and Omega Semiconductor Limited used to compute net income per share
Basic (in shares)	24,538	23,844
Diluted (in shares)	25,130	24,594

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Net income (loss) including noncontrolling interest	$ (1,858)	$ (913)
Other comprehensive income, net of tax
Foreign currency translation adjustment	(6,151)	(6,237)
Comprehensive loss	(8,009)	(7,150)
Noncontrolling interest	(5,835)	(6,318)
Comprehensive loss attributable to Alpha and Omega Semiconductor Limited	$ (2,174)	$ (832)

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Total AOS Shareholders' Equity	Common Shares	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings	Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	$ 426,162
Beginning balance at Jun. 30, 2018		$ 278,594	$ 61	$ (64,790)	$ 220,244	$ 440	$ 122,639	$ 147,568
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	421,672
Exercise of common stock options and release of RSUs	105	105	0		105
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	0	0		8			(8)
Withholding tax on restricted stock units	(109)	(109)			(109)
Repurchase of common shares under shares repurchase program	(1,501)	(1,501)		(1,501)
Share-based compensation	3,129	3,129			3,129
Net loss	2,416	2,416					2,416
Net loss attributable to noncontrolling interest	(3,329)							(3,329)
Net income (loss) including noncontrolling interest	(913)
Impact on retained earnings related to ASC 606 adoption | Accounting Standards Update 2016-16	1,036	1,036					1,036
Cumulative translation adjustment		(3,248)				(3,248)
Cumulative translation adjustment, attributable to noncontrolling interest								(2,989)
Cumulative translation adjustment, including portion attributable to noncontrolling interest	(6,237)
Ending balance at Sep. 30, 2018		280,422	61	(66,283)	223,369	(2,808)	126,083	141,250
Ending balance, including portion attributable to noncontrolling interest at Sep. 30, 2018	421,672
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	421,672
Beginning balance, including portion attributable to noncontrolling interest	443,289
Beginning balance at Jun. 30, 2019	291,024	291,024	62	(66,240)	234,410	(2,693)	125,485	152,265
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	437,553
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	0	0		13			(13)
Withholding tax on restricted stock units	(96)	(96)			(96)
Share-based compensation	2,369	2,369			2,369
Net loss	1,009	1,009					1,009
Net loss attributable to noncontrolling interest	(2,867)							(2,867)
Net income (loss) including noncontrolling interest	(1,858)
Cumulative translation adjustment		(3,183)				(3,183)
Cumulative translation adjustment, attributable to noncontrolling interest								(2,968)
Cumulative translation adjustment, including portion attributable to noncontrolling interest	(6,151)
Ending balance at Sep. 30, 2019	291,123	$ 291,123	$ 62	$ (66,227)	$ 236,683	$ (5,876)	$ 126,481	$ 146,430
Ending balance, including portion attributable to noncontrolling interest at Sep. 30, 2019	437,553
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	$ 437,553

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net income (loss) including noncontrolling interest	$ (1,858)	$ (913)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	10,904	7,870
Share-based compensation expense	2,369	3,129
Deferred income taxes, net	(32)	49
Loss on disposal of property and equipment	36	0
Changes in assets and liabilities:
Accounts receivable, net	(15,033)	(3,575)
Inventories	(5,823)	(7,867)
Other current and long-term assets	3,756	344
Accounts payable	753	9,653
Income taxes payable	47	20
Accrued and other liabilities	3,654	9,277
Net cash provided by (used in) operating activities	(1,227)	17,987
Cash flows from investing activities
Purchases of property and equipment excluding JV Company	(8,292)	(15,216)
Purchases of property and equipment in JV Company	(7,506)	(34,272)
Purchase of intangible assets	0	(5)
Net cash used in investing activities	(15,798)	(49,493)
Cash flows from financing activities
Withholding tax on restricted stock units	(96)	(109)
Proceeds from exercise of stock options	0	105
Payment for repurchases of common shares	0	(1,501)
Proceeds from borrowings	2,790	16,650
Repayments of borrowings	(2,085)	(223)
Principal payments on finance lease	(1,691)	(207)
Net cash provided by (used in) financing activities	(1,082)	14,715
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(805)	(1,579)
Net decrease in cash, cash equivalents and restricted cash	(18,912)	(18,370)
Cash, cash equivalents and restricted cash at beginning of period	124,295	131,724
Cash, cash equivalents and restricted cash at end of period	105,383	113,354
Supplemental disclosures of non-cash investing and financing information:
Property and equipment purchased but not yet paid	$ 8,334	$ 22,539

The Company and Significant Acc

The Company and Significant Accounting Policies	3 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company and Significant Accounting Policies	The Company and Significant Accounting Policies The Company Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company”, "AOS", "we" or "us") design, develop and supply a broad range of power semiconductors. The Company's portfolio of products targets high-volume applications, including personal computers, flat panel TVs, LED lighting, smart phones, battery packs, quick chargers, home appliances, consumer and industrial motor controls and power supplies for TVs, computers, servers and telecommunications equipment. The Company conducts its operations primarily in the United States of America (“USA”), Hong Kong, China, and South Korea. Basis of Preparation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Article 10 of Securities and Exchange Commission Regulation S-X, as amended. They do not include all information and footnotes necessary for a fair presentation of financial position, results of operations and cash flows in conformity with U.S. GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2019 . All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the results of operations for the periods presented have been included in the interim periods. Operating results for the three months ended September 30, 2019 are not necessarily indicative of the results that may be expected for the fiscal year ending June 30, 2020 or any other interim period. The condensed consolidated balance sheet at June 30, 2019 is derived from the audited financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2019 . During the quarter ended September 30, 2019, the Company corrected the prior year amount of property and equipment purchased but not yet paid in the supplemental disclosures of non-cash investing and financing information by decreasing it by $34.7 million , from $57.2 million to $22.5 million . This disclosure change had no effect on the consolidated statements of operations and cash flows for the quarter ended September 30, 2018. Leases On July 1, 2019, the Company adopted Topic 842, Leases, using the modified retrospective method. Results for reporting periods beginning after July 1, 2019 were presented under Topic 842, while prior period amounts were not adjusted and continue to be reported in accordance with its historic accounting under Topic 840. The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use ("ROU") assets, current operating lease liabilities and long-term operating lease liabilities on the Company's condensed consolidated balance sheets. Finance leases are included in property, plant and equipment, finance lease liabilities and long-term finance leases liabilities on the condensed consolidated balance sheets. The Company elected the practical expedient permitted under the transition guidance, which allowed the Company to carryforward its historical lease classification, the Company's assessment on whether a contract was or contains a lease, and its initial direct costs for any leases that existed prior to July 1, 2019. The Company elected to combine its lease and non-lease components as a single lease component for all asset classes. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. The Company uses an estimate of its incremental borrowing rate based on the information available at the lease commencement date. The operating lease ROU assets also include any lease payments made and excludes lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise such options. Operating lease expense is generally recognized on a straight-line basis over the lease term. Variable lease payments are expensed as incurred and are not included within the operating lease ROU asset and lease liability calculation. The Company does not record leases on the condensed consolidated balance sheet with a term of one year or less. See Note 6 for further details. Joint Venture In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China (the "Chongqing Funds") to form a joint venture, (the "JV Company"), for a new state-of-the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing (the "Joint Venture"). As of September 30, 2019, the Company owns 51% , and the Chongqing Funds own 49% of the equity interest in the JV Company. The Joint Venture is accounted for under the provisions of the consolidation guidance since the Company has a controlling financial interest. The JV Company has continued ramping up its production of assembly and testing during the September 2019 quarter. In July 2019, the JV Company commenced limited mass production at the 12-inch wafer fabrication facility. Use of Estimates The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. To the extent there are material differences between these estimates and actual results, the Company's condensed consolidated financial statements will be affected. On an ongoing basis, the Company evaluates the estimates, judgments and assumptions including those related to stock rotation returns, price adjustments, allowance for doubtful accounts, inventory reserves, warranty accrual, income taxes, leases, share-based compensation, and useful lives for property, plant and equipment and intangible assets. Share-based Compensation Expense The Company recognizes expense related to share-based compensation awards that are ultimately expected to vest based on estimated fair values on the date of grant. The fair value of restricted share units is based on the market value of the Company's common share on the date of grant. For restricted stock awards subject to market conditions, the fair value of each restricted stock award is estimated at the date of grant using the Monte-Carlo pricing model. The fair value of stock options is estimated on the date of grant using the Black-Scholes option valuation model. Share-based compensation expense is recognized on the accelerated attribution basis, net of estimated forfeitures, over the requisite service period of the award, which generally equals the vesting period. Fair Value of Financial Instruments The fair value of cash equivalents is based on observable market prices and have been categorized in Level 1 in the fair value hierarchy. Cash equivalents consist primarily of short term bank deposits. The carrying values of financial instruments such as cash and cash equivalents, accounts receivable and accounts payable approximate their carrying values due to their short-term maturities. The carrying value of the company's debt is considered a reasonable estimate of fair value which is estimated by considering the current rates available to the Company for debt of the same remaining maturities, structure and terms of the debts. Comprehensive Income (Loss) Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company's accumulated other comprehensive income (loss) consists of cumulative foreign currency translation adjustments. Total comprehensive income (loss) is presented in the condensed consolidated statements of comprehensive income (loss). Recent Accounting Pronouncements Recently Issued Accounting Standards not yet adopted In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2018-15 “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract ("ASU 2018-15”). These amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contact with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by these amendments. ASU 2018-15 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2019. Early adoption is permitted. The Company is currently assessing the impact that adoption of this guidance will have on its consolidated financial statements. In August 2018, the FASB issued Accounting Standard Updates ("ASU") ASU No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement ("ASU 2018-13”). ASU 2018-13 amends existing fair value measurement disclosure requirements by adding, changing, or removing certain disclosures. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. ASU No. 2018-13 is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2019. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses ("ASU 2016-13"). This accounting standard update changes the accounting for recognizing impairments of financial assets. Under the update, credit losses for certain types of financial instruments will be estimated based on expected losses. The update also modifies the impairment models for available-for-sale debt securities and for purchased financial assets with credit deterioration since their origination. This update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently evaluating the impact of this accounting standard update on its Consolidated Financial Statements. Recently Adopted Accounting Standards In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). This guidance requires a dual approach for lessee accounting under which a lessee accounts for leases as finance leases or operating leases. Both finance and operating leases result in the lessee recognizing a right-of-use asset and a corresponding liability on its balance sheet, with differing methodology for income statement recognition. The Company adopted this standard as of July 1, 2019, using the modified retrospective transition method and recorded a cumulative-effect balance sheet adjustment. As a result of adopting ASU 2016-02 on July 1, 2019, the Company recognized operating lease right-of-use assets and corresponding operating lease liabilities of approximately $21 million each from existing leases on the Company's condensed consolidated balance sheet. See Note 6 for further details. In June 2018, the FASB issued ASU 2018-07, "Compensation -Stock Compensation: Improvement to Nonemployees Share-Based Payment Accounting ("ASU 2018-07"), which expands the scope of Topic 718 to include all share-based payment transactions for acquiring goods and services from nonemployees. ASU 2018-07 specifies that Topic 718 applies to all share-based payment transactions in which the grantor acquires goods and services to be used or consumed in its own operations by issuing share-based payment awards. ASU 2018-07 also clarifies that Topic 718 does not apply to share-based payments used to effectively provide (1) financing to the issuer or (2) awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under ASC 606. ASU 2018-07 had no material impact on the Company's consolidated financial statements.

Net Income Per Common Share Att

Net Income Per Common Share Attributable to Alpha and Omega Semiconductor Limited	3 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	Net Income Per Common Share Attributable to Alpha and Omega Semiconductor Limited The following table presents the calculation of basic and diluted net income per share attributable to common shareholders: Three Months Ended September 30, 2019 2018 (in thousands, except per share data) Numerator: Net income attributable to Alpha and Omega Semiconductor Limited $ 1,009 $ 2,416 Denominator: Basic: Weighted average number of common shares used to compute basic net income per share 24,538 23,844 Diluted: Weighted average number of common shares used to compute basic net income per share 24,538 23,844 Effect of potentially dilutive securities: Stock options, RSUs and ESPP shares 592 750 Weighted average number of common shares used to compute diluted net income per share 25,130 24,594 Net income per share attributable to Alpha and Omega Semiconductor Limited: Basic $ 0.04 $ 0.10 Diluted $ 0.04 $ 0.10 The following potential dilutive securities were excluded from the computation of diluted net income per share as their effect would have been anti-dilutive: Three Months Ended September 30, 2019 2018 (in thousands) Employee stock options and RSUs 338 405 ESPP 961 216 Total potential dilutive securities 1,299 621

Concentration of Credit Risk an

Concentration of Credit Risk and Significant Customers	3 Months Ended
	Sep. 30, 2019
Risks and Uncertainties [Abstract]
Concentration of Credit Risk and Significant Customers	Concentration of Credit Risk and Significant Customers The Company manages its credit risk associated with exposure to distributors and direct customers on outstanding accounts receivable through the application and review of credit approvals, credit ratings and other monitoring procedures. In some instances, the Company also obtains letters of credit from certain customers. Credit sales, which are mainly on credit terms of 30 to 60 days , are only made to customers who meet the Company's credit requirements, while sales to new customers or customers with low credit ratings are usually made on an advance payment basis. The Company considers its trade accounts receivable to be of good credit quality because its key distributors and direct customers have long-standing business relationships with the Company and the Company has not experienced any significant write-offs of accounts receivable in the past. The Company closely monitors the aging of accounts receivable from its distributors and direct customers, and regularly reviews their financial positions, when available. Summarized below are individual customers whose revenue or accounts receivable balances were more than 10% of the respective total consolidated amounts: Three Months Ended September 30, Percentage of revenue 2019 2018 Customer A 28.8 % 27.7 % Customer B 35.1 % 38.0 % September 30, June 30, Percentage of accounts receivable Customer A 36.9 % 12.1 % Customer B 25.9 % 19.7 % Customer C 10.3 % 18.1 % Customer D * 13.3 % * Less than 10%

Balance Sheet Components

Balance Sheet Components	3 Months Ended
	Sep. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Components	Balance Sheet Components Accounts receivable, net: September 30, June 30, (in thousands) Accounts receivable $ 62,969 $ 48,401 Less: Allowance for price adjustments (23,610 ) (24,075 ) Less: Allowance for doubtful accounts (30 ) (30 ) Accounts receivable, net $ 39,329 $ 24,296 Inventories: September 30, June 30, (in thousands) Raw materials $ 61,627 $ 59,076 Work in-process 44,231 38,214 Finished goods 12,700 14,353 $ 118,558 $ 111,643 Other current assets: September 30, June 30, (in thousands) VAT receivable $ 27,719 $ 30,769 Other prepaid expenses 2,147 2,745 Prepaid insurance 1,192 939 Prepaid maintenance 940 481 Prepayment to supplier 613 583 Prepaid income tax 286 267 Customs deposit 174 114 Lease financing cost — 825 Other receivable 21 379 $ 33,092 $ 37,102 Property, plant and equipment, net: September 30, June 30, (in thousands) Land $ 4,877 $ 4,877 Building 58,333 36,205 Manufacturing machinery and facility equipment 420,317 303,750 Equipment and tooling 21,900 20,739 Computer equipment and software 37,755 34,048 Office furniture and equipment 3,307 3,243 Leasehold improvements 66,296 53,597 Land use rights 8,448 8,760 621,233 465,219 Less: accumulated depreciation (259,544 ) (252,982 ) 361,689 212,237 Equipment and construction in progress 42,316 197,500 Property, plant and equipment, net $ 404,005 $ 409,737 Intangible assets, net: September 30, June 30, (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 (2,870 ) (2,842 ) 16,585 16,613 Goodwill 269 269 Intangible assets, net $ 16,854 $ 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. This agreement allows the Company to develop and market digital power products, primarily in the computer server segment. As of September 30, 2019 , 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. Other long-term assets: September 30, June 30, (in thousands) Prepayments for property and equipment $ 3,927 $ 4,846 Investment in a privately held company 700 700 Lease financing costs — 1,758 Customs deposit 977 980 Other long-term deposits 1,558 889 Office leases deposits 1,047 1,031 Other 307 413 $ 8,516 $ 10,617 Accrued liabilities: September 30, June 30, (in thousands) Accrued compensation and benefits $ 16,410 $ 16,385 Warranty accrual 641 623 Stock rotation accrual 2,617 1,921 Accrued professional fees 1,983 1,721 Accrued inventory 1,628 857 Accrued facilities related expenses 2,068 4,233 Accrued financing lease costs 702 728 Accrued property, plant and equipment 11,499 11,527 ESPP payable 1,875 585 Customer deposit 2,645 351 Other accrued expenses 7,329 5,144 $ 49,397 $ 44,075 The activities in the warranty accrual, included in accrued liabilities, are as follows: Three Months Ended September 30, 2019 2018 (in thousands) Beginning balance $ 623 $ 535 Additions 21 136 Utilization (3 ) (39 ) Ending balance $ 641 $ 632 The activities in the stock rotation accrual, included in accrued liabilities, are as follows: Three Months Ended September 30, 2019 2018 (in thousands) Beginning balance $ 1,921 $ 1,750 Additions 2,565 748 Utilization (1,869 ) (723 ) Ending balance $ 2,617 $ 1,775 Other long-term liabilities: September 30, June 30, (in thousands) Customer deposits $ 8,000 * $ 10,000 * Computer software liabilities 3,258 3,701 Other — 220 Other long-term liabilities $ 11,258 $ 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 quarter ended September 30, 2019 since the repayment of this amount is due within a year.

Bank Borrowing Bank Borrowing

Bank Borrowing Bank Borrowing	3 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Bank Borrowing	Bank Borrowings Short-term borrowings On September 23, 2019, the JV Company entered into a short term loan agreement with China Everbright bank in China. The JV Company can borrow up to Chinese Renminbi (RMB) 50.0 million or $7.1 million based on the currency exchange rate between RMB and U.S. Dollar on September 23, 2019 at varying interest rates, with either RMB or USD. Interest payments with the entire principal is due no later than 90 days from each borrowing date. As of September 30, 2019, the outstanding balance under the loan was $0.8 million . On March 21, 2019, the JV Company entered into a one-year loan agreement with China Everbright Bank in China to provide a loan for RMB 20 million , or $3.0 million based on the currency exchange rate between RMB and U.S. Dollar on March 31, 2019 at a fixed interest rate of 5.44% per annum. Interest payments are due monthly with the entire principal due on March 21, 2020. As of September 30, 2019 , the outstanding balance under the loan was 20 million RMB (equivalent of $2.8 million based on the currency exchange rate as of September 30, 2019 ). On November 29 and December 4, 2018, the JV Company entered into two one-year loan agreements with China Merchant Bank in China to provide loans for RMB 80 million and 20 million , respectively, or $14.5 million in total based on the currency exchange rate between RMB and U.S. Dollar on December 31, 2018, at varying interest rates. Interest payments are due monthly and quarterly with the entire principal due not later than December 18 and December 5, 2019, respectively. As of September 30, 2019 , the outstanding balances under the loans were RMB 80 million and 20 million (equivalent to $14.0 million in total based on the currency exchange rate as of September 30, 2019 ). On November 16, 2018, the Company's subsidiary in China entered into a line of credit facility with Industrial and Commercial Bank of China, which expired on September 30, 2019. The purpose of the credit facility was to provide short-term borrowings. The Company could borrow up to approximately RMB 72.0 million or $10.3 million based on currency exchange rate between RMB and U.S. Dollar on November 16, 2018. As of September 30, 2019 , there was no outstanding balance under the line of credit. In October 2019, this line of credit was renewed with a maturity date of September 30, 2020. Accounts Receivable Factoring Agreement On August 9, 2019, one of the Company's wholly-owned subsidiaries ("the "Borrower") entered into a factoring agreement with the Hongkong and Shanghai Banking Corporation Limited (“HSBC”), whereby the Borrower assigns certain of its accounts receivable with recourse. This factoring agreement allows the Borrower to borrow up to 70% of the net amount of its eligible accounts receivable of the Borrower with a maximum amount of $30.0 million . The interest rate is based on one month LIBOR plus 1.75% per annum. This agreement, with certain financial covenants required, has no expiration date. The Company is the guarantor for this agreement. The Company is accounting for this transaction as a secured borrowing under the Transfers and Servicing of Financial Assets guidance. In addition, any cash held in the restricted bank account controlled by HSBC has a legal right of offset against the borrowing. The Borrower was in compliance with these covenants as of September 30, 2019 . As of September 30, 2019, the Company had an outstanding balance of $ 2.0 million with a 3.8% interest rate related to this secured borrowing and the Company had unused credit of approximately $28.0 million . Credit Facilities On May 9, 2018 (the “Effective Date”), the JV Company entered into a lease finance agreement and a security agreement (the “Agreements”) with YinHai Leasing Company and China Import/Export Bank (the “Lenders”). Pursuant to the Agreements, the Lenders agree to provide an aggregate of RMB 400.0 million , or $62.8 million based on the currency exchange rate between RMB and U.S. Dollar on the Effective Date, of financing to the JV Company (the “Lease Financing”). In exchange for the Lease Financing, the JV Company agrees to transfer title of its assembly and testing equipment to the Lenders, and the Lenders lease such equipment to the JV Company under a five -year lease arrangement, pursuant to which the JV Company makes quarterly lease payments to the Lenders consisting of principal and interest based on a repayment schedule mutually agreed by the parties. The interest under the Lease Financing is accrued based on the China Base Rate multiplied by 1.15 , or 5.4625% on the Effective Date. Under the Agreements, at the end of the five-year lease term, the Lenders agree to sell such equipment back to the JV Company for a nominal amount (RMB 1 ). The JV Company’s obligations under the Lease Financing are secured by the land and building owned by the JV Company (the “Collateral”). The proceeds from the Lease Financing will be used primarily for the acquisition and installation of the 12-inch fabrication equipment and other expenses of the JV Company relating to the completion of the fabrication facility located in Chongqing. The Agreements contain customary representation, warranties and covenants, including restrictions on the transfer of the Collateral. The Agreements also contain customary events of default, including but not limited to, failure to make payments and breach of material terms under the Agreements. The Agreements include certain customary closing conditions, including the payment of deposit by the JV Company. As of September 30, 2019 , the outstanding balance under the Agreement was 364.0 million RMB (equivalent of $51.1 million based on the currency exchange rate as of September 30, 2019 ), which was recorded under short-term and long-term finance lease liabilities. See future minimum lease payments table for finance lease liabilities in Note 6. Long-term debt On March 12, 2019, the JV Company entered into a loan agreement with The Export-Import Bank of China in the aggregate principal amount of 200 million RMB (approximately $29.8 million based on currency exchange rate between RMB and U.S. Dollar on March 31, 2019). The loan will mature on February 20, 2025. The JV Company drew down 190 million RMB (approximately $28.3 million based on the currency exchange rate between RMB and U.S. Dollar on March 31, 2019) in March 2019. The loan withdraw window will expire on February 28, 2020. The interest is accrued based on the China Base Rate multiplied by 1.1 , or 5.39% on March 12, 2019. The loan requires quarterly interest payments. The principal payments are required to be paid every 6 months over the term of loan commencing in October 2019. This loan is secured by the buildings and certain equipment owned by the JV Company. As a condition of the loan arrangements, 14 million RMB (approximately $2.0 million ) of cash is held as restricted cash by the JV Company as a compensating balance at the JV Company's bank until the principal is paid. As of September 30, 2019 , the outstanding balance of the loan was 190 million RMB (equivalent of $26.7 million based on the currency exchange rate as of September 30, 2019 ). On May 1, 2018, Jireh Semiconductor Incorporated ("Jireh"), a wholly-owned subsidiary of the Company, entered into a loan agreement with a financial institution (the "Bank") that provided a term loan in the amount of $17.8 million . The obligation under the loan agreement is secured by certain real estate assets of Jireh and guaranteed by the Company. The loan has a five-year term and matures on June 1, 2023. Beginning June 1, 2018, Jireh made consecutive monthly payments of principal and interest to the Bank. The outstanding principal shall accrue interest at a fixed rate of 5.04% per annum on the basis of a 360-day year. The loan agreement contains customary restrictive covenants and includes certain financial covenants that require the Company to maintain, on a consolidated basis, specified financial ratios. The Company was in compliance with these covenants as of September 30, 2019 . As of September 30, 2019 , the outstanding balance of the term loan was $16.6 million . On August 15, 2017, Jireh entered into a credit agreement with the Bank that provided a term loan in an amount up to $30.0 million for the purpose of purchasing certain equipment for the Company's fabrication facility located in Oregon. The obligation under the credit agreement is secured by substantially all assets of Jireh and guaranteed by the Company. The credit agreement has a five -year term and matures on August 15, 2022. In January 2018 and July 2018, Jireh drew down the loan in the amount of $13.2 million and $16.7 million , respectively. Beginning in October 2018, Jireh was required to pay to the Bank on each payment date, the outstanding principal amount of the loan in monthly installments. The loan accrues interest based on an adjusted London Interbank Offered Rate ("LIBOR") as defined in the credit agreement, plus a specified applicable margin in the range of 1.75% to 2.25% , based on the outstanding balance of the loan. The credit agreement contains customary restrictive covenants and includes certain financial covenants that require the Company to maintain, on a consolidated basis, specified financial ratios and fixed charge coverage ratio. The Company was in compliance with these covenants as of September 30, 2019 . As of September 30, 2019 , the outstanding balances of the term loan were $22.4 million . Maturities of short-term debt and long-term debt were as follows (in thousands): Year ending June 30, 2020 (Remaining) $ 26,735 2021 9,744 2022 14,798 2023 22,486 2024 6,458 Thereafter 5,055 Total principal of debt 85,276 Less: debt issuance costs (168 ) Total principal of debt, less debt issuance costs $ 85,108 Short-term Debt Long-term Debt Principal amount $ 28,820 $ 56,456 Less: debt issuance costs (69 ) (99 ) Total debt, less debt issuance costs $ 28,751 $ 56,357

Leases

Leases	3 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	Leases Under Topic 842, the Company evaluates contracts for lease accounting at contract inception and assesses lease classification at the lease commencement date. Operating leases are included in operating lease right-of-use ("ROU") assets, operating lease liabilities and operating lease liabilities - long-term on the Company's consolidated balance sheets. Finance leases are included in property, plant and equipment, finance lease liabilities and finance lease liabilities-long-term on the consolidated balance sheets. The Company recognizes an ROU asset and corresponding lease obligation liability at the lease commencement date where the lease obligation liability is measured at the present value of the minimum lease payments. As most of the leases do not provide an implicit rate, the Company uses its incremental borrowing rate at lease commencement. The Company uses an interest rate commensurate with the interest rate to borrow on a collateralized basis over a similar term with an amount equal to the lease payments. Operating leases are primarily related to offices, research and development facilities, sales and marketing facilities, and manufacturing facilities. In addition, long-term supply agreements to lease gas tank equipment and purchase industrial gases are accounted for as operating leases. Lease agreements frequently include renewal provisions and require the Company to pay real estate taxes, insurance and maintenance costs. For operating leases, the amortization of the ROU asset and the accretion of its lease obligation liability result in a single straight-line expense recognized over the lease term. The finance lease is related to the RMB 400.0 million of lease financing with YinHai Leasing Company and China Import/Export Bank in the JV Company. See Note 5 - Bank Borrowings for details. The Company does not record leases on the condensed consolidated balance sheet with a term of one year or less. The components of the Company’s operating and finance lease expenses are as follows for the period presented (in thousands): Three Months Ended September 30, 2019 Operating Leases : Fixed rent expense $ 1,281 Variable rent expense 207 Finance Lease: Amortization of equipment 1,093 Interest 740 Short-term leases Short-term lease expenses 75 Total lease expenses $ 3,396 Supplemental balance sheet information related to the Company’s operating and finance leases is as follows (in thousands, except lease term and discount rate): September 30, 2019 Operating Leases : ROU assets associated with operating leases $ 19,362 Finance Lease: Property, plant and equipment, gross 105,300 Accumulated depreciation (84,853 ) Property, plant and equipment, net 20,447 Weighted average remaining lease term (in years) Operating leases 9.63 Finance lease 3.47 Weighted average discount rate Operating leases 5.28 % Finance lease 5.46 % Supplemental cash flow information related to the Company’s operating and finance lease is as follows (in thousands): Three Months Ended September 30, 2019 Cash paid from amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,160 Operating cash flows from finance lease $ 740 Financing cash flows from finance lease $ 1,691 Future minimum lease payments are as follows as of September 30, 2019 (in thousands): Operating Leases Finance Leases The remainder of 2020 $ 3,714 $ 11,291 2021 3,162 17,165 2022 2,661 16,325 2023 2,323 11,834 2024 1,944 — 2025 1,445 — Thereafter 9,962 — Total minimum lease payments 25,211 56,615 Less amount representing interest (5,629 ) (5,511 ) Total lease liabilities $ 19,582 $ 51,104 Prior to the adoption of the new lease standard, future minimum lease payments as of June 30, 2019 were as follows (in thousands): Year ending June 30, Operating Leases Finance Leases 2020 $ 4,357 $ 14,219 2021 1,741 17,799 2022 1,164 16,928 2023 894 12,269 2024 1,002 — Thereafter 149 — Total minimum lease payments 9,307 61,215 Less amount representing interest — (6,479 ) Total lease liabilities $ 9,307 $ 54,736
Leases	Leases Under Topic 842, the Company evaluates contracts for lease accounting at contract inception and assesses lease classification at the lease commencement date. Operating leases are included in operating lease right-of-use ("ROU") assets, operating lease liabilities and operating lease liabilities - long-term on the Company's consolidated balance sheets. Finance leases are included in property, plant and equipment, finance lease liabilities and finance lease liabilities-long-term on the consolidated balance sheets. The Company recognizes an ROU asset and corresponding lease obligation liability at the lease commencement date where the lease obligation liability is measured at the present value of the minimum lease payments. As most of the leases do not provide an implicit rate, the Company uses its incremental borrowing rate at lease commencement. The Company uses an interest rate commensurate with the interest rate to borrow on a collateralized basis over a similar term with an amount equal to the lease payments. Operating leases are primarily related to offices, research and development facilities, sales and marketing facilities, and manufacturing facilities. In addition, long-term supply agreements to lease gas tank equipment and purchase industrial gases are accounted for as operating leases. Lease agreements frequently include renewal provisions and require the Company to pay real estate taxes, insurance and maintenance costs. For operating leases, the amortization of the ROU asset and the accretion of its lease obligation liability result in a single straight-line expense recognized over the lease term. The finance lease is related to the RMB 400.0 million of lease financing with YinHai Leasing Company and China Import/Export Bank in the JV Company. See Note 5 - Bank Borrowings for details. The Company does not record leases on the condensed consolidated balance sheet with a term of one year or less. The components of the Company’s operating and finance lease expenses are as follows for the period presented (in thousands): Three Months Ended September 30, 2019 Operating Leases : Fixed rent expense $ 1,281 Variable rent expense 207 Finance Lease: Amortization of equipment 1,093 Interest 740 Short-term leases Short-term lease expenses 75 Total lease expenses $ 3,396 Supplemental balance sheet information related to the Company’s operating and finance leases is as follows (in thousands, except lease term and discount rate): September 30, 2019 Operating Leases : ROU assets associated with operating leases $ 19,362 Finance Lease: Property, plant and equipment, gross 105,300 Accumulated depreciation (84,853 ) Property, plant and equipment, net 20,447 Weighted average remaining lease term (in years) Operating leases 9.63 Finance lease 3.47 Weighted average discount rate Operating leases 5.28 % Finance lease 5.46 % Supplemental cash flow information related to the Company’s operating and finance lease is as follows (in thousands): Three Months Ended September 30, 2019 Cash paid from amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,160 Operating cash flows from finance lease $ 740 Financing cash flows from finance lease $ 1,691 Future minimum lease payments are as follows as of September 30, 2019 (in thousands): Operating Leases Finance Leases The remainder of 2020 $ 3,714 $ 11,291 2021 3,162 17,165 2022 2,661 16,325 2023 2,323 11,834 2024 1,944 — 2025 1,445 — Thereafter 9,962 — Total minimum lease payments 25,211 56,615 Less amount representing interest (5,629 ) (5,511 ) Total lease liabilities $ 19,582 $ 51,104 Prior to the adoption of the new lease standard, future minimum lease payments as of June 30, 2019 were as follows (in thousands): Year ending June 30, Operating Leases Finance Leases 2020 $ 4,357 $ 14,219 2021 1,741 17,799 2022 1,164 16,928 2023 894 12,269 2024 1,002 — Thereafter 149 — Total minimum lease payments 9,307 61,215 Less amount representing interest — (6,479 ) Total lease liabilities $ 9,307 $ 54,736

Shareholders' Equity and Share-

Shareholders' Equity and Share-based Compensation	3 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Shareholders' Equity and Share-based Compensation	Shareholders' Equity and Share-based Compensation Share Repurchase In September 2017, the Board of Directors approved a new repurchase program (the “Repurchase Program”) that allowed the Company to repurchase its common shares from the open market pursuant to a pre-established Rule 10b5-1 trading plan or through privately negotiated transactions up to an aggregate of $30.0 million . The amount and timing of any repurchases under the Repurchase Program depend on a number of factors, including but not limited to, the trading price, volume, and availability of the Company's common shares. Shares repurchased under this program are accounted for as treasury shares and the total cost of shares repurchased is recorded as a reduction of shareholders' equity. From time to time, treasury shares may be reissued as part of the Company's stock-based compensation programs. Gains on re-issuance of treasury stock are credited to additional paid-in capital; losses are charged to additional paid-in capital to offset the net gains, if any, from previous sales or re-issuance of treasury stock. Any remaining balance of the losses is charged to retained earnings. During the three months ended September 30, 2019 , the Company did not repurchase any shares from the open market. Since the inception of the program, the Company repurchased an aggregate of 6,784,648 shares from the open market for a total cost of $67.3 million , at an average price of $9.92 per share, excluding fees and related expenses. No repurchased shares have been retired. Of the 6,784,648 repurchased shares, 140,328 shares with a weighted average repurchase price of $10.39 per share, were reissued at an average price of $5.50 per share pursuant to option exercises and vested restricted share units. As of September 30, 2019 , approximately $13.4 million remained available under the Repurchase Program. Time-based Restricted Stock Units ("TRSU") The following table summarizes the Company's TRSU activities for the three months ended September 30, 2019 : Number of Restricted Stock Units Weighted Average Grant Date Fair Value Per Share Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Nonvested at June 30, 2019 906,341 $ 14.09 1.62 $ 8,465,225 Granted 7,676 $ 11.72 Vested (41,691 ) $ 13.42 Forfeited (11,125 ) $ 14.66 Nonvested at September 30, 2019 861,201 $ 14.09 1.44 $ 10,575,548 Market-based Restricted Stock Units ("MSUs") During the quarter ended September 30, 2018, the Company granted 1.3 million market-based restricted stock units ("MSUs") to certain personnel. The number of shares to be earned at the end of performance period is determined based on the Company’s achievement of specified stock prices and revenue thresholds during the performance period from January 1, 2019 to December 31, 2021 as well as the recipients remaining in continuous service with the Company through such period. The MSUs vest in four equal annual installments after the end of each performance period. The Company estimated the grant date fair values of its MSUs with derived service periods of 4.5 to 7.5 years using a Monte-Carlo simulation model with the following assumptions: Risk-free interest rate of 2.7% , expected term of 3.5 years, expected volatility of 38.8% and dividend yield of 0% . The Company recorded approximately $0.2 million each of expense for these MSUs during the three months ended September 30, 2019 and 2018. Performance-based Restricted Stock Units ("PRSUs") In March 2017, 2018 and 2019, the Company granted 170,000 , 298,050 and 291,750 performance-based RSUs (“PRSUs”), respectively to certain personnel. The number of shares to be earned under the PRSUs is determined based on the level of attainment of predetermined financial goals. The PRSUs vest in four equal annual installments from the first anniversary date after the grant date if certain predetermined financial goals were met. The Company recorded approximately $0.2 million and $0.6 million of expenses for these PRSUs during the three months ended September 30, 2019 and 2018, respectively. The following table summarizes the Company's PRSUs activities for the three months ended September 30, 2019 : Number of Performance-based Restricted Stock Units Weighted Average Grant Date Fair Value Per Share Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Nonvested at June 30, 2019 596,724 $ 13.95 1.88 $ 5,573,402 Granted — $ — Vested — $ — Forfeited (3,625 ) $ 15.11 Nonvested at September 30, 2019 593,099 $ 13.94 1.62 $ 7,283,256 Stock Options The Company did not grant any stock options during the three months ended September 30, 2019 and 2018. The number of options expected to vest is the result of applying the pre-vesting forfeiture rate assumption to total outstanding options. The following table summarizes the Company's stock option activities for the three months ended September 30, 2019 : Weighted Weighted Average Average Remaining Number of Exercise Price Contractual Aggregate Shares Per Share Term (in years) Intrinsic Value Outstanding at June 30, 2019 876,478 $ 10.98 3.06 $ 758,871 Canceled or forfeited (5,000 ) $ 15.00 Outstanding at September 30, 2019 871,478 $ 10.96 2.83 $ 2,295,544 Options vested and expected to vest 871,478 $ 10.96 2.83 $ 2,295,544 Exercisable at September 30, 2019 871,478 $ 10.96 2.83 $ 2,295,544 Employee Share Purchase Plan ("ESPP") The assumptions used to estimate the fair values of common shares issued under the ESPP were as follows: Three Months Ended September 30, 2019 Volatility rate 40.7% Risk-free interest rate 2.2% - 2.4% Expected term 1.3 years Dividend yield 0% Share-based Compensation Expense T he total share-based compensation expense recognized in the condensed consolidated statements of operations for the periods presented was as follows: Three Months Ended September 30, 2019 2018 (in thousands) Cost of goods sold $ 436 $ 497 Research and development 524 632 Selling, general and administrative 1,409 2,000 $ 2,369 $ 3,129 As of September 30, 2019 , total unrecognized compensation cost under the Company's equity plans was $10.7 million , which is expected to be recognized over a weighted-average period of 2.0 years.

Income Taxes

Income Taxes	3 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recognized income tax expense of approximately $0.4 million and $0.6 million , for the three months ended September 30, 2019 and 2018, respectively. Excluding the discrete income tax items, the effective tax rate for the three months ended September 30, 2019 was (27.3)% compared to (159.8)% for the three months ended September 30, 2018. The changes in the effective tax rate and tax expense between the periods resulted primarily from changes in the mix of earnings in various geographic jurisdictions between the current year and the same period of last year. The Company files its income tax returns in the United States and in various foreign jurisdictions. The tax years 2001 to 2019 remain open to examination by U.S. federal and state tax authorities. The tax years 2012 to 2019 remain open to examination by foreign tax authorities. The Company's income tax returns are subject to examinations by the Internal Revenue Service and other tax authorities in various jurisdictions. In accordance with the guidance on the accounting for uncertainty in income taxes, the Company regularly assesses the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of its provision for income taxes. These assessments can require considerable estimates and judgments. As of September 30, 2019, the gross amount of unrecognized tax benefits was approximately $7.2 million , of which $4.3 million , if recognized, would reduce the effective income tax rate in future periods. If the Company's estimate of income tax liabilities proves to be less than the ultimate assessment, then a further charge to expense would be required. If events occur and the payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period when the Company determines the liabilities are no longer necessary. The Company does not anticipate any material changes to its uncertain tax positions during the next twelve months. On July 27, 2015, in Altera Corp. v. Commissioner, the U.S. Tax Court issued an opinion related to the treatment of stock-based compensation expense in an intercompany cost-sharing arrangement. In the July 2015 ruling, the Tax Court concluded that the sharing of the cost of employee stock compensation in a company’s cost-sharing arrangement was invalid under the U.S. Administrative Procedures Act. In June 2019, a panel of the Ninth Circuit of the U.S. Court of Appeals reversed this decision. In July 2019, Altera petitioned U.S. Court of Appeals for the Ninth Circuit to hold an en banc rehearing of the case. Due to the uncertainty surrounding the status of the current regulations and questions related to the scope of potential benefits, the Company has not recorded any benefit as of September 30, 2019. The Company will continue to monitor ongoing developments and potential impacts to its financial statements.

Segment and Geographic Informat

Segment and Geographic Information	3 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Segment and Geographic Information	Segment and Geographic Information The Company is organized as, and operates in, one operating segment: the design, development and supply of power semiconductor products for computing, consumer electronics, communication and industrial applications. The chief operating decision-maker is the Chief Executive Officer. The financial information presented to the Company's Chief Executive Officer is on a consolidated basis, accompanied by information about revenue by customer and geographic region, for purposes of evaluating financial performance and allocating resources. The Company has one business segment, and there are no segment managers who are held accountable for operations, operating results and plans for products or components below the consolidated unit level. Accordingly, the Company reports as a single operating segment. The Company sells its products primarily to distributors in the Asia Pacific region, who in turn sell these products to end customers. Because the Company's distributors sell their products to end customers which may have a global presence, revenue by geographical location is not necessarily representative of the geographical distribution of sales to end user markets. The revenue by geographical location in the following tables in based on the country or region in which the products were shipped to: Three Months Ended September 30, 2019 2018 (in thousands) Hong Kong $ 93,102 $ 91,591 China 16,512 20,397 South Korea 5,990 169 United States 1,101 1,973 Other countries 1,097 942 $ 117,802 $ 115,072 The following is a summary of revenue by product type: Three Months Ended September 30, 2019 2018 (in thousands) Power discrete $ 100,541 $ 92,255 Power IC 15,724 19,415 Packaging and testing services 1,537 3,402 $ 117,802 $ 115,072 Long-lived assets, net consisting of property, plant and equipment and land use rights, by geographical area are as follows: September 30, June 30, (in thousands) China $ 309,423 $ 321,145 United States 88,456 87,817 Other Countries 822 775 $ 398,701 $ 409,737

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Purchase Commitments As of September 30, 2019 and June 30, 2019 , the Company had approximately $52.9 million and $59.5 million , respectively, of outstanding purchase commitments primarily for purchases of semiconductor raw materials, wafers, spare parts and packaging and testing services, and approximately $28.6 million and $33.8 million , respectively, of capital commitments for the purchase of property and equipment and EPC construction. Other Commitments See Note 5 and Note 6 of the Notes to the Condensed Consolidated Financial Statements contained in this Quarterly Report on Form 10-Q for descriptions of commitments including bank borrowings and leases . Contingencies and Indemnities The Company is currently not a party to any pending material legal proceedings. The Company has in the past, and may from time to time in the future, become involved in legal proceedings arising from the normal course of business activities. The semiconductor industry is characterized by frequent claims and litigation, including claims regarding patent and other intellectual property rights as well as improper hiring practices. Irrespective of the validity of such claims, the Company could incur significant costs in the defense of such claims and suffer adverse effects on its operations. The Company is a party to a variety of agreements that it has contracted with various third parties. Pursuant to these agreements, the Company may be obligated to indemnify another party to such an agreement with respect to certain matters. Typically, these obligations arise in the context of contracts entered into by the Company, under which the Company customarily agrees to hold the other party harmless against losses arising from a breach of representations and covenants related to such matters as title to assets sold, certain intellectual property rights, specified environmental matters and certain income taxes. In these circumstances, payment by the Company is customarily conditioned on the other party making a claim pursuant to the procedures specified in the particular contract, which procedures typically allow the Company to challenge the other party's claim. Further, the Company's obligations under these agreements may be limited in time and/or amount, and in some instances, the Company may have recourse against third parties for certain payments made by it under these agreements. The Company has not historically paid or recorded any material indemnifications, and no accrual has been made at September 30, 2019 and June 30, 2019 . The Company has agreed to indemnify its directors and certain employees as permitted by law and pursuant to its Bye-laws, and has entered into indemnification agreements with its directors and executive officers. The Company has not recorded a liability associated with these indemnification arrangements, as it historically has not incurred any material costs associated with such indemnification obligations. Costs associated with such indemnification obligations may be mitigated by insurance coverage that the Company maintains. However, such insurance may not cover any, or may cover only a portion of, the amounts the Company may be required to pay. In addition, the Company may not be able to maintain such insurance coverage in the future.

Subsequent Events

Subsequent Events	3 Months Ended
	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In October 2019, the Company's subsidiary in China entered into a line of credit facility with Bank of Communications Limited in China. This line of credit matures on February 14, 2021 and is based on the China Base Rate multiplied by 1.05 , or 4.99% on October 31, 2019. The purpose the credit facility was to provide short-term borrowings. The Company could borrow up to approximately RMB 60.0 million or $8.5 million based on the currency exchange rate between the RMB and the U.S. Dollar on October 31, 2019. In October 2019, the Company’s expired line of credit with Industrial and Commercial Bank of China was renewed with a maturity date of September 30, 2020. In October 2019, the JV Company borrowed additional $1.6 million under the 50.0 million RMB agreement that was with China Everbright bank in China. Interest payments with this entire principal is due no later than January 13, 2020.

The Company and Significant A_2

The Company and Significant Accounting Policies (Policies)	3 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Preparation	Basis of Preparation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Article 10 of Securities and Exchange Commission Regulation S-X, as amended. They do not include all information and footnotes necessary for a fair presentation of financial position, results of operations and cash flows in conformity with U.S. GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2019 . All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the results of operations for the periods presented have been included in the interim periods. Operating results for the three months ended September 30, 2019 are not necessarily indicative of the results that may be expected for the fiscal year ending June 30, 2020 or any other interim period. The condensed consolidated balance sheet at June 30, 2019 is derived from the audited financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2019 .
Leases	Leases On July 1, 2019, the Company adopted Topic 842, Leases, using the modified retrospective method. Results for reporting periods beginning after July 1, 2019 were presented under Topic 842, while prior period amounts were not adjusted and continue to be reported in accordance with its historic accounting under Topic 840. The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use ("ROU") assets, current operating lease liabilities and long-term operating lease liabilities on the Company's condensed consolidated balance sheets. Finance leases are included in property, plant and equipment, finance lease liabilities and long-term finance leases liabilities on the condensed consolidated balance sheets. The Company elected the practical expedient permitted under the transition guidance, which allowed the Company to carryforward its historical lease classification, the Company's assessment on whether a contract was or contains a lease, and its initial direct costs for any leases that existed prior to July 1, 2019. The Company elected to combine its lease and non-lease components as a single lease component for all asset classes. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. The Company uses an estimate of its incremental borrowing rate based on the information available at the lease commencement date. The operating lease ROU assets also include any lease payments made and excludes lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise such options. Operating lease expense is generally recognized on a straight-line basis over the lease term. Variable lease payments are expensed as incurred and are not included within the operating lease ROU asset and lease liability calculation. The Company does not record leases on the condensed consolidated balance sheet with a term of one year or less. See Note 6 for further details.
Use of Estimates	Use of Estimates The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. To the extent there are material differences between these estimates and actual results, the Company's condensed consolidated financial statements will be affected. On an ongoing basis, the Company evaluates the estimates, judgments and assumptions including those related to stock rotation returns, price adjustments, allowance for doubtful accounts, inventory reserves, warranty accrual, income taxes, leases, share-based compensation, and useful lives for property, plant and equipment and intangible assets.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The fair value of cash equivalents is based on observable market prices and have been categorized in Level 1 in the fair value hierarchy. Cash equivalents consist primarily of short term bank deposits. The carrying values of financial instruments such as cash and cash equivalents, accounts receivable and accounts payable approximate their carrying values due to their short-term maturities. The carrying value of the company's debt is considered a reasonable estimate of fair value which is estimated by considering the current rates available to the Company for debt of the same remaining maturities, structure and terms of the debts.
Comprehensive Income (Loss)	Comprehensive Income (Loss) Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company's accumulated other comprehensive income (loss) consists of cumulative foreign currency translation adjustments. Total comprehensive income (loss) is presented in the condensed consolidated statements of comprehensive income (loss).
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Issued Accounting Standards not yet adopted In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2018-15 “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract ("ASU 2018-15”). These amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contact with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by these amendments. ASU 2018-15 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2019. Early adoption is permitted. The Company is currently assessing the impact that adoption of this guidance will have on its consolidated financial statements. In August 2018, the FASB issued Accounting Standard Updates ("ASU") ASU No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement ("ASU 2018-13”). ASU 2018-13 amends existing fair value measurement disclosure requirements by adding, changing, or removing certain disclosures. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. ASU No. 2018-13 is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2019. The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses ("ASU 2016-13"). This accounting standard update changes the accounting for recognizing impairments of financial assets. Under the update, credit losses for certain types of financial instruments will be estimated based on expected losses. The update also modifies the impairment models for available-for-sale debt securities and for purchased financial assets with credit deterioration since their origination. This update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently evaluating the impact of this accounting standard update on its Consolidated Financial Statements. Recently Adopted Accounting Standards In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). This guidance requires a dual approach for lessee accounting under which a lessee accounts for leases as finance leases or operating leases. Both finance and operating leases result in the lessee recognizing a right-of-use asset and a corresponding liability on its balance sheet, with differing methodology for income statement recognition. The Company adopted this standard as of July 1, 2019, using the modified retrospective transition method and recorded a cumulative-effect balance sheet adjustment. As a result of adopting ASU 2016-02 on July 1, 2019, the Company recognized operating lease right-of-use assets and corresponding operating lease liabilities of approximately $21 million each from existing leases on the Company's condensed consolidated balance sheet. See Note 6 for further details. In June 2018, the FASB issued ASU 2018-07, "Compensation -Stock Compensation: Improvement to Nonemployees Share-Based Payment Accounting ("ASU 2018-07"), which expands the scope of Topic 718 to include all share-based payment transactions for acquiring goods and services from nonemployees. ASU 2018-07 specifies that Topic 718 applies to all share-based payment transactions in which the grantor acquires goods and services to be used or consumed in its own operations by issuing share-based payment awards. ASU 2018-07 also clarifies that Topic 718 does not apply to share-based payments used to effectively provide (1) financing to the issuer or (2) awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under ASC 606. ASU 2018-07 had no material impact on the Company's consolidated financial statements.
Concentration of Credit Risk	The Company manages its credit risk associated with exposure to distributors and direct customers on outstanding accounts receivable through the application and review of credit approvals, credit ratings and other monitoring procedures. In some instances, the Company also obtains letters of credit from certain customers. Credit sales, which are mainly on credit terms of 30 to 60 days , are only made to customers who meet the Company's credit requirements, while sales to new customers or customers with low credit ratings are usually made on an advance payment basis. The Company considers its trade accounts receivable to be of good credit quality because its key distributors and direct customers have long-standing business relationships with the Company and the Company has not experienced any significant write-offs of accounts receivable in the past. The Company closely monitors the aging of accounts receivable from its distributors and direct customers, and regularly reviews their financial positions, when available.

Net Income Per Common Share A_2

Net Income Per Common Share Attributable to Alpha and Omega Semiconductor Limited - (Tables)	3 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the calculation of basic and diluted net income per share attributable to common shareholders: Three Months Ended September 30, 2019 2018 (in thousands, except per share data) Numerator: Net income attributable to Alpha and Omega Semiconductor Limited $ 1,009 $ 2,416 Denominator: Basic: Weighted average number of common shares used to compute basic net income per share 24,538 23,844 Diluted: Weighted average number of common shares used to compute basic net income per share 24,538 23,844 Effect of potentially dilutive securities: Stock options, RSUs and ESPP shares 592 750 Weighted average number of common shares used to compute diluted net income per share 25,130 24,594 Net income per share attributable to Alpha and Omega Semiconductor Limited: Basic $ 0.04 $ 0.10 Diluted $ 0.04 $ 0.10
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following potential dilutive securities were excluded from the computation of diluted net income per share as their effect would have been anti-dilutive: Three Months Ended September 30, 2019 2018 (in thousands) Employee stock options and RSUs 338 405 ESPP 961 216 Total potential dilutive securities 1,299 621

Concentration of Credit Risk _2

Concentration of Credit Risk and Significant Customers (Tables)	3 Months Ended
	Sep. 30, 2019
Risks and Uncertainties [Abstract]
Schedules of Concentration of Risk, by Risk Factor	Summarized below are individual customers whose revenue or accounts receivable balances were more than 10% of the respective total consolidated amounts: Three Months Ended September 30, Percentage of revenue 2019 2018 Customer A 28.8 % 27.7 % Customer B 35.1 % 38.0 % September 30, June 30, Percentage of accounts receivable Customer A 36.9 % 12.1 % Customer B 25.9 % 19.7 % Customer C 10.3 % 18.1 % Customer D * 13.3 % * Less than 10%

Balance Sheet Components (Table

Balance Sheet Components (Tables)	3 Months Ended
	Sep. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	Accounts receivable, net: September 30, June 30, (in thousands) Accounts receivable $ 62,969 $ 48,401 Less: Allowance for price adjustments (23,610 ) (24,075 ) Less: Allowance for doubtful accounts (30 ) (30 ) Accounts receivable, net $ 39,329 $ 24,296
Schedule of Inventory, Current	Inventories: September 30, June 30, (in thousands) Raw materials $ 61,627 $ 59,076 Work in-process 44,231 38,214 Finished goods 12,700 14,353 $ 118,558 $ 111,643
Other Current Assets	Other current assets: September 30, June 30, (in thousands) VAT receivable $ 27,719 $ 30,769 Other prepaid expenses 2,147 2,745 Prepaid insurance 1,192 939 Prepaid maintenance 940 481 Prepayment to supplier 613 583 Prepaid income tax 286 267 Customs deposit 174 114 Lease financing cost — 825 Other receivable 21 379 $ 33,092 $ 37,102
Property, Plant and Equipment	operty, plant and equipment, net: September 30, June 30, (in thousands) Land $ 4,877 $ 4,877 Building 58,333 36,205 Manufacturing machinery and facility equipment 420,317 303,750 Equipment and tooling 21,900 20,739 Computer equipment and software 37,755 34,048 Office furniture and equipment 3,307 3,243 Leasehold improvements 66,296 53,597 Land use rights 8,448 8,760 621,233 465,219 Less: accumulated depreciation (259,544 ) (252,982 ) 361,689 212,237 Equipment and construction in progress 42,316 197,500 Property, plant and equipment, net $ 404,005 $ 409,737
Intangible Assets Disclosure	Intangible assets, net: September 30, June 30, (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 (2,870 ) (2,842 ) 16,585 16,613 Goodwill 269 269 Intangible assets, net $ 16,854 $ 16,882
Schedule of Other Assets, Noncurrent	Other long-term assets: September 30, June 30, (in thousands) Prepayments for property and equipment $ 3,927 $ 4,846 Investment in a privately held company 700 700 Lease financing costs — 1,758 Customs deposit 977 980 Other long-term deposits 1,558 889 Office leases deposits 1,047 1,031 Other 307 413 $ 8,516 $ 10,617
Schedule of Accrued Liabilities	Accrued liabilities: September 30, June 30, (in thousands) Accrued compensation and benefits $ 16,410 $ 16,385 Warranty accrual 641 623 Stock rotation accrual 2,617 1,921 Accrued professional fees 1,983 1,721 Accrued inventory 1,628 857 Accrued facilities related expenses 2,068 4,233 Accrued financing lease costs 702 728 Accrued property, plant and equipment 11,499 11,527 ESPP payable 1,875 585 Customer deposit 2,645 351 Other accrued expenses 7,329 5,144 $ 49,397 $ 44,075
Schedule of Product Warranty Liability	The activities in the warranty accrual, included in accrued liabilities, are as follows: Three Months Ended September 30, 2019 2018 (in thousands) Beginning balance $ 623 $ 535 Additions 21 136 Utilization (3 ) (39 ) Ending balance $ 641 $ 632
Stock Rotation Accrual	The activities in the stock rotation accrual, included in accrued liabilities, are as follows: Three Months Ended September 30, 2019 2018 (in thousands) Beginning balance $ 1,921 $ 1,750 Additions 2,565 748 Utilization (1,869 ) (723 ) Ending balance $ 2,617 $ 1,775
Other Long-Term Liabilities	Other long-term liabilities: September 30, June 30, (in thousands) Customer deposits $ 8,000 * $ 10,000 * Computer software liabilities 3,258 3,701 Other — 220 Other long-term liabilities $ 11,258 $ 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 quarter ended September 30, 2019 since the repayment of this amount is due within a year.

Bank Borrowing (Tables)

Bank Borrowing (Tables)	3 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Schedule of Maturities	Maturities of short-term debt and long-term debt were as follows (in thousands): Year ending June 30, 2020 (Remaining) $ 26,735 2021 9,744 2022 14,798 2023 22,486 2024 6,458 Thereafter 5,055 Total principal of debt 85,276 Less: debt issuance costs (168 ) Total principal of debt, less debt issuance costs $ 85,108 Short-term Debt Long-term Debt Principal amount $ 28,820 $ 56,456 Less: debt issuance costs (69 ) (99 ) Total debt, less debt issuance costs $ 28,751 $ 56,357

Leases - (Tables)

Leases - (Tables)	3 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Components of Operating and Finance Lease Costs	The components of the Company’s operating and finance lease expenses are as follows for the period presented (in thousands): Three Months Ended September 30, 2019 Operating Leases : Fixed rent expense $ 1,281 Variable rent expense 207 Finance Lease: Amortization of equipment 1,093 Interest 740 Short-term leases Short-term lease expenses 75 Total lease expenses $ 3,396 Supplemental cash flow information related to the Company’s operating and finance lease is as follows (in thousands): Three Months Ended September 30, 2019 Cash paid from amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,160 Operating cash flows from finance lease $ 740 Financing cash flows from finance lease $ 1,691
Schedule of Lease Assets and Liabilities	Supplemental balance sheet information related to the Company’s operating and finance leases is as follows (in thousands, except lease term and discount rate): September 30, 2019 Operating Leases : ROU assets associated with operating leases $ 19,362 Finance Lease: Property, plant and equipment, gross 105,300 Accumulated depreciation (84,853 ) Property, plant and equipment, net 20,447 Weighted average remaining lease term (in years) Operating leases 9.63 Finance lease 3.47 Weighted average discount rate Operating leases 5.28 % Finance lease 5.46 %
Schedule of Operating Lease Future Minimum Lease Payments (Topic 842)	Future minimum lease payments are as follows as of September 30, 2019 (in thousands): Operating Leases Finance Leases The remainder of 2020 $ 3,714 $ 11,291 2021 3,162 17,165 2022 2,661 16,325 2023 2,323 11,834 2024 1,944 — 2025 1,445 — Thereafter 9,962 — Total minimum lease payments 25,211 56,615 Less amount representing interest (5,629 ) (5,511 ) Total lease liabilities $ 19,582 $ 51,104
Schedule of Finance Lease Future Minimum Lease Payments (Topic 842)	Future minimum lease payments are as follows as of September 30, 2019 (in thousands): Operating Leases Finance Leases The remainder of 2020 $ 3,714 $ 11,291 2021 3,162 17,165 2022 2,661 16,325 2023 2,323 11,834 2024 1,944 — 2025 1,445 — Thereafter 9,962 — Total minimum lease payments 25,211 56,615 Less amount representing interest (5,629 ) (5,511 ) Total lease liabilities $ 19,582 $ 51,104
Schedule of Future Minimum Rental Payments for Operating Leases (Topic 840)	Prior to the adoption of the new lease standard, future minimum lease payments as of June 30, 2019 were as follows (in thousands): Year ending June 30, Operating Leases Finance Leases 2020 $ 4,357 $ 14,219 2021 1,741 17,799 2022 1,164 16,928 2023 894 12,269 2024 1,002 — Thereafter 149 — Total minimum lease payments 9,307 61,215 Less amount representing interest — (6,479 ) Total lease liabilities $ 9,307 $ 54,736
Schedule of Future Minimum Lease Payments for Capital Leases (Topic 840)	Prior to the adoption of the new lease standard, future minimum lease payments as of June 30, 2019 were as follows (in thousands): Year ending June 30, Operating Leases Finance Leases 2020 $ 4,357 $ 14,219 2021 1,741 17,799 2022 1,164 16,928 2023 894 12,269 2024 1,002 — Thereafter 149 — Total minimum lease payments 9,307 61,215 Less amount representing interest — (6,479 ) Total lease liabilities $ 9,307 $ 54,736

Shareholders' Equity and Shar_2

Shareholders' Equity and Share-based Compensation (Tables)	3 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Restricted Stock Units Activity	Time-based Restricted Stock Units ("TRSU") The following table summarizes the Company's TRSU activities for the three months ended September 30, 2019 : Number of Restricted Stock Units Weighted Average Grant Date Fair Value Per Share Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Nonvested at June 30, 2019 906,341 $ 14.09 1.62 $ 8,465,225 Granted 7,676 $ 11.72 Vested (41,691 ) $ 13.42 Forfeited (11,125 ) $ 14.66 Nonvested at September 30, 2019 861,201 $ 14.09 1.44 $ 10,575,548 The following table summarizes the Company's PRSUs activities for the three months ended September 30, 2019 : Number of Performance-based Restricted Stock Units Weighted Average Grant Date Fair Value Per Share Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Nonvested at June 30, 2019 596,724 $ 13.95 1.88 $ 5,573,402 Granted — $ — Vested — $ — Forfeited (3,625 ) $ 15.11 Nonvested at September 30, 2019 593,099 $ 13.94 1.62 $ 7,283,256
Summary of Stock Option Activities	The following table summarizes the Company's stock option activities for the three months ended September 30, 2019 : Weighted Weighted Average Average Remaining Number of Exercise Price Contractual Aggregate Shares Per Share Term (in years) Intrinsic Value Outstanding at June 30, 2019 876,478 $ 10.98 3.06 $ 758,871 Canceled or forfeited (5,000 ) $ 15.00 Outstanding at September 30, 2019 871,478 $ 10.96 2.83 $ 2,295,544 Options vested and expected to vest 871,478 $ 10.96 2.83 $ 2,295,544 Exercisable at September 30, 2019 871,478 $ 10.96 2.83 $ 2,295,544
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	The assumptions used to estimate the fair values of common shares issued under the ESPP were as follows: Three Months Ended September 30, 2019 Volatility rate 40.7% Risk-free interest rate 2.2% - 2.4% Expected term 1.3 years Dividend yield 0%
Share-based Compensation, Allocation of Recognized Period Costs	Share-based Compensation Expense T he total share-based compensation expense recognized in the condensed consolidated statements of operations for the periods presented was as follows: Three Months Ended September 30, 2019 2018 (in thousands) Cost of goods sold $ 436 $ 497 Research and development 524 632 Selling, general and administrative 1,409 2,000 $ 2,369 $ 3,129

Segment and Geographic Inform_2

Segment and Geographic Information (Tables)	3 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Disaggregation of Revenue [Table Text Block]	The Company sells its products primarily to distributors in the Asia Pacific region, who in turn sell these products to end customers. Because the Company's distributors sell their products to end customers which may have a global presence, revenue by geographical location is not necessarily representative of the geographical distribution of sales to end user markets. The revenue by geographical location in the following tables in based on the country or region in which the products were shipped to: Three Months Ended September 30, 2019 2018 (in thousands) Hong Kong $ 93,102 $ 91,591 China 16,512 20,397 South Korea 5,990 169 United States 1,101 1,973 Other countries 1,097 942 $ 117,802 $ 115,072 The following is a summary of revenue by product type: Three Months Ended September 30, 2019 2018 (in thousands) Power discrete $ 100,541 $ 92,255 Power IC 15,724 19,415 Packaging and testing services 1,537 3,402 $ 117,802 $ 115,072
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	Long-lived assets, net consisting of property, plant and equipment and land use rights, by geographical area are as follows: September 30, June 30, (in thousands) China $ 309,423 $ 321,145 United States 88,456 87,817 Other Countries 822 775 $ 398,701 $ 409,737

The Company and Significant A_3

The Company and Significant Accounting Policies - Basis of Preparation (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Property and equipment purchased but not yet paid	$ 8,334	$ 22,539
Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Property and equipment purchased but not yet paid		(34,700)
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Property and equipment purchased but not yet paid		$ 57,200

The Company and Significant A_4

The Company and Significant Accounting Policies - Joint Venture (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jul. 01, 2019
Operating lease right-of-use assets, net	$ 19,362
Operating lease liability	$ 19,582
Parent Company | Facility in Liangjiang New Area of Chongqing (the 'Joint Venture')
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	51.00%
Chongqing Funds | Facility in Liangjiang New Area of Chongqing (the 'Joint Venture')
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	49.00%
ASU 2016-02
Operating lease right-of-use assets, net		$ 21,000
Operating lease liability		$ 21,000

Net Income Per Common Share A_3

Net Income Per Common Share Attributable to Alpha and Omega Semiconductor Limited - Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income attributable to Alpha and Omega Semiconductor Limited	$ 1,009	$ 2,416
Basic:
Weighted average number of common shares used to compute basic net income per share	24,538	23,844
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	592	750
Weighted average number of common shares used to compute diluted net income per share	25,130	24,594
Net income per share attributable to Alpha and Omega Semiconductor Limited:
Basic (in dollars per share)	$ 0.04	$ 0.10
Diluted (in dollars per share)	$ 0.04	$ 0.10

Net Income Per Common Share A_4

Net Income Per Common Share Attributable to Alpha and Omega Semiconductor Limited - Potential Dilutive Shares (Details) - shares shares in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	1,299	621
Employee stock options and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	338	405
ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	961	216

Concentration of Credit Risk _3

Concentration of Credit Risk and Significant Customers - (Details)	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018
Minimum
Concentration Risk
Terms of credit sales, (in days)	30 days
Maximum
Concentration Risk
Terms of credit sales, (in days)	60 days
Customer A | Revenue | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	28.80%		27.70%
Customer A | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	36.90%	12.10%
Customer B | Revenue | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	35.10%		38.00%
Customer B | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	25.90%	19.70%
Customer C | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	10.30%	18.10%
Customer D [Member] | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		13.30%

Balance Sheet Components - Acco

Balance Sheet Components - Accounts receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Accounts receivable	$ 62,969	$ 48,401
Less: Allowance for price adjustments	(23,610)	(24,075)
Less: Allowance for doubtful accounts	(30)	(30)
Accounts receivable, net	$ 39,329	$ 24,296

Balance Sheet Components - Inve

Balance Sheet Components - Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Raw materials	$ 61,627	$ 59,076
Work in-process	44,231	38,214
Finished goods	12,700	14,353
Inventory, net	$ 118,558	$ 111,643

Balance Sheet Components - Othe

Balance Sheet Components - Other current assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
VAT receivable	$ 27,719	$ 30,769
Other prepaid expenses	2,147	2,745
Prepaid Insurance	1,192	939
Prepaid Maintenance, Current	940	481
Prepayment to supplier	613	583
Prepaid income tax	286	267
Customs deposit	174	114
Lease Financing Costs, Current	0	825
Other receivable	21	379
Other Assets, Current	$ 33,092	$ 37,102

Balance Sheet Components - Prop

Balance Sheet Components - Property, plant, and equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	$ 621,233	$ 465,219
Land use rights	8,448	8,760
Less: accumulated depreciation	(259,544)	(252,982)
Property, plant and equipment excluding equipment and construction in progress, net	361,689	212,237
Equipment and construction in progress	42,316	197,500
Property, plant and equipment, net	404,005	409,737
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	4,877	4,877
Building
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	58,333	36,205
Manufacturing machinery and facility equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	420,317	303,750
Equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	21,900	20,739
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	37,755	34,048
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	3,307	3,243
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	$ 66,296	$ 53,597

Balance Sheet Components - Inta

Balance Sheet Components - Intangible assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 19,455	$ 19,455
Less: accumulated amortization	(2,870)	(2,842)
Intangible Assets, Net (Excluding Goodwill)	16,585	16,613
Goodwill	269	269
Intangible assets, net	16,854	16,882
Patents and technology rights
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	18,037	18,037
Trade name
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	268	268
Customer relationships
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,150	$ 1,150

Balance Sheet Components - In_2

Balance Sheet Components - Intangible Assets, Additional Information (Details) $ in Millions	Sep. 30, 2019USD ($)
STMicro | License fees
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 16.2

Balance Sheet Components - Ot_2

Balance Sheet Components - Other long term assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Prepayments for property and equipment	$ 3,927	$ 4,846
Investment in a privately held company	700	700
Lease financing costs, noncurrent	0	1,758
Custom deposit, noncurrent	977	980
Other long-term deposits	1,558	889
Office lease deposit, noncurrent	1,047	1,031
Other	307	413
Other long-term assets	$ 8,516	$ 10,617

Balance Sheet Components - Accr

Balance Sheet Components - Accrued liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]
Accrued compensation and benefits	$ 16,410	$ 16,385
Warranty accrual	641	623	$ 632	$ 535
Stock rotation accrual	2,617	1,921	$ 1,775	$ 1,750
Accrued professional fees	1,983	1,721
Accrued inventory	1,628	857
Accrued facilities related expenses	2,068	4,233
Accrued financing lease costs	702	728
Accrued property, plant and equipment	11,499	11,527
ESPP payable	1,875	585
Customer deposit	2,645	351
Other accrued expenses	7,329	5,144
Accrued liabilities	$ 49,397	$ 44,075

Balance Sheet Components - Prod

Balance Sheet Components - Product Warranty Accrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Beginning balance	$ 623	$ 535
Additions	21	136
Utilization	(3)	(39)
Ending balance	$ 641	$ 632

Balance Sheet Components - Stoc

Balance Sheet Components - Stock Rotation Accrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Stock Rotation Accrual Increae (Decrease) [Roll Forward]
Beginning balance	$ 1,921	$ 1,750
Additions	2,565	748
Utilization	(1,869)	(723)
Ending balance	$ 2,617	$ 1,775

Balance Sheet Components - Ot_3

Balance Sheet Components - Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Customer deposits	$ 8,000	$ 10,000
Computer software liabilities	3,258	3,701
Other	0	220
Other long-term liabilities	$ 11,258	$ 13,921

Balance Sheet Components - Ot_4

Balance Sheet Components - Other Long-Term Liabilities Reclassification (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Schedule Of Long-Term Liabilities [Line Items]
Customer deposits	$ (8,000)	$ (10,000)
Accrued liabilities	49,397	$ 44,075
Customer A And Customer B
Schedule Of Long-Term Liabilities [Line Items]
Customer deposits	(2,000)
Accrued liabilities	$ 2,000

Bank Borrowing (Details)

Bank Borrowing (Details)

Sep. 30, 2019CNY (¥)

Sep. 30, 2019USD ($)

Aug. 09, 2019USD ($)

Mar. 12, 2019CNY (¥)

May 09, 2018CNY (¥)

Aug. 15, 2017USD ($)

Mar. 31, 2019CNY (¥)

Mar. 31, 2019USD ($)

Jul. 31, 2018USD ($)

Jan. 31, 2018USD ($)

Sep. 30, 2019USD ($)

Sep. 23, 2019CNY (¥)

Sep. 23, 2019USD ($)

Jun. 30, 2019USD ($)

Mar. 21, 2019CNY (¥)Rate

Mar. 12, 2019USD ($)

Dec. 31, 2018USD ($)

Dec. 04, 2018CNY (¥)

Nov. 29, 2018CNY (¥)

Nov. 16, 2018CNY (¥)

Nov. 16, 2018USD ($)

May 09, 2018USD ($)

May 01, 2018USD ($)

Maturities of debt

2020 (Remaining)

$ 26,735,000

2020

9,744,000

2021

14,798,000

2022

22,486,000

2023

6,458,000

Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five

5,055,000

Total principal of debt

85,276,000

Less: debt issuance costs

(168,000)

Total principal of debt, less debt issuance costs

85,108,000

Long-term Debt, Current Maturities

28,751,000

$ 26,609,000

Long-term Debt, Excluding Current Maturities

56,357,000

$ 59,380,000

Long-term Debt, Current Maturities, And Short-Term Debt, Gross

28,820,000

Long-term Debt, Excluding Current Maturities, Gross

56,456,000

Debt Issuance Costs, Gross, Current

(69,000)

Debt Issuance Cost, Gross, Noncurrent

(99,000)

Long-term Debt, Current Maturities, And Short-term Debt

28,751,000

Loan Agreement November 29 2018

Debt Instrument [Line Items]

Debt instrument, face amount | ¥

¥ 80,000,000

Loan agreements, short-term debt | ¥

¥ 80,000,000

Loan Agreement December 4 2018

Debt Instrument [Line Items]

Debt instrument, face amount | ¥

¥ 20,000,000

Loan agreements, short-term debt | ¥

20,000,000

Loan Agreements November 29 And December 4 2018

Debt Instrument [Line Items]

Debt instrument, face amount

$ 14,500,000

Loan agreements, short-term debt

14,000,000

Secured Debt | Accounts Receivable Factoring Agreement August 9 2019

Debt Instrument [Line Items]

Accounts receivable factoring agreement, maximum borrowing capacity, percent of net accounts receivable

70.00%

Accounts receivable factoring agreement, maximum borrowing capacity

$ 30,000,000

Accounts receivable factoring agreement, remaining borrowing capacity

28,000,000

Basis spread on variable rate

1.75%

Accounts receivable factoring agreement, borrowed amount outstanding

2,000,000

Debt Instrument, Interest Rate, Effective Percentage

3.80%

Secured Debt

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

$ 17,800,000

Amount outstanding

16,600,000

Stated percentage

5.04%

Term Loan | Secured Debt | Variable Interest Rate Term Loan Maturing August 2022

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

$ 30,000,000

Debt instrument, term

5 years

5 years

Amount outstanding

22,400,000

Proceeds from lines of credit

$ 16,700,000

$ 13,200,000

Minimum | London Interbank Offered Rate (LIBOR) | Term Loan | Secured Debt | Variable Interest Rate Term Loan Maturing August 2022

Debt Instrument [Line Items]

Basis spread on variable rate

1.75%

Maximum | London Interbank Offered Rate (LIBOR) | Term Loan | Secured Debt | Variable Interest Rate Term Loan Maturing August 2022

Debt Instrument [Line Items]

Basis spread on variable rate

2.25%

YinHai Leasing Company and China Import/Export Bank | Lease Financing

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

¥ 400,000,000

$ 62,800,000

Nominal sale amount at end of lease term | ¥

¥ 1

Amount outstanding

364,000,000

51,100,000

Export-Import Bank Of China

Debt Instrument [Line Items]

Restricted cash

¥ 14,000,000

$ 2,000,000

Line of credit facility outstanding balance

190,000,000

$ 26,700,000

Export-Import Bank Of China | Secured Debt

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

¥ 200,000,000

$ 29,800,000

Proceeds from lines of credit

¥ 190,000,000

$ 28,300,000

Maturities of debt

Line Of Credit Facility, Interest Rate During Period, China Base Rate Multiplier

1.1

Line of Credit Facility, Interest Rate During Period

5.39%

China | YinHai Leasing Company and China Import/Export Bank | Base Rate | Lease Financing

Debt Instrument [Line Items]

Basis spread on variable rate, multiple

1.15

1.15

Basis spread on variable rate

5.4625%

Foreign Line of Credit | Loan Agreement September 23 2019

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

¥ 50,000,000

$ 7,100,000

Loan agreements, short-term debt

800,000

Foreign Line of Credit | Industrial And Commercial Bank of China

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

¥ 72,000,000

$ 10,300,000

Loan agreements, short-term debt

0

Loans Payable | Loan Agreement March 21 2019

Debt Instrument [Line Items]

Debt instrument, face amount

$ 3,000,000

¥ 20,000,000

Loan agreements, short-term debt

¥ 20,000,000

$ 2,800,000

Short-term debt, fixed interest rate | Rate

5.44%

Leases - Narrative (Details)

Leases - Narrative (Details) - May 09, 2018 ¥ in Millions, $ in Millions	CNY (¥)	USD ($)
Lease Financing | YinHai Leasing Company and China Import/Export Bank
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	¥ 400	$ 62.8

Leases - Schedule of Operating

Leases - Schedule of Operating and Finance Lease Expenses (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2019USD ($)
Operating Leases:
Fixed rent expense	$ 1,281
Variable rent expense	207
Finance Lease:
Amortization of equipment	1,093
Interest	740
Short-term leases
Short-term lease expenses	75
Total lease expenses	$ 3,396

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information (Details) $ in Thousands	Sep. 30, 2019USD ($)
Operating Leases:
ROU assets associated with operating leases	$ 19,362
Finance Lease:
Property, plant and equipment, gross	105,300
Accumulated depreciation	(84,853)
Property, plant and equipment, net	$ 20,447
Weighted average remaining lease term (in years)
Operating leases	9 years 7 months 17 days
Finance lease	3 years 5 months 18 days
Weighted average discount rate
Operating leases	5.28%
Finance lease	5.46%

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2019USD ($)
Cash paid from amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 1,160
Operating cash flows from finance lease	740
Financing cash flows from finance lease	$ 1,691

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments (Topic 842) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Operating Leases
The remaining of 2020	$ 3,714
2021	3,162
2022	2,661
2023	2,323
2024	1,944
2025	1,445
Thereafter	9,962
Total minimum lease payments	25,211
Less amount representing interest	(5,629)
Total lease liabilities	$ 19,582
Finance Leases
The remaining of 2020		$ 11,291
2021		17,165
2022		16,325
2023		11,834
2024		0
2025		0
Thereafter		0
Total minimum lease payments		56,615
Less amount representing interest		(5,511)
Total lease liabilities		$ 51,104

Leases - Future Minimum Lease_2

Leases - Future Minimum Lease Payments (Topic 840) (Details) $ in Thousands	Jun. 30, 2019USD ($)
Leases, Operating [Abstract]
2020	$ 4,357
2021	1,741
2022	1,164
2023	894
2024	1,002
Thereafter	149
Total lease liabilities	9,307
Leases, Capital [Abstract]
2020	14,219
2021	17,799
2022	16,928
2023	12,269
2024	0
Thereafter	0
Total minimum lease payments	61,215
Less amount representing interest	(6,479)
Total lease liabilities	$ 54,736

Shareholders' Equity and Shar_3

Shareholders' Equity and Share-based Compensation - Shares Repurchase (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		107 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Class of Stock [Line Items]
Treasury Stock, Shares, Retired	0
Share repurchase program, authorized amount (USD in Millions)	$ 30,000		$ 30,000
Repurchase of common shares under shares repurchase program	0		6,784,648
Treasury stock acquired, average price per share (in dollars per share)			$ 9.92
Repurchase of common shares under shares repurchase program		$ (1,501)	$ (67,300)
Shares repurchase program, remaining balance	$ 13,400		$ 13,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0
Share-based Payment Arrangement, Expense	$ 2,369	$ 3,129
Treasury Stock Reissued
Class of Stock [Line Items]
Treasury stock acquired, average price per share (in dollars per share)			$ 10.39
Shares reissued (in shares)			140,328
Shares reissued, average price (in dollars per share)			$ 5.50
Market-based Restricted Stock Units (MSU) [Member]
Class of Stock [Line Items]
Share-based Payment Arrangement, Expense	$ 200	$ 200

Shareholders' Equity and Shar_4

Shareholders' Equity and Share-based Compensation - Time-based Restricted Stock Activity (Details) - USD ($)	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average remaining recognition period (in years)	2 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at June 30, 2018 (in shares)	906,341
Granted (in shares)	7,676
Vested (in shares)	(41,691)
Forfeited (in shares)	(11,125)
Nonvested at March 31, 2019 (in shares)	861,201	906,341
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested at June 30, 2018 (in dollars per share)	$ 14.09
Granted (in dollars per share)	11.72
Vested (in dollars per share)	13.42
Forfeited (in dollars per share)	14.66
Nonvested at March 31, 2019 (in dollars per share	$ 14.09	$ 14.09
Weighted average remaining recognition period (in years)	1 year 5 months 9 days	1 year 7 months 13 days
Aggregate Intrinsic Value	$ 10,575,548	$ 8,465,225

Shareholders' Equity and Shar_5

Shareholders' Equity and Share-based Compensation - Market-based Restricted Stock Units Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 2,369	$ 3,129
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average remaining recognition period (in years)	2 years
Market-based Restricted Stock Units (MSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.70%
Expected term	3 years 6 months
Expected volatility	38.80%
Dividend yield	0.00%
Share-based Payment Arrangement, Expense	$ 200	$ 200
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)		1,310,000
Market-based Restricted Stock Units (MSU) [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award service period	4 years 6 months
Market-based Restricted Stock Units (MSU) [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award service period	7 years 6 months

Shareholders' Equity and Shar_6

Shareholders' Equity and Share-based Compensation - Performance-based Restricted Stock Units (Details) - USD ($)	1 Months Ended			3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense				$ 2,369,000		$ 3,129,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average remaining recognition period (in years)				2 years
Performance Based Restricted Stock Units (PRSUs) Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense				$ 200,000		$ 600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at June 30, 2018 (in shares)				596,724
Granted (in shares)	291,750	298,050	170,000	0
Vested (in shares)				0
Forfeited (in shares)				(3,625)
Nonvested at March 31, 2019 (in shares)				593,099	596,724
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested at June 30, 2018 (in dollars per share)				$ 13.95
Granted (in dollars per share)				0
Vested (in dollars per share)				0
Forfeited (in dollars per share)				15.11
Nonvested at March 31, 2019 (in dollars per share				$ 13.94	$ 13.95
Weighted average remaining recognition period (in years)				1 year 7 months 13 days	1 year 10 months 17 days
Aggregate Intrinsic Value				$ 7,283,256	$ 5,573,402

Shareholders' Equity and Shar_7

Shareholders' Equity and Share-based Compensation - Stock Options Outstanding and Exercisable (Details) - USD ($)	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 15
Options, Number Outstanding (in shares)	871,478	876,478
Options, Weighted-Average Remaining Contractual Life (in years)	2 years 9 months 29 days	3 years 22 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 2,295,544	$ 758,871
Options, Weighted-Average Exercise Price (in dollars per share)	$ 10.96	$ 10.98
Options, Number Exercisable (in shares)	871,478
Options, Weighted-Average Exercise Price (in dollars per share)	$ 10.96
Options vested and expected to vest, Number Outstanding (in shares)	871,478
Options vested and expected to vest, Weighted Average Remaining Contractual Life (in years)	2 years 9 months 29 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 2,295,544
Options vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 10.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2 years 9 months 29 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 2,295,544

Shareholders' Equity and Shar_8

Shareholders' Equity and Share-based Compensation - Employee Share Purchase Plan (Details) - shares	3 Months Ended	107 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common shares under shares repurchase program	0	6,784,648
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility rate	40.70%
Expected term	1 year 3 months 18 days
Dividend yield	0.00%
Minimum | Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.20%
Maximum | Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.40%

Shareholders' Equity and Shar_9

Shareholders' Equity and Share-based Compensation - Share-based Compensation (Details) - USD ($)	1 Months Ended			3 Months Ended			107 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense				$ 2,369,000		$ 3,129,000
Repurchase of common shares under shares repurchase program				0			6,784,648
Options, Weighted-Average Remaining Contractual Life (in years)				2 years 9 months 29 days	3 years 22 days
Options vested and expected to vest, Number Outstanding (in shares)				871,478			871,478
Options vested and expected to vest, Weighted Average Exercise Price (in dollars per share)				$ 10.96			$ 10.96
Options vested and expected to vest, Weighted Average Remaining Contractual Life (in years)				2 years 9 months 29 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value				$ 2,295,544			$ 2,295,544
Options, Number Exercisable (in shares)				871,478			871,478
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price				$ 10.96			$ 10.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				2 years 9 months 29 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value				$ 2,295,544			$ 2,295,544
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at June 30, 2018				876,478
Outstanding at March 31, 2019				871,478	876,478		871,478
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at June 30, 2018 (in dollars per share)				$ 10.98
Outstanding at March 31, 2019 (in dollars per share)				$ 10.96	$ 10.98		$ 10.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value				$ 2,295,544	$ 758,871		$ 2,295,544
Market-based Restricted Stock Units (MSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense				200,000		$ 200,000
Granted (in shares)						1,310,000
Performance Based Restricted Stock Units (PRSUs) Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense				$ 200,000		$ 600,000
Granted (in shares)	291,750	298,050	170,000	0

Shareholders' Equity and Sha_10

Shareholders' Equity and Share-based Compensation - Share-based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Payment Arrangement, Expense	$ 2,369	$ 3,129
Unrecognized compensation expense	$ 10,700
Recognition period of share-based compensation expense (in years)	2 years
Cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Payment Arrangement, Expense	$ 436	497
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Payment Arrangement, Expense	524	632
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Payment Arrangement, Expense	$ 1,409	$ 2,000

Income Taxes - Narrative (Deta

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 410	$ 560
Estimated effective income tax rate excluding discrete income tax expense	(27.30%)	(159.80%)
Unrecognized tax benefits	$ 7,200
Unrecognized tax benefit that would impact effective tax rate	$ 4,300

Segment and Geographic Inform_3

Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 117,802	$ 115,072
Power discrete
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	100,541	92,255
Power IC
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	15,724	19,415
Packaging and testing services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,537	3,402
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	93,102	91,591
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	16,512	20,397
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	5,990	169
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,101	1,973
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,097	$ 942

Segment and Geographic Inform_4

Segment and Geographic Information - Long-lived Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net and land use rights, net	$ 398,701	$ 409,737
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net and land use rights, net	309,423	321,145
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net and land use rights, net	88,456	87,817
Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net and land use rights, net	$ 822	$ 775

Segment and Geographic Inform_5

Segment and Geographic Information - Narratives (Details)	3 Months Ended
	Sep. 30, 2019Segment
Segment Reporting [Abstract]
Number of operating segments	1
Number of reportable segments	1

Commitments and Contingencies -

Commitments and Contingencies - Purchase Commitments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
Raw materials, wafers, and packaging and testing services puchase commitments
Purchase Commitment, Excluding Long-term Committment [Line Items]
Purchase commitment, amount	$ 52.9	$ 59.5
Property and equipment purchase commitments
Purchase Commitment, Excluding Long-term Committment [Line Items]
Purchase commitment, amount	$ 28.6	$ 33.8

Commitments and Contingencies_2

Commitments and Contingencies - Contingencies and Indemnities (Details) - USD ($)	Sep. 30, 2019	Jun. 30, 2019
Indemnification Agreement
Loss Contingencies [Line Items]
Indemnifications accrual	$ 0	$ 0

Subsequent Events - Narrative (

Subsequent Events - Narrative (Details) ¥ in Millions, $ in Millions	1 Months Ended
	Oct. 31, 2019USD ($)	Oct. 31, 2019CNY (¥)	Oct. 31, 2019USD ($)	Sep. 23, 2019CNY (¥)	Sep. 23, 2019USD ($)
Bank Of Communications Limited | Subsequent Event
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity		¥ 60	$ 8.5
China | Base Rate | Bank Of Communications Limited | Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate, multiple		1.05	1.05
Basis spread on variable rate	4.99%
Loan Agreement September 23 2019 | Foreign Line of Credit
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity				¥ 50	$ 7.1
Loan Agreement September 23 2019 | Foreign Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Additional borrowing of short-term debt	$ 1.6