8-K

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 09, 2023

SIENTRA, INC.

(Exact name of Registrant as Specified in Its Charter)

Delaware	001-36709	20-5551000
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)
3333 Michelson Drive, Suite 650
Irvine, California		92612
(Address of Principal Executive Offices)		(Zip Code)

Registrant’s Telephone Number, Including Area Code: 805 562-3500

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.01 per share	SIEN	The Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition.

On November 9, 2023, Sientra, Inc. (the “Company”) issued a press release announcing its financial condition and results of operations for the period ended September 30, 2023. A copy of the press release is furnished as Exhibit 99.1 and is incorporated herein by reference.

The information under Item 2.02 of this Current Report on Form 8-K, including the press release furnished as Exhibit 99.1, is being furnished, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference into any of the Company’s filings, whether made before or after the date hereof, regardless of any general incorporation language in any such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.	Description
99.1	Earnings Press Release of Sientra, Inc. dated November 9, 2023.
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

			SIENTRA, INC.
Date:	November 9, 2023	By:	/s/ Ronald Menezes
			Ronald Menezes President and Chief Executive Officer

EX-99.1

Exhibit 99.1

 

Sientra Reports THIRD Quarter FINANCIAL and operational Results

IRVINE, Calif., November 9, 2023 (GLOBE NEWSWIRE) -- Sientra, Inc. (NASDAQ: SIEN) (“Sientra” or the “Company”), a surgical aesthetics company developing the safest and most innovative solutions for the best aesthetic outcomes, today announced its financial results for the third quarter that ended September 30, 2023.

Third Quarter2023 Financial and Business Highlights

•Net sales of $19.5 million representing a decrease of 13.7% over the third quarter of 2022. For the first nine months of 2023, net sales totaled $65.2 million, approximately flat from $65.5 million for the same period in 2022.

•Free cash flow usage of $3.6 million, a slight improvement from $3.7 million in the same period in 2022. For the first nine months of 2023, free cash flow usage totaled $11.2 million, a 68.3% improvement versus free cash usage of $35.3 million for the same period in 2022.

•Adjusted EBITDA loss of $6.4 million, a 25.6% improvement from a $8.6 million loss for the same period in 2022. For the first nine months of 2023, adjusted EBITDA loss totaled $15.4 million, a 47.4% improvement versus a $29.3 million loss for the same period in 2022.

•Presented at the American Society of Plastic Surgeons meeting in Austin, Texas, unparalleled 12-month interim clinical data for the Viality™ fat transfer system demonstrating over 80% fat retention at all time points.

•Obtained approval for Viality from Health Canada, representing the first international expansion for the Company’s novel fat transfer technology.

Ron Menezes, Sientra’s President and Chief Executive Officer, said, "As reported in our October 30 pre-release, Q3 revenues were negatively impacted by more pronounced seasonality resulting in softer procedural volumes as compared to prior periods. We remain enthusiastic on the potential of our portfolio, which we believe is unmatched in the industry. With the early controlled launches of Viality and Simpliderm® starting to take effect, and the upcoming launch of Allox2 PRO™, which is the first and only dual port, MRI-compatible tissue expander, we believe 2024 will be an inflection point for the Company, driven by both top-line growth and profitability."

“We are extremely excited about the interim 12-month clinical data on our Viality long-term retention study presented at Plastic Surgery: The Meeting” commented Dr. Denise Dajles, Sientra’s Chief Technology Officer. “This first-of-its-kind study, has demonstrated unparalleled fat retention of over 80% at the 3-, 6- and now 12-month time points. This retention rate is also consistent across cohorts, showing predictable, high retention rates for augmentation and reconstruction patients, including patients using fat with implants or just fat alone. This is highly significant, as it represents the first truly minimally invasive option for patients who want to add volume without an implant, providing an important new tool for plastic surgeons in their patient care.”

Third Quarter 2023 Financial Results

•Total net sales were $19.5 million, a decrease of 13.7% compared to total net sales of $22.6 million for the same period in 2022.

•GAAP gross profit for the third quarter of 2023 was $10.0 million, or 51.3% of sales, compared to gross profit of $12.8 million, or 56.6% of sales, for the same period in 2022. This quarter’s results were negatively affected by a non-cash depreciation and amortization charge of $1.4 million. This charge is primarily due to the inclusion of non-cash amortization of Viality manufacturing know-how and developed technology in cost of sales. Non-GAAP gross margin, excluding this non-cash

depreciation and amortization charge, was 58.4% of sales for the current period as compared to 57.9% for the prior year period.

•Total GAAP loss from continuing operations for the third quarter of 2023 was $14.8 million, compared to $14.9 million for the same period in 2022, a 0.7% improvement from the prior year period.

•Total GAAP operating expense for the third quarter of 2023 was $19.4 million, compared to $25.3 million for the prior year period, a decrease of $5.9 million or 23.3%.

•Non-GAAP total operating expenses for the third quarter of 2023 were $17.8 million, compared to $21.7 million for the same period in 2022, an 18.0% reduction from the prior year period.

•On a non-GAAP basis, adjusted EBITDA for the third quarter of 2023 was a $6.4 million loss, a 25.6% improvement from a loss of $8.6 million for the same period in 2022.

•Net cash and cash equivalents as of September 30, 2023, were $15 million, compared to $26.1 million on December 31, 2022, and $18.6 million on June 30, 2023.

Conference Call

Sientra will hold a conference call today, November 9, 2023, at 4:30 pm ET to discuss third quarter 2023 results. The dial-in numbers are (844) 735-3763 for domestic callers and (412) 317-5711 for international callers. The webcast link is the following: Sientra Q3 2023 Earnings Call Webcast Registration Link. A live conference call webcast will be available on the Investor Relations section of the Company's website at www.sientra.com. The webcast will be archived on the website following the call’s completion.

Use of Non-GAAP Financial Measures

Sientra has supplemented its U.S. GAAP net income (loss) with a non-GAAP measure of adjusted EBITDA, U.S. GAAP gross profit and gross margin with a non-GAAP measure of adjusted gross profit and gross margin, U.S. GAAP operating expenses with a non-GAAP measure of non-GAAP operating expenses, and U.S. GAAP cash flow from operating activities with a non-GAAP measure of free cash flow. Management believes that these non-GAAP financial measures provide useful supplemental information to management and investors regarding the performance of the Company, facilitate a more meaningful comparison of results for current periods with previous operating results, and assist management in analyzing future trends, making strategic and business decisions and establishing internal budgets and forecasts. Reconciliations of non-GAAP adjusted EBITDA, non-GAAP adjusted gross profit and gross margin, non-GAAP operating expenses, and free cash flow to U.S. GAAP net income (loss), U.S. GAAP operating expenses and U.S. GAAP cash flow from operating activities, the most directly comparable U.S. GAAP measures, are provided in the schedules below. There are limitations in using these non-GAAP financial measures because they are not prepared in accordance with U.S. GAAP and may be different from non-GAAP financial measures used by other companies. These non-GAAP financial measures should not be considered in isolation or as a substitute for U.S. GAAP financial measures. Investors and potential investors should consider non-GAAP financial measures only in conjunction with Sientra’s financial statements prepared in accordance with U.S. GAAP and the reconciliations of the non-GAAP financial measures provided in the schedules below.

About Sientra

Headquartered in Irvine, California, Sientra is a surgical aesthetics company focused on empowering people to change their lives through increased self-confidence and self-respect. Backed by unrivaled clinical and safety data, Sientra’s platform of products includes a comprehensive portfolio of round and shaped breast implants, the first fifth-generation breast implants approved by the FDA for sale in the United States, the ground-breaking AlloX2®breast tissue expander with patented dual-port and integral drain technology, the

next-generation AlloX2Pro™, the first and only FDA-cleared MRI-compatible tissue expander, the Viality™ with AuraClens™ enhanced viability fat transfer system, the SimpliDerm® Human Acellular Dermal Matrix, and BIOCORNEUM the #1 performing, preferred and recommended scar gel of plastic surgeons (*).

Sientra uses its investor relations website to publish important information about the Company, including information that may be deemed material to investors. Financial and other information about Sientra is routinely posted and is accessible on the Company’s investor relations website at www.sientra.com.

To learn more about Sientra, visit our website and follow Sientra on LinkedIn, Instagram, and Facebook.

(*) Data on file

Forward-Looking Statements

This press release contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, based on management’s current assumptions and expectations of future events and trends, which affect or may affect the Company’s business, strategy, operations or financial performance, and actual results may differ materially from those expressed or implied in such statements due to numerous risks and uncertainties. Forward-looking statements are made only as of the date of this release. The words ‘‘believe,’’ ‘‘may,’’ ‘‘might,’’ ‘‘could,’’ ‘‘will,’’ ‘‘aim,’’ ‘‘estimate,’’ ‘‘continue, ‘‘anticipate,’’ ‘‘intend,’’ ‘‘expect,’’ ‘‘plan,’’ ‘‘position,” or the negative of those terms, and similar expressions that convey uncertainty of future events or outcomes are intended to identify estimates, projections and other forward-looking statements. Forward-looking statements may include information concerning the Company’s unaudited financial information for the third quarter ended September 30, 2023, the Company’s possible or assumed future results of operations, including descriptions of the Company’s revenues, operating expense, profitability, outlook and overall business strategy, the Company’s ability and timing to successfully integrate the Viality™ with AuraClens™ fat transfer system and SimpliDerm® human Acellular Dermal Matrix into its existing operations, the reception of plastic surgeons to the Company’s products, the Company’s ability to expand into aesthetic applications outside of breast procedures, the Company’s ability to add additional products and strategic partnerships, and the Company’s ability to capture additional market share and customer accounts in the plastic surgery market. Such statements are subject to risks and uncertainties, including the audit of the Company’s financial statements which audit is not yet complete and the numbers presented here could differ from the final audited financial statements presented by the Company, the Company’s ability to recapture delayed procedures resulting from the COVID-19 pandemic, the positive reaction from plastic surgeons and their patients to the Company’s products, the ability to meet consumer demand including any potential supply issues resulting from the COVID-19 pandemic or the war in Ukraine, the growth of the plastic surgery market and breast procedures, the ability of the Company to execute on its commercial, operational, marketing, research and development and regulatory plans, and the Company’s ability to comply with the terms of the Facility Agreement, including financial covenants, both during and after any waiver period, and/or obtain any additional waivers of any terms of the Company’s Facility Agreement to the extent required. Additional factors that could cause actual results to differ materially from those contemplated in this press release can be found in the Risk Factors section of Sientra’s public filings with the Securities and Exchange Commission. All statements other than statements of historical fact are forward-looking statements. The words ‘‘believe,’’ ‘‘may,’’ ‘‘might,’’ ‘‘could,’’ ‘‘will,’’ ‘‘aim,’’ ‘‘estimate,’’ ‘‘continue, ‘‘anticipate,’’ ‘‘intend,’’ ‘‘expect,’’ ‘‘plan,’’ ‘‘position,” or the negative of those terms, and similar expressions that convey uncertainty of future events or outcomes are intended to identify estimates, projections and other forward-looking statements. You are cautioned not to place undue reliance on these forward-looking statements, and such estimates, projections and other forward-looking statements speak only as of the date they were made, and, except to the extent required by law, the Company undertakes no obligation to update or review any estimate, projection or forward-looking statement. Actual results may differ from those set forth in this press release due to the risks and uncertainties inherent in the Company’s business.

Investor Relations Contact

Aman R. Patel, CFA

aman.patel@westwicke.com

Sientra, Inc.
Condensed Consolidated Statements of Operations
(In thousands, except per share and share amounts)
(Unaudited)
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
Net sales	$	19,544		$	22,570		$	65,231		$	65,481
Cost of goods sold		9,515			9,794			30,440			27,118
Gross profit		10,029			12,776			34,791			38,363
Operating expenses:
Sales and marketing		9,330			12,290			29,487			41,542
Research and development		2,476			3,720			7,571			9,823
General and administrative		7,620			9,324			24,805			31,589
Total operating expenses		19,426			25,334			61,863			82,954
Loss from operations		(9,397	)		(12,558	)		(27,072	)		(44,591	)
Other (expense) income, net:
Interest income		168			41			458			58
Interest expense		(2,367	)		(2,364	)		(7,250	)		(6,584	)
Change in fair value of derivative liability		(3,153	)		—			(3,153	)		—
Other (expense) income, net		(24	)		(6	)		(125	)		(1	)
Total other (expense) income, net		(5,376	)		(2,329	)		(10,070	)		(6,527	)
Loss from continuing operations before income taxes		(14,773	)		(14,887	)		(37,142	)		(51,118	)
Loss from continuing operations		(14,773	)		(14,887	)		(37,142	)		(51,118	)
Loss from discontinued operations, net of income taxes		—			(94	)		—			(208	)
Net loss	$	(14,773	)	$	(14,981	)	$	(37,142	)	$	(51,326	)
Basic and diluted net loss per share attributable to    common stockholders
Continuing operations	$	(1.31	)	$	(2.37	)	$	(3.23	)	$	(8.16	)
Discontinued operations		—			(0.01	)		—			(0.03	)
Basic and diluted net loss per share	$	(1.31	)	$	(2.38	)	$	(3.23	)	$	(8.19	)
Weighted average outstanding common shares used for net loss per share attributable to common stockholders:
Basic and diluted		11,290,699			6,284,817			11,488,310			6,261,350

Sientra, Inc.
Condensed Consolidated Balance Sheets
(In thousands)
(Unaudited)
	September 30,			December 31,
	2023			2022
Assets
Current assets:
Cash and cash equivalents	$	15,026		$	26,071
Accounts receivable, net		29,610			36,892
Inventories		39,268			42,692
Prepaid expenses and other current assets		2,604			2,094
Total current assets		86,508			107,749
Property and equipment, net		13,289			14,941
Goodwill		9,202			9,202
Other intangible assets, net		24,332			25,676
Right of use assets, net		5,753			7,004
Other assets		849			849
Total assets	$	139,933		$	165,421
Liabilities and Stockholders’ Deficit
Current liabilities:
Current portion of long-term debt	$	58,810		$	-
Accounts payable		5,284			6,818
Accrued and other current liabilities		20,655			22,599
Customer deposits		53,598			45,161
Sales return liability		13,745			15,773
Total current liabilities		152,092			90,351
Long-term debt		—			55,406
Derivative liability		3,153			880
Deferred and contingent consideration		1,794			2,791
Warranty reserve		8,758			8,186
Lease liabilities		4,129			5,518
Other liabilities		2,052			2,698
Total liabilities		171,978			165,830
Stockholders’ deficit:
Total stockholders’ deficit		(32,045	)		(409	)
Total liabilities and stockholders’ deficit	$	139,933		$	165,421

Sientra, Inc.
Condensed Consolidated Statements of Cash Flows
(In thousands)
(Unaudited)
	Nine Months Ended September 30,
	2023			2022
Cash flows from operating activities:
Net loss	$	(37,142	)	$	(51,326	)
Loss from discontinued operations, net of income taxes		—			(208	)
Loss from continuing operations, net of income taxes		(37,142	)		(51,118	)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		5,546			4,947
Provision for doubtful accounts		448			1,086
Provision for warranties		1,510			583
Provision for inventories		68			607
Fair value adjustments to derivative liability		3,153			—
Fair value adjustments of other liabilities held at fair value		350			(88	)
Amortization of debt discount and issuance costs		3,621			3,029
Employee stock-based compensation expense		4,293			6,113
Other non-cash adjustments		—			135
Changes in operating assets and liabilities:
Accounts receivable		6,610			(2,341	)
Inventories		3,357			667
Prepaid expenses, other current assets and other assets		741			1,997
Accounts payable, accrued and other liabilities		(9,122	)		(5,514	)
Customer deposits		8,437			7,830
Sales return liability		(2,029	)		(1,383	)
Net cash flow used in operating activities - continuing operations		(10,159	)		(33,450	)
Net cash flow used in operating activities - discontinued operations		—			(208	)
Net cash used in operating activities		(10,159	)		(33,658	)
Cash flows from investing activities:
Purchases of property and equipment		(1,056	)		(1,856	)
Net cash flow used in investing activities - continuing operations		(1,056	)		(1,856	)
Net cash used in investing activities		(1,056	)		(1,856	)
Cash flows from financing activities:
Proceeds from issuance of common stock for employee stock-based plans		428			475
Shares repurchased for tax withholding on vesting RSUs		(96	)		(448	)
Gross borrowings under the Term Loan		—			5,000
Gross borrowings under the Revolving Loan		—			5,440
Repayments of the Revolving Loan		—			(7,678	)
Deferred financing costs		(162	)		(73	)
Net cash provided by financing activities - continuing operations		170			2,716
Net cash provided by financing activities		170			2,716
Net decrease in cash, cash equivalents and restricted cash		(11,045	)		(32,798	)
Cash, cash equivalents and restricted cash at:
Beginning of period		26,677			52,068
End of period	$	15,632		$	19,270
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents		15,026			18,975
Restricted cash included in other assets		606			295
Total cash, cash equivalents and restricted cash	$	15,632		$	19,270

Sientra, Inc.
Reconciliation of US GAAP Loss from Continuing Operations to Non-GAAP Adjusted EBITDA
(In thousands)
(Unaudited)
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
Loss from continuing operations, as reported	$	(14,773	)	$	(14,887	)	$	(37,142	)	$	(51,118	)
Adjustments to loss from continuing operations:
Interest (income) expense and other, net		2,223			2,329			6,917			6,528
Depreciation and amortization		1,887			1,545			5,546			4,947
Fair value adjustments to contingent consideration		—			—			90			(88	)
Fair value adjustments to derivative liability		3,153			—			3,153			—
Stock-based compensation		1,233			1,855			4,293			6,113
Provision for doubtful accounts		(86	)		582			448			1,086
Severance		280			—			598			1,635
SEC/DOJ related legal fees		—			—			1,016			—
Legal settlement expense		(265	)		—			(265	)		1,600
Total adjustments to loss from continuing operations		8,425			6,311			21,796			21,821
Adjusted EBITDA	$	(6,348	)	$	(8,576	)	$	(15,346	)	$	(29,297	)
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
As a Percentage of Revenue**	2023			2022			2023			2022
Loss from continuing operations, as reported		(75.6	%)		(66.0	%)		(56.9	%)		(78.1	%)
Adjustments to loss from continuing operations:
Interest (income) expense and other, net		11.4	%		10.3	%		10.6	%		10.0	%
Depreciation and amortization		9.7	%		6.8	%		8.5	%		7.6	%
Fair value adjustments to contingent consideration		0.0	%		0.0	%		0.1	%		(0.1	%)
Fair value adjustments to derivative liability		16.1	%		0.0	%		4.8	%		0.0	%
(Loss) gain on extinguishment of debt		0.0	%		0.0	%		0.0	%		0.0	%
Stock-based compensation		6.3	%		8.2	%		6.6	%		9.3	%
Provision for doubtful accounts		(0.4	%)		2.6	%		0.7	%		1.7	%
Severance		1.4	%		0.0	%		0.9	%		2.5	%
SEC/DOJ related legal fees		0.0	%		0.0	%		1.6	%		0.0	%
Legal settlement expense		(1.4	%)		0.0	%		(0.4	%)		2.4	%
Total adjustments to loss from continuing operations		43.1	%		28.0	%		33.4	%		33.3	%
Adjusted EBITDA		(32.5	%)		(38.0	%)		(23.5	%)		(44.7	%)
** Adjustments may not add to the total figure due to rounding.

Sientra, Inc.
Reconciliation of US GAAP Gross Profit to Adjusted Gross Profit and Adjusted Gross Margin
(In thousands)
(Unaudited)
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
Net sales	$	19,544		$	22,570		$	65,231		$	65,481
Cost of goods sold		9,515			9,794			30,440			27,118
Gross profit	$	10,029		$	12,776		$	34,791		$	38,363
Gross margin		51.3	%		56.6	%		53.3	%		58.6	%
Adjustments to gross profit
Depreciation and amortization		1,386			301			4,087			1,132
Total adjustments to gross profit		1,386			301			4,087			1,132
Adjusted gross profit	$	11,415		$	13,077		$	38,878		$	39,495
Adjusted gross margin		58.4	%		57.9	%		59.6	%		60.3	%

Sientra, Inc.
Reconciliation of US GAAP Operating Expenses to Non-GAAP Operating Expenses
(In thousands)
(Unaudited)
	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2023			2022		2023			2022
US GAAP operating expenses, as reported	$	19,426		$	25,334	$	61,863		$	82,954
Adjustments to GAAP operating expenses:
Depreciation and amortization		501			1,244		1,459			3,815
Fair value adjustments to contingent consideration		—			—		90			(88	)
Stock-based compensation		1,233			1,855		4,293			6,113
Provision for doubtful accounts		(86	)		582		448			1,086
Severance		280			—		598			1,635
SEC/DOJ related legal fees		—			—		1,016			—
Legal settlement expense		(265	)		—		(265	)		1,600
Total adjustments to GAAP operating expenses		1,663			3,681		7,639			14,161
Non-GAAP operating expenses		17,763			21,653		54,224			68,793

Sientra, Inc.
Reconciliation of US GAAP Operating Expenses to Non-GAAP Operating Expenses
(In thousands)
(Unaudited)
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
US GAAP operating expenses, as reported
Sales and marketing	$	9,330		$	12,290		$	29,487		$	41,542
Research and development		2,476			3,720			7,571			9,823
General and administrative		7,620			9,324			24,805			31,589
Total GAAP operating expenses, as reported	$	19,426		$	25,334		$	61,863		$	82,954
Adjustments to GAAP operating expenses:
Sales and marketing		425			640			1,332			3,065
Research and development		205			173			528			575
General and administrative		1,033			2,868			5,779			10,521
Total adjustments to GAAP operating expenses		1,663			3,681			7,639			14,161
Non-GAAP operating expenses
Sales and marketing		8,905			11,650			28,155			38,477
Research and development		2,271			3,547			7,043			9,248
General and administrative		6,587			6,456			19,026			21,068
Total Non-GAAP operating expenses	$	17,763		$	21,653		$	54,224		$	68,793
Sientra, Inc.
Free Cash Flow
(In thousands)
(Unaudited)
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
Net cash flow used in operating activities - continuing operations	$	(3,367	)	$	(2,605	)	$	(10,159	)	$	(33,450	)
Purchases of property and equipment		(270	)		(1,043	)		(1,056	)		(1,856	)
Free cash flow	$	(3,637	)	$	(3,648	)	$	(11,216	)	$	(35,306	)

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Document And Entity Information	Nov. 09, 2023
Cover [Abstract]
Document Type	8-K
Amendment Flag	false
Document Period End Date	Nov. 09, 2023
Entity Registrant Name	SIENTRA, INC.
Entity Central Index Key	0001551693
Entity Emerging Growth Company	false
Securities Act File Number	001-36709
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-5551000
Entity Address, Address Line One	3333 Michelson Drive, Suite 650
Entity Address, City or Town	Irvine
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92612
City Area Code	805
Local Phone Number	562-3500
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	SIEN
Security Exchange Name	NASDAQ