Stoneridge (SRI) 10-Q 4 Aug 21 2021 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 30, 2021
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2021
Entity File Number	001-13337
Entity Registrant Name	STONERIDGE INC
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	34-1598949
Entity Address, Address Line One	39675 MacKenzie Drive, Suite 400
Entity Address, City or Town	Novi
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48377
City Area Code	248
Local Phone Number	489-9300
Title of 12(g) Security	Common Shares
Trading Symbol	SRI
Amendment Flag	false
Security Exchange Name	NYSE
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 Shell Company	false
Entity Common Stock Shares Outstanding		27,163,551
Entity Central Index Key	0001043337
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 55,587	$ 73,919
Accounts receivable, less reserves of $3,506, and $817, respectively	153,204	136,745
Inventories, net	114,810	90,548
Prepaid expenses and other current assets	38,808	33,452
Total current assets	362,409	334,664
Long-term assets:
Property, plant and equipment, net	112,055	119,324
Intangible assets, net	55,349	55,394
Goodwill	37,954	39,104
Operating lease right-of-use asset	16,780	18,944
Investments and other long-term assets, net	51,385	53,978
Total long-term assets	273,523	286,744
Total assets	635,932	621,408
Current liabilities:
Current portion of debt	4,455	7,673
Accounts payable	97,088	86,103
Accrued expenses and other current liabilities	61,937	52,272
Total current liabilities	163,480	146,048
Long-term liabilities:
Revolving credit facility	126,000	136,000
Deferred income taxes	11,854	12,935
Operating lease long-term liability	13,716	15,434
Other long-term liabilities	7,252	14,357
Total long-term liabilities	158,822	178,726
Shareholders' equity:
Preferred Shares, without par value, 5,000 shares authorized, none issued
Common Shares, without par value, 60,000 shares authorized, 28,966 and 28,966 shares issued and 27,164 and 27,006 shares outstanding at June 30, 2021 and December 31, 2020, respectively, with no stated value
Additional paid-in capital	230,430	234,409
Common Shares held in treasury, 1,802 and 1,960 shares at June 30, 2021 and December 31, 2020, respectively, at cost	(56,086)	(60,482)
Retained earnings	232,270	212,342
Accumulated other comprehensive loss	(92,984)	(89,635)
Total shareholders' equity	313,630	296,634
Total liabilities and shareholders' equity	$ 635,932	$ 621,408

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts receivable, reserves (in dollars)	$ 1,603	$ 817
Preferred shares, no par value	$ 0	$ 0
Preferred shares, authorized	5,000,000	5,000,000
Preferred shares, issued	0	0
Common shares, no par value	$ 0	$ 0
Common shares, authorized	60,000,000	60,000,000
Common shares, issued	28,966,000	28,966,000
Common shares, outstanding	27,164,000	27,006,000
Common shares held in treasury, shares	1,802,000	1,960,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 191,334	$ 99,545	$ 385,129	$ 282,511
Costs and expenses:
Cost of goods sold	148,493	86,291	296,202	223,860
Selling, general and administrative	31,380	27,693	60,756	57,196
Gain on disposal of Canton Facility, net	(30,718)		(30,718)
Design and development	15,495	12,384	30,146	24,619
Operating income	26,684	(26,823)	28,743	(23,164)
Interest expense, net	1,860	1,410	3,626	2,440
Equity in loss (earnings) of investee	(496)	231	(1,110)	(226)
Other income , net	(272)	(9)	86	(1,626)
(Loss) income before income taxes	25,592	(28,455)	26,141	(23,752)
(Benefit) provision for income taxes	5,794	(6,721)	6,213	(5,508)
Net (loss) income	$ 19,798	$ (21,734)	$ 19,928	$ (18,244)
(Loss) earnings per share:
Basic (in dollars per share)	$ 0.73	$ (0.81)	$ 0.74	$ (0.67)
Diluted (in dollars per share)	$ 0.72	$ (0.81)	$ 0.73	$ (0.67)
Weighted-average shares outstanding:
Basic (in shares)	27,137,207	26,952,336	27,077,152	27,092,186
Diluted (in shares)	27,432,417	26,952,336	27,441,996	27,092,186

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income		$ 19,798	$ (21,734)	$ 19,928	$ (18,244)
Other comprehensive income (loss), net of tax:
Foreign currency translation		7,172	1,821	(3,606)	(15,298)
Unrealized (loss) gain on derivatives (1)	[1]	386	1,210	257	(2,445)
Other comprehensive income (loss), net of tax		7,558	3,031	(3,349)	(17,743)
Comprehensive (loss) income		$ 27,356	$ (18,703)	$ 16,579	$ (35,987)
[1]	Net of tax expense of $103 and $322 for the three months ended June 30, 2021 and 2020, respectively. Net of tax expense (benefit) of $68 and $(650) for the six months ended June 30, 2021 and 2020, respectively.

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Tax (benefit) expense	$ 103	$ 322	$ 68	$ (650)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES:
Net (loss) income	$ 19,928	$ (18,244)
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Depreciation	14,099	13,242
Amortization, including accretion and write-off of deferred financing costs	3,126	2,732
Deferred income taxes	1,658	(7,018)
Earnings of equity method investee	(1,110)	(87)
Loss (gain) on sale of fixed assets	(139)	131
Share-based compensation expense	2,761	2,110
Excess tax benefit related to share-based compensation expense	(289)	40
Gain on disposal	(30,718)
Gain on disposal of business, net	(740)
Property, plant and equipment impairment charge		2,326
Change in fair value of earn-out contingent consideration	1,215	(233)
Changes in operating assets and liabilities:
Accounts receivable, net	(17,175)	37,644
Inventories, net	(24,750)	(6,295)
Prepaid expenses and other assets	(3,084)	992
Accounts payable	13,610	(26,044)
Accrued expenses and other liabilities	(1,033)	(7,829)
Net cash provided by operating activities	(22,641)	(6,533)
INVESTING ACTIVITIES:
Capital expenditures, including intangibles	(14,043)	(17,194)
Proceeds from sale of fixed assets	474	19
Proceeds from disposal of business, net	1,050
Proceeds from sale of Canton Facility, net	35,167
Investment in venture capital fund, net	(1,599)	(750)
Net cash used for investing activities	21,049	(17,925)
FINANCING ACTIVITIES:
Revolving credit facility borrowings	30,000	71,500
Revolving credit facility payments	(40,000)	(36,500)
Proceeds from issuance of debt	21,888	17,345
Repayments of debt	(25,082)	(16,242)
Common Share repurchase program		(4,995)
Repurchase of Common Shares to satisfy employee tax withholding	(2,349)	(1,741)
Net cash provided by (used for) financing activities	(15,543)	29,367
Effect of exchange rate changes on cash and cash equivalents	(1,197)	(1,900)
Net change in cash and cash equivalents	(18,332)	3,009
Cash and cash equivalents at beginning of period	73,919	69,403
Cash and cash equivalents at end of period	55,587	72,412
Supplemental disclosure of cash flow information:
Cash paid for interest	3,468	2,344
Cash paid for income taxes, net	$ 6,645	$ 636

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands		Number of Common Shares outstanding	Treasury shares	Additional Paid-In Capital	Common Shares held in treasury	Retained earnings	Accumulated other comprehensive loss	Cumulative Effect, Period of Adoption, Adjustment [Member]	Total
Balance at Dec. 31, 2019				$ 225,607	$ (50,773)	$ 206,542	$ (91,472)		$ 289,904
Common Stock, Share, Beginning Balance (in shares) at Dec. 31, 2019		27,408
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2019			1,558
Net income (loss)						3,490			3,490
Unrealized gain (loss) on derivatives, net							(3,655)		(3,655)
Currency translation adjustments							(17,119)		(17,119)
Issuance of Common Shares ( in shares)		267
Issuance of Common Shares ( in treasury shares)			(267)
Repurchased Common Shares for treasury, net					4,769				4,769
Repurchased Common Shares for treasury (in shares)		(75)
Repurchased Common Shares for treasury (in treasury shares)			75
Common Share repurchase program				10,000	(14,995)				(4,995)
Common Share repurchase program (in shares)		(607)
Common Share repurchase program (in treasury shares)			607
Share-based compensation				(5,101)					(5,101)
Balance at Mar. 31, 2020				230,506	(60,999)	210,032	(112,246)		267,293
Common Stock, Share, Ending Balance (in shares) at Mar. 31, 2020		26,993
Treasury Stock, Shares, Ending Balance at Mar. 31, 2020			1,973
Balance at Dec. 31, 2019				225,607	(50,773)	206,542	(91,472)		289,904
Common Stock, Share, Beginning Balance (in shares) at Dec. 31, 2019		27,408
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2019			1,558
Net income (loss)									(18,244)
Unrealized gain (loss) on derivatives, net	[1]								(2,445)
Balance at Jun. 30, 2020				230,818	(60,639)	188,298	(109,215)		249,262
Common Stock, Share, Ending Balance (in shares) at Jun. 30, 2020		27,001
Treasury Stock, Shares, Ending Balance at Jun. 30, 2020			1,965
Balance at Mar. 31, 2020				230,506	(60,999)	210,032	(112,246)		267,293
Common Stock, Share, Beginning Balance (in shares) at Mar. 31, 2020		26,993
Treasury Stock, Shares, Beginning Balance at Mar. 31, 2020			1,973
Net income (loss)						(21,734)			(21,734)
Unrealized gain (loss) on derivatives, net							1,210		1,210	[1]
Currency translation adjustments							1,821		1,821
Issuance of Common Shares ( in shares)		12
Issuance of Common Shares ( in treasury shares)			(12)
Repurchased Common Shares for treasury, net					360				360
Repurchased Common Shares for treasury (in shares)		(4)
Repurchased Common Shares for treasury (in treasury shares)			4
Share-based compensation				312					312
Balance at Jun. 30, 2020				$ 230,818	(60,639)	188,298	(109,215)		249,262
Common Stock, Share, Ending Balance (in shares) at Jun. 30, 2020		27,001
Treasury Stock, Shares, Ending Balance at Jun. 30, 2020			1,965
Balance at Dec. 31, 2020		$ 27,006			(60,482)	212,342	(89,635)	$ 13,750	$ 296,634
Common Stock, Share, Beginning Balance (in shares) at Dec. 31, 2020			1,960						27,006
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2020				234,409					1,960
Net income (loss)						130			$ 130
Unrealized gain (loss) on derivatives, net							(129)		(129)
Currency translation adjustments							(10,778)		(10,778)
Issuance of Common Shares ( in shares)		224
Issuance of Common Shares ( in treasury shares)			(224)
Repurchased Common Shares for treasury, net					4,392				4,392
Repurchased Common Shares for treasury (in shares)		(68)
Repurchased Common Shares for treasury (in treasury shares)			68
Share-based compensation				$ (5,577)					(5,577)
Balance at Mar. 31, 2021				$ 228,832	(56,090)	212,472	(100,542)		284,672
Common Stock, Share, Ending Balance (in shares) at Mar. 31, 2021		27,162
Treasury Stock, Shares, Ending Balance at Mar. 31, 2021			1,804
Balance at Dec. 31, 2020		$ 27,006			(60,482)	212,342	(89,635)	$ 13,750	$ 296,634
Common Stock, Share, Beginning Balance (in shares) at Dec. 31, 2020			1,960						27,006
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2020				234,409					1,960
Net income (loss)									$ 19,928
Unrealized gain (loss) on derivatives, net	[1]								257
Balance at Jun. 30, 2021				$ 230,430	(56,086)	232,270	(92,984)		$ 313,630
Common Stock, Share, Ending Balance (in shares) at Jun. 30, 2021		27,164							27,164
Treasury Stock, Shares, Ending Balance at Jun. 30, 2021			1,802						1,802
Balance at Mar. 31, 2021				228,832	(56,090)	212,472	(100,542)		$ 284,672
Common Stock, Share, Beginning Balance (in shares) at Mar. 31, 2021		27,162
Treasury Stock, Shares, Beginning Balance at Mar. 31, 2021			1,804
Net income (loss)						19,798			19,798
Unrealized gain (loss) on derivatives, net							386		386	[1]
Currency translation adjustments							7,172		7,172
Issuance of Common Shares ( in shares)		2
Issuance of Common Shares ( in treasury shares)			(2)
Repurchased Common Shares for treasury, net					4				4
Share-based compensation				1,598					1,598
Balance at Jun. 30, 2021				$ 230,430	$ (56,086)	$ 232,270	$ (92,984)		$ 313,630
Common Stock, Share, Ending Balance (in shares) at Jun. 30, 2021		27,164							27,164
Treasury Stock, Shares, Ending Balance at Jun. 30, 2021			1,802						1,802
[1]	Net of tax expense of $103 and $322 for the three months ended June 30, 2021 and 2020, respectively. Net of tax expense (benefit) of $68 and $(650) for the six months ended June 30, 2021 and 2020, respectively.

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2021
Basis of Presentation [Abstract]
Basis of Presentation	(1) Basis of Presentation The accompanying condensed consolidated financial statements have been prepared by Stoneridge, Inc. (the “Company”) without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). The information furnished in the condensed consolidated financial statements includes normal recurring adjustments and reflects all adjustments, which are, in the opinion of management, necessary for a fair presentation of such financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations. The results of operations for the three and six months ended June 30, 2021 are not necessarily indicative of the results to be expected for the full year. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s 2020 Form 10-K The Company’s investment in Minda Stoneridge Instruments Ltd. (“MSIL”) for the three and six months ended June 30, 2021 and 2020 has been determined to be an unconsolidated entity, and therefore is accounted for under the equity method of accounting based on the Company’s 49% ownership in MSIL.

Recently Issued Accounting Stan

Recently Issued Accounting Standards	6 Months Ended
	Jun. 30, 2021
Recently Issued Accounting Standards [Abstract]
Recently Issued Accounting Standards	(2) Recently Issued Accounting Standards Recently Adopted Accounting Standards In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” The amendments in this update remove certain exceptions of Topic 740 including: exception to the incremental approach for intraperiod tax allocation when there is a loss from continuing operations and income or gain from other items; exception to the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment; exception to the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary; exception to the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. There are also additional areas of guidance in regards to: franchise and other taxes partially based on income and the interim recognition of enactment of tax laws and rate changes. The provisions of this ASU are effective for years beginning after December 15, 2020, with early adoption permitted. The Company adopted this standard prospectively as of January 1, 2020 using the modified retrospective basis. The impact of the adoption was a reduction to deferred tax liabilities and an increase to retained earnings of $13,750 on the condensed consolidated balance sheet as of December 31, 2020. The adoption of this standard did not have an impact on the Company’s condensed consolidated results of operations and cash flows. ​ In August 2018, the FASB issued ASU 2018-15, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” The guidance in ASU 2018-15 clarifies the accounting for implementation costs in cloud computing arrangements. ASU 2018-15 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2019. The Company adopted this standard prospectively as of January 1, 2020 and it did not have a material impact on the Company’s condensed consolidated financial statements. ​ In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820) – Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” The guidance in ASU 2018-13 changes disclosure requirements related to fair value measurements as part of the disclosure framework project. The disclosure framework project aims to improve the effectiveness of disclosures in the notes to the financial statements by focusing on requirements that clearly communicate the most important information to users of the financial statements. This guidance is effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted this standard as of January 1, 2020 and it did not have a material impact on the Company’s condensed consolidated financial statements. ​ In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments”, which requires measurement and recognition of expected credit losses for financial assets held and requires enhanced disclosures regarding significant estimates and judgments used in estimating credit losses. ASU 2016-13 is effective for public business entities for annual periods beginning after December 15, 2019. The guidance allows for various methods for measuring expected credit losses. The Company has elected to apply a historical loss rate based on historical write-offs by region, adjusted for current economic conditions and forecasts about future economic conditions that are reasonable and supportable. The Company adopted this standard as of January 1, 2020 and it did not have a material impact on the Company’s condensed consolidated financial statements. Accounting Standards Not Yet Adopted In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848) – Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The guidance in ASU 2020-04 provides temporary optional expedient and exceptions to the guidance in U.S. GAAP on contract modifications and hedge accounting to ease the financial reporting burdens related to expected market transition from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates, such as the Secured Overnight Financing Rate (“SOFR”) (also known as the “reference rate reform”). The guidance allows companies to elect not to apply certain modification accounting requirements to contracts affected by the reference rate reform, if certain criteria are met. The guidance will also allow companies to elect various optional expedients which would allow them to continue to apply hedge accounting for hedging relationships affected by the reference rate reform, if certain criteria are met. The Company is currently evaluating the impact of this ASU on the Company’s consolidated financial statements. As of June 30, 2021, the Company has not yet had contracts modified due to rate reform. ​

Revenue

Revenue	6 Months Ended
	Jun. 30, 2021
Revenue [Abstract]
Revenue	(3) Revenue Revenue is recognized when obligations under the terms of a contract with our customer are satisfied; generally this occurs with the transfer of control of our products and services, which is usually when the parts are shipped or delivered to the customer’s premises. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. The transaction price will include estimates of variable consideration to the extent it is probable that a significant reversal of revenue recognized will not occur. Incidental items that are not significant in the context of the contract are recognized as expense. The expected costs associated with our base warranties continue to be recognized as expense when the products are sold. Customer returns only occur if products do not meet the specifications of the contract and are not connected to any repurchase obligations of the Company. The Company does not have any financing components or significant payment terms as payment occurs shortly after the point of sale. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction that are collected by the Company from a customer are excluded from revenue. Amounts billed to customers related to shipping and handling costs are included in net sales in the condensed consolidated statements of operations. Shipping and handling costs associated with outbound freight after control over a product is transferred to the customer are accounted for as a fulfillment cost and are included in cost of sales. Revenue by Reportable Segment Control Devices. Electronics. Stoneridge Brazil. ​ The following tables disaggregate our revenue by reportable segment and geographical location (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ ​ Electronics ​ ​ Stoneridge Brazil ​ ​ Consolidated ​ Three months ended June 30 2021 2020 ​ 2021 2020 ​ 2021 2020 ​ 2021 2020 Net Sales: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ North America ​ $ 69,357 ​ $ 31,373 ​ ​ $ 27,343 ​ $ 11,749 ​ ​ $ - ​ $ - ​ ​ $ 96,700 ​ $ 43,122 ​ South America ​ - ​ - ​ ​ - ​ - ​ ​ 14,904 ​ 7,010 ​ ​ 14,904 ​ 7,010 ​ Europe ​ 2,843 ​ 4,434 ​ ​ 61,327 ​ 32,585 ​ ​ - ​ - ​ ​ 64,170 ​ 37,019 ​ Asia Pacific ​ 14,145 ​ 11,198 ​ ​ 1,415 ​ 1,196 ​ ​ - ​ - ​ ​ 15,560 ​ 12,394 ​ Total net sales ​ $ 86,345 ​ $ 47,005 ​ ​ $ 90,085 ​ $ 45,530 ​ ​ $ 14,904 ​ $ 7,010 ​ ​ $ 191,334 ​ $ 99,545 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following tables disaggregate our revenue by reportable segment and geographical location (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ ​ Electronics ​ ​ Stoneridge Brazil ​ ​ Consolidated Six months ended June 30 2021 2020 ​ 2021 2020 ​ 2021 2020 ​ 2021 2020 Net Sales: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ North America ​ $ 145,486 ​ $ 111,783 ​ ​ $ 47,748 ​ $ 31,190 ​ ​ $ - ​ $ - ​ ​ $ 193,234 ​ $ 142,973 South America ​ - ​ - ​ ​ - ​ - ​ ​ 26,311 ​ 21,580 ​ ​ 26,311 ​ 21,580 Europe ​ 9,633 ​ 11,822 ​ ​ 122,332 ​ 83,891 ​ ​ - ​ - ​ ​ 131,965 ​ 95,713 Asia Pacific ​ 30,844 ​ 20,250 ​ ​ 2,775 ​ 1,995 ​ ​ - ​ - ​ ​ 33,619 ​ 22,245 Total net sales ​ $ 185,963 ​ $ 143,855 ​ ​ $ 172,855 ​ $ 117,076 ​ ​ $ 26,311 ​ $ 21,580 ​ ​ $ 385,129 ​ $ 282,511 (1) Company sales based on geographic location are where the sale originates not where the customer is located . Performance Obligations For OEM and Tier 1 supplier customers, the Company typically enters into contracts to provide serial production parts that consist of a set of documents including, but not limited to, an award letter, master purchase agreement and master terms and conditions. For each production product, the Company enters into separate purchase orders that contain the product specifications and an agreed-upon price. The performance obligation does not exist until a customer release is received for a specific number of parts. The majority of the parts sold to OEM and Tier 1 supplier customers are customized to the specific customer, with the exception of camera-based vision systems that are common across all customers (CMS for OEMS are customized but sales are not yet material). The transaction price is equal to the contracted price per part and there is no expectation of material variable consideration in the transaction price. For most customer contracts, the Company does not have an enforceable right to payment at any time prior to when the parts are shipped or delivered to the customer; therefore, the Company recognizes revenue at the point in time it satisfies a performance obligation by transferring control of a part to the customer. Our aftermarket products are focused on meeting the demand for repair and replacement parts, compliance parts and accessories and are sold primarily to aftermarket distributors and mass retailers in our South American, European and North American markets. Aftermarket products have one type of performance obligation which is the delivery of aftermarket parts and spare parts. For aftermarket customers, the Company typically has standard terms and conditions for all customers. In addition, aftermarket products have alternative use as they can be sold to multiple customers. Revenue for aftermarket part production contracts is recognized at a point in time when the control of the parts transfer to the customer which is based on the shipping terms. Aftermarket contracts may include variable consideration related to discounts and rebates which is included in the transaction price upon recognizing the product revenue. A small portion of the Company’s sales are comprised of monitoring services that include both monitoring devices and fees to individual, corporate, fleet and cargo customers in our Stoneridge Brazil segment. These monitoring service contracts are generally not capable of being distinct and are accounted for as a single performance obligation. We recognize revenue for our monitoring products and services contracts over the life of the contract. There is no variable consideration associated with these contracts. The Company has the right to consideration from a customer in the amount that corresponds directly with the value to the customer of the Company’s performance to date. Therefore, the Company recognizes revenue over time using the practical expedient ASC 606-10-55-18 in the amount the Company has a “right to invoice” rather than selecting an output or input method. Contract Balances The Company had no material contract assets, contract liabilities or capitalized contract acquisition costs as of June 30, 2021 and December 31, 2020.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2021
Inventories [Abstract]
Inventories	(4) Inventories Inventories are valued at the lower of cost (using either the first-in, first-out (“FIFO”) or average cost methods) or net realizable value. The Company evaluates and adjusts as necessary its excess and obsolescence reserve on a quarterly basis. Excess inventories are quantities of items that exceed anticipated sales or usage for a reasonable period. The Company has guidelines for calculating provisions for excess inventories based on the number of months of inventories on-hand compared to anticipated sales or usage. Management uses its judgment to forecast sales or usage and to determine what constitutes a reasonable period. Inventory cost includes material, labor and overhead. Inventories consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ 2021 2020 Raw materials ​ $ 89,083 ​ $ 67,775 Work-in-progress ​ ​ 8,729 ​ ​ 7,005 Finished goods ​ ​ 16,998 ​ ​ 15,768 Total inventories, net ​ $ 114,810 ​ $ 90,548 ​ Inventory valued using the FIFO method was $102,433 and $82,308 at June 30, 2021 and December 31, 2020, respectively. Inventory valued using the average cost method was $12,377 and $8,240 at June 30, 2021 and December 31, 2020, respectively.

Financial Instruments and Fair

Financial Instruments and Fair Value Measurements	6 Months Ended
	Jun. 30, 2021
Financial Instruments and Fair Value Measurements [Abstract]
Financial Instruments and Fair Value Measurements	(5) Financial Instruments and Fair Value Measurements Financial Instruments A financial instrument is cash or a contract that imposes an obligation to deliver or conveys a right to receive cash or another financial instrument. The carrying values of cash and cash equivalents, accounts receivable and accounts payable are considered to be representative of fair value because of the short maturity of these instruments. The fair value of debt approximates the carrying value of debt. Derivative Instruments and Hedging Activities On June 30, 2021, the Company had open Mexican peso-denominated foreign currency forward contracts. The Company used foreign currency forward contracts solely for hedging and not for speculative purposes during 2021 and 2020. Management believes that its use of these instruments to reduce risk is in the Company’s best interest. The counterparties to these financial instruments are financial institutions with investment grade credit ratings. Foreign Currency Exchange Rate Risk The Company conducts business internationally and, therefore, is exposed to foreign currency exchange rate risk. The Company uses derivative financial instruments as cash flow hedges to manage its exposure to fluctuations in foreign currency exchange rates by reducing the effect of such fluctuations on foreign currency denominated intercompany transactions, inventory purchases and other foreign currency exposures. The Company hedged the euro and Mexican peso currencies during 2020 and the Mexican peso in 2021. These forward contracts were executed to hedge forecasted transactions and have been accounted for as cash flow hedges. As such, gains and losses on derivatives qualifying as cash flow hedges are recorded in accumulated other comprehensive income (loss), to the extent that hedges are effective, until the underlying transactions are recognized in earnings. Unrealized amounts in accumulated other comprehensive income will fluctuate based on changes in the fair value of hedge derivative contracts at each reporting period. The cash flow hedges were highly effective. The effectiveness of the transactions has been and will be measured on an ongoing basis using regression analysis and forecasted future purchases of the currency. In certain instances, the foreign currency forward contracts may not qualify for hedge accounting or are not designated as hedges and, therefore, are marked-to-market with gains and losses recognized in the Company’s condensed consolidated statement of operations as a component of other expense (income), net. At June 30, 2021, all of the Company’s foreign currency forward contracts were designated as cash flow hedges. The Company’s foreign currency forward contracts offset a portion of the gains and losses on the underlying foreign currency denominated transactions as follows: U.S. dollar-denominated Foreign Currency Forward Contracts – Cash Flow Hedges The Company entered into U.S. dollar-denominated currency contracts on behalf of one of its European Electronics subsidiaries, whose functional currency is the euro, with a notional amount at June 30, 2020 of $1,400 which expired ratably on a monthly basis from July 2020 through December 2020. There were no such contracts at June 30, 2021 or December 31, 2020. Mexican peso-denominated Foreign Currency Forward Contracts – Cash Flow Hedges The Company holds Mexican peso-denominated foreign currency forward contracts with a notional amount at June 30, 2021 of $10,880 which expire ratably on a monthly basis from July 2021 to December 2021. The notional amount at December 31, 2020 related to Mexican peso-denominated foreign currency forward contracts was $1,242. The Company evaluated the effectiveness of the Mexican peso and U.S. dollar-denominated forward contracts held as of June 30, 2021 and concluded that the hedges were effective. Interest Rate Risk Interest Rate Risk – Cash Flow Hedge On February 18, 2020, the Company entered into a floating-to-fixed interest rate swap agreement (the “Swap”) with a notional amount of $50,000 to hedge its exposure to interest payment fluctuations on a portion of its Credit Facility. The Swap was designated as a cash flow hedge of the variable interest rate obligation under the Company's Credit Facility that has a current balance of $126,000 at June 30, 2021. Accordingly, the change in fair value of the Swap is recognized in accumulated other comprehensive income (loss). The Swap agreement requires monthly settlements on the same days that the Credit Facility interest payments are due and has a maturity date of March 10, 2023, which is prior to the Credit Facility maturity date of June 4, 2024. Under the Swap terms, the Company pays a fixed interest rate and receives a floating interest rate based on the one-month LIBOR, with a floor. The critical terms of the Swap are aligned with the terms of the Credit Facility, resulting in no hedge ineffectiveness. The difference between amounts to be received and paid under the Swap is recognized as a component of interest expense, net on the condensed consolidated statements of operations. The Swap settlements increased interest expense by $163 and $114 for the three months ended June 30, 2021 and 2020, respectively. The Swap settlements increased interest expense by $321 and $118 for the six months ended June 30, 2021 and 2020, respectively. ​ The notional amounts and fair values of derivative instruments in the condensed consolidated balance sheets were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Prepaid expenses ​ Accrued expenses and ​ ​ Notional amounts (A) ​ and other current assets ​ other current liabilities ​ ​ June 30, ​ December 31, ​ June 30, ​ December 31, ​ June 30, ​ December 31, ​ 2021 2020 2021 2020 2021 2020 Derivatives designated as hedging instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flow hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward currency contracts ​ $ 10,880 ​ $ 1,242 ​ $ 257 ​ $ 255 ​ $ - ​ $ - Interest rate swap ​ $ 50,000 ​ $ 50,000 ​ $ - ​ $ - ​ $ 995 ​ $ 1,318 (A) Notional amounts represent the gross contract of the derivatives outstanding in U.S. dollars. Gross amounts recorded for the cash flow hedges in other comprehensive (loss) income and in net income (loss) for the three months ended June 30 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain (loss) reclassified from ​ ​ Gain (loss) recorded in other ​ other comprehensive income ​ ​ comprehensive income (loss) ​ (loss) into net income (loss) (A) ​ 2021 2020 2021 2020 Derivatives designated as cash flow hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward currency contracts ​ $ 458 ​ $ 716 ​ $ 95 ​ $ (947) Interest rate swap ​ $ (37) ​ $ (245) ​ $ (163) ​ $ (114) (A) Gains (losses) reclassified from other comprehensive loss into net income (loss) recognized in selling, general and administrative expenses (“SG&A”) in the Company’s condensed consolidated statements of operations were $9 and $(235) for the three months ended June 30, 2021 and 2020, respectively. Gains (losses) reclassified from other comprehensive loss into net income (loss) recognized in cost of goods sold (“COGS”) in the Company’s condensed consolidated statements of operations were $86 and $(712) for the three months ended June 30, 2021 and 2020, respectively. Losses reclassified from other comprehensive loss into net income (loss) recognized in interest expense, net in the Company’s condensed consolidated statements of operations were $(163) and $(114) for the three months ended June 30, 2021 and 2020, respectively. ​ ​ Gross amounts recorded for the cash flow hedges in other comprehensive (loss) income and in net income (loss) for the six months ended June 30 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain (loss) reclassified from ​ ​ Gain (loss) recorded in other ​ other comprehensive income ​ ​ comprehensive income (loss) ​ (loss) into net income (loss) (A) ​ 2021 2020 2021 2020 Derivatives designated as cash flow hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward currency contracts ​ $ 304 ​ $ (2,604) ​ $ 302 ​ $ (1,103) Interest rate swap ​ $ 2 ​ $ (1,712) ​ $ (321) ​ $ (118) ​ (A) Gains (losses) reclassified from other comprehensive loss into net income (loss) recognized in SG&A in the Company’s condensed consolidated statements of operations were $89 and $(235) for the six months ended June 30, 2021 and 2020, respectively. Gains (losses) reclassified from other comprehensive loss into net income (loss) recognized in COGS in the Company’s condensed consolidated statements of operations were $213 and $(839) for the six months ended June 30, 2021 and 2020, respectively. Gains (losses) reclassified from other comprehensive loss income into net income (loss) recognized in design and development (“D&D”) in the Company’s condensed consolidated statements of operations were $0 and $(29) for the six months ended June 30, 2021 and 2020, respectively. Losses reclassified from other comprehensive loss into net income (loss) recognized in interest expense, net in the Company’s condensed consolidated statements of operations were $(321) and $(118) for the six months ended June 30, 2021 and 2020, respectively. ​ For the six months ended June 30, 2021, the total net gains on the foreign currency contract cash flow hedges of $257 are expected to be included in COGS, SG&A and D&D within the next 12 months. Of the total net losses on the interest rate swap cash flow hedges, $596 of losses are expected to be included in interest expense, net within the next 12 months and $399 of losses are expected to be included in interest expense, net in subsequent periods. ​ C ash flows from derivatives used to manage foreign exchange and interest rate risks are classified as operating activities within the condensed consolidated statements of cash flows. ​ Fair Value Measurements Certain assets and liabilities held by the Company are measured at fair value on a recurring basis and are categorized using the three levels of the fair value hierarchy based on the reliability of the inputs used. Fair values estimated using Level 1 inputs consist of quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Fair values estimated using Level 2 inputs, other than quoted prices, are observable for the asset or liability, either directly or indirectly and include among other things, quoted prices for similar assets or liabilities in markets that are active or inactive as well as inputs other than quoted prices that are observable. For forward currency contracts, inputs include foreign currency exchange rates. For the interest rate swap, inputs include LIBOR. Fair values estimated using Level 3 inputs consist of significant unobservable inputs. The following table presents our assets and liabilities that are measured at fair value on a recurring basis and are categorized using the three levels of the fair value hierarchy based on the reliability of inputs used. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ ​ December 31, ​ ​ ​ ​ ​ 2021 ​ 2020 ​ ​ ​ ​ ​ Fair values estimated using ​ ​ ​ ​ ​ ​ Fair ​ Level 1 ​ Level 2 ​ Level 3 ​ ​ Fair ​ value inputs inputs inputs value Financial assets carried at fair value: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward currency contract ​ $ 257 ​ $ - ​ $ 257 ​ $ - ​ $ 255 Total financial assets carried at fair value ​ $ 257 ​ $ - ​ $ 257 ​ $ - ​ $ 255 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities carried at fair value: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap ​ ​ 995 ​ ​ - ​ ​ 995 ​ ​ - ​ ​ 1,318 Earn-out consideration ​ ​ 7,264 ​ ​ - ​ ​ - ​ ​ 7,264 ​ ​ 5,813 Total financial liabilities carried at fair value ​ $ 8,259 ​ $ - ​ $ 995 ​ $ 7,264 ​ $ 7,131 ​ The following table sets forth a summary of the change in fair value of the Company’s Level 3 financial liabilities related to earn-out consideration that are measured at fair value on a recurring basis. ​ ​ ​ ​ ​ ​ ​ ​ ​ Stoneridge Brazil ​ 2021 2020 Balance at January 1 ​ $ 5,813 ​ $ 12,011 Change in fair value ​ ​ 1,215 ​ ​ (233) Foreign currency adjustments ​ ​ 236 ​ ​ (3,207) Balance at June 30 ​ $ 7,264 ​ $ 8,571 ​ ​ The Company will be required to pay the Stoneridge Brazil earn-out consideration, which is not capped, based on Stoneridge Brazil’s financial performance in 2021. The fair value of the Stoneridge Brazil earn-out consideration is based on discounted cash flows utilizing forecasted earnings before interest, depreciation and amortization (“EBITDA”) in 2021 using the key inputs of forecasted sales and expected operating income reduced by the market required rate of return. The earn-out consideration obligation related to Stoneridge Brazil is recorded within accrued expenses and other current liabilities in the condensed consolidated balance sheets as of June 30, 2021 and other long-term liabilities in the consolidated balance sheets as of December 31, 2020. The change in fair value of the earn-out consideration for Stoneridge Brazil was due to updated financial performance projections and unfavorable foreign currency translation offset by the reduced time from the current period end to the payment date. The change in fair value of the Stoneridge Brazil earn-out consideration was recorded in SG&A expense and the foreign currency impact was included in other expense (income), net in the condensed consolidated statements of operations. There were no transfers in or out of Level 3 from other levels in the fair value hierarchy for the six months ended June 30, 2021. ​ Impairment of Long-Lived Assets or Finite-Lived Assets ​ The Company reviews the carrying value of its long-lived assets and finite-lived intangible assets for impairment when events or circumstances indicate that their carrying value may not be recoverable. Factors the Company considers important that could trigger testing of the related asset groups for an impairment include current period operating or cash flow losses combined with a history of operating or cash flow losses, a projection or forecast that demonstrates continuing losses, significant adverse changes in the business climate within a particular business or current expectations that a long-lived asset will be sold or otherwise disposed of significantly before the end of its estimated useful life. To test for impairment, the estimated undiscounted cash flows expected to be generated from the use and disposal of the asset or asset group is compared to its carrying value. An asset group is established by identifying the lowest level of cash flows generated by the group of assets that are largely independent of cash flows of other assets. If cash flows cannot be separately and independently identified for a single asset, we will determine whether an impairment has occurred for the group of assets for which we can identify projected cash flows. If these undiscounted cash flows are less than their respective carrying values, an impairment charge would be recognized to the extent that the carrying values exceed estimated fair values. The estimation of undiscounted cash flows and fair value requires us to make assumptions regarding future operating results over the life of the asset or the life of the primary asset in the asset group. The results of the impairment testing are dependent on these estimates which require judgment. The occurrence of certain events, including changes in economic and competitive conditions, could impact cash flows eventually realized and management’s ability to accurately assess whether an asset is impaired. ​ On May 19, 2020, the Company committed to the strategic exit of its Control Devices particulate matter (“PM”) sensor product line. As a result of the strategic exit of the PM sensor product line the Company determined an impairment indicator existed and performed a recoverability test of the related long-lived assets. The Company identified that there are two asset groups comprised of PM fixed assets at the Company’s Lexington, Ohio and Tallinn, Estonia facilities. As a result of the recoverability test performed, the Company determined that the undiscounted cash flows did not exceed the carrying value of the PM fixed assets at the Company’s Tallinn, Estonia facility. As such, an impairment loss of $2,326 was recorded based on the difference between the fair value and the carrying value of the assets. The Company used the income approach to determine the fair value of the PM fixed assets at the Tallinn, Estonia facility. During the three and six months ended June 30, 2020, the impairment loss of $2,326 was recorded on the Company’s condensed consolidated statement of operations within selling, general and administrative expense. The inputs utilized in the analyses are classified as Level 3 inputs within the fair value hierarchy as defined in ASC 820, "Fair Value Measurement."

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2021
Share-Based Compensation [Abstract]
Share-Based Compensation	(6) Share-Based Compensation Compensation expense for share-based compensation arrangements, which is recognized in the condensed consolidated statements of operations as a component of SG&A expenses, was $1,599 and $733 for the three months ended June 30, 2021 and 2020, respectively. Compensation expense for share-based compensation arrangements, which is recognized in the condensed consolidated statements of operations as a component of SG&A expenses, was $2,761 and $2,110 for the six months ended June 30, 2021 and 2020, respectively. The expenses related to share-based compensation awards for the three and six months ended June 30, 2021 were higher than the three and six months ended June 30, 2020 due to the recognition of reduced attainment of performance-based awards during the second quarter of 2020.

Debt

Debt	6 Months Ended
	Jun. 30, 2021
Debt [Abstract]
Debt	(7) Debt Debt consisted of the following at June 30, 2021 and December 31, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ Interest rates at ​ ​ ​ 2021 2020 June 30, 2021 Maturity Revolving Credit Facility ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Credit Facility ​ $ 126,000 ​ $ 136,000 ​ 2.85% ​ June 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Debt ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Stoneridge Brazil short-term obligations ​ ​ 269 ​ ​ 1,561 ​ 8.80% ​ November 2021 Sweden short-term credit line ​ ​ 4 ​ ​ 1,591 ​ 2.60% ​ July 2021 Suzhou short-term credit line ​ ​ 4,182 ​ ​ 4,521 ​ 3.85% - 5.00% ​ August 2021 - May 2022 Total debt ​ ​ 4,455 ​ ​ 7,673 ​ ​ ​ ​ Less: current portion ​ ​ (4,455) ​ ​ (7,673) ​ ​ ​ ​ Total long-term debt, net ​ $ - ​ $ - ​ ​ ​ ​ ​ Revolving Credit Facility On June 5, 2019, the Company entered into the Fourth Amended and Restated Credit Agreement (the “Credit Facility”). The Credit Facility provides for a $400,000 senior secured revolving credit facility and it replaced and superseded the Third Amended and Restated Credit Agreement that provided for a $300,000 revolving credit facility. The Credit Facility has an accordion feature which allows the Company to increase the availability by up to $150,000 upon the satisfaction of certain conditions and includes a letter of credit subfacility, swing line subfacility and multicurrency subfacility. The Credit Facility has a termination date of June 5, 2024. Borrowings under the Credit Facility bear interest at either the Base Rate or the LIBOR rate, at the Company’s option, plus the applicable margin as set forth in the Credit Facility. The Credit Facility contains certain financial covenants that require the Company to maintain less than a maximum leverage ratio and more than a minimum interest coverage ratio. ​ The Credit Facility contains customary affirmative covenants and representations. The Credit Facility also contains customary negative covenants, which, among other things, are subject to certain exceptions, including restrictions on (i) indebtedness, (ii) liens, (iii) liquidations, mergers, consolidations and acquisitions, (iv) disposition of assets or subsidiaries, (v) affiliate transactions, (vi) creation or ownership of certain subsidiaries, partnerships and joint ventures, (vii) continuation of or change in business, (viii) restricted payments, (ix) prepayment of subordinated and junior lien indebtedness, (x) restrictions in agreements on dividends, intercompany loans and granting liens on the collateral, (xi) loans and investments, (xii) sale and leaseback transactions, (xiii) changes in organizational documents and fiscal year and (xiv) transactions with respect to bonding subsidiaries. The Credit Facility contains customary events of default, subject to customary thresholds and exceptions, including, among other things, (i) non-payment of principal and non-payment of interest and fees, (ii) a material inaccuracy of a representation or warranty at the time made, (iii) a failure to comply with any covenant, subject to customary grace periods in the case of certain affirmative covenants, (iv) cross default of other debt, final judgments and other adverse orders in excess of $30,000, (v) any loan document shall cease to be a legal, valid and binding agreement, (vi) certain uninsured losses or proceedings against assets with a value in excess of $30,000, (vii) ERISA events, (viii) a change of control, or (ix) bankruptcy or insolvency proceedings. ​ Due to the expected impact of the COVID-19 pandemic on the Company’s end-markets and the resulting expected financial impacts to the Company, on June 26, 2020, the Company entered into a Waiver and Amendment No. 1 to the Fourth Amended and Restated Credit Agreement (“Amendment No. 1”). Amendment No. 1 provides for certain covenant relief and restrictions during the “Covenant Relief Period” (the period ending on the date that the Company delivers a compliance certificate for the quarter ending June 30, 2021 in form and substance satisfactory to the administrative agent). During the Covenant Relief Period: ​ ● the maximum net leverage ratio is suspended; ● the calculation of the minimum interest coverage ratio will exclude second quarter 2020 financial results effective for the quarters ended September 30, 2020 through March 31, 2021; ● the minimum interest coverage ratio of 3.50 is reduced to 2.75 and 3.25 for the quarters ended December 31, 2020 and March 31, 2021, respectively; ● the Company’s liquidity may not be less than $150,000 ; ● the Company’s aggregate amount of cash and cash equivalents cannot exceed $130,000 ; ● there are certain restrictions on Restricted Payments (as defined); and ● a Permitted Acquisition (as defined) may be not consummated unless otherwise approved in writing by the required lenders. ​ Amendment No. 1 changes the leverage based LIBOR pricing grid through the maturity date and also provides for a LIBOR floor of 50 basis points on outstanding borrowings excluding any Specified Hedge Borrowings (as defined) which remain subject to a LIBOR floor of 0 basis points. As of June 30, 2021, Specified Hedge Borrowings were $50,000 . ​ The Company capitalized an additional $1,086 of deferred financing costs as a result of entering into Amendment No. 1. ​ Borrowings outstanding on the Credit Facility were $126,000 and $136,000 at June 30, 2021 and December 31, 2020, respectively. ​ The Company was in compliance with all credit facility covenants at June 30, 2021 and December 31, 2020. ​ The Company also has outstanding letters of credit of $1,703 and $1,720 at June 30, 2021 and December 31, 2020, respectively. ​ Debt Stoneridge Brazil maintains short-term notes used for working capital purposes which have fixed or variable interest rates. The weighted-average interest rates of short-term debt of Stoneridge Brazil at June 30, 2021 was 8.8%. Depending on the specific note, interest is payable either monthly or annually. Principal repayments of $269 on Stoneridge Brazil debt at June 30, 2021 are due in 2021. The Company’s wholly-owned subsidiary located in Sweden, has an overdraft credit line which allows overdrafts on the subsidiary’s bank account up to a daily maximum level of 20,000 Swedish krona, or $2,339 and $2,435, at June 30, 2021 and December 31, 2020, respectively. At June 30, 2021 there was 36 Swedish krona, or $4, outstanding on this The Company’s wholly-owned subsidiary located in Suzhou, China (the “Suzhou subsidiary”), has two credit lines (the “Suzhou credit line”) which allow up to a maximum borrowing level of 50,000 Chinese yuan, or $7,744 and $7,663 at June 30, 2021, and December 31, 2020. At June 30, 2021 and December 31, 2020 there was $4,182 and $4,521, respectively, in borrowings outstanding on the Suzhou credit line with weighted-average interest rates of 4.24% and 4.32%, respectively. The Suzhou credit line is included on the condensed consolidated balance sheet within current portion of debt. In addition, the Suzhou subsidiary has a bank acceptance draft line of credit which facilitates the extension of trade payable payment terms by 180 days. This bank acceptance draft line of credit allows up to a maximum borrowing level of 15,000 Chinese yuan, or $2,323 and $2,299, at June 30, 2021 and December 31, 2020, respectively. There was $594 and $414 utilized on the Suzhou bank acceptance draft line of credit at June 30, 2021 and December 31, 2020, respectively.

Leases

Leases	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leases	(8) Leases The Company, as lessor, entered into a lease with a third-party lessee effective July 1, 2020, for our Canton, Massachusetts facility. In conjunction with the Canton restructuring plan outlined in Note 12, the Company ceased operations at this facility in March 2020. As discussed in Note 16, the Company sold the Canton facility and assigned the lease to the buyer on June 17, 2021. The Company recognized lease income on a straight-line basis over the lease term until the time of the sale. The Company recognized, in its Control Devices segment, operating and variable lease income from the lease in our condensed consolidated statements of operations of $282 and $100, respectively, for the three months ended June 30, 2021. The Company recognized operating and variable lease income from the lease in our condensed consolidated statements of operations of $602 and $199, respectively, for the six months ended June 30, 2021. ​

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share	(9) Earnings Per Share Basic earnings per share was computed by dividing net income by the weighted-average number of Common Shares outstanding for each respective period. Diluted earnings per share was calculated by dividing net income by the weighted-average of all potentially dilutive Common Shares that were outstanding during the periods presented. However, for all periods in which the Company recognized a net loss, the Company did not recognize the effect of the potential dilutive securities as their inclusion would be anti-dilutive. Potential dilutive shares of 204,461 and 276,360 for the three and six months ended June 30, 2020, respectively, were excluded from diluted loss per share because the effect would be anti-dilutive. Weighted-average Common Shares outstanding used in calculating basic and diluted earnings per share were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ Six months ended ​ ​ ​ ​ June 30, ​ June 30, ​ ​ ​ 2021 2020 2021 2020 ​ ​ Basic weighted-average Common Shares outstanding ​ 27,137,207 ​ 26,952,336 ​ 27,077,152 ​ 27,092,186 ​ ​ Effect of dilutive shares ​ 295,210 ​ - ​ 364,844 ​ - ​ ​ Diluted weighted-average Common Shares outstanding ​ 27,432,417 ​ 26,952,336 ​ 27,441,996 ​ 27,092,186 ​ ​ ​ There were 747,545 and 771,854 performance-based right to receive Common Shares outstanding at June 30, 2021 and 2020, respectively. The right to receive Common Shares are included in the computation of diluted earnings per share based on the number of Common Shares that would be issuable if the end of the quarter were the end of the contingency period.

Equity and Accumulated Other Co

Equity and Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2021
Equity and Accumulated Other Comprehensive Loss [Abstract]
Equity and Accumulated Other Comprehensive Loss	(10) Equity and Accumulated Other Comprehensive Loss Common Share Repurchase ​ On October 26, 2018, the Company’s Board of Directors authorized the Company to repurchase up to $50,000 of Common Shares. Thereafter, on May 7, 2019, the Company entered into a Master Confirmation (the “Master Confirmation”) and a Supplemental Confirmation, together with the Master Confirmation, the Accelerated Share Repurchase Agreement (“ASR Agreement”), with Citibank N.A. (the “Bank”) to purchase Company Common Shares for a payment of $50,000 (the “Prepayment Amount”). Under the terms of the ASR Agreement, on May 7, 2019, the Company paid the Prepayment Amount to the Bank and received on May 8, 2019 an initial delivery of 1,349,528 Company Common Shares, which approximated 80% of the total number of Company Common Shares expected to be repurchased under the ASR Agreement based on the closing price of the Company’s Common Shares on May 7, 2019. These Common Shares became treasury shares and were recorded as a ​ On February 25, 2020, the Bank notified the Company that it terminated early its commitment pursuant the ASR Agreement and would deliver 364,604 Common Shares on February 27, 2020 based on the volume weighted average price of our Common Shares during the term set forth in the ASR Agreement. The Bank’s notice of early termination and the subsequent delivery of Common Shares represents the final settlement of the Company’s share repurchase program pursuant to the accelerated share repurchase agreement. These Common Shares became treasury shares and were recorded as a $10,000 reduction to shareholders’ equity as Common Shares held in treasury with the offset of $10,000 to additional paid-in capital. ​ On February 24, 2020, the Company’s Board of Directors authorized a new repurchase program of $50,000 for the repurchase of the Company’s outstanding Common Shares over the next 18 months . The repurchases may be made from time to time in either open market transactions or in privately negotiated transactions. Repurchases may also be made under Rule 10b-18 plans, which permit Common Shares to be repurchased through pre-determined criteria. ​ On March 3, 2020, under the new repurchase program the Company entered into a 10b-18 Agreement Letter (the “10b-18 Agreement”), with the Bank to purchase Company Common Shares, under purchasing conditions of Rule 10b-18 promulgated under the Securities Exchange Act of 1934, as amended (“Rule 10b-18”), for up to $5,000. Under the terms of the 10b-18 Agreement, commencing March 3, 2020 and ending March 6, 2020, the Company received delivery of a total of 242,634 Company Common Shares for the amount of $4,995 . These Common Shares became treasury shares and were recorded as a ​ Accumulated Other Comprehensive Loss Changes in accumulated other comprehensive loss for the three months ended June 30, 2021 and 2020 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ Unrealized ​ ​ ​ ​ ​ ​ currency ​ ​ gain (loss) ​ ​ ​ ​ ​ translation ​ on derivatives ​ Total Balance at April 1, 2021 ​ $ (99,573) ​ $ (969) ​ $ (100,542) Other comprehensive income before reclassifications ​ ​ 7,172 ​ ​ 332 ​ ​ 7,504 Amounts reclassified from accumulated other comprehensive loss ​ ​ - ​ ​ 54 ​ ​ 54 Net other comprehensive income, net of tax ​ ​ 7,172 ​ ​ 386 ​ ​ 7,558 Balance at June 30, 2021 ​ $ (92,401) ​ $ (583) ​ $ (92,984) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at April 1, 2020 ​ $ (108,591) ​ $ (3,655) ​ $ (112,246) Other comprehensive income before reclassifications ​ ​ 1,821 ​ ​ 372 ​ ​ 2,193 Amounts reclassified from accumulated other comprehensive loss ​ ​ - ​ ​ 838 ​ ​ 838 Net other comprehensive income, net of tax ​ ​ 1,821 ​ ​ 1,210 ​ ​ 3,031 Balance at June 30, 2020 ​ $ (106,770) ​ $ (2,445) ​ $ (109,215) ​ ​ ​ ​ ​ ​ Changes in accumulated other comprehensive loss for the six months ended June 30, 2021 and 2020 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ Unrealized ​ ​ ​ ​ ​ currency ​ gain (loss) ​ ​ ​ ​ translation on derivatives Total Balance at January 1, 2021 ​ $ (88,795) ​ $ (840) ​ $ (89,635) Other comprehensive (loss) income before reclassifications ​ ​ (3,606) ​ ​ 242 ​ ​ (3,364) Amounts reclassified from accumulated other comprehensive loss ​ ​ - ​ ​ 15 ​ ​ 15 Net other comprehensive (loss) income, net of tax ​ ​ (3,606) ​ ​ 257 ​ ​ (3,349) Balance at June 30, 2021 ​ $ (92,401) ​ $ (583) ​ $ (92,984) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at January 1, 2020 ​ $ (91,472) ​ $ - ​ $ (91,472) Other comprehensive loss before reclassifications ​ ​ (15,298) ​ ​ (3,410) ​ ​ (18,708) Amounts reclassified from accumulated other comprehensive loss ​ ​ - ​ ​ 965 ​ ​ 965 Net other comprehensive loss, net of tax ​ ​ (15,298) ​ ​ (2,445) ​ ​ (17,743) Balance at June 30, 2020 ​ $ (106,770) ​ $ (2,445) ​ $ (109,215) ​ ​

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies [Abstract]
Commitments and Contingencies	(11) Commitments and Contingencies From time to time we are subject to various legal actions and claims incidental to our business, including those arising out of breach of contracts, product warranties, product liability, patent infringement, regulatory matters and employment-related matters. The Company establishes accruals for matters which it believes that losses are probable and can be reasonably estimated. Although it is not possible to predict with certainty the outcome of these matters, the Company is of the opinion that the ultimate resolution of these matters will not have a material adverse effect on its consolidated results of operations or financial position. As a result of environmental studies performed at the Company’s former facility located in Sarasota, Florida, the Company became aware of soil and groundwater contamination at the site and engaged an environmental engineering consultant to develop a remediation and monitoring plan for the site. Soil remediation at the site was completed during the year ended December 31, 2010. A remedial action plan was approved by the Florida Department of Environmental Protection and groundwater remediation began in the fourth quarter of 2015. During the three months ended June 30, 2021 and 2020, the Company recognized expense of $0 and $103, respectively, related to groundwater remediation. During the six months ended June 30, 2021 and 2020, the Company recognized expense of $407 and $105, respectively, related to groundwater remediation. At June 30, 2021 and December 31, 2020, the Company accrued $529 and $180 , respectively, related to expected future remediation costs. At June 30, 2021 and December 31, 2020, The Company’s Stoneridge Brazil subsidiary has civil, labor and other tax contingencies (excluding income tax) for which the likelihood of loss is deemed to be reasonably possible, but not probable, by the Company’s legal advisors in Brazil. As a result, no provision has been recorded with respect to these contingencies, which amounted to R$46,583 ($9,313) and R$43,736 ($8,416) at June 30, 2021 and December 31, 2020, respectively. An unfavorable outcome on these contingencies could result in significant cost to the Company and adversely affect its results of operations. On August 12, 2020, the Brazilian Administrative Counsel for Economic Defense (“CADE”) issued a ruling against Stoneridge Brazil for abuse of dominance and market foreclosure through its prior use of exclusivity provisions in agreements with its distributors. The CADE tribunal imposed a R $7,995 ( $1,598 ) fine which is included in the reasonably possible contingencies noted above. The Company is challenging this ruling in Brazilian federal court to reverse this decision by the CADE tribunal. ​ Product Warranty and Recall Amounts accrued for product warranty and recall claims are established based on the Company’s best estimate of the amounts necessary to settle existing and future claims on products sold as of the balance sheet dates. These accruals are based on several factors including past experience, production changes, industry developments and various other considerations. Our estimate is based on historical trends of units sold and claim payment amounts, combined with our current understanding of the status of existing claims and discussions with our customers. The key factors in our estimate are the stated or implied warranty period, the customer source, customer policy decisions regarding warranties and customers seeking to hold the Company responsible for their product warranties. The Company can provide no assurances that it will not experience material claims or that it will not incur significant costs to defend or settle such claims beyond the amounts accrued. The current portion of product warranty and recall is included as a component of accrued expenses and other current liabilities in the condensed consolidated balance sheets. Product warranty and recall included ​ ​ ​ ​ ​ The following provides a reconciliation of changes in product warranty and recall liability: ​ ​ ​ ​ ​ ​ ​ Six months ended June 30 2021 2020 Product warranty and recall at beginning of period ​ $ 12,691 ​ $ 10,796 Accruals for warranties established during period ​ ​ 3,092 ​ ​ 3,201 Aggregate changes in pre-existing liabilities due to claim developments ​ ​ 223 ​ ​ 614 Settlements made during the period ​ ​ (5,889) ​ ​ (3,375) Foreign currency translation ​ ​ (169) ​ ​ (173) Product warranty and recall at end of period ​ $ 9,948 ​ $ 11,063 ​ ​ ​ ​ ​ Brazilian Indirect Tax ​ In 2019, the Company received judicial notification that the Superior Judicial Court of Brazil rendered a favorable decision on Stoneridge Brazil’s case granting the Company the right to recover, through offset of federal tax liabilities, amounts collected by the government from June 2010 to February 2017. As a result, the Company recorded a pre-tax benefit of $6,473 in the year ended December 31, 2019. ​ The Brazilian tax authorities have sought clarification before the Supreme Court of Brazil (in a leading case involving another taxpayer) of certain matters that could affect the rights of Brazilian taxpayers regarding these credits. The leading case was decided on May 13, 2021. The Company does not expect any impact to amounts previously recognized as a result of the Supreme Court decision.

Business Realignment and Restru

Business Realignment and Restructuring	6 Months Ended
	Jun. 30, 2021
Business Realignment and Restructuring
Business Realignment and Restructuring	(12) Business Realignment and Restructuring On May 19, 2020, the Company committed to the strategic exit of its Control Devices particulate matter (“PM”) sensor product line. The decision to exit the PM sensor product line was made after consideration of the decline in the market outlook for diesel passenger vehicles, the current and expected profitability of the product line and the Company’s strategic focus on aligning resources with the greatest opportunities. In conjunction with the strategic exit of the PM sensor product line, the Company entered into an asset purchase agreement related to the sale of the PM sensor product line during the first quarter of 2021. Refer to Note 16 of the condensed consolidated financial statements for additional details regarding the sale. As a result of the PM sensor restructuring actions, the Company recognized expense of $285 and $2,552 for the three months ended June 30, 2021 and 2020, respectively, for non-cash fixed asset charges, including impairment and accelerated depreciation of PM sensor related fixed assets and other related costs. For the three months ended June 30, 2021 restructuring related costs of $250 and $35 were recognized in COGS and SG&A, respectively. For the three months ended June 30, 2020 restructuring related costs of $164 and $2,388 were recognized in COGS and SG&A, respectively. The Company recognized expense of $1,654 and $2,552 for the six months ended June 30, 2021 and 2020, respectively, for non-cash fixed asset charges, including impairment and accelerated depreciation of PM sensor related fixed assets and other related costs. For the six months ended June 30, 2021 restructuring related costs of $900 , $673 and $81 were recognized in COGS, SG&A and D&D, respectively. For the six months ended June 30, 2020 restructuring related costs of $164 and $2,388 were recognized in COGS and SG&A, respectively. The estimated range of additional cost of the plan to exit the PM sensor product line, that will impact the Control Devices segment, is approximately $1,700 to $4,900 and is related to employee severance and termination costs, contract terminations costs and other related costs such as potential commercial and supplier settlements. We anticipate that these costs will be incurred through the fourth quarter of 2021. ​ ​ ​ The expenses for the exit of the PM sensor line that relate to the Control Devices reportable segment include the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2021 Charge ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2021 ​ to Expense ​ Cash ​ Non-Cash ​ June 30, 2021 Fixed asset impairment and ​ $ - ​ $ 185 ​ $ - ​ $ (185) ​ $ - Employee termination benefits ​ ​ - ​ ​ 76 ​ ​ (76) ​ ​ - ​ ​ - Other related costs ​ ​ - ​ ​ 1,393 ​ ​ (1,393) ​ ​ - ​ ​ - Total ​ $ - ​ $ 1,654 ​ $ (1,469) ​ $ (185) ​ $ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2020 Charge ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2020 ​ to Expense ​ Cash ​ Non-Cash ​ June 30, 2020 Fixed asset impairment and ​ $ - ​ $ 2,482 ​ $ - ​ $ (2,482) ​ $ - Other related costs ​ ​ - ​ ​ 70 ​ ​ (70) ​ ​ - ​ ​ - Total ​ $ - ​ $ 2,552 ​ $ (70) ​ $ (2,482) ​ $ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ On January 10, 2019, the Company committed to a restructuring plan that resulted in the closure of the Canton, Massachusetts facility (“Canton Facility”) on March 31, 2020 and the consolidation of manufacturing operations at that site into other Company locations (“Canton Restructuring”). Company management informed employees at the Canton Facility of this restructuring decision on January 11, 2019. The costs for the Canton Restructuring included employee severance and termination costs, contract terminations costs, professional fees and other related costs such as moving and set-up costs for equipment and costs to restore the engineering function previously located at the Canton facility. As a result of the Canton Restructuring actions, the Company recognized expense of $0 and $461 respectively, for the three months ended June 30, 2021 and 2020 for employee termination benefits and other restructuring related costs. For the three months ended June 30, 2020 severance and other related restructuring costs of $80, $235 and $146 were recognized in COGS, SG&A and D&D, respectively, in the condensed consolidated statement of operations. The Company recognized expense of $13 and $2,683 respectively, for the six months ended June 30, 2021 and 2020 for employee termination benefits and other restructuring related costs. For the six months ended June 30, 2021 other restructuring related costs of $13 were recognized in D&D in the condensed consolidated statement of operations. For the six months ended June 30, 2020 severance and other related restructuring costs of $1,570, $549 and $564 were recognized in COGS, SG&A and D&D, respectively, in the condensed consolidated statement of operations. We do not expect to incur additional costs related to the Canton Restructuring. Refer to Note 8 and Note 16 to the condensed consolidated financial statements for additional details regarding the third-party lease and sale, respectively, of the Canton facility. The expenses for the Canton Restructuring that relate to the Control Devices reportable segment include the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2021 Charge ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2021 ​ to Expense ​ Cash ​ Non-Cash ​ June 30, 2021 Employee termination benefits ​ $ 165 ​ $ - ​ $ (25) ​ $ - ​ $ 140 Other related costs ​ ​ - ​ ​ 13 ​ ​ (13) ​ ​ - ​ ​ - Total ​ $ 165 ​ $ 13 ​ $ (38) ​ $ - ​ $ 140 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2020 Charge ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2020 ​ to Expense ​ Cash ​ Non-Cash ​ June 30, 2020 Employee termination benefits ​ $ 2,636 ​ $ 1,119 ​ $ (3,755) ​ $ - ​ $ - Other related costs ​ ​ - ​ ​ 1,564 ​ ​ (1,564) ​ ​ - ​ ​ - Total ​ $ 2,636 ​ $ 2,683 ​ $ (5,319) ​ $ - ​ $ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In the fourth quarter of 2018, the Company undertook restructuring actions for the Electronics segment affecting the European Aftermarket business and China operations. In the second quarter of 2020, the Company finalized plans to move its European Aftermarket sales activities in Dundee, Scotland which resulted in incurring contract termination costs as well as employee severance and termination costs. In addition, the Company announced an additional restructuring program to transfer the European production of its controls product line to China. As a result of these actions, the Company recognized expense of $21 and $1,621, respectively, for the three months ended June 30, 2021 and 2020 for employee severance and termination costs, contract termination costs, other related costs and non-cash fixed asset charges for accelerated depreciation of fixed assets and other related costs. Electronics segment restructuring costs (benefit) recognized in COGS, SG&A, and D&D in the condensed consolidated statement of operations for the three months ended June 30, 2021 were $5, $19 and $(3), respectively. Electronics segment restructuring costs recognized in SG&A and D&D in the condensed consolidated statement of operations were $1,244 and $377 for the three months ended June 30, 2020, respectively. The Company recognized expense of $220 and $1,628, respectively, for the six months ended June 30, 2021 and 2020 for employee severance and termination costs, contract termination costs, other related costs and non-cash fixed asset charges for accelerated depreciation of fixed assets and other related costs. Electronics segment restructuring costs recognized in COGS, SG&A, and D&D in the condensed consolidated statement of operations for the three months ended June 30, 2021 were $3, $174 and $43, respectively. Electronics segment restructuring costs recognized in SG&A and D&D in the condensed consolidated statement of operations were $1,251 and $377 for the six months ended June 30, 2020, respectively. The Company expects to incur up to $19 of additional restructuring costs related to these actions through the fourth quarter of 2021. The expenses for the restructuring activities that relate to the Electronics reportable segment include the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2021 Charge to ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2021 ​ Expense ​ Cash ​ Non-Cash ​ June 30, 2021 Employee termination benefits ​ $ 227 ​ $ 50 ​ $ (212) ​ $ - ​ $ 65 Other related costs ​ ​ - ​ ​ 170 ​ ​ (170) ​ ​ - ​ ​ - Total ​ $ 227 ​ $ 220 ​ $ (382) ​ $ - ​ $ 65 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2020 Charge to ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2020 ​ Expense ​ Cash ​ Non-Cash ​ June 30, 2020 Employee termination benefits ​ $ 52 ​ $ 863 ​ $ (319) ​ $ - ​ $ 596 Contract termination costs ​ ​ - ​ ​ 452 ​ ​ (452) ​ ​ - ​ ​ - Other related costs ​ ​ - ​ ​ 313 ​ ​ (313) ​ ​ - ​ ​ - Total ​ $ 52 ​ $ 1,628 ​ $ (1,084) ​ $ - ​ $ 596 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In addition to the specific restructuring activities, the Company regularly evaluates the performance of its businesses and cost structures, including personnel, and makes necessary changes thereto in order to optimize its results. The Company also evaluates the required skill sets of its personnel and periodically makes strategic changes. As a consequence of these actions, the Company incurs severance related costs which are referred to as business realignment charges. Business realignment charges by reportable segment were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ ​ Six months ended ​ ​ ​ June 30, ​ ​ June 30, ​ 2021 2020 2021 2020 Control Devices (A) ​ $ - ​ $ 1,042 ​ $ 192 ​ $ 1,419 Electronics (B) ​ ​ 1 ​ ​ 1,305 ​ ​ 13 ​ ​ 1,305 Stoneridge Brazil (C) ​ ​ 59 ​ ​ - ​ ​ 59 ​ ​ 153 Unallocated Corporate (D) ​ ​ - ​ ​ 236 ​ ​ 42 ​ ​ 310 Total business realignment charges ​ $ 60 ​ $ 2,583 ​ $ 306 ​ $ 3,187 ​ (A) Severance costs for the three months ended June 30, 2020 related to COGS, D&D and SG&A were $603 , $249 and $190 , respectively. Severance costs for the six months ended June 30, 2021 related to SG&A were $192 . Severance costs for the six months ended June 30, 2020 related to COGS, D&D and SG&A were $603 , $249 and $567 , respectively. (B) Severance costs for the three months ended June 30, 2021 related to D&D were $1, respectively. Severance costs for the six months ended June 30, 2021 related to SG&A and D&D were $(22) and $35 , respectively. Severance costs for the three and six months ended June 30, 2020 related to COGS, D&D and SG&A were $323 , $228 and $754 , respectively. (C) Severance costs for the three and six months ended June 30, 2021 related to COGS and SG&A were $7 and $52 , respectively. Severance costs for the six months ended June 30, 2020 related to COGS and SG&A were $86 and $67, respectively. (D) Severance costs for the three months ended 2020 related to SG&A were $236 . Severance costs for the six months ended June 30, 2021 and 2020 related to SG&A were $42 and $310 , respectively. Business realignment charges classified by statement of operations line item were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ ​ Six months ended ​ ​ ​ June 30, ​ ​ June 30, ​ 2021 2020 2021 2020 Cost of goods sold ​ $ 7 ​ $ 926 ​ $ 7 ​ $ 1,012 Selling, general and administrative ​ ​ 52 ​ ​ 1,180 ​ ​ 264 ​ ​ 1,698 Design and development ​ ​ 1 ​ ​ 477 ​ ​ 35 ​ ​ 477 Total business realignment charges ​ $ 60 ​ $ 2,583 ​ $ 306 ​ $ 3,187 ​

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Taxes [Abstract]
Income Taxes	(13) Income Taxes For interim tax reporting we estimate our annual effective tax rate and apply it to our year to date ordinary income. Tax jurisdictions with a projected or year to date loss for which a benefit cannot be realized are excluded. For the three months ended June 30, 2021, income tax expense of $5,794 was attributable to the gain on the sale of the Canton facility, the mix of earnings among tax jurisdictions as well as tax losses for which no benefit is recognized due to valuation allowances in certain jurisdictions. The effective tax rate of 22.6% is greater than the statutory rate primarily due to the impact of tax losses for which no benefit is recognized due to valuation allowances in certain jurisdictions as well at U.S. taxes on foreign earnings, partially offset by tax incentives. For the six months ended June 30, 2021, income tax expense of $6,213 was attributable to the gain on the sale of the Canton facility, mix of earnings among tax jurisdictions as well as tax losses for which no benefit is recognized due to valuation allowances in certain jurisdictions. The effective tax rate of 23.8% is greater than the statutory rate primarily due to the impact of tax losses for which no benefit is recognized due to valuation allowances in certain jurisdictions as well as U.S. taxes on foreign earnings, partially offset by tax incentives. For the three months ended June 30, 2020, income tax benefit of $(6,721) was primarily related to the mix of earnings among tax jurisdictions as well as valuation allowances in certain jurisdictions. The effective tax rate of 23.6% is greater than the statutory rate primarily due to the impact of certain incentives. For the six months ended June 30, 2020, income tax benefit of $(5,508) was primarily related to the mix of earnings among tax jurisdictions partially offset by the establishment of a valuation allowance. The effective tax rate of 23.2% is greater than the statutory rate primarily due to the impact of certain incentives. ​

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Segment Reporting	(14) Segment Reporting Operating segments are defined as components of an enterprise that are evaluated regularly by the Company’s chief operating decision maker in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is the Chief Executive Officer. The Company has three reportable segments, Control Devices, Electronics and Stoneridge Brazil, which also represent its operating segments. The Control Devices reportable segment produces actuators, sensors, switches and connectors. The Electronics reportable segment produces driver information systems, camera-based vision systems, connectivity and compliance products and electronic control units. The Stoneridge Brazil reportable segment designs and manufactures electronic vehicle tracking devices and monitoring services, vehicle security alarms and convenience accessories, in-vehicle audio and infotainment devices and telematics solutions. The accounting policies of the Company’s reportable segments are the same as those described in Note 2, “Summary of Significant Accounting Policies” of the Company’s 2020 Form 10-K The financial information presented below is for our three reportable operating segments and includes adjustments for unallocated corporate costs and intercompany eliminations, where applicable. Such costs and eliminations do not meet the requirements for being classified as an operating segment. Corporate costs include various support functions, such as corporate accounting/finance, executive administration, human resources, information technology and legal. A summary of financial information by reportable segment is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ Six months ended ​ ​ ​ June 30, ​ June 30, ​ ​ 2021 2020 2021 2020 ​ Net Sales: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ $ 86,345 ​ $ 47,005 ​ $ 185,963 ​ $ 143,855 ​ Inter-segment sales ​ ​ 374 ​ ​ 1,559 ​ ​ 2,354 ​ ​ 2,906 ​ Control Devices net sales ​ ​ 86,719 ​ ​ 48,564 ​ ​ 188,317 ​ ​ 146,761 ​ Electronics ​ ​ 90,085 ​ ​ 45,530 ​ ​ 172,855 ​ ​ 117,076 ​ Inter-segment sales ​ ​ 7,229 ​ ​ 2,042 ​ ​ 13,208 ​ ​ 10,310 ​ Electronics net sales ​ ​ 97,314 ​ ​ 47,572 ​ ​ 186,063 ​ ​ 127,386 ​ Stoneridge Brazil ​ ​ 14,904 ​ ​ 7,010 ​ ​ 26,311 ​ ​ 21,580 ​ Inter-segment sales ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ Stoneridge Brazil net sales ​ ​ 14,904 ​ ​ 7,010 ​ ​ 26,311 ​ ​ 21,580 ​ Eliminations ​ ​ (7,603) ​ ​ (3,601) ​ ​ (15,562) ​ ​ (13,216) ​ Total net sales ​ $ 191,334 ​ $ 99,545 ​ $ 385,129 ​ $ 282,511 ​ Operating Income (Loss): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ $ 37,065 ​ $ (9,656) ​ $ 47,230 ​ $ (2,334) ​ Electronics ​ ​ (1,807) ​ ​ (11,042) ​ ​ (2,680) ​ ​ (8,170) ​ Stoneridge Brazil ​ ​ (749) ​ ​ (879) ​ ​ (797) ​ ​ (20) ​ Unallocated Corporate (A) ​ ​ (7,825) ​ ​ (5,246) ​ ​ (15,010) ​ ​ (12,640) ​ Total operating income (loss) ​ $ 26,684 ​ $ (26,823) ​ $ 28,743 ​ $ (23,164) ​ Depreciation and Amortization: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ $ 3,858 ​ $ 3,639 ​ $ 7,937 ​ $ 7,169 ​ Electronics ​ ​ 3,059 ​ ​ 2,393 ​ ​ 5,868 ​ ​ 4,874 ​ Stoneridge Brazil ​ ​ 1,041 ​ ​ 1,273 ​ ​ 2,045 ​ ​ 2,723 ​ Unallocated Corporate ​ ​ 685 ​ ​ 496 ​ ​ 1,374 ​ ​ 1,022 ​ Total depreciation and amortization (B) ​ $ 8,643 ​ $ 7,801 ​ $ 17,224 ​ $ 15,788 ​ Interest Expense (Income), net: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ $ 108 ​ $ 89 ​ $ 240 ​ $ 170 ​ Electronics ​ ​ 164 ​ ​ 313 ​ ​ 295 ​ ​ 400 ​ Stoneridge Brazil ​ ​ (67) ​ ​ (7) ​ ​ (97) ​ ​ 3 ​ Unallocated Corporate ​ ​ 1,655 ​ ​ 1,015 ​ ​ 3,188 ​ ​ 1,867 ​ Total interest expense, net ​ $ 1,860 ​ $ 1,410 ​ $ 3,626 ​ $ 2,440 ​ Capital Expenditures: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ $ 3,380 ​ $ 3,349 ​ $ 4,741 ​ $ 5,663 ​ Electronics ​ ​ 461 ​ ​ 5,410 ​ ​ 3,911 ​ ​ 8,060 ​ Stoneridge Brazil ​ ​ 757 ​ ​ 281 ​ ​ 1,419 ​ ​ 1,414 ​ Unallocated Corporate (C) ​ ​ 197 ​ ​ 105 ​ ​ 698 ​ ​ 677 ​ Total capital expenditures ​ $ 4,795 ​ $ 9,145 ​ $ 10,769 ​ $ 15,814 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 ​ Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ ​ ​ ​ ​ ​ ​ $ 195,853 ​ $ 194,433 ​ Electronics ​ ​ ​ ​ ​ ​ ​ ​ 316,941 ​ ​ 303,914 ​ Stoneridge Brazil ​ ​ ​ ​ ​ ​ ​ ​ 63,643 ​ ​ 61,350 ​ Corporate (C) ​ ​ ​ ​ ​ ​ ​ ​ 386,827 ​ ​ 390,851 ​ Eliminations ​ ​ ​ ​ ​ ​ ​ ​ (327,332) ​ ​ (329,140) ​ Total assets ​ ​ ​ ​ ​ ​ ​ $ 635,932 ​ $ 621,408 ​ ​ The following tables present net sales and long-term assets for each of the geographic areas in which the Company operates: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ Six months ended ​ ​ ​ June 30, ​ June 30, ​ ​ 2021 2020 2021 2020 ​ Net Sales: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ North America ​ $ 96,700 ​ $ 43,122 ​ $ 193,234 ​ $ 142,973 ​ South America ​ ​ 14,904 ​ ​ 7,010 ​ ​ 26,311 ​ ​ 21,580 ​ Europe and Other ​ ​ 79,730 ​ ​ 49,413 ​ ​ 165,584 ​ ​ 117,958 ​ Total net sales ​ $ 191,334 ​ $ 99,545 ​ $ 385,129 ​ $ 282,511 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 ​ Long-term Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ North America ​ ​ ​ ​ ​ ​ ​ $ 98,482 ​ $ 110,330 ​ South America ​ ​ ​ ​ ​ ​ ​ ​ 34,505 ​ ​ 33,785 ​ Europe and Other ​ ​ ​ ​ ​ ​ ​ ​ 140,536 ​ ​ 142,629 ​ Total long-term assets ​ ​ ​ ​ ​ ​ ​ $ 273,523 ​ $ 286,744 ​ (A) Unallocated Corporate expenses include, among other items, accounting/finance, human resources, information technology and legal costs as well as share-based compensation. (B) These amounts represent depreciation and amortization on property, plant and equipment and certain intangible assets. (C) Assets located at Corporate consist primarily of cash, intercompany loan receivables, fixed assets for the corporate headquarter building, leased assets, information technology assets, equity investments and investments in subsidiaries.

Investments

Investments	6 Months Ended
	Jun. 30, 2021
Investments [Abstract]
Investments	(15) Investments Minda Stoneridge Instruments Ltd. The Company has a 49% equity interest in Minda Stoneridge Instruments Ltd. (“MSIL”), a company based in India that manufactures electronics, instrumentation equipment and sensors primarily for the motorcycle, commercial vehicle and automotive markets. The investment is accounted for under the equity method of accounting. The Company’s investment in MSIL, recorded as a component of investments and other long-term assets, net on the condensed consolidated balance sheets, was $14,414 and $13,547 at June 30, 2021 and December 31, 2020, respectively. Equity in earnings (loss) of MSIL included in the condensed consolidated statements of operations was $482 and $(231), for the three months ended June 30, 2021 and 2020, respectively. Equity in earnings of MSIL included in the condensed consolidated statements of operations was $912 and $226, for the six months ended June 30, 2021 and 2020, respectively. PST Eletrônica Ltda. The Company had a 74% controlling interest in Stoneridge Brazil from December 31, 2011 through May 15, 2017. On May 16, 2017, the Company acquired the remaining 26% noncontrolling interest in Stoneridge Brazil. As part of the acquisition agreement, the Company will be required to pay additional earn-out consideration, which is not capped, based on Stoneridge Brazil’s financial performance in 2021. See Note 5 for the fair value and foreign currency adjustments of the earn-out consideration for the current and prior periods. Stoneridge Brazil had dividends payable to former noncontrolling interest holders of R$24,154 ($6,010) as of December 31, 2019. The dividend payable related to Stoneridge Brazil was recorded within other current liabilities on the consolidated balance sheet as of December 31, 2019. These dividends were paid in January 2020. Other Investments In December 2018, the Company entered into an agreement to make a $10,000 investment in a fund (“Autotech Fund II”) managed by Autotech Ventures (“Autotech”), a venture capital firm focused on ground transportation technology which is accounted for under the equity method of accounting. The Company’s in distributions from the Autotech Fund II during the six months ended June 30, 2021. The Company contributed to the Autotech Fund II during the six months ended June 30, 2020. The Company has a

Disposals

Disposals	6 Months Ended
	Jun. 30, 2021
Disposals [Abstract]
Disposals	(16) Disposals Disposal of Particulate Matter Sensor Business On March 8, 2021, the Company entered into an Asset Purchase Agreement (the “APA”) by and among the Company, the Company’s wholly owned subsidiary, Stoneridge Electronics AS, as the Sellers, and Standard Motor Products, Inc. (“SMP”) and SMP Poland SP Z O.O., as the Buyers. Pursuant to the APA the Company agreed to sell to the Buyers the Company’s assets located in Lexington, Ohio and Tallinn, Estonia related to the manufacturing of particulate matter sensor products and related service part operations (together, the “PM sensor business”). In the past, the Company has sometimes referred to the PM sensor assets as the Company’s soot sensing business. The Buyers are not acquiring any of the Company’s locations or employees. The purchase price for the sale of the PM sensor assets was $4,000 (subject to a post-closing inventory adjustment which was a payment to SMP of $1,133) plus the assumption of certain liabilities. The purchase price was allocated among PM sensor product lines, Gen 1 and Gen 2 as defined under the APA. The purchase price allocated to Gen 1 fixed assets and inventory and Gen 2 fixed assets was $3,214 and $786, respectively. The sale of the Gen 2 assets will occur upon completion of the Company’s supply commitments to certain customers which are expected to be completed by December 31, 2021. The Company and SMP also entered into certain ancillary agreements, including a contract manufacturing agreement, a transitional services agreement, and a supply agreement, pursuant to which the Company will provide and be compensated for certain manufacturing, transitional, administrative and support services to SMP on a short-term basis. ​ On March 8, 2021 the Company’s Control Devices segment recognized net sales and cost of goods sold of $971 and $898, respectively, for the one-time sale of Gen 1 inventory and a gain on disposal of $740 for the sale of Gen 1 fixed assets less transaction costs of $60 within SG&A during the three months ended March 31, 2021. ​ Pursuant to the contract manufacturing agreement, the Company produced and sold PM sensor Gen 1 finished goods inventory to SMP for net sales of $2,292 in the three months ended June 30, 2021. In addition, the Company received $261 for services provided pursuant to the transition services agreement which were recognized as a reduction in SG&A for the three months ended June 30, 2021. Pursuant to the contract manufacturing agreement, the Company produced and sold PM sensor Gen 1 finished goods inventory to SMP for net sales of $3,070 in the six months ended June 30, 2021. In addition, the Company received $330 for services provided pursuant to the transition services agreement which were recognized as a reduction in SG&A for the six months ended June 30, 2021. ​ ​ PM sensor Gen 1 net sales to SMP pursuant to the contract manufacturing agreement were $2,292 and operating income was $416 for the three months ended June 30, 2021. PM sensor Gen 1 net sales and operating income were $1,382 and $114, respectively, for the three months ended June 30, 2020. PM sensor Gen 1 net sales, including sales of $3,070 to SMP pursuant to the contract manufacturing agreement and the one time sale of Gen 1 finished goods inventory of $971, and operating income were $6,307 and $867, respectively, for the six months ended June 30, 2021. PM sensor Gen 1 net sales and operating income were $3,763 and $70, respectively, for the six months ended June 30, 2020. ​ Sale of Canton Facility ​ On May 7, 2021, the Company, entered into a Real Estate Purchase and Sale Agreement (the “Agreement”) with Sun Life Assurance Company of Canada, a Canadian corporation (the “Buyer”), to sell the Canton Facility for $38,200 (subject to adjustment pursuant to the Agreement). ​ On June 17, 2021, pursuant to the Agreement, as amended after May 7, 2021, the Company closed the sale of the Canton Facility to the Buyer for an adjusted purchase price of $37,900. The Company recognized in the Control Devices segment, net proceeds of $35,167 and a gain, net of direct selling costs, of $30,718. ​

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue [Abstract]
Revenue by Segment and Geographical Location	The following tables disaggregate our revenue by reportable segment and geographical location (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ ​ Electronics ​ ​ Stoneridge Brazil ​ ​ Consolidated ​ Three months ended June 30 2021 2020 ​ 2021 2020 ​ 2021 2020 ​ 2021 2020 Net Sales: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ North America ​ $ 69,357 ​ $ 31,373 ​ ​ $ 27,343 ​ $ 11,749 ​ ​ $ - ​ $ - ​ ​ $ 96,700 ​ $ 43,122 ​ South America ​ - ​ - ​ ​ - ​ - ​ ​ 14,904 ​ 7,010 ​ ​ 14,904 ​ 7,010 ​ Europe ​ 2,843 ​ 4,434 ​ ​ 61,327 ​ 32,585 ​ ​ - ​ - ​ ​ 64,170 ​ 37,019 ​ Asia Pacific ​ 14,145 ​ 11,198 ​ ​ 1,415 ​ 1,196 ​ ​ - ​ - ​ ​ 15,560 ​ 12,394 ​ Total net sales ​ $ 86,345 ​ $ 47,005 ​ ​ $ 90,085 ​ $ 45,530 ​ ​ $ 14,904 ​ $ 7,010 ​ ​ $ 191,334 ​ $ 99,545 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following tables disaggregate our revenue by reportable segment and geographical location (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ ​ Electronics ​ ​ Stoneridge Brazil ​ ​ Consolidated Six months ended June 30 2021 2020 ​ 2021 2020 ​ 2021 2020 ​ 2021 2020 Net Sales: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ North America ​ $ 145,486 ​ $ 111,783 ​ ​ $ 47,748 ​ $ 31,190 ​ ​ $ - ​ $ - ​ ​ $ 193,234 ​ $ 142,973 South America ​ - ​ - ​ ​ - ​ - ​ ​ 26,311 ​ 21,580 ​ ​ 26,311 ​ 21,580 Europe ​ 9,633 ​ 11,822 ​ ​ 122,332 ​ 83,891 ​ ​ - ​ - ​ ​ 131,965 ​ 95,713 Asia Pacific ​ 30,844 ​ 20,250 ​ ​ 2,775 ​ 1,995 ​ ​ - ​ - ​ ​ 33,619 ​ 22,245 Total net sales ​ $ 185,963 ​ $ 143,855 ​ ​ $ 172,855 ​ $ 117,076 ​ ​ $ 26,311 ​ $ 21,580 ​ ​ $ 385,129 ​ $ 282,511 (1) Company sales based on geographic location are where the sale originates not where the customer is located .

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2021
Inventories [Abstract]
Schedule of Inventory, Current	​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ 2021 2020 Raw materials ​ $ 89,083 ​ $ 67,775 Work-in-progress ​ ​ 8,729 ​ ​ 7,005 Finished goods ​ ​ 16,998 ​ ​ 15,768 Total inventories, net ​ $ 114,810 ​ $ 90,548 ​

Financial Instruments and Fai_2

Financial Instruments and Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2021
Financial Instruments and Fair Value Measurements [Abstract]
Notional Amounts and Fair Values of Derivative Instruments in the Consolidated Balance	The notional amounts and fair values of derivative instruments in the condensed consolidated balance sheets were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Prepaid expenses ​ Accrued expenses and ​ ​ Notional amounts (A) ​ and other current assets ​ other current liabilities ​ ​ June 30, ​ December 31, ​ June 30, ​ December 31, ​ June 30, ​ December 31, ​ 2021 2020 2021 2020 2021 2020 Derivatives designated as hedging instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flow hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward currency contracts ​ $ 10,880 ​ $ 1,242 ​ $ 257 ​ $ 255 ​ $ - ​ $ - Interest rate swap ​ $ 50,000 ​ $ 50,000 ​ $ - ​ $ - ​ $ 995 ​ $ 1,318 (A) Notional amounts represent the gross contract of the derivatives outstanding in U.S. dollars.
Amounts Recorded for the Cash Flow Hedges in Other Comprehensive Income (Loss) in Shareholders' Equity and in Net Income	Gross amounts recorded for the cash flow hedges in other comprehensive (loss) income and in net income (loss) for the three months ended June 30 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain (loss) reclassified from ​ ​ Gain (loss) recorded in other ​ other comprehensive income ​ ​ comprehensive income (loss) ​ (loss) into net income (loss) (A) ​ 2021 2020 2021 2020 Derivatives designated as cash flow hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward currency contracts ​ $ 458 ​ $ 716 ​ $ 95 ​ $ (947) Interest rate swap ​ $ (37) ​ $ (245) ​ $ (163) ​ $ (114) (A) Gains (losses) reclassified from other comprehensive loss into net income (loss) recognized in selling, general and administrative expenses (“SG&A”) in the Company’s condensed consolidated statements of operations were $9 and $(235) for the three months ended June 30, 2021 and 2020, respectively. Gains (losses) reclassified from other comprehensive loss into net income (loss) recognized in cost of goods sold (“COGS”) in the Company’s condensed consolidated statements of operations were $86 and $(712) for the three months ended June 30, 2021 and 2020, respectively. Losses reclassified from other comprehensive loss into net income (loss) recognized in interest expense, net in the Company’s condensed consolidated statements of operations were $(163) and $(114) for the three months ended June 30, 2021 and 2020, respectively. ​ ​ Gross amounts recorded for the cash flow hedges in other comprehensive (loss) income and in net income (loss) for the six months ended June 30 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain (loss) reclassified from ​ ​ Gain (loss) recorded in other ​ other comprehensive income ​ ​ comprehensive income (loss) ​ (loss) into net income (loss) (A) ​ 2021 2020 2021 2020 Derivatives designated as cash flow hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward currency contracts ​ $ 304 ​ $ (2,604) ​ $ 302 ​ $ (1,103) Interest rate swap ​ $ 2 ​ $ (1,712) ​ $ (321) ​ $ (118) ​ (A) Gains (losses) reclassified from other comprehensive loss into net income (loss) recognized in SG&A in the Company’s condensed consolidated statements of operations were $89 and $(235) for the six months ended June 30, 2021 and 2020, respectively. Gains (losses) reclassified from other comprehensive loss into net income (loss) recognized in COGS in the Company’s condensed consolidated statements of operations were $213 and $(839) for the six months ended June 30, 2021 and 2020, respectively. Gains (losses) reclassified from other comprehensive loss income into net income (loss) recognized in design and development (“D&D”) in the Company’s condensed consolidated statements of operations were $0 and $(29) for the six months ended June 30, 2021 and 2020, respectively. Losses reclassified from other comprehensive loss into net income (loss) recognized in interest expense, net in the Company’s condensed consolidated statements of operations were $(321) and $(118) for the six months ended June 30, 2021 and 2020, respectively.
Schedule of Assets and Liabilities that are Measured at Fair Value on a Recurring Basis	The following table presents our assets and liabilities that are measured at fair value on a recurring basis and are categorized using the three levels of the fair value hierarchy based on the reliability of inputs used. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ ​ December 31, ​ ​ ​ ​ ​ 2021 ​ 2020 ​ ​ ​ ​ ​ Fair values estimated using ​ ​ ​ ​ ​ ​ Fair ​ Level 1 ​ Level 2 ​ Level 3 ​ ​ Fair ​ value inputs inputs inputs value Financial assets carried at fair value: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Forward currency contract ​ $ 257 ​ $ - ​ $ 257 ​ $ - ​ $ 255 Total financial assets carried at fair value ​ $ 257 ​ $ - ​ $ 257 ​ $ - ​ $ 255 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities carried at fair value: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap ​ ​ 995 ​ ​ - ​ ​ 995 ​ ​ - ​ ​ 1,318 Earn-out consideration ​ ​ 7,264 ​ ​ - ​ ​ - ​ ​ 7,264 ​ ​ 5,813 Total financial liabilities carried at fair value ​ $ 8,259 ​ $ - ​ $ 995 ​ $ 7,264 ​ $ 7,131
Summary of the Change in Fair Value of the Level 3 Financial Liabilities Related to Contingent Consideration	The following table sets forth a summary of the change in fair value of the Company’s Level 3 financial liabilities related to earn-out consideration that are measured at fair value on a recurring basis. ​ ​ ​ ​ ​ ​ ​ ​ ​ Stoneridge Brazil ​ 2021 2020 Balance at January 1 ​ $ 5,813 ​ $ 12,011 Change in fair value ​ ​ 1,215 ​ ​ (233) Foreign currency adjustments ​ ​ 236 ​ ​ (3,207) Balance at June 30 ​ $ 7,264 ​ $ 8,571 ​

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Debt [Abstract]
Schedule of Debt	Debt consisted of the following at June 30, 2021 and December 31, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ Interest rates at ​ ​ ​ 2021 2020 June 30, 2021 Maturity Revolving Credit Facility ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Credit Facility ​ $ 126,000 ​ $ 136,000 ​ 2.85% ​ June 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Debt ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Stoneridge Brazil short-term obligations ​ ​ 269 ​ ​ 1,561 ​ 8.80% ​ November 2021 Sweden short-term credit line ​ ​ 4 ​ ​ 1,591 ​ 2.60% ​ July 2021 Suzhou short-term credit line ​ ​ 4,182 ​ ​ 4,521 ​ 3.85% - 5.00% ​ August 2021 - May 2022 Total debt ​ ​ 4,455 ​ ​ 7,673 ​ ​ ​ ​ Less: current portion ​ ​ (4,455) ​ ​ (7,673) ​ ​ ​ ​ Total long-term debt, net ​ $ - ​ $ - ​ ​ ​ ​ ​

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Schedule of Weighted-Average Number of Shares	Weighted-average Common Shares outstanding used in calculating basic and diluted earnings per share were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ Six months ended ​ ​ ​ ​ June 30, ​ June 30, ​ ​ ​ 2021 2020 2021 2020 ​ ​ Basic weighted-average Common Shares outstanding ​ 27,137,207 ​ 26,952,336 ​ 27,077,152 ​ 27,092,186 ​ ​ Effect of dilutive shares ​ 295,210 ​ - ​ 364,844 ​ - ​ ​ Diluted weighted-average Common Shares outstanding ​ 27,432,417 ​ 26,952,336 ​ 27,441,996 ​ 27,092,186 ​ ​

Equity and Accumulated Other _2

Equity and Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2021
Equity and Accumulated Other Comprehensive Loss [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss by Component	Changes in accumulated other comprehensive loss for the three months ended June 30, 2021 and 2020 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ Unrealized ​ ​ ​ ​ ​ ​ currency ​ ​ gain (loss) ​ ​ ​ ​ ​ translation ​ on derivatives ​ Total Balance at April 1, 2021 ​ $ (99,573) ​ $ (969) ​ $ (100,542) Other comprehensive income before reclassifications ​ ​ 7,172 ​ ​ 332 ​ ​ 7,504 Amounts reclassified from accumulated other comprehensive loss ​ ​ - ​ ​ 54 ​ ​ 54 Net other comprehensive income, net of tax ​ ​ 7,172 ​ ​ 386 ​ ​ 7,558 Balance at June 30, 2021 ​ $ (92,401) ​ $ (583) ​ $ (92,984) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at April 1, 2020 ​ $ (108,591) ​ $ (3,655) ​ $ (112,246) Other comprehensive income before reclassifications ​ ​ 1,821 ​ ​ 372 ​ ​ 2,193 Amounts reclassified from accumulated other comprehensive loss ​ ​ - ​ ​ 838 ​ ​ 838 Net other comprehensive income, net of tax ​ ​ 1,821 ​ ​ 1,210 ​ ​ 3,031 Balance at June 30, 2020 ​ $ (106,770) ​ $ (2,445) ​ $ (109,215) ​ ​ ​ ​ ​ ​ Changes in accumulated other comprehensive loss for the six months ended June 30, 2021 and 2020 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ Unrealized ​ ​ ​ ​ ​ currency ​ gain (loss) ​ ​ ​ ​ translation on derivatives Total Balance at January 1, 2021 ​ $ (88,795) ​ $ (840) ​ $ (89,635) Other comprehensive (loss) income before reclassifications ​ ​ (3,606) ​ ​ 242 ​ ​ (3,364) Amounts reclassified from accumulated other comprehensive loss ​ ​ - ​ ​ 15 ​ ​ 15 Net other comprehensive (loss) income, net of tax ​ ​ (3,606) ​ ​ 257 ​ ​ (3,349) Balance at June 30, 2021 ​ $ (92,401) ​ $ (583) ​ $ (92,984) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at January 1, 2020 ​ $ (91,472) ​ $ - ​ $ (91,472) Other comprehensive loss before reclassifications ​ ​ (15,298) ​ ​ (3,410) ​ ​ (18,708) Amounts reclassified from accumulated other comprehensive loss ​ ​ - ​ ​ 965 ​ ​ 965 Net other comprehensive loss, net of tax ​ ​ (15,298) ​ ​ (2,445) ​ ​ (17,743) Balance at June 30, 2020 ​ $ (106,770) ​ $ (2,445) ​ $ (109,215) ​

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies [Abstract]
Schedule of Product Warranty and Recall Liability	​ ​ ​ ​ ​ The following provides a reconciliation of changes in product warranty and recall liability: ​ ​ ​ ​ ​ ​ ​ Six months ended June 30 2021 2020 Product warranty and recall at beginning of period ​ $ 12,691 ​ $ 10,796 Accruals for warranties established during period ​ ​ 3,092 ​ ​ 3,201 Aggregate changes in pre-existing liabilities due to claim developments ​ ​ 223 ​ ​ 614 Settlements made during the period ​ ​ (5,889) ​ ​ (3,375) Foreign currency translation ​ ​ (169) ​ ​ (173) Product warranty and recall at end of period ​ $ 9,948 ​ $ 11,063

Business Realignment and Rest_2

Business Realignment and Restructuring (Tables)	6 Months Ended
	Jun. 30, 2021
Schedule of Restructuring and Related Costs	Business realignment charges by reportable segment were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ ​ Six months ended ​ ​ ​ June 30, ​ ​ June 30, ​ 2021 2020 2021 2020 Control Devices (A) ​ $ - ​ $ 1,042 ​ $ 192 ​ $ 1,419 Electronics (B) ​ ​ 1 ​ ​ 1,305 ​ ​ 13 ​ ​ 1,305 Stoneridge Brazil (C) ​ ​ 59 ​ ​ - ​ ​ 59 ​ ​ 153 Unallocated Corporate (D) ​ ​ - ​ ​ 236 ​ ​ 42 ​ ​ 310 Total business realignment charges ​ $ 60 ​ $ 2,583 ​ $ 306 ​ $ 3,187 ​ (A) Severance costs for the three months ended June 30, 2020 related to COGS, D&D and SG&A were $603 , $249 and $190 , respectively. Severance costs for the six months ended June 30, 2021 related to SG&A were $192 . Severance costs for the six months ended June 30, 2020 related to COGS, D&D and SG&A were $603 , $249 and $567 , respectively. (B) Severance costs for the three months ended June 30, 2021 related to D&D were $1, respectively. Severance costs for the six months ended June 30, 2021 related to SG&A and D&D were $(22) and $35 , respectively. Severance costs for the three and six months ended June 30, 2020 related to COGS, D&D and SG&A were $323 , $228 and $754 , respectively. (C) Severance costs for the three and six months ended June 30, 2021 related to COGS and SG&A were $7 and $52 , respectively. Severance costs for the six months ended June 30, 2020 related to COGS and SG&A were $86 and $67, respectively. (D) Severance costs for the three months ended 2020 related to SG&A were $236 . Severance costs for the six months ended June 30, 2021 and 2020 related to SG&A were $42 and $310 , respectively.
Schedule of Business Realignment Charges Classified by Statement of Operations	Business realignment charges classified by statement of operations line item were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ ​ Six months ended ​ ​ ​ June 30, ​ ​ June 30, ​ 2021 2020 2021 2020 Cost of goods sold ​ $ 7 ​ $ 926 ​ $ 7 ​ $ 1,012 Selling, general and administrative ​ ​ 52 ​ ​ 1,180 ​ ​ 264 ​ ​ 1,698 Design and development ​ ​ 1 ​ ​ 477 ​ ​ 35 ​ ​ 477 Total business realignment charges ​ $ 60 ​ $ 2,583 ​ $ 306 ​ $ 3,187
Particulate Matter Product Line Strategic Exit [Member]
Schedule of Restructuring and Related Costs	​ ​ ​ The expenses for the exit of the PM sensor line that relate to the Control Devices reportable segment include the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2021 Charge ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2021 ​ to Expense ​ Cash ​ Non-Cash ​ June 30, 2021 Fixed asset impairment and ​ $ - ​ $ 185 ​ $ - ​ $ (185) ​ $ - Employee termination benefits ​ ​ - ​ ​ 76 ​ ​ (76) ​ ​ - ​ ​ - Other related costs ​ ​ - ​ ​ 1,393 ​ ​ (1,393) ​ ​ - ​ ​ - Total ​ $ - ​ $ 1,654 ​ $ (1,469) ​ $ (185) ​ $ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2020 Charge ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2020 ​ to Expense ​ Cash ​ Non-Cash ​ June 30, 2020 Fixed asset impairment and ​ $ - ​ $ 2,482 ​ $ - ​ $ (2,482) ​ $ - Other related costs ​ ​ - ​ ​ 70 ​ ​ (70) ​ ​ - ​ ​ - Total ​ $ - ​ $ 2,552 ​ $ (70) ​ $ (2,482) ​ $ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Canton Facility Restructuring Plan [Member]
Schedule of Restructuring and Related Costs	The expenses for the Canton Restructuring that relate to the Control Devices reportable segment include the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2021 Charge ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2021 ​ to Expense ​ Cash ​ Non-Cash ​ June 30, 2021 Employee termination benefits ​ $ 165 ​ $ - ​ $ (25) ​ $ - ​ $ 140 Other related costs ​ ​ - ​ ​ 13 ​ ​ (13) ​ ​ - ​ ​ - Total ​ $ 165 ​ $ 13 ​ $ (38) ​ $ - ​ $ 140 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2020 Charge ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2020 ​ to Expense ​ Cash ​ Non-Cash ​ June 30, 2020 Employee termination benefits ​ $ 2,636 ​ $ 1,119 ​ $ (3,755) ​ $ - ​ $ - Other related costs ​ ​ - ​ ​ 1,564 ​ ​ (1,564) ​ ​ - ​ ​ - Total ​ $ 2,636 ​ $ 2,683 ​ $ (5,319) ​ $ - ​ $ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Electronics [Member]
Schedule of Restructuring and Related Costs	The expenses for the restructuring activities that relate to the Electronics reportable segment include the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2021 Charge to ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2021 ​ Expense ​ Cash ​ Non-Cash ​ June 30, 2021 Employee termination benefits ​ $ 227 ​ $ 50 ​ $ (212) ​ $ - ​ $ 65 Other related costs ​ ​ - ​ ​ 170 ​ ​ (170) ​ ​ - ​ ​ - Total ​ $ 227 ​ $ 220 ​ $ (382) ​ $ - ​ $ 65 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual as of ​ 2020 Charge to ​ ​ Utilization ​ Accrual as of ​ ​ January 1, 2020 ​ Expense ​ Cash ​ Non-Cash ​ June 30, 2020 Employee termination benefits ​ $ 52 ​ $ 863 ​ $ (319) ​ $ - ​ $ 596 Contract termination costs ​ ​ - ​ ​ 452 ​ ​ (452) ​ ​ - ​ ​ - Other related costs ​ ​ - ​ ​ 313 ​ ​ (313) ​ ​ - ​ ​ - Total ​ $ 52 ​ $ 1,628 ​ $ (1,084) ​ $ - ​ $ 596 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	A summary of financial information by reportable segment is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ Six months ended ​ ​ ​ June 30, ​ June 30, ​ ​ 2021 2020 2021 2020 ​ Net Sales: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ $ 86,345 ​ $ 47,005 ​ $ 185,963 ​ $ 143,855 ​ Inter-segment sales ​ ​ 374 ​ ​ 1,559 ​ ​ 2,354 ​ ​ 2,906 ​ Control Devices net sales ​ ​ 86,719 ​ ​ 48,564 ​ ​ 188,317 ​ ​ 146,761 ​ Electronics ​ ​ 90,085 ​ ​ 45,530 ​ ​ 172,855 ​ ​ 117,076 ​ Inter-segment sales ​ ​ 7,229 ​ ​ 2,042 ​ ​ 13,208 ​ ​ 10,310 ​ Electronics net sales ​ ​ 97,314 ​ ​ 47,572 ​ ​ 186,063 ​ ​ 127,386 ​ Stoneridge Brazil ​ ​ 14,904 ​ ​ 7,010 ​ ​ 26,311 ​ ​ 21,580 ​ Inter-segment sales ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ Stoneridge Brazil net sales ​ ​ 14,904 ​ ​ 7,010 ​ ​ 26,311 ​ ​ 21,580 ​ Eliminations ​ ​ (7,603) ​ ​ (3,601) ​ ​ (15,562) ​ ​ (13,216) ​ Total net sales ​ $ 191,334 ​ $ 99,545 ​ $ 385,129 ​ $ 282,511 ​ Operating Income (Loss): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ $ 37,065 ​ $ (9,656) ​ $ 47,230 ​ $ (2,334) ​ Electronics ​ ​ (1,807) ​ ​ (11,042) ​ ​ (2,680) ​ ​ (8,170) ​ Stoneridge Brazil ​ ​ (749) ​ ​ (879) ​ ​ (797) ​ ​ (20) ​ Unallocated Corporate (A) ​ ​ (7,825) ​ ​ (5,246) ​ ​ (15,010) ​ ​ (12,640) ​ Total operating income (loss) ​ $ 26,684 ​ $ (26,823) ​ $ 28,743 ​ $ (23,164) ​ Depreciation and Amortization: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ $ 3,858 ​ $ 3,639 ​ $ 7,937 ​ $ 7,169 ​ Electronics ​ ​ 3,059 ​ ​ 2,393 ​ ​ 5,868 ​ ​ 4,874 ​ Stoneridge Brazil ​ ​ 1,041 ​ ​ 1,273 ​ ​ 2,045 ​ ​ 2,723 ​ Unallocated Corporate ​ ​ 685 ​ ​ 496 ​ ​ 1,374 ​ ​ 1,022 ​ Total depreciation and amortization (B) ​ $ 8,643 ​ $ 7,801 ​ $ 17,224 ​ $ 15,788 ​ Interest Expense (Income), net: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ $ 108 ​ $ 89 ​ $ 240 ​ $ 170 ​ Electronics ​ ​ 164 ​ ​ 313 ​ ​ 295 ​ ​ 400 ​ Stoneridge Brazil ​ ​ (67) ​ ​ (7) ​ ​ (97) ​ ​ 3 ​ Unallocated Corporate ​ ​ 1,655 ​ ​ 1,015 ​ ​ 3,188 ​ ​ 1,867 ​ Total interest expense, net ​ $ 1,860 ​ $ 1,410 ​ $ 3,626 ​ $ 2,440 ​ Capital Expenditures: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ $ 3,380 ​ $ 3,349 ​ $ 4,741 ​ $ 5,663 ​ Electronics ​ ​ 461 ​ ​ 5,410 ​ ​ 3,911 ​ ​ 8,060 ​ Stoneridge Brazil ​ ​ 757 ​ ​ 281 ​ ​ 1,419 ​ ​ 1,414 ​ Unallocated Corporate (C) ​ ​ 197 ​ ​ 105 ​ ​ 698 ​ ​ 677 ​ Total capital expenditures ​ $ 4,795 ​ $ 9,145 ​ $ 10,769 ​ $ 15,814 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 ​ Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Control Devices ​ ​ ​ ​ ​ ​ ​ $ 195,853 ​ $ 194,433 ​ Electronics ​ ​ ​ ​ ​ ​ ​ ​ 316,941 ​ ​ 303,914 ​ Stoneridge Brazil ​ ​ ​ ​ ​ ​ ​ ​ 63,643 ​ ​ 61,350 ​ Corporate (C) ​ ​ ​ ​ ​ ​ ​ ​ 386,827 ​ ​ 390,851 ​ Eliminations ​ ​ ​ ​ ​ ​ ​ ​ (327,332) ​ ​ (329,140) ​ Total assets ​ ​ ​ ​ ​ ​ ​ $ 635,932 ​ $ 621,408 ​
Schedule Of Revenue From External Customers and Long-Lived Assets, By Geographical Areas [Table Text Block]	The following tables present net sales and long-term assets for each of the geographic areas in which the Company operates: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ Six months ended ​ ​ ​ June 30, ​ June 30, ​ ​ 2021 2020 2021 2020 ​ Net Sales: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ North America ​ $ 96,700 ​ $ 43,122 ​ $ 193,234 ​ $ 142,973 ​ South America ​ ​ 14,904 ​ ​ 7,010 ​ ​ 26,311 ​ ​ 21,580 ​ Europe and Other ​ ​ 79,730 ​ ​ 49,413 ​ ​ 165,584 ​ ​ 117,958 ​ Total net sales ​ $ 191,334 ​ $ 99,545 ​ $ 385,129 ​ $ 282,511 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 ​ Long-term Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ North America ​ ​ ​ ​ ​ ​ ​ $ 98,482 ​ $ 110,330 ​ South America ​ ​ ​ ​ ​ ​ ​ ​ 34,505 ​ ​ 33,785 ​ Europe and Other ​ ​ ​ ​ ​ ​ ​ ​ 140,536 ​ ​ 142,629 ​ Total long-term assets ​ ​ ​ ​ ​ ​ ​ $ 273,523 ​ $ 286,744 ​ (A) Unallocated Corporate expenses include, among other items, accounting/finance, human resources, information technology and legal costs as well as share-based compensation. (B) These amounts represent depreciation and amortization on property, plant and equipment and certain intangible assets. (C) Assets located at Corporate consist primarily of cash, intercompany loan receivables, fixed assets for the corporate headquarter building, leased assets, information technology assets, equity investments and investments in subsidiaries.

Basis of Presentation (Narrativ

Basis of Presentation (Narrative) (Details)	Jun. 30, 2021	Jun. 30, 2020
MSIL
Schedule of Equity Method Investments [Line Items]
Ownership percentage	49.00%	49.00%

Recently Issued Accounting St_2

Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of a accounting change	$ 313,630	$ 284,672	$ 296,634	$ 249,262	$ 267,293	$ 289,904
Right of use assets	$ 16,780		18,944
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of a accounting change			$ 13,750

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Revenue [Abstract]
Contract assets	$ 0	$ 0
Contract liabilities	0	0
Capitalized contract acquisition costs	$ 0	$ 0

Revenue (Revenue by Segment and

Revenue (Revenue by Segment and Geographical Location) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total net sales	$ 191,334	$ 99,545	$ 385,129	$ 282,511
North America [Member]
Disaggregation of Revenue [Line Items]
Total net sales	96,700	43,122	193,234	142,973
South America [Member]
Disaggregation of Revenue [Line Items]
Total net sales	14,904	7,010	26,311	21,580
Europe [Member]
Disaggregation of Revenue [Line Items]
Total net sales	64,170	37,019	131,965	95,713
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Total net sales	15,560	12,394	33,619	22,245
Control Devices [Member]
Disaggregation of Revenue [Line Items]
Total net sales	86,345	47,005	185,963	143,855
Control Devices [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Total net sales	69,357	31,373	145,486	111,783
Control Devices [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Total net sales	2,843	4,434	9,633	11,822
Control Devices [Member] | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Total net sales	14,145	11,198	30,844	20,250
Electronics [Member]
Disaggregation of Revenue [Line Items]
Total net sales	90,085	45,530	172,855	117,076
Electronics [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Total net sales	27,343	11,749	47,748	31,190
Electronics [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Total net sales	61,327	32,585	122,332	83,891
Electronics [Member] | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Total net sales	1,415	1,196	2,775	1,995
Stoneridge Brazil [Member]
Disaggregation of Revenue [Line Items]
Total net sales	14,904	7,010	26,311	21,580
Stoneridge Brazil [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Total net sales	$ 14,904	$ 7,010	$ 26,311	$ 21,580

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Inventories [Abstract]
Inventory amount, FIFO	$ 102,433	$ 82,308
Inventory amount, weighted average cost	$ 12,377	$ 8,240

Inventories (Schedule of Invent

Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Inventories [Abstract]
Raw materials	$ 89,083	$ 67,775
Work-in-progress	8,729	7,005
Finished goods	16,998	15,768
Total inventories, net	$ 114,810	$ 90,548

Financial Instruments and Fai_3

Financial Instruments and Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Feb. 18, 2020
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Borrowings outstanding	$ 126,000		$ 126,000		$ 136,000
Interest expense	1,860	$ 1,410	3,626	$ 2,440
Payment of earn-out consideration paid within operating activities			1,215	(233)
Transfers in or out of Level 3			0
Cash Flow Hedging [Member] | U.S. Dollar Denominated Foreign Currency Forward Contracts Euro Functional Currency [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	0	1,400	0	1,400	0
Cash Flow Hedging [Member] | Mexican Peso-Denominated Foreign Currency Forward Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	10,880		10,880		1,242
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts						$ 50,000
Interest expense	163	114	321	118
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Credit Facility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Borrowings outstanding	126,000		126,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Forward Currency Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	10,880		10,880		1,242
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	50,000		50,000		50,000
Electronics [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Interest expense	164	313	295	400
Control Devices [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Interest expense	$ 108	$ 89	$ 240	$ 170
Control Devices [Member] | Particulate Matter Fixed Assets [Member] | Tallinn, Estonia Facility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Asset impairments					2,326
Control Devices [Member] | Selling, General and Administrative Expenses [Member] | Particulate Matter Fixed Assets [Member] | Tallinn, Estonia Facility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Asset impairments					$ 2,326

Financial Instruments and Fai_4

Financial Instruments and Fair Value Measurements (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Feb. 18, 2020
Forward Currency Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional amounts	$ 10,880	$ 1,242
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amounts			$ 50,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional amounts	50,000	50,000
Prepaid Expenses and Other Current Assets [Member] | Forward Currency Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Financial assets carried at fair value	257	255
Accrued Expenses and Other Current Liabilities [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Financial liabilities carried at fair value	$ 995	$ 1,318

Financial Instruments and Fai_5

Financial Instruments and Fair Value Measurements (Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)) (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Forward Currency Contracts [Member]
Derivatives designated as cash flow hedges:
Gain (loss) recorded in other comprehensive income (loss)	$ 458	$ 716	$ 304	$ (2,604)
Gain (loss) reclassified from other comprehensive income (loss) into net income	95	(947)	302	(1,103)
Foreign currency cash flow hedge gain (loss) to be reclassified during next 12 months	(257)		(257)
Losses expected to be recognized in interest expense in next year			596
Losses expected to be recognized in interest expense after next year			399
Interest Rate Swap [Member]
Derivatives designated as cash flow hedges:
Gain (loss) recorded in other comprehensive income (loss)	(37)	(245)	2	(1,712)
Gain (loss) reclassified from other comprehensive income (loss) into net income	(163)	(114)	(321)	(118)
Cost of Goods Sold [Member] | Forward Currency Contracts [Member]
Derivatives designated as cash flow hedges:
Gain (loss) reclassified from other comprehensive income (loss) into net income	86	(712)	213	(839)
Design and Development Expense [Member] | Forward Currency Contracts [Member]
Derivatives designated as cash flow hedges:
Gain (loss) reclassified from other comprehensive income (loss) into net income			0	(29)
Selling, General and Administrative Expenses [Member] | Forward Currency Contracts [Member]
Derivatives designated as cash flow hedges:
Gain (loss) reclassified from other comprehensive income (loss) into net income	9	(235)	89	(235)
Interest Expense [Member] | Forward Currency Contracts [Member]
Derivatives designated as cash flow hedges:
Gain (loss) reclassified from other comprehensive income (loss) into net income	$ (163)	$ (114)	$ (321)	$ (118)

Financial Instruments and Fai_6

Financial Instruments and Fair Value Measurements (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Recurring [Member]
Financial assets carried at fair value:
Forward currency asset contracts	$ 257	$ 255
Total financial assets carried at fair value	257	255
Financial liabilities carried at fair value:
Interest rate swap	995	1,318
Earn-out consideration	7,264	5,813
Total financial liabilities carried at fair value	8,259	$ 7,131
Fair Value, Inputs, Level 2 [Member]
Financial assets carried at fair value:
Forward currency asset contracts	257
Total financial assets carried at fair value	257
Financial liabilities carried at fair value:
Interest rate swap	995
Total financial liabilities carried at fair value	995
Fair Value, Inputs, Level 3 [Member]
Financial liabilities carried at fair value:
Earn-out consideration	7,264
Total financial liabilities carried at fair value	$ 7,264

Financial Instruments and Fai_7

Financial Instruments and Fair Value Measurements (Summary of the change in fair value of the Level 3 financial liabilities related to earn-out consideration) (Details) - Stoneridge Brazil [Member] - Earnout Consideration [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liability, Beginning balance	$ 5,813	$ 12,011
Change in fair value	1,215	(233)
Foreign currency adjustments	236	(3,207)
Financial liability, Ending balance	$ 7,264	$ 8,571

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1,599	$ 733	$ 2,761	$ 2,110

Debt (Narrative) (Details)

Debt (Narrative) (Details) ¥ in Thousands, kr in Thousands, $ in Thousands

Jun. 30, 2020

Jun. 30, 2021USD ($)

Jun. 30, 2021SEK (kr)

Jun. 30, 2020USD ($)

Jun. 30, 2021SEK (kr)

Jun. 30, 2021CNY (¥)

Mar. 31, 2021

Dec. 31, 2020USD ($)

Dec. 31, 2020SEK (kr)

Dec. 31, 2020CNY (¥)

Jun. 26, 2020USD ($)

Jun. 05, 2019USD ($)

Debt Instrument [Line Items]

Borrowings outstanding

$ 126,000

$ 136,000

Subsidiary borrowed

30,000

$ 71,500

Repayments of credit line

40,000

$ 36,500

Cash and cash equivalents

55,587

73,919

Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

$ 400,000

Increase in maximum borrowing capacity of credit facility

$ 150

Borrowings outstanding

126,000

136,000

Debt instrument covenant default of other debt maximum amount

30,000

Debt instrument covenant uninsured asset losses maximum amount

$ 30,000

Revolving Credit Facility [Member] | Minimum [Member]

Debt Instrument [Line Items]

Long-term debt, weighted average interest rate

2.85%

2.85%

2.85%

Suzhou Short-Term Credit Line [Member]

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

$ 7,744

¥ 50,000

7,663

Borrowings outstanding

$ 4,182

$ 4,521

Outstanding credit lines weighted-average interest rate

4.24%

4.24%

4.24%

4.32%

4.32%

4.32%

Suzhou Short-Term Credit Line [Member] | Maximum [Member]

Debt Instrument [Line Items]

Outstanding credit lines interest rate

5.00%

5.00%

Suzhou Short-Term Credit Line [Member] | Minimum [Member]

Debt Instrument [Line Items]

Outstanding credit lines interest rate

3.85%

3.85%

Bank Acceptance Draft Credit Line [Member]

Debt Instrument [Line Items]

Credit facility, borrowing capacity

$ 2,323

¥ 15,000

$ 2,299

¥ 15,000

Borrowings outstanding

594

414

Letter of Credit [Member]

Debt Instrument [Line Items]

Outstanding letters of credit

$ 1,703

$ 1,720

Stoneridge Brazil Short-Term Notes [Member]

Debt Instrument [Line Items]

Short-term debt, weighted average interest rate

8.80%

8.80%

8.80%

Credit Facility [Member]

Debt Instrument [Line Items]

Credit Facility covenant compliance

The Company was in compliance with all credit facility covenants at June 30, 2021 and December 31, 2020

The Company was in compliance with all credit facility covenants at June 30, 2021 and December 31, 2020

Amendment Number One [Member] | Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Capitalized deferred financing costs

$ 1,086

Credit facility required minimum liquidity

$ 150,000

Amendment Number One [Member] | Revolving Credit Facility [Member] | Quarter Ended December 31, 2020 [Member]

Debt Instrument [Line Items]

Minimum interest coverage ratio

275.00%

275.00%

275.00%

Amendment Number One [Member] | Revolving Credit Facility [Member] | Quarter Ended March 31, 2021 [Member]

Debt Instrument [Line Items]

Minimum interest coverage ratio

325.00%

Amendment Number One [Member] | Revolving Credit Facility [Member] | Quarters Ended After March 31, 2021 [Member]

Debt Instrument [Line Items]

Minimum interest coverage ratio

350.00%

Amendment Number One [Member] | Revolving Credit Facility [Member] | Maximum [Member]

Debt Instrument [Line Items]

Cash and cash equivalents

$ 130,000

Amendment Number One [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]

Debt Instrument [Line Items]

Basis spread on variable rate

0.50%

Amendment Three [Member] | Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

300,000

Stoneridge Brazil [Member] | Term Loan [Member]

Debt Instrument [Line Items]

Principal repayment in next twelve months

269

Specified Hedge Borrowings [Member] | Amendment Number One [Member] | Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Borrowings outstanding

50,000

Specified Hedge Borrowings [Member] | Amendment Number One [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]

Debt Instrument [Line Items]

Basis spread on variable rate

0.00%

Electronics [Member] | Line of Credit [Member]

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

2,339

kr 20,000

$ 2,435

kr 20,000

Borrowings outstanding

$ 1,591

kr 13,072

Subsidiary borrowed

19,950

kr 170,613

Repayments of credit line

21,474

kr 183,649

Electronics [Member] | Letter of Credit [Member]

Debt Instrument [Line Items]

Borrowings outstanding

$ 4

kr 36

Debt (Schedule of Debt) (Detail

Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Revolving credit facility	$ 126,000	$ 136,000
Debt:
Total debt	4,455	7,673
Less: current portion	(4,455)	(7,673)
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 126,000	136,000
Debt:
Debt, maturity	June 2024
Suzhou Short-Term Credit Line [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 4,182	4,521
Debt:
Debt, maturity	August 2021 - May 2022
Maximum [Member] | Suzhou Short-Term Credit Line [Member]
Debt:
Outstanding credit lines interest rate	5.00%
Minimum [Member] | Revolving Credit Facility [Member]
Debt:
Long-term debt, weighted average interest rate	2.85%
Minimum [Member] | Suzhou Short-Term Credit Line [Member]
Debt:
Outstanding credit lines interest rate	3.85%
Sweden Short-Term Note [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 4	1,591
Debt:
Debt, maturity	July 2021
Outstanding credit lines interest rate	2.60%
Stoneridge Brazil Short-Term Obligations [Member]
Debt Instrument [Line Items]
Short-term debt	$ 269	$ 1,561
Debt:
Debt, maturity	November 2021
Short-term debt, weighted average interest rate	8.80%

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Lessor, Lease, Description [Line Items]
Property, plant and equipment, net	$ 112,055	$ 112,055	$ 119,324
Operating lease income	282	602
Variable lease income	$ 100	$ 199
Control Devices [Member]
Lessor, Lease, Description [Line Items]
Lessor, option to extend		until the time of the sale.

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2021
Antidilutive securities excluded from computation of earnings per share	204,461	276,360
Performance Based Right to Receive Common Shares [Member]
Common shares, non-vested	771,854	771,854	747,545

Earnings Per Share (Weighted Av

Earnings Per Share (Weighted Average Shares Outstanding Used in Calculating Basic and Diluted Net Income Per Share) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Basic weighted-average Common Shares outstanding	27,137,207	26,952,336	27,077,152	27,092,186
Effect of dilutive shares	295,210		364,844
Diluted weighted-average Common Shares outstanding	27,432,417	26,952,336	27,441,996	27,092,186

Equity and Accumulated Other _3

Equity and Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended
	Jun. 30, 2021		Mar. 31, 2021	Jun. 30, 2020		Mar. 31, 2020	Jun. 30, 2021		Jun. 30, 2020		Dec. 31, 2020	Dec. 31, 2019
Equity and Accumulated Other Comprehensive Loss [Abstract]
Foreign currency translation, Beginning balance	$ (99,573)		$ (88,795)	$ (108,591)		$ (91,472)	$ (88,795)		$ (91,472)
Foreign currency translation, Other comprehensive income (loss) before reclassifications	7,172			1,821			(3,606)		(15,298)
Foreign currency translation, Net other comprehensive income (loss), net of tax	7,172			1,821			(3,606)		(15,298)
Foreign currency translation, Ending balance	(92,401)		(99,573)	(106,770)		(108,591)	(92,401)		(106,770)
Unrealized gain (loss) on on derivatives, Beginning balance	(969)		(840)	(3,655)		0	(840)		0
Unrealized gain (loss) on on derivatives, Other comprehensive income (loss) before reclassifications	332			372			242		(3,410)
Unrealized gain (loss) on on derivatives, Amounts reclassified from accumulated other comprehensive loss	54			838			15		965
Unrealized gain (loss) on on derivatives, Net other comprehensive income (loss), net of tax	386	[1]	(129)	1,210	[1]	(3,655)	257	[1]	(2,445)	[1]
Unrealized gain (loss) on on derivatives, Ending balance	(583)		(969)	(2,445)		(3,655)	(583)		(2,445)
Total, Other comprehensive income (loss) before reclassifications	7,504			2,193			(3,364)		(18,708)
Total, Amounts reclassified from accumulated other comprehensive loss	54			838			15		965
Total, Net other comprehensive income (loss), net of tax	7,558			3,031			(3,349)		(17,743)
Accumulated other comprehensive income (loss), net of tax, total	$ (92,984)		$ (100,542)	$ (109,215)		$ (112,246)	$ (92,984)		$ (109,215)		$ (89,635)	$ (91,472)
[1]	Net of tax expense of $103 and $322 for the three months ended June 30, 2021 and 2020, respectively. Net of tax expense (benefit) of $68 and $(650) for the six months ended June 30, 2021 and 2020, respectively.

Equity and Accumulated Other _4

Equity and Accumulated Other Comprehensive Loss Common Share Repurchase (Details) - USD ($) $ in Thousands	Mar. 06, 2020	Feb. 25, 2020	Feb. 24, 2020	May 07, 2019	Jun. 30, 2020	Mar. 03, 2020	Oct. 26, 2018
Stock Repurchase Program, Authorized Amount			$ 50,000				$ 50,000
Payments for repurchase of common stock					$ 4,995
Weighted average price of common shares		364,604
Period over which shares will be repurchased			18 months
Accelerated Share Repurchase Agreement [Member]
Payments for repurchase of common stock				$ 50,000
Stock repurchased and retired during period, shares				1,349,528
Percentage of expected shares repurchased				80.00%
Treasury stock, retired, cost method, amount				$ 40,000
Equity increase (decrease) related to shares repurchase program.				$ 10,000
Agreement Letter 10b18 [Member]
Stock Repurchase Program, Authorized Amount						$ 5,000
Treasury stock, retired, cost method, amount	$ 4,995
Total company common shares	242,634
Treasury shares
Treasury stock, retired, cost method, amount		$ (10,000)
Additional Paid-In Capital
Treasury stock, retired, cost method, amount		$ 10,000
Additional Paid-In Capital | Agreement Letter 10b18 [Member]
Treasury stock, retired, cost method, amount	$ 4,995

Commitments and Contingencies_2

Commitments and Contingencies (Narrative) (Details) R$ in Thousands, $ in Thousands	Aug. 12, 2020USD ($)	Aug. 12, 2020BRL (R$)	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)	Jun. 30, 2021BRL (R$)	Dec. 31, 2020BRL (R$)
Short-term Debt [Line Items]
Environmental remediation accrued undiscounted liability			$ 529		$ 529		$ 180
Groundwater remediation expense			0	$ 103	407	$ 105
Product warranty and recall accrual			3,186		3,186		3,647
Selling, General and Administrative Expenses [Member]
Short-term Debt [Line Items]
Gain on litigation							6,473
Accrued Expenses and Other Current Liabilities [Member]
Short-term Debt [Line Items]
Environmental remediation accrued undiscounted liability			353		353		180
Letter of Credit [Member]
Short-term Debt [Line Items]
Line of credit			1,489		1,489
Stoneridge Brazil [Member] | Civil, labor and other tax contingencies [Member]
Short-term Debt [Line Items]
Loss contingency, estimate of possible loss			$ 9,313		$ 9,313		$ 8,416	R$ 46583	R$ 43736
Stoneridge Brazil [Member] | Fine [Member]
Short-term Debt [Line Items]
Litigation amount	$ 1,598	R$ 7995

Commitments and Contingencies_3

Commitments and Contingencies (Reconciliation of Changes in Product Warranty and Recall Liability) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Commitments and Contingencies [Abstract]
Product warranty and recall at beginning of period	$ 12,691	$ 10,796
Accruals for warranties established during period	3,092	3,201
Aggregate changes in pre-existing liabilities due to claim developments	223	614
Settlements made during the period	(5,889)	(3,375)
Foreign currency translation	(169)	(173)
Product warranty and recall at end of period	$ 9,948	$ 11,063

Business Realignment and Rest_3

Business Realignment and Restructuring (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 21	$ 1,621	$ 220	$ 1,628
Additional restructuring costs	19		19
Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			1,654	2,552
Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	285	2,552	1,654	2,552
Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Estimated total cost	1,700		1,700
Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Estimated total cost	4,900		4,900
Canton Facility Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			13	2,683
Canton Facility Restructuring Plan [Member] | Control Devices [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0	461
Employee Termination [Member] | Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			50	863
Employee Termination [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			76
Employee Termination [Member] | Canton Facility Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense				1,119
Fixed Asset Impairment [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense				2,482
Other Restructuring [Member] | Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			170	313
Other Restructuring [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			1,393	70
Other Restructuring [Member] | Canton Facility Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			13	1,564
Contract Termination [Member] | Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense				452
Selling, General and Administrative Expenses [Member] | Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	19	1,244	174	1,251
Selling, General and Administrative Expenses [Member] | Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	35	2,388	673	2,388
Selling, General and Administrative Expenses [Member] | Canton Facility Restructuring Plan [Member] | Control Devices [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		235		549
Cost of Goods Sold [Member] | Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	5		3
Cost of Goods Sold [Member] | Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	250	164	900	164
Cost of Goods Sold [Member] | Canton Facility Restructuring Plan [Member] | Control Devices [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		80		1,570
Design and Development Expense [Member] | Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ (3)	377	43	377
Design and Development Expense [Member] | Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			81
Design and Development Expense [Member] | Canton Facility Restructuring Plan [Member] | Control Devices [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 146	$ 13	$ 564

Business Realignment and Rest_4

Business Realignment and Restructuring (Schedule of Restructuring and Related Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance				$ 0
Charge to expense			$ 1,654	2,552
Cash payments			(1,469)	(70)
Utilization, Non-Cash			(185)	(2,482)
Restructuring Reserve, Ending Balance		$ 0		0
Canton Facility Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			165	2,636
Charge to expense			13	2,683
Cash payments			(38)	(5,319)
Restructuring Reserve, Ending Balance	$ 140		140
Control Devices [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense	285	2,552	1,654	2,552
Control Devices [Member] | Canton Facility Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense	0	461
Control Devices [Member] | Cost of Goods Sold [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense	250	164	900	164
Control Devices [Member] | Cost of Goods Sold [Member] | Canton Facility Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense		80		1,570
Control Devices [Member] | Selling, General and Administrative Expenses [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense	35	2,388	673	2,388
Control Devices [Member] | Selling, General and Administrative Expenses [Member] | Canton Facility Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense		235		549
Control Devices [Member] | Design and Development Expense [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense			81
Control Devices [Member] | Design and Development Expense [Member] | Canton Facility Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense		146	13	564
Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			227	52
Charge to expense	21	1,621	220	1,628
Cash payments			(382)	(1,084)
Restructuring Reserve, Ending Balance	65	596	65	596
Electronics [Member] | Cost of Goods Sold [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense	5		3
Electronics [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense	19	1,244	174	1,251
Electronics [Member] | Design and Development Expense [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense	(3)	377	43	377
Employee Termination [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense			76
Cash payments			(76)
Employee Termination [Member] | Canton Facility Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			165	2,636
Charge to expense				1,119
Cash payments			(25)	(3,755)
Restructuring Reserve, Ending Balance	140		140
Employee Termination [Member] | Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			227	52
Charge to expense			50	863
Cash payments			(212)	(319)
Restructuring Reserve, Ending Balance	$ 65	596	65	596
Non-Cash Fixed Asset Charges [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense			185
Utilization, Non-Cash			(185)
Fixed Asset Impairment [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance				0
Charge to expense				2,482
Utilization, Non-Cash				(2,482)
Restructuring Reserve, Ending Balance		0		0
Contract Termination [Member] | Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance				0
Charge to expense				452
Cash payments				(452)
Utilization, Non-Cash				0
Restructuring Reserve, Ending Balance		0		0
Other Restructuring [Member] | Particulate Matter Product Line Strategic Exit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance				0
Charge to expense			1,393	70
Cash payments			(1,393)	(70)
Restructuring Reserve, Ending Balance		$ 0		0
Other Restructuring [Member] | Canton Facility Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense			13	1,564
Cash payments			(13)	(1,564)
Other Restructuring [Member] | Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Charge to expense			170	313
Cash payments			$ (170)	$ (313)

Business Realignment and Rest_5

Business Realignment and Restructurings Realignment Charges Classified by Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Total business realignment charges	$ 60	$ 2,583	$ 306	$ 3,187
Cost of Goods Sold [Member]
Restructuring Cost and Reserve [Line Items]
Total business realignment charges	7	926	7	1,012
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Total business realignment charges	52	1,180	264	1,698
Design and Development Expense [Member]
Restructuring Cost and Reserve [Line Items]
Total business realignment charges	1	477	35	477
Control Devices [Member]
Restructuring Cost and Reserve [Line Items]
Total business realignment charges		1,042	192	1,419
Control Devices [Member] | Cost of Goods Sold [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		603		603
Control Devices [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		190	192	567
Control Devices [Member] | Design and Development Expense [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		249		249
Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Total business realignment charges	1	1,305	13	1,305
Electronics [Member] | Cost of Goods Sold [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		323		323
Electronics [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		754		754
Severance benefit			(22)
Electronics [Member] | Design and Development Expense [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	1	228	35	228
Stoneridge Brazil [Member]
Restructuring Cost and Reserve [Line Items]
Total business realignment charges	59		59	153
Stoneridge Brazil [Member] | Cost of Goods Sold [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	7		7	86
Stoneridge Brazil [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 52		52	67
Unallocated Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Total business realignment charges		236	42	310
Unallocated Corporate [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		$ 236	$ 42	$ 310

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Taxes [Abstract]
Income tax expense (benefit) on operations	$ 5,794	$ (6,721)	$ 6,213	$ (5,508)
Effective income tax rate	22.60%	23.60%	23.80%	23.20%
Total operating income (loss)	$ 26,684	$ (26,823)	$ 28,743	$ (23,164)

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Details)	6 Months Ended
	Jun. 30, 2021segment
Segment Reporting [Abstract]
Number of reportable segments	3

Segment Reporting (Schedule of

Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Net Sales:
Net sales	$ 191,334	$ 99,545	$ 385,129	$ 282,511
Operating Income (Loss)
Total operating income (loss)	26,684	(26,823)	28,743	(23,164)
Total income before income taxes	25,592	(28,455)	26,141	(23,752)
Depreciation and Amortization:
Total depreciation and amortization	8,643	7,801	17,224	15,788
Interest Expense, net:
Total interest expense, net	1,860	1,410	3,626	2,440
Interest Expense, net:
Total interest expense, net	1,860	1,410	3,626	2,440
Capital Expenditures:
Capital expenditures	4,795	9,145	10,769	15,814
Long-Lived Assets	273,523		273,523		$ 286,744
Total Assets:
Total assets	635,932		635,932		621,408
Intersegment Eliminations [Member]
Net Sales:
Net sales	(7,603)	(3,601)	(15,562)	(13,216)
Total Assets:
Total assets	(327,332)		(327,332)		(329,140)
Control Devices [Member]
Net Sales:
Net sales	86,345	47,005	185,963	143,855
Operating Income (Loss)
Total operating income (loss)	37,065	(9,656)	47,230	(2,334)
Depreciation and Amortization:
Total depreciation and amortization	3,858	3,639	7,937	7,169
Interest Expense, net:
Total interest expense, net	108	89	240	170
Capital Expenditures:
Capital expenditures	3,380	3,349	4,741	5,663
Total Assets:
Total assets	195,853		195,853		194,433
Control Devices [Member] | Operating Segments [Member]
Net Sales:
Net sales	86,719	48,564	188,317	146,761
Control Devices [Member] | Inter-Segment Sales [Member]
Net Sales:
Net sales	374	1,559	2,354	2,906
Electronics [Member]
Net Sales:
Net sales	90,085	45,530	172,855	117,076
Operating Income (Loss)
Total operating income (loss)	(1,807)	(11,042)	(2,680)	(8,170)
Depreciation and Amortization:
Total depreciation and amortization	3,059	2,393	5,868	4,874
Interest Expense, net:
Total interest expense, net	164	313	295	400
Capital Expenditures:
Capital expenditures	461	5,410	3,911	8,060
Total Assets:
Total assets	316,941		316,941		303,914
Electronics [Member] | Operating Segments [Member]
Net Sales:
Net sales	97,314	47,572	186,063	127,386
Electronics [Member] | Inter-Segment Sales [Member]
Net Sales:
Net sales	7,229	2,042	13,208	10,310
Stoneridge Brazil [Member]
Net Sales:
Net sales	14,904	7,010	26,311	21,580
Operating Income (Loss)
Total operating income (loss)	(749)	(879)	(797)	(20)
Depreciation and Amortization:
Total depreciation and amortization	1,041	1,273	2,045	2,723
Interest Expense, net:
Total interest expense, net	(67)	(7)	(97)	3
Capital Expenditures:
Capital expenditures	757	281	1,419	1,414
Total Assets:
Total assets	63,643		63,643		61,350
Stoneridge Brazil [Member] | Operating Segments [Member]
Net Sales:
Net sales	14,904	7,010	26,311	21,580
Unallocated Corporate [Member]
Operating Income (Loss)
Total operating income (loss)	(7,825)	(5,246)	(15,010)	(12,640)
Depreciation and Amortization:
Total depreciation and amortization	685	496	1,374	1,022
Interest Expense, net:
Total interest expense, net	1,655	1,015	3,188	1,867
Capital Expenditures:
Capital expenditures	197	$ 105	698	$ 677
Total Assets:
Total assets	$ 386,827		$ 386,827		$ 390,851

Segment Reporting (Schedule o_2

Segment Reporting (Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 191,334	$ 99,545	$ 385,129	$ 282,511
Long-term Assets:
Total long-term assets	273,523		273,523		$ 286,744
North America [Member]
Segment Reporting Information [Line Items]
Net sales	96,700	43,122	193,234	142,973
Long-term Assets:
Total long-term assets	98,482		98,482		110,330
South America [Member]
Segment Reporting Information [Line Items]
Net sales	14,904	7,010	26,311	21,580
Long-term Assets:
Total long-term assets	34,505		34,505		33,785
Europe and Other [Member]
Segment Reporting Information [Line Items]
Net sales	79,730	$ 49,413	165,584	$ 117,958
Long-term Assets:
Total long-term assets	$ 140,536		$ 140,536		$ 142,629

Investments (Narrative) (Detail

Investments (Narrative) (Details) R$ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		64 Months Ended
	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	May 15, 2017	Dec. 31, 2020USD ($)	Dec. 31, 2020BRL (R$)	Dec. 31, 2018USD ($)	May 16, 2017
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 496	$ (231)	$ 1,110	$ 226
Fair value and other adjustments	14	$ (100)	198	$ (139)
Investment	$ 51,385		$ 51,385			$ 53,978
MSIL
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%	49.00%	49.00%	49.00%
Equity method investments	$ 14,414		$ 14,414			13,547
Income (loss) from equity method investments	$ 482	$ (231)	$ 912	$ 226
Stoneridge Brazil [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in consolidated subsidiary					74.00%
Percentage of additional noncontrolling interest acquired									26.00%
Stoneridge Brazil [Member] | Noncontrolling interest
Schedule of Equity Method Investments [Line Items]
Dividends payable						6,010	R$ 24154
Autotech Ventures [Member] | Venture Capital Funds [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	6.60%		6.60%
Investment commitment						10,000		$ 10,000
Investment	$ 5,233		$ 5,233			$ 3,436
Contribution expected period (in years)			10 years
Contribution			$ 1,850	$ 750
Proceeds from other investments			$ 251

Disposals (Narrative) (Details)

Disposals (Narrative) (Details) - USD ($) $ in Thousands	Jun. 17, 2021	Mar. 08, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	May 07, 2021
Selling, general and administrative			$ 31,380		$ 27,693	$ 60,756	$ 57,196
Gain on disposal			30,718			$ 30,718
Particulate Matter Sensor Assets [Member]
Agreement date						Mar. 8, 2021
Disposal group, net sales			2,292		1,382	$ 6,307	3,763
Disposal group, operating income			416		$ (114)	867	$ (70)
Purchase price for sale of assets		$ 4,000,000
Post-closing inventory adjustment payment		1,133
Particulate Matter Sensor Assets [Member] | SMP [Member]
Services provided income per agreement recognized as reduction to selling general and administrative expenses			261			330
Disposal group, net sales			$ 2,292			3,070
Particulate Matter Sensor Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Selling, general and administrative				$ 60
Particulate Matter Sensor Gen 1 Assets [Member]
Purchase price for sale of assets		3,214
Particulate Matter Sensor Gen 1 Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | SMP [Member]
Disposal group, net sales						$ 971
Particulate Matter Sensor Gen 2 Assets [Member]
Purchase price for sale of assets		$ 786
Canton Facility [Member]
Agreement date						May 7, 2021
Proceeds from sale of productive assets	$ 35,167
Gain on disposal	30,718
Purchase price for sale of assets	$ 37,900							$ 38,200
Control Devices [Member] | Particulate Matter Sensor Gen 1 Assets [Member]
Disposal group, net sales				971
Disposal group, cost of goods sold				898
Gain on disposal				$ 740