Magnachip Semiconductor (MX) 10-Q 7 Nov 19 2019 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Registrant Name	MAGNACHIP SEMICONDUCTOR Corp
Entity Central Index Key	0001325702
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Address, State or Province	DE
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	MX
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		34,420,689

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 131,341	$ 132,438
Accounts receivable, net	106,289	80,003
Unbilled accounts receivable, net	21,356	38,181
Inventories, net	72,703	71,611
Other receivables	10,015	3,702
Prepaid expenses	15,112	11,133
Hedge collateral (Note 8)	9,990	5,810
Other current assets (Note 17)	7,437	9,867
Total current assets	374,243	352,745
Property, plant and equipment, net (Notes 4 and 6)	178,823	202,171
Operating lease right-of-use assets	11,517
Intangible assets, net	3,913	3,953
Long-term prepaid expenses	10,926	15,598
Other non-current assets	8,715	8,729
Total assets	588,137	583,196
Current liabilities
Accounts payable	79,908	55,631
Other accounts payable	10,843	15,168
Accrued expenses	48,944	46,250
Deferred revenue	5,822	6,477
Operating lease liabilities	2,023
Other current liabilities (Notes 6 and 8)	4,563	9,133
Total current liabilities	152,103	132,659
Long-term borrowings, net	304,155	303,577
Non-current operating lease liabilities	9,494
Accrued severance benefits, net	138,794	146,031
Other non-current liabilities (Note 6)	17,018	18,239
Total liabilities	621,564	600,506
Commitments and contingencies (Note 17)
Stockholders' equity
Common stock, $0.01 par value, 150,000,000 shares authorized, 43,378,017 shares issued and 34,370,689 outstanding at September 30, 2019 and 43,054,458 shares issued and 34,441,232 outstanding at December 31, 2018	434	431
Additional paid-in capital	145,555	142,600
Accumulated deficit	(81,557)	(36,305)
Treasury stock, 9,007,328 shares at September 30, 2019 and 8,613,226 shares at December 31, 2018, respectively	(106,514)	(103,926)
Accumulated other comprehensive income (loss)	8,655	(20,110)
Total stockholders' deficit	(33,427)	(17,310)
Total liabilities and stockholders' equity	$ 588,137	$ 583,196

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	43,378,017	43,054,458
Common stock, shares outstanding	34,370,689	34,441,232
Treasury stock, shares	9,007,328	8,613,226

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 229,677	$ 206,000	$ 592,202	$ 571,504
Cost of sales	168,811	150,251	464,795	417,320
Gross profit	60,866	55,749	127,407	154,184
Operating expenses
Selling, general and administrative expenses	16,812	18,566	51,857	55,123
Research and development expenses	17,368	18,918	56,375	59,503
Restructuring and other charges	763		4,787
Total operating expenses	34,943	37,484	113,019	114,626
Operating income	25,923	18,265	14,388	39,558
Interest expense	(5,656)	(5,587)	(16,972)	(16,539)
Foreign currency gain (loss), net	(21,205)	6,002	(41,633)	(20,129)
Loss on early extinguishment of long-term borrowings, net			(42)
Other income (expense), net	785	150	2,114	(291)
Income (loss) before income tax expense	(153)	18,830	(42,145)	2,599
Income tax expense	1,454	1,608	3,107	4,119
Net income (loss)	$ (1,607)	$ 17,222	$ (45,252)	$ (1,520)
Earnings (loss) per common share—
Basic	$ (0.05)	$ 0.50	$ (1.32)	$ (0.04)
Diluted	$ (0.05)	$ 0.41	$ (1.32)	$ (0.04)
Weighted average number of shares—
Basic	34,357,745	34,573,377	34,266,513	34,416,887
Diluted	34,357,745	46,021,610	34,266,513	34,416,887

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (1,607)	$ 17,222	$ (45,252)	$ (1,520)
Other comprehensive income (loss)
Foreign currency translation adjustments	15,931	(3,827)	30,915	15,806
Derivative adjustments
Fair valuation of derivatives	(2,803)	1,046	(5,703)	(891)
Reclassification adjustment for loss (gain) on derivatives included in net income (loss)	1,600	140	3,553	(4,501)
Total other comprehensive income (loss)	14,728	(2,641)	28,765	10,414
Total comprehensive income (loss)	$ 13,121	$ 14,581	$ (16,487)	$ 8,894

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Deficit) [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance beginning at Dec. 31, 2017	$ (39,637)		$ 426	$ 136,259	$ (40,889)	$ (102,319)	$ (33,114)
Impact of adopting the new revenue standard at Sep. 30, 2018	8,484				8,484
Balance as adjusted, beginning at Dec. 31, 2017	(31,153)		426	136,259	(32,405)	(102,319)	(33,114)
Balance, Shares beginning at Dec. 31, 2017		34,189,599
Stock-based compensation	3,893			3,893
Exercise of stock options	1,113		2	1,111
Exercise of stock options, Shares		159,841
Settlement of restricted stock units			2	(2)
Settlement of restricted stock units, Shares		270,456
Acquisition of treasury stock	(199)					(199)
Acquisition of treasury stock, Shares		(19,432)
Other comprehensive income (loss) net	10,414						10,414
Net income (loss)	(1,520)
Balance ending at Sep. 30, 2018	(17,452)		430	141,261	(33,925)	(102,518)	(22,700)
Balance, Shares ending at Sep. 30, 2018		34,600,464
Balance beginning at Jun. 30, 2018	(33,793)		429	139,502	(51,147)	(102,518)	(20,059)
Impact of adopting the new revenue standard at Sep. 30, 2018	8,484				8,484
Balance, Shares beginning at Jun. 30, 2018		34,483,754
Stock-based compensation	1,083			1,083
Exercise of stock options	677		1	676
Exercise of stock options, Shares		95,088
Settlement of restricted stock units			0	0
Settlement of restricted stock units, Shares		21,622
Acquisition of treasury stock
Acquisition of treasury stock, Shares		0
Other comprehensive income (loss) net	(2,641)						(2,641)
Net income (loss)	17,222				17,222
Balance ending at Sep. 30, 2018	(17,452)		430	141,261	(33,925)	(102,518)	(22,700)
Balance, Shares ending at Sep. 30, 2018		34,600,464
Balance beginning at Dec. 31, 2018	$ (17,310)		431	142,600	(36,305)	(103,926)	(20,110)
Balance, Shares beginning at Dec. 31, 2018	34,441,232	34,441,232
Stock-based compensation	$ 1,920			1,920
Exercise of stock options	1,038		1	1,037
Exercise of stock options, Shares		153,967
Settlement of restricted stock units			2	(2)
Settlement of restricted stock units, Shares		169,592
Acquisition of treasury stock	(2,588)					(2,588)
Acquisition of treasury stock, Shares		(394,102)
Other comprehensive income (loss) net	28,765						28,765
Net income (loss)	(45,252)				(45,252)
Balance ending at Sep. 30, 2019	$ (33,427)		434	145,555	(81,557)	(106,514)	8,655
Balance, Shares ending at Sep. 30, 2019	34,370,689	34,370,689
Balance beginning at Jun. 30, 2019	$ (47,916)		433	144,188	(79,950)	(106,514)	(6,073)
Balance, Shares beginning at Jun. 30, 2019		34,240,181
Stock-based compensation	479			479
Exercise of stock options	889		1	888
Exercise of stock options, Shares		129,409
Settlement of restricted stock units			0	0
Settlement of restricted stock units, Shares		1,099
Other comprehensive income (loss) net	14,728						14,728
Net income (loss)	(1,607)				(1,607)	0
Balance ending at Sep. 30, 2019	$ (33,427)		$ 434	$ 145,555	$ (81,557)	$ (106,514)	$ 8,655
Balance, Shares ending at Sep. 30, 2019	34,370,689	34,370,689

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net loss	$ (45,252)	$ (1,520)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	24,661	23,883
Provision for severance benefits	10,491	14,686
Amortization of debt issuance costs and original issue discount	1,712	1,623
Loss on foreign currency, net	50,512	26,931
Restructuring and other charges	470
Stock-based compensation	1,920	3,893
Loss on early extinguishment of long-term borrowings, net	42
Other	61	(964)
Changes in operating assets and liabilities
Accounts receivable, net	(32,812)	(14,282)
Unbilled accounts receivable, net	14,208	1,187
Inventories, net	(6,321)	(30,296)
Other receivables	(4,814)	(2,669)
Other current assets	6,356	2,514
Accounts payable	27,585	17,414
Other accounts payable	(10,074)	(8,811)
Accrued expenses	3,831	(5,370)
Deferred revenue	(190)	3,560
Other current liabilities	(6,159)	1,533
Other non-current liabilities	808	1,035
Payment of severance benefits	(6,195)	(9,004)
Other	(821)	(329)
Net cash provided by operating activities	30,019	25,014
Cash flows from investing activities
Proceeds from settlement of hedge collateral	12,625	11,290
Payment of hedge collateral	(17,024)	(10,965)
Proceeds from disposal of plant, property and equipment	202	1,685
Purchase of plant, property and equipment	(16,693)	(18,875)
Payment for property related to water treatment facility arrangement (Note 4)		(4,283)
Payment for intellectual property registration	(907)	(776)
Collection of guarantee deposits	539	794
Payment of guarantee deposits	(1,330)	(89)
Other	23	(38)
Net cash used in investing activities	(22,565)	(21,257)
Cash flows from financing activities
Repurchase of long-term borrowings	(1,175)
Proceeds from exercise of stock options	1,038	1,113
Acquisition of treasury stock	(2,588)	(199)
Proceeds from property related to water treatment facility arrangement		4,283
Repayment of financing related to water treatment facility arrangement	(415)	(73)
Repayment of principal portion of finance lease liabilities	(174)
Net cash provided by (used in) financing activities	(3,314)	5,124
Effect of exchange rates on cash, cash equivalents and restricted cash	(5,237)	(3,974)
Net increase (decrease) in cash, cash equivalents and restricted cash	(1,097)	4,907
Cash, cash equivalents and restricted cash
Beginning of the period	132,438	128,575
End of the period	131,341	133,482
Supplemental cash flow information
Cash paid for interest	19,071	19,219
Cash paid for income taxes	1,904	812
Non-cash investing and financing activities
Property, plant and equipment additions in other accounts payable	$ 496	$ 4,668

Business, Basis of Presentation

Business, Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Business, Basis of Presentation and Summary of Significant Accounting Policies	1. Business, Basis of Presentation and Significant Accounting Policies Business MagnaChip Semiconductor Corporation (together with its subsidiaries, the “Company”) is a designer and manufacturer of analog and mixed-signal semiconductor platform solutions for communications, Internet of Things (“IoT”) applications, consumer, industrial and automotive applications. The Company provides technology platforms for analog, mixed signal, power, high voltage, non-volatile Basis of Presentation The accompanying unaudited interim consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States of America (“US GAAP”). These interim consolidated financial statements include normal recurring adjustments and the elimination of all intercompany accounts and transactions which are, in the opinion of management, necessary to provide a fair statement of the Company’s financial condition and results of operations for the periods presented. These interim consolidated financial statements are presented in accordance with Accounting Standards Codification 270, “Interim Reporting” The December 31, 2018 balance sheet data was derived from the Company’s audited financial statements, but does not include all disclosures required by US GAAP. Upon the adoption of Accounting Standards Update (“ASU”) No. 2016-02, 2016-02”) Leases The Company determines if an arrangement is a lease at inception of a contract considering whether the arrangement conveys the right to control the use of an identified asset over the period of use. Control of an underlying asset is conveyed if the Company has the right to direct the use of, and to obtain substantially all of the economic benefits from the use of, the identified asset. The Company accounts for lease transactions as either an operating or a finance lease, depending on the terms of the underlying lease arrangement. Assets related to operating leases are recorded on the balance sheet as operating lease right-of-use non-current non-current right-of-use non-current Right-of-use Right-of-use An extension or contraction of a lease term is considered if the related option to extend or early terminate the lease is reasonably certain to be exercised by the Company. Operating lease right-of-use non-lease non-lease Variable lease payment amounts that cannot be determined at the commencement of the lease such as increases in lease payments based on changes in index rates are not included in the right-of-use The Company does not recognize operating lease right-of-use Revenue Recognition The Company recognizes revenue when it satisfies the performance obligation of transferring control over a product or service to a customer. Revenue is measured based on the consideration specified in a contract with a customer, which consideration is paid in exchange for a product or service. The Foundry Services Group of the Company manufactures products, which the Company refers to as foundry products, based on customers’ specific product designs. The Company recognizes revenue over time for foundry products that do not have an alternative use when the Company has an enforceable right to payment. Revenue recognized over time is in proportion of wafer manufacturing costs incurred relative to total estimated costs for completion. However, in certain circumstances, pursuant to a customer contract or an individual purchase order, the Company may not have an enforceable right to payment for services performed at a given time. In this situation, the Company recognizes revenue at the time when a customer obtains control of the product, which is generally upon product shipment, delivery at the customer’s location or upon customer acceptance, depending on the terms of the arrangement. The Standards Products Group of the Company sells products manufactured based on the Company’s design. The Standard Products Group’s products are either standardized with an alternative use or the Company does not have an enforceable right to payment for the related manufacturing services completed to date. For those products, revenue is recognized when a customer obtains control of the product, which is generally upon product shipment, delivery at the customer’s location or upon customer acceptance, depending on the terms of the arrangement. A portion of the Company’s sales are made through distributors for which the Company applies the same revenue recognition guidance described above. The Company defers the recognition of revenue when it receives consideration from the customers prior to the fulfillment of performance obligations. These amounts are classified as deferred revenue on the consolidated balance sheets. Of the recorded deferred revenue of $6,477 thousand as of December 31, 2018, $188 thousand and $1,750 thousand were recognized as revenue during the three and nine months ended September 30, 2019. Of the recorded deferred revenue of $8,335 thousand as of December 31, 2017, $2,256 thousand and $3,478 thousand were recognized as revenue during the three and nine months ended September 30, 2018, respectively. In accordance with revenue recognition guidance, any tax assessed by a governmental authority that is both imposed on and concurrent with a specific revenue-producing transaction, and that is collected by the Company from a customer, is excluded from revenue and presented in the statements of operations on a net basis. The Company provides warranties under which customers can return defective products. The Company also provides allowances for additional products that may have to be provided free of charge to compensate customers for not meeting previously agreed upon yield criteria, which the Company refers to as the low yield compensation reserve. The Company estimates the costs related to warranty claims, repair or replacements and low yield compensation reserves, and records them as components of cost of sales. In addition, the Company offers sales returns (other than those that relate to defective products under warranty), cash discounts for early payments, sales incentives including discounts and volume rebates, and certain allowances to the Company’s customers, including the Company’s distributors. The Company records reserves for those returns, discounts, incentives and allowances as a deduction from sales, based on historical experience and other quantitative and qualitative factors. Substantially all of the Company’s contracts are one year or less in duration. The standard payment terms with customers are generally thirty to sixty days from the time of shipment, product delivery to the customer’s location or customer acceptance, depending on the terms of the related arrangement. Unbilled accounts receivable represents the Company’s contractual right to consideration for manufacturing work performed on a customer contract or an individual purchase order, which has not been invoiced to the customer. Of the recorded unbilled accounts receivable of $38,181 thousand as of December 31, 2018, $2,993 thousand and $32,780 thousand were billed to customers upon shipment, upon product delivery or upon customer acceptance, depending on the terms of the related arrangement, during the three and nine months ended September 30, 2019, respectively. Recent Accounting Pronouncements In August 2018, the U.S. Securities and Exchange Commission (the “SEC”) adopted the final rule under SEC Release No. 33-10532, No. 33-10532, 33-10231 33-10442, 2019-07 No. 33-10532. 2019-07 In June 2016, the FASB issued ASU No. 2016-13, 2016-13”). 2016-13 No. 2019-04, 2019-04”) 2016-13 2019-04 2016-13 2019-04 In August 2018, the FASB issued Accounting Standards Update No. 2018-13 2018-13”). 2018-13 2018-13 Recently Adopted Accounting Pronouncements In February 2018, the FASB issued Accounting Standards Update No. 2018-02, 2018-02 In August 2017, the FASB issued Accounting Standards Update No. 2017-12, 2017-12”). 2017-12 2017-12 2017-12 In July 2017, the FASB issued Accounting Standards Update No. 2017-11, 2017-11”), 2017-11 In February 2016, the FASB issued Accounting Standards Update No. 2016-02, 2016-02”) 2016-02 right-of-use 2018-01, 2018-01”). 2018-01 2016-02 2018-10, 2018-10”). 2018-10 2018-11, 2018-11”). 2018-11 2016-02 2018-20, 2018-20”). 2018-20 2016-02. 2019-01 2019-01”) 2016-02, 2018-01, 2018-10, 2018-11, 2018-20 2019-01 The Company adopted the new lease standard as of January 1, 2019, using the modified retrospective transition method, which requires a cumulative effect adjustment, if any, to the Company’s beginning equity to be recognized on the date of adoption. There was no cumulative effect adjustment recorded on January 1, 2019. Accordingly, all periods prior to January 1, 2019, were presented in accordance with the previous FASB Accounting Standards Codification (“ASC”) Topic 840, Leases, and no retrospective adjustments were made to the comparative periods presented. The impact from the adoption was the balance sheet recognition of right-of-use

Sales of Accounts Receivable an

Sales of Accounts Receivable and Receivable Discount Program	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Sales of Accounts Receivable and Receivable Discount Program	2. Sales of Accounts Receivable and Receivable Discount Program The Company has entered into an agreement to sell selected trade accounts receivable to a financial institution from time to time since March 2012. After the sale, the Company does not retain any interest in the receivables and the applicable financial institution collects these accounts receivable directly from the customer. The proceeds from the sales of these accounts receivable totaled $14,474 thousand and $17,156 thousand for the nine months ended September 30, 2019 and 2018, respectively, and these sales resulted in pre-tax The Company uses receivable discount programs with certain customers. These discount arrangements allow the Company to accelerate collection of customers’ receivables.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories	3. Inventories Inventories as of September 30, 2019 and December 31, 2018 consist of the following (in thousands): September 30, December 31, Finished goods $ 11,802 $ 14,334 Semi-finished goods and work-in-process 53,881 39,135 Raw materials 17,546 21,150 Materials in-transit 1,230 1,890 Less: inventory reserve (11,756 ) (4,898 ) Inventories, net $ 72,703 $ 71,611 Changes in inventory reserve for the three and nine months ended September 30, 2019 and 2018 are as follows (in thousands): Three Months Nine Months Three Months Nine Months September 30, 2019 September 30, 2018 Beginning $ (12,253 ) $ (4,898 ) $ (4,699 ) $ (6,391 ) Change in reserve Inventory reserve charged to costs of sales (1,446 ) (11,552 ) (980 ) (4,104 ) Sale of previously reserved inventory 961 1,982 1,208 2,937 (485 ) (9,570 ) 228 (1,167 ) Write off 481 1,823 656 3,525 Translation adjustments 501 889 (35 ) 183 Ending balance $ (11,756 ) $ (11,756 ) $ (3,850 ) $ (3,850 ) Inventory reserve represents the Company’s best estimate in value lost due to excessive inventory level, physical deterioration, obsolescence, changes in price levels, or other causes based on individual facts and circumstances. Inventory reserve relates to inventory items including finished goods, semi-finished goods, work-in-process During the first half of 2019, the Company recorded inventory reserves of $5,475 thousand related to certain legacy display products.

Property, Plant and Equipment

Property, Plant and Equipment	9 Months Ended
	Sep. 30, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	4. Property, Plant and Equipment Property, plant and equipment as of September 30, 2019 and December 31, 2018 are comprised of the following (in thousands): September 30, December 31, Buildings and related structures $ 65,933 $ 70,665 Machinery and equipment 312,758 323,325 Finance lease right-of-use 2,368 — Others 40,618 44,724 421,677 438,714 Less: accumulated depreciation (257,205 ) (251,962 ) Land 14,351 15,419 Property, plant and equipment, net $ 178,823 $ 202,171 Aggregate depreciation expenses totaled $23,994 thousand and $23,272 thousand for the nine months ended September 30, 2019 and 2018, respectively. As of June 29, 2018, the Company’s Korean subsidiary entered into an arrangement whereby it acquired a water treatment facility to support its fab in Gumi, Korea from SK Hynix for $4,172 thousand, and sold it for $4,172 thousand to a third party management company that the Company has engaged to run the facility for a 10-year non-current

Intangible Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	5. Intangible Assets Intangible assets as of September 30, 2019 and December 31, 2018 are comprised of the following (in thousands): September 30, 2019 Gross Accumulated Net Technology $ 18,010 $ (18,010 ) $ — Customer relationships 25,866 (25,866 ) — Intellectual property assets 11,672 (7,759 ) 3,913 Intangible assets, net $ 55,548 $ (51,635 ) $ 3,913 December 31, 2018 Gross Accumulated Net Technology $ 19,350 $ (19,350 ) $ — Customer relationships 27,791 (27,791 ) — Intellectual property assets 11,571 (7,618 ) 3,953 Intangible assets, net $ 58,712 $ (54,759 ) $ 3,953 Aggregate amortization expenses for intangible assets totaled $667 thousand and $611 thousand for the nine months ended September 30, 2019 and 2018, respectively.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	6. Leases The Company has operating and finance leases for land, buildings and other assets such as vehicles and office equipment. The Company’s leases have remaining lease terms ranging from 1 year to 15 years. For certain leases, the Company has options to extend the lease term for additional periods ranging from 1 year to 10 years. The Company used hindsight for determining the remaining lease term and assessing the likelihood of whether these renewal options are reasonably certain to be exercised by the Company. The Company’s land lease payment is subject to a biennial adjustment (based on change of the Consumer Price Index), the impact of which is treated as a variable lease payment. The Company adopted the new lease accounting standard as of January 1, 2019, using the modified retrospective transition method. The tables below present financial information related to the Company’s leases. Supplemental balance sheet information related to leases is as follows (in thousands): Leases Classification As of Assets Operating lease Operating lease right-of-use $ 11,517 Finance lease Property, plant and equipment, net 2,147 Total leased assets $ 13,664 Liabilities Current Operating Operating lease liabilities $ 2,023 Finance Other current liabilities 238 Non-current Operating Non-current 9,494 Finance Other non-current 1,961 Total lease liabilities $ 13,716 The components of lease cost included in the Company’s consolidated statements of operations, are as follows (in thousands): Three Months Nine Months September 30, 2019 Operating lease cos t $ 767 $ 2,395 Finance lease cost Amortization of right-of-use 74 228 Interest on lease liabilities 43 135 Total lease cost $ 884 $ 2,758 The above table does not include an immaterial cost of short-term leases and a variable lease payment during the three and nine months ended September 30, 2019. Other lease information is as follows (in thousands): Three Months Nine Months September 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 767 $ 2,395 Operating cash flows from finance leases 43 135 Financing cash flows from finance leases 56 174 As of September 30, Weighted average remaining lease term Operating leases 12.4 years Finance leases 10.5 years Weighted average remaining lease term Operating leases 7.96 % Finance leases 7.94 % The aggregate future lease payments for operating and finance leases as of September 30, 2019 are as follows (in thousands): Operating Finance 2019 $ 730 $ 100 2020 2,679 398 2021 1,306 398 2022 1,057 398 2023 1,048 398 Thereafter 11,281 1,555 Total future lease payments 18,101 3,247 Less: Present value adjustment (6,584 ) (1,048 ) Present value of future payments $ 11,517 $ 2,199 As of December 31, 2018, the minimum aggregate rental payments due under non-cancelable 2019 $ 4,319 2020 3,569 2021 1,570 2022 1,319 2023 1,309 2024 and thereafter 13,978 $ 26,064

Accrued Expenses

Accrued Expenses	9 Months Ended
	Sep. 30, 2019
Payables and Accruals [Abstract]
Accrued Expenses	7. Accrued Expenses Accrued expenses as of September 30, 2019 and December 31, 2018 are comprised of the following (in thousands): September 30, December 31, Payroll, benefits and related taxes, excluding severance benefits $ 18,523 $ 14,548 Withholding tax attributable to intercompany interest income 22,705 20,879 Interest on senior notes 3,444 8,226 Outside service fees 888 935 Others 3,384 1,662 Accrued expenses $ 48,944 $ 46,250

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	8. Derivative Financial Instruments The Company’s Korean subsidiary from time to time has entered into zero cost collar and forward contracts to hedge the risk of changes in the functional-currency-equivalent cash flows attributable to currency rate changes on U.S. dollar denominated revenues. Details of derivative contracts as of September 30, 2019 are as follows (in thousands): Date of transaction Type of derivative Total notional amount Month of settlement April 2, 2019 Zero cost collar $ 15,000 October 2019 to December 2019 April 9, 2019 Zero cost collar $ 15,000 October 2019 to December 2019 April 25, 2019 Zero cost collar $ 15,000 October 2019 to December 2019 August 13, 2019 Zero cost collar $ 60,000 January 2020 to June 2020 September 27, 2019 Zero cost collar $ 42,000 January 2020 to June 2020 Details of derivative contracts as of December 31, 2018 are as follows (in thousands): Date of transaction Type of derivative Total notional amount Month of settlement June 27, 2018 Zero cost collar $ 18,000 January 2019 to June 2019 June 27, 2018 Forward $ 36,000 January 2019 to June 2019 The zero cost collar and forward contracts qualify as cash flow hedges under ASC 815, “Derivatives and Hedging,” since at both the inception of the contracts and on an ongoing basis, the hedging relationship was and is expected to be highly effective in achieving offsetting cash flows attributable to the hedged risk during the term of the contracts. The fair values of the Company’s outstanding zero cost collar and forward contracts recorded as assets and liabilities as of September 30, 2019 and December 31, 2018 are as follows (in thousands): Derivatives designated as hedging instruments: September 30, December 31, Asset Derivatives : Zero cost collar s Other current assets $ 13 $ — Liability Derivatives: Zero cost collars Other current liabilities $ 2,234 $ 117 Forward Other current liabilities $ — $ 607 Offsetting of derivative assets and liabilities as of September 30, 2019 is as follows (in thousands): As of September 30, 2019 Gross amounts of Gross amounts Net amounts of Gross amounts not offset Net amount Financial Cash collateral Asset Derivatives: Zero cost collars $ 13 $ — $ 13 $ — $ — $ 13 Liability Derivatives: Zero cost collars $ 2,234 $ — $ 2,234 $ — $ (590 ) $ 1,644 Offsetting of derivative liabilities as of December 31, 2018 is as follows (in thousands): As of December 31, 2018 Gross amounts of Gross amounts Net amounts of Gross amounts not offset Net amount Financial Cash collateral Liability Derivatives : Zero cost collars $ 117 $ — $ 117 $ — $ (360 ) $ (243 ) Forward $ 607 $ — $ 607 $ — $ (1,450 ) $ (843 ) For derivative instruments that are designated and qualify as cash flow hedges, gains or losses on the derivative aside from components excluded from the assessment of effectiveness, are reported as a component of accumulated other comprehensive income (“AOCI”) and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative, representing hedge components excluded from the assessment of effectiveness, are recognized in current earnings. The following table summarizes the impact of derivative instruments on the consolidated statements of operations for the three months ended September 30, 2019 and 2018 (in thousands): Derivatives in ASC 815 Cash Flow Hedging Relationships Amount of Gain (Loss) Location/Amount of Loss Into Statement of Operations Location/Amount of Gain (Loss) Three Months Ended Three Months Ended Three Months Ended 2019 2018 2019 2018 2019 2018 Zero cost collars $ (2,803 ) $ 386 Net sales $ (1,600 ) $ — Other income $ (33 ) $ 18 Forwards $ — $ 660 Net sales $ — $ (140 ) Other income $ — $ (102 ) Forwards—excluded time value (1) Other income $ — $ (434 ) $ (2,803 ) $ 1,046 $ (1,600 ) $ (140 ) $ (33 ) $ (518 ) Total Revenue $ 229,677 $ 206,000 The following table summarizes the impact of derivative instruments on the consolidated statement of operations for the nine months ended September 30, 2019 and 2018 (in thousands): Derivatives in ASC 815 Cash Flow Hedging Relationships Amount of Loss Location/Amount of Gain (Loss) Into Statement of Operations Location/Amount of Loss Nine Months Ended Nine Months Ended Nine Months Ended 2019 2018 2019 2018 2019 2018 Zero cost collars $ (3,905 ) $ (756 ) Net sales $ (1,803 ) $ 2,191 Other income $ (44 ) $ (300 ) Forwards $ (1,798 ) $ (135 ) Net sales $ (1,750 ) $ 2,310 Other income $ (125 ) $ (1,765 ) Forwards—excluded time value (1) Other income $ — $ (161 ) $ (5,703 ) $ (891 ) $ (3,553 ) $ 4,501 $ (169 ) $ (2,226 ) Total Revenue $ 592,202 $ 571,504 (1) The FASB issued the new guidance about hedging activities (ASU 2017-12), As of September 30, 2019, the amount expected to be reclassified from accumulated other comprehensive income into loss within the next twelve months is $2,199 thousand. The Company set aside $9,400 thousand and $4,000 thousand in cash deposits to the counterparties, Nomura Financial Investment (Korea) Co., Ltd. (“NFIK”) and Deutsche Bank AG, Seoul Branch (“DB”), as required for the zero cost collar and forward contracts outstanding as of September 30, 2019 and December 31, 2018, respectively. These cash deposits are recorded as hedge collateral on the consolidated balance sheets. The Company is required to deposit additional cash collateral with NFIK and DB for any exposure in excess of $500 thousand, and $590 thousand and $1,810 thousand of additional cash collateral were required and recorded as hedge collateral on the consolidated balance sheets as of September 30, 2019 and December 31, 2018, respectively. These forward and zero cost collar contracts may be terminated by the counterparty in a number of circumstances, including if the Company’s long-term debt rating falls below B-/B3

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	9. Fair Value Measurements Fair Value of Financial Instruments As of September 30, 2019, the following table represents the Company’s assets and liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands): Carrying Value Fair Value Quoted Prices in Significant Significant Assets: Derivative assets (other current assets) $ 13 $ 13 — $ 13 — Liabilities: Derivative liabilities (other current liabilities) $ 2,234 $ 2,234 — $ 2,234 — As of December 31, 2018, the following table represents the Company’s liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands): Carrying Value Fair Value Quoted Prices in Significant Significant Liabilities: Derivative liabilities (other current liabilities) $ 724 $ 724 — $ 724 — Items not reflected in the table above include cash equivalents, accounts receivable, other receivables, accounts payable, and other accounts payable, fair value of which approximate carrying values due to the short-term nature of these instruments. The fair value of assets and liabilities whose carrying value approximates fair value is determined using Level 2 inputs. Fair Value of Long-Term Borrowings September 30, 2019 December 31, 2018 Carrying Fair Carrying Fair (In thousands of US dollars) Long-term Borrowings : 5.0% Exchangeable Senior Notes due March 2021 (Level 2) $ 81,594 $ 116,078 $ 81,418 $ 86,835 6.625% Senior Notes due July 2021 (Level 2) $ 222,561 $ 219,765 $ 222,159 $ 202,046 On January 17, 2017, the Company’s wholly-owned subsidiary, MagnaChip Semiconductor S.A., closed an offering (the “Exchangeable Notes Offering”) of 5.0% Exchangeable Senior Notes due March 1, 2021 On July 18, 2013, the Company issued 6.625% senior notes due July 15, 2021 (the “2021 Notes”) of $225,000 thousand, which represents the principal amount, excluding $1,125 thousand of original issue discount and $5,039 thousand of debt issuance costs. In December 2018 and January 2019, the Company repurchased a principal amount equal to $500 thousand and $250 thousand, respectively, of the 2021 Notes in the open market. The Company estimates the fair value of the 2021 Notes using the market approach, which utilizes quoted market prices that fall under Level 2. For further description of the 2021 Notes, see Note 10, “Long-Term Borrowings.” Fair Values Measured on a Non-recurring The Company’s non-financial non-recurring

Long-term Borrowings

Long-term Borrowings	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Long-term Borrowings	10. Long-Term Borrowings Long-term borrowings as of September 30, 2019 and December 31, 2018 are as follows (in thousands): September 30, December 31, 5.0 March 2021 $ 83,740 $ 84,660 6.625% Senior Notes due July 2021 $ 224,250 $ 224,500 Less: unamortized discount and debt issuance costs (3,835 ) (5,583 ) Long-term borrowings, net of unamortized discount and debt issuance costs $ 304,155 $ 303,577 5.0% Exchangeable Senior Notes On January 17, 2017, MagnaChip Semiconductor S.A. closed the Exchangeable Notes Offering of $86,250 thousand aggregate principal amount of 5.0% Exchangeable Notes. Interest on the Exchangeable Notes accrues at a rate of 5.0% per annum, payable semi-annually on March 1 and September 1 of each year, beginning on March 1, 2017. The Exchangeable Notes will mature on March 1, 2021, unless earlier repurchased or converted. Holders may convert their notes at their option at any time prior to the close of business on the business day immediately preceding the stated maturity date. The Company used a portion of the net proceeds from the issuance to repurchase 1,795,444 shares of common stock under its stock repurchase program at an aggregate cost of $11,401 thousand. Upon conversion, the Company will deliver for each $1,000 principal amount of converted notes a number of shares equally to the exchange rate, which will initially be 121.1387 shares of common stock per $1,000 principal amount of Exchangeable Notes, equivalent to an initial exchange price of approximately $8.26 per share of common stock. The exchange rate will be subject to adjustment in some circumstances, but will not be adjusted for any accrued and unpaid interest. In addition, if a “make-whole fundamental change” (as defined in the Exchangeable Notes indenture (the “Exchangeable Notes Indenture”)) occurs prior to the stated maturity date, the Company will increase the exchange rate for a holder who elects to convert its notes in connection with such make-whole fundamental change in certain circumstances. MagnaChip Semiconductor S.A. may also, under certain circumstances, be required to pay additional amounts to holders of Exchangeable Notes if withholding or deduction is required in a relevant tax jurisdiction. If the Company undergoes a fundamental change, subject to certain conditions, holders may require the Company to repurchase for cash all or part of their notes at a purchase price equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change purchase date. In addition, upon certain events of default described in the Exchangeable Notes Indenture, the trustee or holders of at least 25% principal amount of the Exchangeable Notes may declare 100% of the then outstanding Exchangeable Notes due and payable in full, together with all accrued and unpaid interest thereon. Payment of principal on the Exchangeable Notes may also accelerate and become automatically due and payable upon certain events of default involving bankruptcy or insolvency proceedings involving the Company, MagnaChip Semiconductor S.A. and their significant subsidiaries. The Exchangeable Notes are not redeemable at the option of MagnaChip Semiconductor S.A. prior to the maturity date. The Exchangeable Notes Indenture contains covenants that limit the ability of the Company, MagnaChip Semiconductor S.A. and the Company’s other restricted subsidiaries to: (i) declare or pay any dividend or make any payment or distribution on account of or purchase or redeem the Company’s capital stock or equity interests of the restricted subsidiaries; (ii) make any principal payment on, or redeem or repurchase, prior to any scheduled repayment or maturity, any subordinated indebtedness; (iii) make certain investments; (iv) incur additional indebtedness and issue certain types of capital stock; (v) create or incur any lien (except for permitted liens) that secures obligations under any indebtedness; (vi) merge with or into or sell all or substantially all of the Company’s assets to other companies; (vii) enter into certain types of transactions with affiliates; (viii) guarantee the payment of any indebtedness; and (ix) designate unrestricted subsidiaries. These covenants are subject to a number of exceptions and qualifications. Certain of these restrictive covenants will terminate if the Exchangeable Notes are rated investment grade at any time. The Company incurred debt issuance costs of $5,902 thousand related to the issuance of the Exchangeable Notes. The debt issuance costs are recorded as a direct deduction from the long-term borrowings in the consolidated balance sheets and amortized to interest expense using the effective interest method over the term of the Exchangeable Notes. Interest expense related to the Exchangeable Notes for the three and nine months ended September 30, 2019 were $1,404 thousand and $4,206 thousand, respectively. Interest expense related to the Exchangeable Notes for the three and nine months ended September 30, 2018 were $1,422 thousand and $4,251 thousand, respectively. In December 2018, the Company repurchased a principal amount equal to $1,590 thousand of the Exchangeable Notes in the open market, resulting in a loss of $234 thousand, which was recorded as loss on early extinguishment of long-term borrowings, net in the consolidated statements of operations for the year ended December 31, 2018. In February 2019, the Company repurchased a principal amount equal to $920 thousand of the Exchangeable Notes in the open market, resulting in a loss of $63 thousand, which was recorded as loss on early extinguishment of long-term borrowings, net in the consolidated statements of operations for the nine months ended September 30, 2019. 6.625% Senior Notes On July 18, 2013, the Company issued a $225,000,000 aggregate principal amount of the 2021 Notes at a price of 99.5%. Interest on the 2021 Notes accrues at a rate of 6.625% per annum, payable semi-annually on January 15 and July 15 of each year, beginning on January 15, 2014. On or after July 15, 2019, the Company can optionally redeem all or a part of the 2021 Notes at a redemption price equal to 100% of the principal amount of the notes plus accrued and unpaid interest and special interest, if any, on the notes redeemed, to the applicable date of redemption. The Indenture relating to the 2021 Notes contains covenants that limit the ability of the Company and its restricted subsidiaries to: (i) declare or pay any dividend or make any payment or distribution on account of or purchase or redeem the Company’s capital stock or equity interests of the restricted subsidiaries; (ii) make any principal payment on, or redeem or repurchase, prior to any scheduled repayment or maturity, any subordinated indebtedness; (iii) make certain investments; (iv) incur additional indebtedness and issue certain types of capital stock; (v) create or incur any lien (except for permitted liens) that secures obligations under any indebtedness; (vi) merge with or into or sell all or substantially all of the Company’s assets to other companies; (vii) enter into certain types of transactions with affiliates; (viii) guarantee the payment of any indebtedness; (ix) enter into sale-leaseback transactions; (x) enter into agreements that would restrict the ability of the restricted subsidiaries to make distributions with respect to their equity to the Company or other restricted subsidiaries, to make loans to the Company or other restricted subsidiaries or to transfer assets to the Company or other restricted subsidiaries; and (xi) designate unrestricted subsidiaries. These covenants are subject to a number of exceptions and qualifications. Certain of these restrictive covenants will terminate if the 2021 Notes are rated investment grade at any time. The Company incurred original issue discount of $1,125 thousand and debt issuance costs of $5,039 thousand related to the issuance of the 2021 Notes. The original issue discount and the debt issuance costs are recorded as a direct deduction from the long-term borrowings in the consolidated balance sheets and amortized to interest expense using the effective interest method over the term of the 2021 Notes. Interest expense related to the 2021 Notes for the three and nine months ended September 30, 2019 was $3,935 thousand and $11,794 thousand, respectively. Interest expense related to the 2021 Notes for the three and nine months ended September 30, 2018 was $3,933 thousand and $11,785 thousand, respectively. In December 2018, the Company repurchased a principal amount equal to $500 thousand of the 2021 Notes in the open market, resulting in a net gain of $28 thousand, which was recorded as loss on early extinguishment of long-term borrowings, net in the consolidated statements of operations for the year ended December 31, 2018. In January 2019, the Company repurchased a principal amount equal to $250 thousand of the 2021 Notes in the open market, resulting in a net gain of $21 thousand, which was recorded as loss on early extinguishment of long-term borrowings, net in the consolidated statements of operations for the nine months ended September 30, 2019.

Accrued Severance Benefits

Accrued Severance Benefits	9 Months Ended
	Sep. 30, 2019
Postemployment Benefits [Abstract]
Accrued Severance Benefits	11. Accrued Severance Benefits The majority of accrued severance benefits are for employees in the Company’s Korean subsidiary. Pursuant to the Employee Retirement Benefit Security Act of Korea, eligible employees and executive officers with one or more years of service are entitled to severance benefits upon the termination of their employment based on their length of service and rate of pay. As of September 30, 2019, 98% of employees of the Company were eligible for severance benefits. Changes in accrued severance benefits are as follows (in thousands): Three Months Ended Nine Months Ended Three Months Ended Nine Months Ended September 30, 2019 September 30, 2018 Beginning balance $ 146,261 $ 149,408 $ 146,375 $ 149,795 Provisions 4,085 10,491 5,521 14,686 Severance payments (1,616 ) (6,195 ) (3,250 ) (9,004 ) Translation adjustments (5,413 ) (10,387 ) 1,194 (5,637 ) 143,317 143,317 149,840 149,840 Less: Cumulative contributions to severance insurance deposit accounts (3,760 ) (3,760 ) (858 ) (858 ) The National Pension Fund (211 ) (211 ) (236 ) (236 ) Group severance insurance plan (552 ) (552 ) (598 ) (598 ) Accrued severance benefits, net $ 138,794 $ 138,794 $ 148,148 $ 148,148 The severance benefits funded through the Company’s National Pension Fund and group severance insurance plan will be used exclusively for payment of severance benefits to eligible employees. These amounts have been deducted from the accrued severance benefit balance. Beginning in July 2018, the Company has contributed a certain percentage of severance benefits, accrued for eligible employees for their services from January 1, 2018, to certain severance insurance deposit accounts. These accounts consist of time deposits and other guaranteed principal and interest, and are maintained at insurance companies, banks or security companies for the benefit of employees. The Company deducts the contributions made to these severance insurance deposit accounts from its accrued severance benefits. The Company is liable to pay the following future benefits to its non-executive Severance benefit Remainder of 2019 $ 551 2020 1,018 2021 1,485 2022 1,243 2023 1,679 2024 2,531 2025 – 2029 33,706 The above amounts were determined based on the non-executive non-executive Korea’s mandatory retirement age is 60 under the Employment Promotion for the Aged Act.

Foreign Currency Gain (Loss), N

Foreign Currency Gain (Loss), Net	9 Months Ended
	Sep. 30, 2019
Foreign Currency [Abstract]
Foreign Currency Loss,	12. Foreign Currency Gain (Loss), Net Net foreign currency gain or loss includes non-cash non-cash

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	13 . Income Taxes The Company files income tax returns in the U.S., Korea, Japan, Taiwan and various other jurisdictions. The Company is subject to income- or non-income-based Income tax expense recorded for the three and nine months ended September 30, 2019 was $1,454 thousand and $3,107 thousand, respectively. Income tax expense recorded for the three and nine months ended September 30, 2018 was $1,608 thousand and $4,119 thousand, respectively. Income tax expense was recorded for the Company’s Korean subsidiary based on the estimated taxable income for the respective periods, combined with its ability to utilize net operating loss carryforwards up to 70% in 2018 and 60% in 2019. On December 22, 2017, H.R. 1, originally known as the Tax Cuts and Jobs Act, was enacted in the U.S. (the “Tax Reform Act”). The Tax Reform Act reduces the U.S. federal statutory rate to 21.0% from 35.0% effective January 1, 2018. The Tax Reform Act contains several key provisions, including global intangible low tax income and foreign derived intangible income provisions. For the year ended December 31, 2018, the Company analyzed the mandatory deemed repatriation tax and concluded that the Company has no tax liability on previously untaxed accumulated earnings and profits of its foreign subsidiaries. Based on the review of the additional guidance and proposed regulations issued during the third quarter of 2019, there was no significant impact on the Company’s consolidated financial statements for the nine months ended September 30, 2019.

Geographic and Segment Informat

Geographic and Segment Information	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Geographic and Segment Information	14. Geographic and Segment Information The Company has two operating segments: its Foundry Services Group and Standard Products Group. The Company’s chief operating decision maker is its Chief Executive Officer, who allocates resources and assesses performance of the business and other activities based on gross profit. The following sets forth information relating to the operating segments (in thousands): Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, Net Sales Foundry Services Group $ 90,340 $ 83,862 $ 220,513 $ 242,198 Standard Products Group Display Solutions 90,550 77,578 233,041 205,986 Power Solutions 48,690 44,458 138,443 123,153 Total Standard Products Group 139,240 122,036 371,484 329,139 All other 97 102 205 167 Total net sales $ 229,677 $ 206,000 $ 592,202 $ 571,504 Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, Gross Profit Foundry Services Group $ 25,547 $ 20,443 $ 41,361 $ 63,292 Standard Products Group 35,222 35,204 85,842 90,874 All other 97 102 204 18 Total gross profit $ 60,866 $ 55,749 $ 127,407 $ 154,184 The Company’s revenue for Foundry Services Group is disaggregated depending on the timing of revenue recognition (in thousands): Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Revenue recognized Revenue Total Revenue recognized Revenue Total Net Sale s Foundry Services Group $ 43,328 $ 47,012 $ 90,340 $ 102,888 $ 117,625 $ 220,513 Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 Revenue recognized Revenue Total Revenue recognized Revenue Total Net Sales Foundry Services Group $ 26,257 $ 57,605 $ 83,862 $ 52,024 $ 190,174 $ 242,198 The following is a summary of net sales by geographic region, based on the location to which the products are billed (in thousands): Three Months Ended September 30, September 30, Korea $ 70,965 $ 91,570 Asia Pacific (other than Korea) 138,125 93,475 U.S.A. 7,182 5,831 Europe 12,916 14,444 Others 489 680 Total $ 229,677 $ 206,000 Nine Months Ended September 30, September 30, Korea $ 190,839 $ 204,319 Asia Pacific (other than Korea) 342,413 302,906 U.S.A. 20,784 29,242 Europe 36,935 33,041 Others 1,231 1,996 Total $ 592,202 $ 571,504 For the three months ended September 30, 2019 and 2018, of the Company’s net sales in Asia Pacific (other than Korea), net sales in Greater China (China, Hong Kong and Macau) represented 73.4% and 64.1%, respectively, and net sales in Taiwan represented 22.3% and 29.7%, respectively. For the nine months ended September 30, 2019 and 2018, of the Company’s net sales in Asia Pacific (other than Korea), net sales in Greater China (China, Hong Kong and Macau) represented 75.9% and 67.6%, respectively, and net sales in Taiwan represented 20.4% and 25.8%, respectively. Net sales from the Company’s top ten largest customers accounted for 69% and 65% for the three months ended September 30, 2019 and 2018, respectively, and 68% and 62% for the nine months ended September 30, 2019 and 2018, respectively. For the three months ended September 30, 2019, the Company had one customer that represented 34.0% of its net sales, and for the nine months ended September 30, 2019, the Company had one customer that represented 33.0% of its net sales. For the three months ended September 30, 2018, the Company had two customers that represented 18.8% and 17.6% of its net sales, respectively, and for the nine months ended September 30, 2018, the Company had two customers that represented 21.6% and 13.0% of its net sales, respectively. 98% of the Company’s property, plant and equipment are located in Korea as of September 30, 2019.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	15. Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive income (loss) consists of the following as of September 30, 2019 and December 31, 2018, respectively (in thousands): September 30, December 31, Foreign currency translation adjustments $ 10,854 $ (20,061 ) Derivative adjustments (2,199 ) (49 ) Total $ 8,655 $ (20,110 ) Changes in accumulated other comprehensive income (loss) for the three months ended September 30, 2019 and 2018 are as follows (in thousands): Three Months Ended September 30, 2019 Foreign Derivative Total Beginning balanc e $ (5,077 ) $ (996 ) $ (6,073 ) Other comprehensive income (loss) before reclassifications 15,931 (2,803 ) 13,128 Amounts reclassified from accumulated other comprehensive loss — 1,600 1,600 Net current-period other comprehensive income (loss) 15,931 (1,203 ) 14,728 Ending balance $ 10,854 $ (2,199 ) $ 8,655 Three Months Ended September 30, 2018 Foreign Derivative Total Beginning balanc e $ (18,780 ) $ (1,279 ) $ (20,059 ) Other comprehensive income (loss) before reclassifications (3,827 ) 1,046 (2,781 ) Amounts reclassified from accumulated other comprehensive loss — 140 140 Net current-period other comprehensive income (loss ) (3,827 ) 1,186 (2,641 ) Ending balanc e $ (22,607 ) $ (93 ) $ (22,700 ) Changes in accumulated other comprehensive income (loss) for the nine months ended September 30, 2019 and 2018 are as follows (in thousands): Nine Months Ended September 30, 2019 Foreign Derivative Total Beginning balanc e $ (20,061 ) $ (49 ) $ (20,110 ) Other comprehensive income (loss) before reclassification s 30,915 (5,703 ) 25,212 Amounts reclassified from accumulated other comprehensive los s — 3,553 3,553 Net current-period other comprehensive income (loss ) 30,915 (2,150 ) 28,765 Ending balanc e $ 10,854 $ (2,199 ) $ 8,655 Nine Months Ended September 30, 201 8 Foreign Derivative Total Beginning balanc e $ (38,413 ) $ 5,299 $ (33,114 ) Other comprehensive income (loss) before reclassification s 15,806 (891 ) 14,915 Amounts reclassified from accumulated other comprehensive incom e — (4,501 ) (4,501 ) Net current-period other comprehensive income (loss ) 15,806 (5,392 ) 10,414 Ending balanc e $ (22,607 ) $ (93 ) $ (22,700 ) There was no income tax impact related to changes in accumulated other comprehensive income (loss) for the nine months ended September 30, 2019 and 2018 due to net operating loss carry-forwards available to offset taxable income and full allowance for deferred tax assets.

Earnings (Loss) per Share

Earnings (Loss) per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings (Loss) per Share	16. Earnings (Loss) per Share The following table illustrates the computation of basic and diluted earnings (loss) per common share for the three and nine months ended September 30, 2019 and 2018: Three Months Ended September 30, September 30, (In thousands of US dollars, except share data) Basic Earnings (Loss) per Share Net income (loss) $ (1,607 ) $ 17,222 Basic weighted average common stock outstanding 34,357,745 34,573,377 Basic earnings (loss) per share $ (0.05 ) $ 0.50 Diluted Earnings (Loss) per Share Net income (loss) $ (1,607) $ 17,222 Add back: Interest expense on Exchangeable Notes — 1,422 Net income (loss) allocated to common stockholders $ (1,607 ) $ 18,644 Basic weighted average common stock outstanding 34,357,745 34,573,377 Net effect of dilutive equity awards — 1,000,020 Net effect of assumed conversion of 5.0% Exchangeable Notes to common stock — 10,448,213 Diluted weighted average common stock outstanding 34,357,745 46,021,610 Diluted earnings (loss) per share $ (0.05 ) $ 0.41 Nine Months Ended September 30, September 30, (In thousands of US dollars, except share data) Basic and Diluted Loss per Share Net loss $ (45,252 ) $ (1,520 ) Basic and diluted weighted average common stock outstanding 34,266,513 34,416,887 Basic and diluted loss per share $ (1.32 ) $ (0.04 ) The following outstanding instruments were excluded from the computation of diluted earnings (loss) per share, as they have an anti-dilutive effect on the calculation: Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, Options 2,479,423 723,117 2,479,423 2,684,558 Restricted Stock Units 592,967 — 592,967 581,759 For the three months ended September 30, 2019, 10,144,155, for the nine months ended September 30, 2019, 10,156,810, and for the nine months ended September 30, 2018, 10,448,213, of potential common stock from the assumed conversion of Exchangeable Notes were excluded from the computation of diluted loss per share as the effect was anti-dilutive for the periods.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	17. Commitments and Contingencies Long-term Purchase Agreements and Advances to Suppliers The Company purchases raw materials from a variety of vendors. During the normal course of business, in order to manage manufacturing lead times and help assure adequacy supply, the Company from time to time may enter into multi-year purchase agreements, which specify future quantities and pricing of materials to be supplied by the vendors. The Company reviews the terms of the long-term supply agreements and assesses the need for any accrual for estimated losses, such as lower of cost or net realizable value that will not be recovered by future sales prices. No such accrual was required as of September 30, 2019 and December 31, 2018, respectively. The Company, from time to time, may make prepayments to suppliers to procure materials to meet its planned production. The Company recorded prepayments of $5,847 thousand and $8,132 thousand as other current assets as of September 30, 2019 and December 31, 2018, respectively.

Business, Basis of Presentati_2

Business, Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Business	Business MagnaChip Semiconductor Corporation (together with its subsidiaries, the “Company”) is a designer and manufacturer of analog and mixed-signal semiconductor platform solutions for communications, Internet of Things (“IoT”) applications, consumer, industrial and automotive applications. The Company provides technology platforms for analog, mixed signal, power, high voltage, non-volatile
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States of America (“US GAAP”). These interim consolidated financial statements include normal recurring adjustments and the elimination of all intercompany accounts and transactions which are, in the opinion of management, necessary to provide a fair statement of the Company’s financial condition and results of operations for the periods presented. These interim consolidated financial statements are presented in accordance with Accounting Standards Codification 270, “Interim Reporting” The December 31, 2018 balance sheet data was derived from the Company’s audited financial statements, but does not include all disclosures required by US GAAP. Upon the adoption of Accounting Standards Update (“ASU”) No. 2016-02, 2016-02”)
Leases	Leases The Company determines if an arrangement is a lease at inception of a contract considering whether the arrangement conveys the right to control the use of an identified asset over the period of use. Control of an underlying asset is conveyed if the Company has the right to direct the use of, and to obtain substantially all of the economic benefits from the use of, the identified asset. The Company accounts for lease transactions as either an operating or a finance lease, depending on the terms of the underlying lease arrangement. Assets related to operating leases are recorded on the balance sheet as operating lease right-of-use non-current non-current right-of-use non-current Right-of-use Right-of-use An extension or contraction of a lease term is considered if the related option to extend or early terminate the lease is reasonably certain to be exercised by the Company. Operating lease right-of-use non-lease non-lease Variable lease payment amounts that cannot be determined at the commencement of the lease such as increases in lease payments based on changes in index rates are not included in the right-of-use The Company does not recognize operating lease right-of-use
Revenue Recognition	Revenue Recognition The Company recognizes revenue when it satisfies the performance obligation of transferring control over a product or service to a customer. Revenue is measured based on the consideration specified in a contract with a customer, which consideration is paid in exchange for a product or service. The Foundry Services Group of the Company manufactures products, which the Company refers to as foundry products, based on customers’ specific product designs. The Company recognizes revenue over time for foundry products that do not have an alternative use when the Company has an enforceable right to payment. Revenue recognized over time is in proportion of wafer manufacturing costs incurred relative to total estimated costs for completion. However, in certain circumstances, pursuant to a customer contract or an individual purchase order, the Company may not have an enforceable right to payment for services performed at a given time. In this situation, the Company recognizes revenue at the time when a customer obtains control of the product, which is generally upon product shipment, delivery at the customer’s location or upon customer acceptance, depending on the terms of the arrangement. The Standards Products Group of the Company sells products manufactured based on the Company’s design. The Standard Products Group’s products are either standardized with an alternative use or the Company does not have an enforceable right to payment for the related manufacturing services completed to date. For those products, revenue is recognized when a customer obtains control of the product, which is generally upon product shipment, delivery at the customer’s location or upon customer acceptance, depending on the terms of the arrangement. A portion of the Company’s sales are made through distributors for which the Company applies the same revenue recognition guidance described above. The Company defers the recognition of revenue when it receives consideration from the customers prior to the fulfillment of performance obligations. These amounts are classified as deferred revenue on the consolidated balance sheets. Of the recorded deferred revenue of $6,477 thousand as of December 31, 2018, $188 thousand and $1,750 thousand were recognized as revenue during the three and nine months ended September 30, 2019. Of the recorded deferred revenue of $8,335 thousand as of December 31, 2017, $2,256 thousand and $3,478 thousand were recognized as revenue during the three and nine months ended September 30, 2018, respectively. In accordance with revenue recognition guidance, any tax assessed by a governmental authority that is both imposed on and concurrent with a specific revenue-producing transaction, and that is collected by the Company from a customer, is excluded from revenue and presented in the statements of operations on a net basis. The Company provides warranties under which customers can return defective products. The Company also provides allowances for additional products that may have to be provided free of charge to compensate customers for not meeting previously agreed upon yield criteria, which the Company refers to as the low yield compensation reserve. The Company estimates the costs related to warranty claims, repair or replacements and low yield compensation reserves, and records them as components of cost of sales. In addition, the Company offers sales returns (other than those that relate to defective products under warranty), cash discounts for early payments, sales incentives including discounts and volume rebates, and certain allowances to the Company’s customers, including the Company’s distributors. The Company records reserves for those returns, discounts, incentives and allowances as a deduction from sales, based on historical experience and other quantitative and qualitative factors. Substantially all of the Company’s contracts are one year or less in duration. The standard payment terms with customers are generally thirty to sixty days from the time of shipment, product delivery to the customer’s location or customer acceptance, depending on the terms of the related arrangement. Unbilled accounts receivable represents the Company’s contractual right to consideration for manufacturing work performed on a customer contract or an individual purchase order, which has not been invoiced to the customer. Of the recorded unbilled accounts receivable of $38,181 thousand as of December 31, 2018, $2,993 thousand and $32,780 thousand were billed to customers upon shipment, upon product delivery or upon customer acceptance, depending on the terms of the related arrangement, during the three and nine months ended September 30, 2019, respectively.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In August 2018, the U.S. Securities and Exchange Commission (the “SEC”) adopted the final rule under SEC Release No. 33-10532, No. 33-10532, 33-10231 33-10442, 2019-07 No. 33-10532. 2019-07 In June 2016, the FASB issued ASU No. 2016-13, 2016-13”). 2016-13 No. 2019-04, 2019-04”) 2016-13 2019-04 2016-13 2019-04 In August 2018, the FASB issued Accounting Standards Update No. 2018-13 2018-13”). 2018-13 2018-13
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In February 2018, the FASB issued Accounting Standards Update No. 2018-02, 2018-02 In August 2017, the FASB issued Accounting Standards Update No. 2017-12, 2017-12”). 2017-12 2017-12 2017-12 In July 2017, the FASB issued Accounting Standards Update No. 2017-11, 2017-11”), 2017-11 In February 2016, the FASB issued Accounting Standards Update No. 2016-02, 2016-02”) 2016-02 right-of-use 2018-01, 2018-01”). 2018-01 2016-02 2018-10, 2018-10”). 2018-10 2018-11, 2018-11”). 2018-11 2016-02 2018-20, 2018-20”). 2018-20 2016-02. 2019-01 2019-01”) 2016-02, 2018-01, 2018-10, 2018-11, 2018-20 2019-01 The Company adopted the new lease standard as of January 1, 2019, using the modified retrospective transition method, which requires a cumulative effect adjustment, if any, to the Company’s beginning equity to be recognized on the date of adoption. There was no cumulative effect adjustment recorded on January 1, 2019. Accordingly, all periods prior to January 1, 2019, were presented in accordance with the previous FASB Accounting Standards Codification (“ASC”) Topic 840, Leases, and no retrospective adjustments were made to the comparative periods presented. The impact from the adoption was the balance sheet recognition of right-of-use

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories as of September 30, 2019 and December 31, 2018 consist of the following (in thousands): September 30, December 31, Finished goods $ 11,802 $ 14,334 Semi-finished goods and work-in-process 53,881 39,135 Raw materials 17,546 21,150 Materials in-transit 1,230 1,890 Less: inventory reserve (11,756 ) (4,898 ) Inventories, net $ 72,703 $ 71,611
Changes in Inventory Reserve	Changes in inventory reserve for the three and nine months ended September 30, 2019 and 2018 are as follows (in thousands): Three Months Nine Months Three Months Nine Months September 30, 2019 September 30, 2018 Beginning $ (12,253 ) $ (4,898 ) $ (4,699 ) $ (6,391 ) Change in reserve Inventory reserve charged to costs of sales (1,446 ) (11,552 ) (980 ) (4,104 ) Sale of previously reserved inventory 961 1,982 1,208 2,937 (485 ) (9,570 ) 228 (1,167 ) Write off 481 1,823 656 3,525 Translation adjustments 501 889 (35 ) 183 Ending balance $ (11,756 ) $ (11,756 ) $ (3,850 ) $ (3,850 )

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2019
Property, Plant and Equipment [Abstract]
Summary of Property, Plant and Equipment	Property, plant and equipment as of September 30, 2019 and December 31, 2018 are comprised of the following (in thousands): September 30, December 31, Buildings and related structures $ 65,933 $ 70,665 Machinery and equipment 312,758 323,325 Finance lease right-of-use 2,368 — Others 40,618 44,724 421,677 438,714 Less: accumulated depreciation (257,205 ) (251,962 ) Land 14,351 15,419 Property, plant and equipment, net $ 178,823 $ 202,171

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	Intangible assets as of September 30, 2019 and December 31, 2018 are comprised of the following (in thousands): September 30, 2019 Gross Accumulated Net Technology $ 18,010 $ (18,010 ) $ — Customer relationships 25,866 (25,866 ) — Intellectual property assets 11,672 (7,759 ) 3,913 Intangible assets, net $ 55,548 $ (51,635 ) $ 3,913 December 31, 2018 Gross Accumulated Net Technology $ 19,350 $ (19,350 ) $ — Customer relationships 27,791 (27,791 ) — Intellectual property assets 11,571 (7,618 ) 3,953 Intangible assets, net $ 58,712 $ (54,759 ) $ 3,953

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Supplemental Balance Sheet Information Related To Leases [Table Text Block]	Supplemental balance sheet information related to leases is as follows (in thousands): Leases Classification As of Assets Operating lease Operating lease right-of-use $ 11,517 Finance lease Property, plant and equipment, net 2,147 Total leased assets $ 13,664 Liabilities Current Operating Operating lease liabilities $ 2,023 Finance Other current liabilities 238 Non-current Operating Non-current 9,494 Finance Other non-current 1,961 Total lease liabilities $ 13,716
Lease, Cost [Table Text Block]	The components of lease cost included in the Company’s consolidated statements of operations, are as follows (in thousands): Three Months Nine Months September 30, 2019 Operating lease cos t $ 767 $ 2,395 Finance lease cost Amortization of right-of-use 74 228 Interest on lease liabilities 43 135 Total lease cost $ 884 $ 2,758
Other Lease Information [Table Text Block]	The above table does not include an immaterial cost of short-term leases and a variable lease payment during the three and nine months ended September 30, 2019. Other lease information is as follows (in thousands): Three Months Nine Months September 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 767 $ 2,395 Operating cash flows from finance leases 43 135 Financing cash flows from finance leases 56 174 As of September 30, Weighted average remaining lease term Operating leases 12.4 years Finance leases 10.5 years Weighted average remaining lease term Operating leases 7.96 % Finance leases 7.94 %
Schedule Of Future Minimum Lease Payments [Table Text Block]	The aggregate future lease payments for operating and finance leases as of September 30, 2019 are as follows (in thousands): Operating Finance 2019 $ 730 $ 100 2020 2,679 398 2021 1,306 398 2022 1,057 398 2023 1,048 398 Thereafter 11,281 1,555 Total future lease payments 18,101 3,247 Less: Present value adjustment (6,584 ) (1,048 ) Present value of future payments $ 11,517 $ 2,199
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	As of December 31, 2018, the minimum aggregate rental payments due under non-cancelable 2019 $ 4,319 2020 3,569 2021 1,570 2022 1,319 2023 1,309 2024 and thereafter 13,978 $ 26,064

Accrued Expenses (Tables)

Accrued Expenses (Tables)	9 Months Ended
	Sep. 30, 2019
Payables and Accruals [Abstract]
Summary of Accrued Expenses	Accrued expenses as of September 30, 2019 and December 31, 2018 are comprised of the following (in thousands): September 30, December 31, Payroll, benefits and related taxes, excluding severance benefits $ 18,523 $ 14,548 Withholding tax attributable to intercompany interest income 22,705 20,879 Interest on senior notes 3,444 8,226 Outside service fees 888 935 Others 3,384 1,662 Accrued expenses $ 48,944 $ 46,250

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Details of Derivative Contracts	Details of derivative contracts as of September 30, 2019 are as follows (in thousands): Date of transaction Type of derivative Total notional amount Month of settlement April 2, 2019 Zero cost collar $ 15,000 October 2019 to December 2019 April 9, 2019 Zero cost collar $ 15,000 October 2019 to December 2019 April 25, 2019 Zero cost collar $ 15,000 October 2019 to December 2019 August 13, 2019 Zero cost collar $ 60,000 January 2020 to June 2020 September 27, 2019 Zero cost collar $ 42,000 January 2020 to June 2020 Details of derivative contracts as of December 31, 2018 are as follows (in thousands): Date of transaction Type of derivative Total notional amount Month of settlement June 27, 2018 Zero cost collar $ 18,000 January 2019 to June 2019 June 27, 2018 Forward $ 36,000 January 2019 to June 2019
Fair Values of Outstanding Zero Cost Collar and Forward Contracts Recorded as Assets and Liabilities	The fair values of the Company’s outstanding zero cost collar and forward contracts recorded as assets and liabilities as of September 30, 2019 and December 31, 2018 are as follows (in thousands): Derivatives designated as hedging instruments: September 30, December 31, Asset Derivatives : Zero cost collar s Other current assets $ 13 $ — Liability Derivatives: Zero cost collars Other current liabilities $ 2,234 $ 117 Forward Other current liabilities $ — $ 607
Offsetting of Derivative Assets and Liabilities	Offsetting of derivative assets and liabilities as of September 30, 2019 is as follows (in thousands): As of September 30, 2019 Gross amounts of Gross amounts Net amounts of Gross amounts not offset Net amount Financial Cash collateral Asset Derivatives: Zero cost collars $ 13 $ — $ 13 $ — $ — $ 13 Liability Derivatives: Zero cost collars $ 2,234 $ — $ 2,234 $ — $ (590 ) $ 1,644
Offsetting of Derivative Liabilities	Offsetting of derivative liabilities as of December 31, 2018 is as follows (in thousands): As of December 31, 2018 Gross amounts of Gross amounts Net amounts of Gross amounts not offset Net amount Financial Cash collateral Liability Derivatives : Zero cost collars $ 117 $ — $ 117 $ — $ (360 ) $ (243 ) Forward $ 607 $ — $ 607 $ — $ (1,450 ) $ (843 )
Impact of Derivative Instruments on Consolidated Statement of Operations	The following table summarizes the impact of derivative instruments on the consolidated statements of operations for the three months ended September 30, 2019 and 2018 (in thousands): Derivatives in ASC 815 Cash Flow Hedging Relationships Amount of Gain (Loss) Location/Amount of Loss Into Statement of Operations Location/Amount of Gain (Loss) Three Months Ended Three Months Ended Three Months Ended 2019 2018 2019 2018 2019 2018 Zero cost collars $ (2,803 ) $ 386 Net sales $ (1,600 ) $ — Other income $ (33 ) $ 18 Forwards $ — $ 660 Net sales $ — $ (140 ) Other income $ — $ (102 ) Forwards—excluded time value (1) Other income $ — $ (434 ) $ (2,803 ) $ 1,046 $ (1,600 ) $ (140 ) $ (33 ) $ (518 ) Total Revenue $ 229,677 $ 206,000 The following table summarizes the impact of derivative instruments on the consolidated statement of operations for the nine months ended September 30, 2019 and 2018 (in thousands): Derivatives in ASC 815 Cash Flow Hedging Relationships Amount of Loss Location/Amount of Gain (Loss) Into Statement of Operations Location/Amount of Loss Nine Months Ended Nine Months Ended Nine Months Ended 2019 2018 2019 2018 2019 2018 Zero cost collars $ (3,905 ) $ (756 ) Net sales $ (1,803 ) $ 2,191 Other income $ (44 ) $ (300 ) Forwards $ (1,798 ) $ (135 ) Net sales $ (1,750 ) $ 2,310 Other income $ (125 ) $ (1,765 ) Forwards—excluded time value (1) Other income $ — $ (161 ) $ (5,703 ) $ (891 ) $ (3,553 ) $ 4,501 $ (169 ) $ (2,226 ) Total Revenue $ 592,202 $ 571,504 (1) The FASB issued the new guidance about hedging activities (ASU 2017-12),

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	As of September 30, 2019, the following table represents the Company’s assets and liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands): Carrying Value Fair Value Quoted Prices in Significant Significant Assets: Derivative assets (other current assets) $ 13 $ 13 — $ 13 — Liabilities: Derivative liabilities (other current liabilities) $ 2,234 $ 2,234 — $ 2,234 — As of December 31, 2018, the following table represents the Company’s liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands): Carrying Value Fair Value Quoted Prices in Significant Significant Liabilities: Derivative liabilities (other current liabilities) $ 724 $ 724 — $ 724 —
Schedule of Fair Value of Long-term Borrowings	Fair Value of Long-Term Borrowings September 30, 2019 December 31, 2018 Carrying Fair Carrying Fair (In thousands of US dollars) Long-term Borrowings : 5.0% Exchangeable Senior Notes due March 2021 (Level 2) $ 81,594 $ 116,078 $ 81,418 $ 86,835 6.625% Senior Notes due July 2021 (Level 2) $ 222,561 $ 219,765 $ 222,159 $ 202,046

Long-term Borrowings (Tables)

Long-term Borrowings (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Components of Long-term Borrowings	Long-term borrowings as of September 30, 2019 and December 31, 2018 are as follows (in thousands): September 30, December 31, 5.0 March 2021 $ 83,740 $ 84,660 6.625% Senior Notes due July 2021 $ 224,250 $ 224,500 Less: unamortized discount and debt issuance costs (3,835 ) (5,583 ) Long-term borrowings, net of unamortized discount and debt issuance costs $ 304,155 $ 303,577

Accrued Severance Benefits (Tab

Accrued Severance Benefits (Tables)	9 Months Ended
	Sep. 30, 2019
Postemployment Benefits [Abstract]
Changes in Accrued Severance Benefits	Changes in accrued severance benefits are as follows (in thousands): Three Months Ended Nine Months Ended Three Months Ended Nine Months Ended September 30, 2019 September 30, 2018 Beginning balance $ 146,261 $ 149,408 $ 146,375 $ 149,795 Provisions 4,085 10,491 5,521 14,686 Severance payments (1,616 ) (6,195 ) (3,250 ) (9,004 ) Translation adjustments (5,413 ) (10,387 ) 1,194 (5,637 ) 143,317 143,317 149,840 149,840 Less: Cumulative contributions to severance insurance deposit accounts (3,760 ) (3,760 ) (858 ) (858 ) The National Pension Fund (211 ) (211 ) (236 ) (236 ) Group severance insurance plan (552 ) (552 ) (598 ) (598 ) Accrued severance benefits, net $ 138,794 $ 138,794 $ 148,148 $ 148,148
Future Benefits Payments to Employees	The Company is liable to pay the following future benefits to its non-executive Severance benefit Remainder of 2019 $ 551 2020 1,018 2021 1,485 2022 1,243 2023 1,679 2024 2,531 2025 – 2029 33,706

Geographic and Segment Inform_2

Geographic and Segment Information (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Schedule of Operating Segments	The following sets forth information relating to the operating segments (in thousands): Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, Net Sales Foundry Services Group $ 90,340 $ 83,862 $ 220,513 $ 242,198 Standard Products Group Display Solutions 90,550 77,578 233,041 205,986 Power Solutions 48,690 44,458 138,443 123,153 Total Standard Products Group 139,240 122,036 371,484 329,139 All other 97 102 205 167 Total net sales $ 229,677 $ 206,000 $ 592,202 $ 571,504 Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, Gross Profit Foundry Services Group $ 25,547 $ 20,443 $ 41,361 $ 63,292 Standard Products Group 35,222 35,204 85,842 90,874 All other 97 102 204 18 Total gross profit $ 60,866 $ 55,749 $ 127,407 $ 154,184
Disaggregation Of Revenue Recognition	The Company’s revenue for Foundry Services Group is disaggregated depending on the timing of revenue recognition (in thousands): Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Revenue recognized Revenue Total Revenue recognized Revenue Total Net Sale s Foundry Services Group $ 43,328 $ 47,012 $ 90,340 $ 102,888 $ 117,625 $ 220,513 Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 Revenue recognized Revenue Total Revenue recognized Revenue Total Net Sales Foundry Services Group $ 26,257 $ 57,605 $ 83,862 $ 52,024 $ 190,174 $ 242,198
Net Sales by Region, Based on Location of Products are Billed	The following is a summary of net sales by geographic region, based on the location to which the products are billed (in thousands): Three Months Ended September 30, September 30, Korea $ 70,965 $ 91,570 Asia Pacific (other than Korea) 138,125 93,475 U.S.A. 7,182 5,831 Europe 12,916 14,444 Others 489 680 Total $ 229,677 $ 206,000 Nine Months Ended September 30, September 30, Korea $ 190,839 $ 204,319 Asia Pacific (other than Korea) 342,413 302,906 U.S.A. 20,784 29,242 Europe 36,935 33,041 Others 1,231 1,996 Total $ 592,202 $ 571,504

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Loss	Accumulated other comprehensive income (loss) consists of the following as of September 30, 2019 and December 31, 2018, respectively (in thousands): September 30, December 31, Foreign currency translation adjustments $ 10,854 $ (20,061 ) Derivative adjustments (2,199 ) (49 ) Total $ 8,655 $ (20,110 )
Changes in Accumulated Other Comprehensive Loss	Changes in accumulated other comprehensive income (loss) for the three months ended September 30, 2019 and 2018 are as follows (in thousands): Three Months Ended September 30, 2019 Foreign Derivative Total Beginning balanc e $ (5,077 ) $ (996 ) $ (6,073 ) Other comprehensive income (loss) before reclassifications 15,931 (2,803 ) 13,128 Amounts reclassified from accumulated other comprehensive loss — 1,600 1,600 Net current-period other comprehensive income (loss) 15,931 (1,203 ) 14,728 Ending balance $ 10,854 $ (2,199 ) $ 8,655 Three Months Ended September 30, 2018 Foreign Derivative Total Beginning balanc e $ (18,780 ) $ (1,279 ) $ (20,059 ) Other comprehensive income (loss) before reclassifications (3,827 ) 1,046 (2,781 ) Amounts reclassified from accumulated other comprehensive loss — 140 140 Net current-period other comprehensive income (loss ) (3,827 ) 1,186 (2,641 ) Ending balanc e $ (22,607 ) $ (93 ) $ (22,700 ) Changes in accumulated other comprehensive income (loss) for the nine months ended September 30, 2019 and 2018 are as follows (in thousands): Nine Months Ended September 30, 2019 Foreign Derivative Total Beginning balanc e $ (20,061 ) $ (49 ) $ (20,110 ) Other comprehensive income (loss) before reclassification s 30,915 (5,703 ) 25,212 Amounts reclassified from accumulated other comprehensive los s — 3,553 3,553 Net current-period other comprehensive income (loss ) 30,915 (2,150 ) 28,765 Ending balanc e $ 10,854 $ (2,199 ) $ 8,655 Nine Months Ended September 30, 201 8 Foreign Derivative Total Beginning balanc e $ (38,413 ) $ 5,299 $ (33,114 ) Other comprehensive income (loss) before reclassification s 15,806 (891 ) 14,915 Amounts reclassified from accumulated other comprehensive incom e — (4,501 ) (4,501 ) Net current-period other comprehensive income (loss ) 15,806 (5,392 ) 10,414 Ending balanc e $ (22,607 ) $ (93 ) $ (22,700 )

Earnings (Loss) per Share (Tabl

Earnings (Loss) per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Earnings (Loss) Per Common Share	The following table illustrates the computation of basic and diluted earnings (loss) per common share for the three and nine months ended September 30, 2019 and 2018: Three Months Ended September 30, September 30, (In thousands of US dollars, except share data) Basic Earnings (Loss) per Share Net income (loss) $ (1,607 ) $ 17,222 Basic weighted average common stock outstanding 34,357,745 34,573,377 Basic earnings (loss) per share $ (0.05 ) $ 0.50 Diluted Earnings (Loss) per Share Net income (loss) $ (1,607) $ 17,222 Add back: Interest expense on Exchangeable Notes — 1,422 Net income (loss) allocated to common stockholders $ (1,607 ) $ 18,644 Basic weighted average common stock outstanding 34,357,745 34,573,377 Net effect of dilutive equity awards — 1,000,020 Net effect of assumed conversion of 5.0% Exchangeable Notes to common stock — 10,448,213 Diluted weighted average common stock outstanding 34,357,745 46,021,610 Diluted earnings (loss) per share $ (0.05 ) $ 0.41 Nine Months Ended September 30, September 30, (In thousands of US dollars, except share data) Basic and Diluted Loss per Share Net loss $ (45,252 ) $ (1,520 ) Basic and diluted weighted average common stock outstanding 34,266,513 34,416,887 Basic and diluted loss per share $ (1.32 ) $ (0.04 )
Schedule of Antidilutive Securities Excluded from the Computation of Loss Per Common Share	The following outstanding instruments were excluded from the computation of diluted earnings (loss) per share, as they have an anti-dilutive effect on the calculation: Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, Options 2,479,423 723,117 2,479,423 2,684,558 Restricted Stock Units 592,967 — 592,967 581,759

Business, Basis of Presentati_3

Business, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)SegmentsBusinessLines	Sep. 30, 2018USD ($)	Jan. 01, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | Segments			2
'Adjustment to increase the assets and liabilities		$ 8,484		$ 8,484
Unbilled accounts receivable	$ 21,356		$ 21,356			$ 38,181
Payment terms			The standard payment terms with customers are generally thirty to sixty days from the time of shipment, product delivery to the customer’s location or customer acceptance, depending on the terms of the related arrangement.
Contract duration, description			Substantially all of the Company’s contracts are one year or less in duration.
Amounts billed to customers	2,993		$ 32,780
Deferred revenue	5,822		5,822			$ 6,477	$ 8,335
Deferred revenue recognized	$ 188	$ 2,256	$ 1,750	$ 3,478
Adjustments for New Accounting Pronouncement [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
'Adjustment to increase the assets and liabilities					$ 16,387
Minimum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Payment terms			30 days
Maximum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Payment terms			60 days
Contract duration			1 year
Standard Products Group [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of business lines | BusinessLines			2

Sales of Accounts Receivable _2

Sales of Accounts Receivable and Receivable Discount Program - Additional Information (Detail) - Trade Accounts Receivable [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of accounts receivable	$ 14,474	$ 17,156
Selling, General and Administrative Expenses [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-tax losses on accounts receivable	$ 45	$ 35

Inventories - Additional Inform

Inventories - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Legacy Display Products [Member]
Inventory reserves	$ 5,475

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Finished goods	$ 11,802		$ 14,334
Semi-finished goods and work-in-process	53,881		39,135
Raw materials	17,546		21,150
Materials in-transit	1,230		1,890
Less: inventory reserve	(11,756)	$ (12,253)	(4,898)	$ (3,850)	$ (4,699)	$ (6,391)
Inventories, net	$ 72,703		$ 71,611

Inventories - Changes in Invent

Inventories - Changes in Inventory Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Inventory Disclosure [Abstract]
Beginning balance	$ (12,253)	$ (4,699)	$ (4,898)	$ (6,391)
Change in reserve
Inventory reserve charged to costs of sales	(1,446)	(980)	(11,552)	(4,104)
Sale of previously reserved inventory	961	1,208	1,982	2,937
Change in reserve	(485)	228	(9,570)	(1,167)
Write off	481	656	1,823	3,525
Translation adjustments	501	(35)	889	183
Ending balance	$ (11,756)	$ (3,850)	$ (11,756)	$ (3,850)

Property, Plant and Equipment -

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 29, 2018	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Depreciation expenses		$ 23,994	$ 23,272
Water Treatment Facilities [Member]
Property, Plant and Equipment [Line Items]
Business acquisition, assets acquired and liabilities assumed, net	$ 4,172
Net proceeds from sale leaseback facility, financing activities	$ 4,172
Sale leaseback facility, financing activities, term	10 years
Business acquisition, other current liabilities	$ 553
Business acquisition, other non-current liabilities	$ 3,619

Property, Plant and Equipment_2

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 421,677	$ 438,714
Less: accumulated depreciation	(257,205)	(251,962)
Property, plant and equipment, net	178,823	202,171
Buildings and Related Structures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	65,933	70,665
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	312,758	323,325
Finance Lease Right Of Use Assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,368
Others [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,618	44,724
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 14,351	$ 15,419

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 667	$ 611

Intangible Assets - Summary of

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible asset, Gross amount	$ 55,548	$ 58,712
Accumulated amortization	(51,635)	(54,759)
Intangible asset, Net amount	3,913	3,953
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, Gross amount	18,010	19,350
Accumulated amortization	(18,010)	(19,350)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, Gross amount	25,866	27,791
Accumulated amortization	(25,866)	(27,791)
Intellectual Property Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, Gross amount	11,672	11,571
Accumulated amortization	(7,759)	(7,618)
Intangible asset, Net amount	$ 3,913	$ 3,953

Leases - Additional Information

Leases - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019
Maximum [Member]
Lease Agreements Remaining Term of Lease	15 years
Lessee Lease Option To Extend	10 years
Minimum [Member]
Lease Agreements Remaining Term of Lease	1 year
Lessee Lease Option To Extend	1 year

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Assets
Operating lease	$ 11,517
Total leased assets	13,664
Current
Operating	2,023
Non-current
Operating	9,494
Total lease liabilities	13,716
Operating Lease Right Of Use Assets [Member]
Assets
Operating lease	11,517
Property, Plant and Equipment, Net [Member]
Assets
Finance lease	2,147
Current Operating Lease Liabilities [Member]
Current
Operating	2,023
Other Current Liabilities [Member]
Current
Finance	238
Non Current Operating Lease Liabilities [Member]
Non-current
Operating	9,494
Other Noncurrent Liabilities [Member]
Non-current
Finance	$ 1,961

Leases - Components of lease co

Leases - Components of lease cost (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 767	$ 2,395
Finance lease cost [Abstract]
Amortization of right-of-use assets	74	228
Interest on lease liabilities	43	135
Total lease cost	$ 884	$ 2,758

Leases - Other lease informatio

Leases - Other lease information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 767	$ 2,395
Operating cash flows from finance leases	43	135
Financing cash flows from finance leases	$ 56	$ 174
Weighted average remaining lease term
Operating leases	12 years 4 months 24 days	12 years 4 months 24 days
Finance leases	10 years 6 months	10 years 6 months
Weighted average discount rate
Operating leases	7.96%	7.96%
Finance leases	7.94%	7.94%

Leases - Aggregate future lease

Leases - Aggregate future lease payment (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating Leases, 2019	$ 730
Operating Leases, 2020	2,679	$ 3,569
Operating Leases, 2021	1,306	1,570
Operating Leases, 2022	1,057	1,319
Operating Leases, 2023	1,048	1,309
Operating Leases, Thereafter	11,281	13,978
Operating Leases, Total future lease payments	18,101	$ 26,064
Less: Present value adjustment	(6,584)
Present value of future payments	11,517
Finance Leases [Abstract]
Finance Leases, 2019	100
Finance Leases, 2020	398
Finance Leases, 2021	398
Finance Leases, 2022	398
Finance Leases, 2023	398
Finance Leases, Thereafter	1,555
Finance Leases, Total future lease payments	3,247
Less: Present value adjustment	(1,048)
Present value of future payments	$ 2,199

Leases - Minimum aggregate rent

Leases - Minimum aggregate rental payments due (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
2019		$ 4,319
2020	$ 2,679	3,569
2021	1,306	1,570
2022	1,057	1,319
2023	1,048	1,309
2024 and thereafter	11,281	13,978
Operating Leases, Total future lease payments	$ 18,101	$ 26,064

Accrued Expenses - Summary of A

Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Payroll, benefits and related taxes, excluding severance benefits	$ 18,523	$ 14,548
Withholding tax attributable to intercompany interest income	22,705	20,879
Interest on senior notes	3,444	8,226
Outside service fees	888	935
Others	3,384	1,662
Accrued expenses	$ 48,944	$ 46,250

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Estimated amount reclassified from accumulated other comprehensive income into income, period				12 months
Estimated amount reclassified from accumulated other comprehensive income into income				$ 2,199
Revenues	$ 229,677		$ 206,000	592,202	$ 571,504
Accounting Standards Update 2014-09 [Member]
Derivative [Line Items]
Revenues		$ 98
Zero Cost Collar and Forward Contracts [Member] | Nomura Financial Investment (Korea) Co., Ltd. [Member]
Derivative [Line Items]
Deposit with counterparty	9,400			9,400		$ 4,000
Threshold amount of cash collateral	500			500
Cash collateral for credit exposure in derivatives	590			590		$ 1,810
Termination provisions for cash and cash equivalents	$ 30,000			$ 30,000
Debt Instrument, Credit Rating				B-/B3

Derivative Financial Instrume_4

Derivative Financial Instruments - Details of Derivative Contracts (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Zero Cost Collar One [Member]
Derivative [Line Items]
Date of transaction	Apr. 2, 2019	Jun. 27, 2018
Type of derivative	Zero cost collar	Zero cost collar
Total notional amount	$ 15,000	$ 18,000
Month of settlement, start	2019-10	2019-01
Month of settlement, end	2019-12	2019-06
Zero Cost Collar Two [Member]
Derivative [Line Items]
Date of transaction	Apr. 9, 2019
Type of derivative	Zero cost collar
Total notional amount	$ 15,000
Month of settlement, start	2019-10
Month of settlement, end	2019-12
Zero Cost Collar Three [Member]
Derivative [Line Items]
Date of transaction	Apr. 25, 2019
Type of derivative	Zero cost collar
Total notional amount	$ 15,000
Month of settlement, start	2019-10
Month of settlement, end	2019-12
Zero Cost Collar Four [Member]
Derivative [Line Items]
Date of transaction	Aug. 13, 2019
Type of derivative	Zero cost collar
Total notional amount	$ 60,000
Month of settlement, start	2020-01
Month of settlement, end	2020-06
Zero Cost Collar Five [Member]
Derivative [Line Items]
Date of transaction	Sep. 27, 2019
Type of derivative	Zero cost collar
Total notional amount	$ 42,000
Month of settlement, start	2020-01
Month of settlement, end	2020-06
Forward [Member]
Derivative [Line Items]
Date of transaction		Jun. 27, 2018
Type of derivative		Forward
Total notional amount		$ 36,000
Month of settlement, start		2019-01
Month of settlement, end		2019-06

Derivative Financial Instrume_5

Derivative Financial Instruments - Fair Values of Outstanding Zero Cost Collar and Forward Contracts Recorded as Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Zero Cost Collars [Member]
Asset Derivatives:
Other current assets	$ 13
Liability Derivatives:
Other current liabilities	2,234	$ 117
Forward [Member]
Liability Derivatives:
Other current liabilities		607
Other Current Assets [Member] | Zero Cost Collars [Member]
Asset Derivatives:
Other current assets	13
Other Current Liabilities [Member] | Zero Cost Collars [Member]
Liability Derivatives:
Other current liabilities	$ 2,234	117
Other Current Liabilities [Member] | Forward [Member]
Liability Derivatives:
Other current liabilities		$ 607

Derivative Financial Instrume_6

Derivative Financial Instruments - Offsetting of Derivative Assets and Liabilities (Details) - Zero Cost Collars [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Asset Derivatives:
Asset Derivatives, Gross amounts of recognized assets/liabilities	$ 13
Asset Derivatives, Gross amounts offset in the balance sheets	0
Asset Derivatives, Net amounts of assets/liabilities presented in the balance sheets	13
Asset Derivatives, Gross amounts not offset in the balance sheets, Financial instruments	0
Asset Derivatives, Gross amounts not offset in the balance sheets, Cash collateral pledged	0
Asset Derivatives, Net amount	13
Liability Derivatives:
Liability Derivatives, Gross amounts of recognized liabilities	2,234	$ 117
Liability Derivatives, Gross amounts offset in the balance sheets	0	0
Liability Derivatives, Net amounts of liabilities presented in the balance sheets	2,234	117
Liability Derivatives, Gross amounts not offset in the balance sheets, Financial instruments	0	0
Liability Derivatives, Gross amounts not offset in the balance sheets, Cash collateral pledged	(590)	360
Liability Derivatives, Net amount after master netting	$ 1,644	$ 243

Derivative Financial Instrume_7

Derivative Financial Instruments - Offsetting of Derivative Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Zero Cost Collars [Member]
Derivative [Line Items]
Liability Derivatives, Gross amounts of recognized liabilities	$ 2,234	$ 117
Liability Derivatives, Gross amounts offset in the balance sheets	0	0
Liability Derivatives, Net amounts of liabilities presented in the balance sheets	2,234	117
Liability Derivatives, Gross amounts not offset in the balance sheets, Financial instruments	0	0
Liability Derivatives, Gross amounts not offset in the balance sheets, Cash collateral pledged	590	(360)
Liability Derivatives, Net amount after master netting	$ (1,644)	(243)
Foreign Exchange Forward [Member]
Derivative [Line Items]
Liability Derivatives, Gross amounts of recognized liabilities		607
Liability Derivatives, Gross amounts offset in the balance sheets		0
Liability Derivatives, Net amounts of liabilities presented in the balance sheets		607
Liability Derivatives, Gross amounts not offset in the balance sheets, Financial instruments		0
Liability Derivatives, Gross amounts not offset in the balance sheets, Cash collateral pledged		(1,450)
Liability Derivatives, Net amount after master netting		$ (843)

Derivative Financial Instrume_8

Derivative Financial Instruments - Impact of Derivative Instruments on Consolidated Statement of Operations (Detail) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)	$ (2,803)	$ 1,046	$ (5,703)	$ (891)
Total Revenue	229,677	206,000	592,202	571,504
Other income (expense), net [Member]
Derivative [Line Items]
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)	(33)	(518)
Net Sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	(1,600)	(140)	(3,553)	4,501
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)			(169)	(2,226)
Zero Cost Collars [Member]
Derivative [Line Items]
Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)	(2,803)	386	(3,905)	(756)
Zero Cost Collars [Member] | Other income (expense), net [Member]
Derivative [Line Items]
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)	(33)	18	(44)	(300)
Zero Cost Collars [Member] | Net Sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	(1,600)	0	(1,803)	2,191
Forward [Member]
Derivative [Line Items]
Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)	0	660	(1,798)	(135)
Forward [Member] | Other income (expense), net [Member]
Derivative [Line Items]
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)	0	(102)	(125)	(1,765)
Forward [Member] | Net Sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	0	(140)	(1,750)	2,310
Forwards - excluded time value [Member] | Other income (expense), net [Member]
Derivative [Line Items]
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)	$ 0	$ (434)	$ 0	$ (161)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 17, 2017	Jul. 18, 2013	Sep. 30, 2019	Dec. 31, 2018	Feb. 28, 2019	Jan. 31, 2019	Sep. 30, 2018
6.625% Senior Notes Due 2021 [Member] | Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate		6.625%	6.625%	6.625%
Due date		Jul. 15, 2021	Jul. 1, 2021	Jul. 1, 2021
Aggregate principal amount		$ 225,000
Debt issuance costs paid		5,039
Original debt issue discount		$ 1,125
Principal Repurchase Amount Of Exchangeable Notes				$ 500		$ 250
5.0% Exchangeable Senior Notes due March 2021 [Member] | Exchangeable Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate	5.00%		5.00%	5.00%			5.00%
Due date	Mar. 1, 2021		Mar. 1, 2021	Mar. 1, 2021
Aggregate principal amount	$ 86,250
Debt issuance costs paid	$ 5,902		$ 5,902
Principal Repurchase Amount Of Exchangeable Notes				$ 1,590	$ 920
Other Asset Class [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value on non-recurring basis			0				$ 0
Liabilities fair value on non-recurring basis			$ 0				$ 0

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Carrying Value [Member] | Other Current Assets [Member]
Assets:
Derivative assets	$ 13
Carrying Value [Member] | Other Current Liabilities [Member]
Liabilities:
Derivative liabilities	2,234	$ 724
Estimate of Fair Value Measurement [Member] | Other Current Assets [Member]
Assets:
Derivative assets	13
Estimate of Fair Value Measurement [Member] | Other Current Liabilities [Member]
Liabilities:
Derivative liabilities	2,234	724
Significant Other Observable Inputs (Level 2) [Member] | Other Current Assets [Member]
Assets:
Derivative assets	13
Significant Other Observable Inputs (Level 2) [Member] | Other Current Liabilities [Member]
Liabilities:
Derivative liabilities	$ 2,234	$ 724

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Long-term Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Long-term Borrowings:
Carrying amount of senior notes	$ 304,155	$ 303,577
5.0% Exchangeable Senior Notes due March 2021 [Member] | Exchangeable Senior Notes [Member] | Significant Other Observable Inputs (Level 2) [Member]
Long-term Borrowings:
Carrying amount of senior notes	81,594	81,418
Estimated fair value of senior notes	116,078	86,835
6.625% Senior Notes Due 2021 [Member] | Senior Notes [Member] | Significant Other Observable Inputs (Level 2) [Member]
Long-term Borrowings:
Carrying amount of senior notes	222,561	222,159
Estimated fair value of senior notes	$ 219,765	$ 202,046

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Fair Value of Long-term Borrowings (Parenthetical) (Detail)	Jan. 17, 2017	Jul. 18, 2013	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
5.0% Exchangeable Senior Notes due March 2021 [Member] | Exchangeable Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	5.00%		5.00%	5.00%	5.00%
Due date	Mar. 1, 2021		Mar. 1, 2021	Mar. 1, 2021
6.625% Senior Notes Due 2021 [Member] | Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate		6.625%	6.625%	6.625%
Due date		Jul. 15, 2021	Jul. 1, 2021	Jul. 1, 2021

Long-Term Borrowings - Addition

Long-Term Borrowings - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jan. 17, 2017	Jan. 17, 2017	Jul. 18, 2013	Feb. 28, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Jan. 31, 2019
Debt Instrument [Line Items]
Repurchase of common stock, shares										1,795,444
Repurchase of common stock							$ 2,588	$ 199		$ 11,401
Interest expense related to the Exchangeable Notes						1,422
Loss on early extinguishment of long-term borrowings, net							$ (42)
6.625% Senior Notes Due 2021 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount			$ 225,000
Interest rate			6.625%		6.625%		6.625%		6.625%
Due date			Jul. 15, 2021				Jul. 1, 2021		Jul. 1, 2021
Aggregate principal amount of senior notes pricing			99.50%
Debt issuance costs paid			$ 5,039
Interest expense related to the Exchangeable Notes					$ 3,935	$ 3,933	$ 11,794	$ 11,785
Original debt issue discount			$ 1,125
Debt Instrument, Repurchased Face Amount									$ 500		$ 250
Loss on early extinguishment of long-term borrowings, net							$ 21		$ 28
6.625% Senior Notes Due 2021 [Member] | Senior Notes [Member] | 2019 [Member]
Debt Instrument [Line Items]
Redemption price plus accrued, unpaid interest and special interest to the date of redemption							100.00%
5.0% Exchangeable Senior Notes due March 2021 [Member] | Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 86,250	$ 86,250
Interest rate	5.00%	5.00%			5.00%	5.00%	5.00%	5.00%	5.00%
Due date	Mar. 1, 2021						Mar. 1, 2021		Mar. 1, 2021
Aggregate principal amount of senior notes pricing		5.00%
Convertible notes principal amount denomination value							$ 1,000
Conversion of converted notes, shares issued							121.1387
Exchange price					$ 8.26		$ 8.26
Redemption price plus accrued, unpaid interest and special interest to the date of redemption							100.00%
Minimum required percentage of holders to declare repurchase of notes							25.00%
Percentage of notes to repurchased on declaration by minimum required holders							100.00%
Debt issuance costs paid	$ 5,902						$ 5,902
Interest expense related to the Exchangeable Notes					$ 1,404	$ 1,422	$ 4,206	$ 4,251
Debt Instrument, Repurchased Face Amount				$ 920					$ 1,590
Loss on early extinguishment of long-term borrowings, net				$ 63					$ 234

Long-term Borrowings - Componen

Long-term Borrowings - Components of Long-term Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Less: unamortized discount and debt issuance costs	$ (3,835)	$ (5,583)
Long-term borrowings, net of unamortized discount and debt issuance costs	304,155	303,577
Exchangeable Senior Notes [Member] | 5.0% Exchangeable Senior Notes due March 2021 [Member]
Debt Instrument [Line Items]
Long-term borrowings	83,740	84,660
Senior Notes [Member] | 6.625% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 224,250	$ 224,500

Long-term Borrowings - Compon_2

Long-term Borrowings - Components of Long-term Borrowings (Parenthetical) (Detail)	Jan. 17, 2017	Jul. 18, 2013	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
5.0% Exchangeable Senior Notes due March 2021 [Member] | Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate	5.00%		5.00%	5.00%	5.00%
Due date	Mar. 1, 2021		Mar. 1, 2021	Mar. 1, 2021
6.625% Senior Notes Due July 2021 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate		6.625%	6.625%	6.625%
Due date		Jul. 15, 2021	Jul. 1, 2021	Jul. 1, 2021

Accrued Severance Benefits - Ad

Accrued Severance Benefits - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019
Percentage of employees eligible for severance benefits	98.00%
Korea [Member] | Maximum [Member]
Retirement age of employees	60 years

Accrued Severance Benefits - Ch

Accrued Severance Benefits - Changes in Accrued Severance Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Postemployment Benefits [Abstract]
Beginning balance	$ 146,261	$ 146,375	$ 149,408	$ 149,795
Provisions	4,085	5,521	10,491	14,686
Severance payments	(1,616)	(3,250)	(6,195)	(9,004)
Translation adjustments	(5,413)	1,194	(10,387)	(5,637)
Ending balance	143,317	149,840	143,317	149,840
Less: Cumulative contributions to severance insurance deposit accounts	(3,760)	(858)	(3,760)	(858)
The National Pension Fund	(211)	(236)	(211)	(236)
Group severance insurance plan	(552)	(598)	(552)	(598)
Accrued severance benefits, net	$ 138,794	$ 148,148	$ 138,794	$ 148,148	$ 146,031

Accrued Severance Benefits - Fu

Accrued Severance Benefits - Future Benefits Payments to Employees (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Retirement Benefits [Abstract]
Remainder of 2019	$ 551
2020	1,018
2021	1,485
2022	1,243
2023	1,679
2024	2,531
2025 - 2029	$ 33,706

Foreign Currency Gain (Loss),_2

Foreign Currency Gain (Loss), Net - Additional Information (Detail) $ in Thousands	Sep. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Foreign Currency Transaction [Abstract]
Exchange rates using first base rate	1,201.3	1,118.1
Intercompany loan balances	$ 679,585	$ 666,597

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Income tax expenses (benefits)	$ 1,454	$ 1,608	$ 3,107	$ 4,119
Statutory income tax rate			21.00%		35.00%
Korean Subsidiary [Member]
Income Tax Contingency [Line Items]
The net operating income carry forwards of the taxable income	60.00%	70.00%	60.00%	70.00%

Geographic and Segment Inform_3

Geographic and Segment Information - Additional Information (Detail) - Segments	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments			2
Customer Concentration Risk [Member] | Net Sales [Member] | Top Ten Customers [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	69.00%	65.00%	68.00%	62.00%
Customer Concentration Risk [Member] | Net Sales [Member] | Top Customer One [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	34.00%	18.80%	33.00%	21.60%
Customer Concentration Risk [Member] | Net Sales [Member] | Top Customer Two [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		17.60%		13.00%
Geographic Concentration Risk [Member] | Net Sales [Member] | Asia Pacific Other Than Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	73.40%		75.90%
Geographic Concentration Risk [Member] | Net Sales [Member] | Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	22.30%	29.70%	20.40%	25.80%
Geographic Concentration Risk [Member] | Net Sales [Member] | CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		64.10%		67.60%
Geographic Concentration Risk [Member] | Property, Plant and Equipment [Member] | Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			98.00%

Geographic and Segment Inform_4

Geographic and Segment Information - Schedule of Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total net sales	$ 229,677	$ 206,000	$ 592,202	$ 571,504
Total gross profit	60,866	55,749	127,407	154,184
Foundry Services Group [Member]
Segment Reporting Information [Line Items]
Total net sales	90,340	83,862	220,513	242,198
Operating Segments [Member] | Foundry Services Group [Member]
Segment Reporting Information [Line Items]
Total net sales	90,340	83,862	220,513	242,198
Total gross profit	25,547	20,443	41,361	63,292
Operating Segments [Member] | Standard Products Group [Member]
Segment Reporting Information [Line Items]
Total net sales	139,240	122,036	371,484	329,139
Total gross profit	35,222	35,204	85,842	90,874
Operating Segments [Member] | Standard Products Group [Member] | Display Solutions [Member]
Segment Reporting Information [Line Items]
Total net sales	90,550	77,578	233,041	205,986
Operating Segments [Member] | Standard Products Group [Member] | Power Solutions [Member]
Segment Reporting Information [Line Items]
Total net sales	48,690	44,458	138,443	123,153
All Other [Member]
Segment Reporting Information [Line Items]
Total net sales	97	102	205	167
Total gross profit	$ 97	$ 102	$ 204	$ 18

Geographic and Segment Inform_5

Geographic and Segment Information - Summary of Revenue Disaggregated Depending on Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Foundry Services Group	$ 229,677	$ 206,000	$ 592,202	$ 571,504
Foundry Services Group [Member]
Disaggregation of Revenue [Line Items]
Foundry Services Group	90,340	83,862	220,513	242,198
Revenue Recognized At The Time Of Shipment Or Delivery [Member] | Foundry Services Group [Member]
Disaggregation of Revenue [Line Items]
Foundry Services Group	43,328	26,257	102,888	52,024
Revenue Recognized Over Time [Member] | Foundry Services Group [Member]
Disaggregation of Revenue [Line Items]
Foundry Services Group	$ 47,012	$ 57,605	$ 117,625	$ 190,174

Geographic and Segment Inform_6

Geographic and Segment Information - Net Sales by Region, Based on Location of Products are Billed (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	$ 229,677	$ 206,000	$ 592,202	$ 571,504
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	70,965	91,570	190,839	204,319
Asia Pacific (Other Than Korea) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	138,125	93,475	342,413	302,906
U.S.A. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	7,182	5,831	20,784	29,242
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	12,916	14,444	36,935	33,041
Others [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	$ 489	$ 680	$ 1,231	$ 1,996

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Equity [Abstract]
Income tax related to accumulated other comprehensive loss	$ 0	$ 0

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Equity [Abstract]
Foreign currency translation adjustments	$ 10,854	$ (20,061)
Derivative adjustments	(2,199)	(49)
Total	$ 8,655	$ (20,110)

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	$ (47,916)	$ (33,793)	$ (17,310)	$ (39,637)
Total other comprehensive income (loss)	14,728	(2,641)	28,765	10,414
Balance ending	(33,427)	(17,452)	(33,427)	(17,452)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(5,077)	(18,780)	(20,061)	(38,413)
Other comprehensive income (loss) before reclassifications	15,931	(3,827)	30,915	15,806
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive income (loss)	15,931	(3,827)	30,915	15,806
Balance ending	10,854	(22,607)	10,854	(22,607)
Derivative Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(996)	(1,279)	(49)	5,299
Other comprehensive income (loss) before reclassifications	(2,803)	1,046	(5,703)	(891)
Amounts reclassified from accumulated other comprehensive loss	1,600	140	3,553	(4,501)
Total other comprehensive income (loss)	(1,203)	1,186	(2,150)	(5,392)
Balance ending	(2,199)	(93)	(2,199)	(93)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(6,073)	(20,059)	(20,110)	(33,114)
Other comprehensive income (loss) before reclassifications	13,128	(2,781)	25,212	14,915
Amounts reclassified from accumulated other comprehensive loss	1,600	140	3,553	(4,501)
Total other comprehensive income (loss)	14,728	(2,641)	28,765	10,414
Balance ending	$ 8,655	$ (22,700)	$ 8,655	$ (22,700)

Earnings (Loss) per Share - Add

Earnings (Loss) per Share - Additional Information (Detail) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Conversion Of Exchangeable Notes	10,144,155	10,156,810	10,448,213

Earnings (Loss) per Share - Sch

Earnings (Loss) per Share - Schedule of Computation of Basic and Diluted Earnings (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic Earnings (Loss) per Share
Net income (loss)	$ (1,607)	$ 17,222	$ (45,252)	$ (1,520)
Basic weighted average common stock outstanding	34,357,745	34,573,377	34,266,513	34,416,887
Basic earnings (loss) per share	$ (0.05)	$ 0.50	$ (1.32)	$ (0.04)
Diluted Earnings (Loss) per Share
Net income (loss)	$ (1,607)	$ 17,222	$ (45,252)	$ (1,520)
Add back: Interest expense on Exchangeable Notes		1,422
Net income (loss) allocated to common stockholders	$ (1,607)	$ 18,644
Basic weighted average common stock outstanding	34,357,745	34,573,377	34,266,513	34,416,887
Net effect of dilutive equity awards		1,000,020
Net effect of assumed conversion of 5.0% Exchangeable Notes to common stock		10,448,213
Diluted weighted average common stock outstanding	34,357,745	46,021,610	34,266,513	34,416,887
Diluted earnings (loss) per share	$ (0.05)	$ 0.41	$ (1.32)	$ (0.04)
Net loss	$ (1,607)	$ 17,222	$ (45,252)	$ (1,520)
Basic and diluted weighted average common stock outstanding			34,266,513	34,416,887
Basic and diluted loss per share			$ (1.32)	$ (0.04)

Earnings (Loss) per Share - S_2

Earnings (Loss) per Share - Schedule of Computation of Basic and Diluted Earnings (Loss) Per Common Share (Parenthetical) (Detail)	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jan. 17, 2017
5.0% Exchangeable Senior Notes due March 2021 [Member] | Exchangeable Senior Notes [Member]
Earnings Per Share [Line Items]
Conversion of exchangeable notes to common stock rate	5.00%	5.00%	5.00%	5.00%

Earnings (Loss) per Share - S_3

Earnings (Loss) per Share - Schedule of Antidilutive Securities Excluded from the Computation of Loss Per Common Share (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted loss per share/unit	10,144,155		10,156,810	10,448,213
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted loss per share/unit	2,479,423	723,117	2,479,423	2,684,558
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted loss per share/unit	592,967		592,967	581,759

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Other Current Assets [Member]
Loss Contingencies [Line Items]
Prepayments to suppliers	$ 5,847	$ 8,132