Impinj (PI) 10-Q 29 Jul 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	6 Months Ended
	Jun. 30, 2019shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Registrant Name	IMPINJ INC
Entity Central Index Key	0001114995
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding	21,761,423
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Trading Symbol	PI
Entity Address, State or Province	Washington
Entity File Number	001-37824
Entity Tax Identification Number	912041398
Entity Address, Address Line One	400 Fairview Avenue North
Entity Address, Address Line Two	Suite 1200
Entity Address, City or Town	Seattle
Entity Address, Postal Zip Code	98109
City Area Code	206
Local Phone Number	517-5300

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 22,153	$ 17,530
Short-term investments	37,645	38,543
Accounts receivable, net	21,260	18,462
Inventory	37,910	44,725
Prepaid expenses and other current assets	1,524	1,954
Total current assets	120,492	121,214
Property and equipment, net	17,759	19,778
Operating lease right-of-use assets	17,786
Other non-current assets	237	196
Goodwill	3,881	3,881
Total assets	160,155	145,069
Current liabilities:
Accounts payable	5,407	4,643
Accrued compensation and employee related benefits	5,938	7,409
Accrued liabilities	2,982	2,887
Current portion of operating lease liabilities	3,207
Current portion of restructuring liabilities	94	582
Current portion of long-term debt	1,241	5,930
Current portion of finance lease liabilities	419	523
Current portion of deferred rent		402
Current portion of deferred revenue	964	649
Total current liabilities	20,252	23,025
Long-term debt, net of current portion	22,126	17,633
Operating lease liabilities, net of current portion	20,628
Finance lease liabilities, net of current portion	79	258
Long-term liabilities — other	301	304
Long-term restructuring liabilities		487
Deferred rent, net of current portion		5,294
Deferred revenue, net of current portion	137	185
Total liabilities	63,523	47,186
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, $0.001 par value — 5,000 shares authorized, no shares issued and outstanding at June 30, 2019 and December 31, 2018
Common stock, $0.001 par value — 495,000 shares authorized, 21,761 and 21,492 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	22	21
Additional paid-in capital	347,558	337,627
Accumulated other comprehensive income (loss)	34	(9)
Accumulated deficit	(250,982)	(239,756)
Total stockholders' equity	96,632	97,883
Total liabilities and stockholders' equity	$ 160,155	$ 145,069

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	495,000,000	495,000,000
Common stock, shares issued	21,761,000	21,492,000
Common stock, shares outstanding	21,761,000	21,492,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 38,190	$ 28,542	$ 71,253	$ 53,610
Cost of revenue	19,774	14,882	36,964	28,188
Gross profit	18,416	13,660	34,289	25,422
Operating expenses:
Research and development	8,773	8,363	17,334	16,366
Sales and marketing	8,188	8,023	16,737	16,882
General and administrative	5,455	5,061	11,150	10,286
Restructuring costs (benefits)		(178)		3,749
Total operating expenses	22,416	21,269	45,221	47,283
Loss from operations	(4,000)	(7,609)	(10,932)	(21,861)
Other income, net	309	267	630	357
Interest expense	(421)	(351)	(850)	(580)
Loss before income taxes	(4,112)	(7,693)	(11,152)	(22,084)
Income tax expense	(46)	(39)	(74)	(90)
Net loss	$ (4,158)	$ (7,732)	$ (11,226)	$ (22,174)
Net loss per share — basic and diluted	$ (0.19)	$ (0.36)	$ (0.52)	$ (1.04)
Weighted-average shares outstanding — basic and diluted	21,709	21,333	21,626	21,229

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (4,158)	$ (7,732)	$ (11,226)	$ (22,174)
Other comprehensive income, net of tax:
Unrealized gain on investments	27	20	43
Total other comprehensive income	27	20	43
Comprehensive loss	$ (4,131)	$ (7,712)	$ (11,183)	$ (22,174)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net loss	$ (11,226)	$ (22,174)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	2,417	2,258
Stock-based compensation	7,020	4,678
Non-cash restructuring benefit		(454)
Accretion of discount or amortization of premium on short-term investments	(362)	(143)
Amortization of debt issuance costs	35	39
Changes in operating assets and liabilities:
Accounts receivable	(2,798)	2,228
Inventory	6,815	(6,195)
Prepaid expenses and other assets	467	864
Deferred revenue	267	(487)
Deferred rent		(87)
Accounts payable	798	579
Accrued compensation and employee related benefits	(1,429)	341
Operating lease right-of-use assets	868
Operating lease liabilities	(1,490)
Accrued liabilities and other liabilities	459	(34)
Restructuring liabilities		2,275
Net cash provided by (used in) operating activities	1,841	(16,312)
Investing activities:
Purchases of investments	(36,569)	(19,154)
Proceeds from maturities of investments	37,794	20,800
Purchases of property and equipment	(799)	(1,071)
Net cash provided by investing activities	426	575
Financing activities:
Principal payments on finance lease obligations	(283)	(483)
Payments on term and equipment loans	(4,222)	(2,147)
Proceeds from term loans, net of debt issuance costs	3,991	12,379
Proceeds from exercise of stock options and employee stock purchase plan	2,870	2,203
Net cash provided by financing activities	2,356	11,952
Net increase (decrease) in cash and cash equivalents	4,623	(3,785)
Cash and cash equivalents
Beginning of period	17,530	19,285
End of period	22,153	15,500
Supplemental disclosure of non-cash financing and investing activities:
Purchases of property and equipment not yet paid	$ 112	$ 93

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In-Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2017	$ 118,942	$ 21	$ 323,482	$ (204,525)	$ (36)
Beginning balance, shares at Dec. 31, 2017		20,973
Issuance of common stock	2,015		2,015
Issuance of common stock, shares		359
Stock-based compensation	2,065		2,065
Net loss	(14,442)			(14,442)
Other comprehensive income (loss)	(20)				(20)
Ending balance at Mar. 31, 2018	108,560	$ 21	327,562	(218,967)	(56)
Ending balance, shares at Mar. 31, 2018		21,332
Beginning balance at Dec. 31, 2017	118,942	$ 21	323,482	(204,525)	(36)
Beginning balance, shares at Dec. 31, 2017		20,973
Net loss	(22,174)
Ending balance at Jun. 30, 2018	103,727	$ 21	330,441	(226,699)	(36)
Ending balance, shares at Jun. 30, 2018		21,395
Beginning balance at Mar. 31, 2018	108,560	$ 21	327,562	(218,967)	(56)
Beginning balance, shares at Mar. 31, 2018		21,332
Issuance of common stock	266		266
Issuance of common stock, shares		63
Stock-based compensation	2,613		2,613
Net loss	(7,732)			(7,732)
Other comprehensive income (loss)	20				20
Ending balance at Jun. 30, 2018	103,727	$ 21	330,441	(226,699)	(36)
Ending balance, shares at Jun. 30, 2018		21,395
Beginning balance at Dec. 31, 2018	97,883	$ 21	337,627	(239,756)	(9)
Beginning balance, shares at Dec. 31, 2018		21,492
Issuance of common stock	1,863	$ 1	1,862
Issuance of common stock, shares		135
Stock-based compensation	3,477		3,477
Net loss	(7,068)			(7,068)
Other comprehensive income (loss)	16				16
Ending balance at Mar. 31, 2019	96,171	$ 22	342,966	(246,824)	7
Ending balance, shares at Mar. 31, 2019		21,627
Beginning balance at Dec. 31, 2018	97,883	$ 21	337,627	(239,756)	(9)
Beginning balance, shares at Dec. 31, 2018		21,492
Net loss	(11,226)
Other comprehensive income (loss)	43
Ending balance at Jun. 30, 2019	96,632	$ 22	347,558	(250,982)	34
Ending balance, shares at Jun. 30, 2019		21,761
Beginning balance at Mar. 31, 2019	96,171	$ 22	342,966	(246,824)	7
Beginning balance, shares at Mar. 31, 2019		21,627
Issuance of common stock	1,049		1,049
Issuance of common stock, shares		134
Stock-based compensation	3,543		3,543
Net loss	(4,158)			(4,158)
Other comprehensive income (loss)	27				27
Ending balance at Jun. 30, 2019	$ 96,632	$ 22	$ 347,558	$ (250,982)	$ 34
Ending balance, shares at Jun. 30, 2019		21,761

Description of Business

Description of Business	6 Months Ended
	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business	Note 1. Description of Business Impinj, Inc. ("we", "us" or "our"), a Delaware corporation, is headquartered in Seattle, Washington. We enable wireless connectivity for everyday items, delivering each item’s unique identity, location and authenticity to business and consumer applications. Our platform spans endpoints, connectivity and software and provides wireless item connectivity and information delivery. We derive revenue from selling endpoint integrated circuits, or ICs, reader ICs, modules, readers, gateways and software as well as from development, service and license agreements. Our integrated platform connects billions of everyday items to applications, delivering real-time information to businesses about items they create, manage, transport and sell.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2. Summary of Significant Accounting Policies Basis of Presentation The accompanying condensed consolidated financial statements include Impinj, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. These condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, or GAAP, and applicable rules and regulations of the Securities and Exchange Commission, or SEC, regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes as of and for the year ended December 31, 2018 included in Impinj, Inc.’s Annual Report on Form 10-K, which was filed with the SEC on February 28, 2019. The condensed consolidated balance sheet as of December 31, 2018, included herein, was derived from the audited consolidated financial statements of Impinj, Inc. The unaudited condensed consolidated interim financial statements, in the opinion of management, reflect all adjustments, consisting of normal recurring adjustments, necessary to state fairly our financial position, results of operations, and our cash flows for the periods presented. Interim results are not necessarily indicative of the results for a full year or for any other future period. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the periods presented. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, reserve for sales returns and incentives, inventory excess and obsolescence, recoverability of long-lived assets Leases We determine whether an arrangement is or contains a lease at inception. Right-of-use, or ROU, assets represent our right to use an identified asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. We use our incremental borrowing rate in determining the present value of lease payments as our operating leases do not provide an implicit rate. Our incremental borrowing rate is based on a credit-adjusted risk-free rate, which best approximates a secured rate over a similar term of lease. Lease expense for lease payments is recognized on a straight-line basis over the lease term. Finance lease ROU assets are included in property and equipment, net in our condensed consolidated balance sheets. We have various non-cancellable operating lease agreements for office, warehouse and research and development space in the U.S., China, Thailand and Malaysia, with expiration dates from 2019 to 2026. Certain of these arrangements have free or escalating rent payment provisions and optional renewal and termination clauses that are factored into our determination of lease payments when appropriate. These lease agreements typically include lease and non-lease components and are generally accounted as a single lease component. Leases with an initial term of 12 months or less are not recorded on our balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. Recently Adopted Accounting Standards In February 2016, the Financial Accounting Standards Board, or FASB, issued guidance on leases. This standard requires the recognition of a right-of-use asset and lease liability on the balance sheet for all leases. It also requires more detailed disclosures to enable users of financial statements to understand the amount, timing, and uncertainty of cash flows arising from leases. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. We adopted this standard on January 1, 2019 using the effective date modified retrospective transition method and elected the available practical expedients permitted under the transition method, allowing us to carryforward our historical assessments of (1) whether contracts are or contain leases, (2) lease classification, and (3) initial direct costs. As a result of the adoption of this standard, we recorded net operating lease ROU assets and lease liabilities In June 2018, the FASB issued guidance to improve nonemployee share-based payment accounting that requires companies to account for share-based payments granted to nonemployees similar to share-based payments granted to employees. This guidance is effective for fiscal years beginning after December 15, 2018, including the interim periods within those fiscal years. We adopted this standard on January 1, 2019 and the adoption of this guidance In August 2018, the FASB issued guidance to align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This guidance is effective for fiscal years beginning after December 15, 2019, including the interim periods within those fiscal years. Early adoption of this guidance is permitted. We early adopted this guidance prospectively on January 1, 2019 and the adoption of this guidance did not impact our financial positions, results of operations or cash flows. Recently Issued Accounting Standards Not Yet Adopted In June 2016, the FASB issued guidance on the measurement of credit losses on financial instruments. This guidance requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. We expect to adopt this guidance on January 1, 2020. The adoption of this guidance requires a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. While we continue to assess all potential impacts of this new standard, Other recent accounting pronouncements issued by the FASB (including its Emerging Issues Task Force), the American Institute of Certified Public Accountants, and the Securities and Exchange Commission did not have, or are not expected to have, a material impact on our present or future consolidated financial statements

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 3. Fair Value Measurements Accounting standards define fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. The standards also establish a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value: • Level 1 — Quoted prices in active markets for identical assets or liabilities. • Level 2 — Assets and liabilities valued based on observable market data for similar instruments, such as quoted prices for similar assets or liabilities. • Level 3 — Unobservable inputs that are supported by little or no market activity; instruments valued based on the best available data, some of which is internally developed, and considers risk premiums that a market participant would require. We applied the following methods and assumptions in estimating our fair value measurements: Cash Equivalents — Cash equivalents consist of highly liquid investments, which include money market funds and commercial paper, with original maturities of less than three months at the acquisition date. The fair value measurement of these assets is based on quoted market prices in active markets and these assets are recorded at fair value. Investments — Our investments consist of fixed income securities, which include U.S. government agency securities, treasury bills, commercial paper, money market funds and corporate notes and bonds. The fair value measurement of these assets is based on observable market-based inputs or inputs that are derived principally from or corroborated by observable market data by correlation or other means. Long-term Debt — The fair values of our long-term debt approximates carrying value based on the borrowing rates currently available to us for loans with similar terms using Level 2 inputs. The following table presents the balances of assets measured at fair value on a recurring basis, by level within the fair value hierarchy, as of the dates presented (in thousands): June 30, 2019 December 31, 2018 Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents: Money market funds $ 13,672 $ — $ 13,672 $ 11,896 $ — $ 11,896 Commercial paper — 998 998 — — — Total cash equivalents 13,672 998 14,670 11,896 — 11,896 Short-term investments: U.S. government agency securities — 19,943 19,943 — 7,482 7,482 Corporate notes and bonds — 4,751 4,751 — 3,736 3,736 Commercial paper — 7,955 7,955 — 9,943 9,943 Treasury bills — 4,996 4,996 — 17,382 17,382 Total short-term investments — 37,645 37,645 — 38,543 38,543 Total $ 13,672 $ 38,643 $ 52,315 $ 11,896 $ 38,543 $ 50,439 We did not have any Level 3 assets as of June 30, 2019 or December 31, 2018. There were no liabilities measured at fair value as of June 30, 2019 or December 31, 2018. The gross unrealized gains or losses on cash equivalents and short-term investments as of June 30, 2019 or December 31, 2018 were not material.

Inventory

Inventory	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Inventory	Note 4. Inventory The following table June 30, 2019 December 31, 2018 Raw materials $ 4,529 $ 3,858 Work-in-process 8,366 13,671 Finished goods 25,015 27,196 Total inventory $ 37,910 $ 44,725

Stock-Based Awards

Stock-Based Awards	6 Months Ended
	Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Awards	Note 5. Stock-Based Awards Stock Options The following table Number of Shares Outstanding at December 31, 2018 3,603 Granted 165 Exercised (163 ) Forfeited or expired (265 ) Outstanding at June 30, 2019 3,340 Vested and exercisable at June 30, 2019 1,356 Restricted Stock Units The following table Number of Shares RSUs PSUs Outstanding at December 31, 2018 32 — Granted 72 247 Vested (1 ) — Forfeited — — Outstanding at June 30, 2019 103 247 PSUs The number of PSUs that ultimately vest will depend on the extent to which we achieve certain 2019 financial metrics: 134,000 PSUs will vest at 100% achievement of these financial metrics and 234,000 PSUs at 175% achievement. We record compensation expense each period based on our estimate of the most probable number of PSUs that will vest and recognize such expense over the related service period. Stock-based compensation expense recognized for the PSUs was $473,000 and $606,000 for the three and six months ended June 30, 2019, respectively. Stock-Based Compensation Expense The following table Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Cost of revenue $ 159 $ 98 $ 303 $ 181 Research and development expense 1,240 822 2,311 1,581 Sales and marketing expense 1,116 931 2,406 1,688 General and administrative expense 1,028 762 2,000 1,228 Total stock-based compensation expense $ 3,543 $ 2,613 $ 7,020 $ 4,678

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 6. Commitments and Contingencies For information on our commitments and contingencies, see Part II, Item 8 (Financial Statements and Supplementary Data, Note 10. Commitments and Contingencies) of our Annual Report on Form 10-K for the year ended December 31, 2018. There have been no material changes to our commitments and contingencies, outside of the ordinary course of our business, as previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2018, except for “Obligations with Third-Parties” and “Litigation” as discussed below. Obligations with Third Parties We have certain non-cancelable obligations, which include obligations with third-party manufacturers who manufacture our products. We are committed to purchase . Litigation From time to time, we are subject to various legal proceedings or claims that arise in the ordinary course of business. We accrue a liability when management believes that it is both probable that a liability has been incurred and the amount of loss can be reasonably estimated. As of June 30, 2019 and December 31, 2018, we have not recorded any such liabilities. The following is a brief description of the more significant legal proceedings. Although we believe that resolving such claims, individually or in aggregate, will not have a material adverse impact on our financial statements, these matters are subject to inherent uncertainties. Federal Securities Class Actions On August 7, 2018, a class action complaint for violation of the federal securities laws was filed in the U.S. District Court for the Central District of California against us, our chief executive officer and chief operating officer. Captioned Schultz v. Impinj, Inc., et al On August 27, 2018, a second-class action complaint for violation of the federal securities laws was filed in the U.S. District Court for the Western District of Washington against us, our chief executive officer, chief operating officer and former chief financial officer. Captioned Montemarano v. Impinj, Inc., et al On October 2, 2018, a third-class action complaint for violation of the federal securities laws was filed in the U.S. District Court for the Western District of Washington against us, our chief executive officer, chief operating officer and former chief financial officer. Captioned Employees’ Retirement System of the City of Baton Rouge and Parish of East Baton Rouge v. Impinj, Inc., et al On January 14, 2019, the U.S. District Court for the Western District of Washington consolidated the Montemarano Baton Rouge New York State Securities Class Action On January 31, 2019, a fourth-class action complaint for violation of the federal securities laws was filed in the Supreme Court of the State of New York for the County of New York against us, our chief executive officer, chief operating officer, former chief financial officer, members of our board of directors and the underwriters of our July 2016 initial public stock offering, or IPO, and December 2016 secondary public offering, or SPO. Captioned Plymouth County Retirement System v. Impinj, Inc., et al. Shareholder Derivative Actions On October 26, 2018, two shareholder derivative actions were filed in the U.S. District Court for the District of Delaware against our chief executive officer, chief operating officer, former chief financial officer and certain of our directors. We are a nominal defendant. On November 8, 2018, a third shareholder derivative action was filed in this same court against the same defendants. Captioned Weiss v. Diorio, et al Fotouhi v. Diorio, et al and De la Fuente v. Diorio, et al.

Debt Facilities

Debt Facilities	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Debt Facilities	Note 7. Debt Facilities On The loans accrue interest, at our option, at (1) a LIBOR rate determined in accordance with the senior credit facility, plus a margin ranging from 2.75% to 3.50%, or (2) a prime rate determined in accordance with the senior credit facility, plus a margin ranging from 0.00% to 0.75%. The margin percentage is determined based upon whether the outstanding borrowing is a term loan or revolving loan and our adjusted EBITDA for the preceding 12-month period. Interest is due and payable in arrears monthly for prime rate loans and at the end of an interest period for LIBOR rate loans. The senior credit facility includes financial and operating covenants, including a minimum liquidity ratio and maximum adjusted EBITDA loss threshold that both apply in the event we do not maintain a minimum liquidity threshold, which are set forth in detail in the credit facility agreement. We were in compliance with the covenants under our senior credit facility as of June 30, 2019. Our obligations under the senior credit facility are collateralized by substantially all our assets other than intellectual property. At 2019 $ — 2020 5,222 2021 7,833 2022 7,833 2023 2,612 Total $ 23,500

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Note 8. Leases The following table presents the components of lease expense Three Months Ended June 30, Six Months Ended June 30, 2019 2019 Operating lease costs (a) Single lease costs $ 1,056 $ 2,102 Variable lease costs 481 900 Sublease income (b) Single sublease income (329 ) (657 ) Variable sublease income (139 ) (278 ) Total operating lease costs $ 1,069 $ 2,067 Finance lease costs: Amortization of right-of-use assets $ 107 $ 222 Interest on lease liabilities 14 32 Total finance lease costs $ 121 $ 254 (a) Includes short-term lease costs, which are immaterial. (b) Sublease income is related to unused office space that was sublet as part of the restructuring in fiscal 2018 where we continue to have the primary obligations. The following table Three Months Ended June 30, Six Months Ended June 30, 2019 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows used in operating leases $ 1,152 $ 2,304 Operating cash flows used in finance leases 14 32 Financing cash flows used in finance leases 136 283 The following table June 30, 2019 Weighted-average remaining lease terms (years) Operating leases 6.5 Finance leases 1.2 Weighted-average discount rate Operating leases 6.8 % Finance leases 9.8 % The following table presents future lease payments Operating Leases Finance Leases Lease Payments Sublease Income Net Lease Payments 2019 $ 2,313 $ (677 ) $ 1,636 $ 255 2020 4,755 (1,373 ) 3,382 270 2021 4,790 (1,414 ) 3,376 — 2022 4,650 (1,457 ) 3,193 — 2023 3,263 (123 ) 3,140 — Thereafter 9,947 — 9,947 — Total lease payments $ 29,718 $ (5,044 ) $ 24,674 $ 525 Less: Interest (5,883 ) (27 ) Present value of lease liabilities 23,835 498 Less: Current portion of lease liabilities (3,207 ) (419 ) Lease liabilities, net of current portion $ 20,628 $ 79 The following table Operating Leases Capital Leases 2019 $ 3,573 $ 575 2020 3,340 270 2021 3,305 — 2022 3,193 — 2023 3,140 — Thereafter 9,947 — Total minimum lease payments $ 26,498 $ 845 Less: Portion representing interest (64 ) Present value of capital lease obligations 781 Less: Current portion of capital lease obligations (523 ) Capital lease obligations net of current portion $ 258

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Net Loss Per Share	Note 9. Net Loss Per Share The following tabl Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Numerator: Net loss $ (4,158 ) $ (7,732 ) $ (11,226 ) $ (22,174 ) Denominator: Weighted-average shares outstanding — basic and diluted 21,709 21,333 21,626 21,229 Net loss per share — basic and diluted $ (0.19 ) $ (0.36 ) $ (0.52 ) $ (1.04 ) The following table presents the outstanding option awards and unvested shares excluded from the computation of diluted net loss per share as of the dates presented because their effect would have been antidilutive (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Stock options and restricted stock units 3,753 3,477 3,730 2,994 Unvested shares of common stock subject to repurchase 3 22 5 26

Restructuring

Restructuring	6 Months Ended
	Jun. 30, 2019
Restructuring And Related Activities [Abstract]
Restructuring	Note 10. Restructuring On we initiated a restructuring plan to align our strategic and financial objectives and optimize our resources for long-term growth, including a reduction-in-force affecting approximately 9% of our employees, subleasing unused office space and closing some remote offices. The restructuring was substantially complete as of June 30, 2018. s a result of the restructuring, we recorded a restructuring benefit of $178,000 and a restructuring charge of $3.7 million for the three and six months ended June 30, 2018, respectively. The following table liabilities for the period presented (in thousands): Employee Termination Benefits Cease-Use Costs Total Balance at December 31, 2018 $ 94 $ 975 $ 1,069 Effect of the new lease standard adoption ( 1) — (975 ) (975 ) Balance at June 30, 2019 $ 94 $ — $ 94 (1)

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segment Information	Note 11. Segment Information We have one operating and reportable segment which has been identified based on how our chief operating decision maker manages our business, makes operating decisions and evaluates operating performance. The chief executive officer acts as the chief operating decision maker and reviews financial and operational information on a consolidated reporting unit. There are no segment managers who are held accountable for operations, operating results or plans for levels or components below the consolidated reporting unit. The chief executive officer reviews information about our revenue categories, which are endpoint ICs and systems. Systems revenue includes sales of reader ICs, modules, readers, gateways and software. The following table presents our revenue by category for the periods presented (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Revenue: Endpoint ICs $ 23,704 $ 20,022 $ 45,549 $ 39,431 Systems 14,486 8,520 25,704 14,179 Total revenue $ 38,190 $ 28,542 $ 71,253 $ 53,610

Deferred Revenue

Deferred Revenue	6 Months Ended
	Jun. 30, 2019
Deferred Revenue Disclosure [Abstract]
Deferred Revenue	Note 12. Deferred Revenue Deferred revenue, consisting of individually immaterial amounts for extended warranty, enhanced maintenance and advanced payments on non-recurring engineering services contracts, represents revenue that has not yet been recognized. The following table Six Months Ended June 30, 2019 2018 Balance at beginning of period $ 834 $ 1,215 Deferral of revenue 471 218 Recognition of deferred revenue (204 ) (705 ) Balance at end of period $ 1,101 $ 728

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements include Impinj, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. These condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, or GAAP, and applicable rules and regulations of the Securities and Exchange Commission, or SEC, regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes as of and for the year ended December 31, 2018 included in Impinj, Inc.’s Annual Report on Form 10-K, which was filed with the SEC on February 28, 2019. The condensed consolidated balance sheet as of December 31, 2018, included herein, was derived from the audited consolidated financial statements of Impinj, Inc. The unaudited condensed consolidated interim financial statements, in the opinion of management, reflect all adjustments, consisting of normal recurring adjustments, necessary to state fairly our financial position, results of operations, and our cash flows for the periods presented. Interim results are not necessarily indicative of the results for a full year or for any other future period.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the periods presented. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, reserve for sales returns and incentives, inventory excess and obsolescence, recoverability of long-lived assets
Leases	Leases We determine whether an arrangement is or contains a lease at inception. Right-of-use, or ROU, assets represent our right to use an identified asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. We use our incremental borrowing rate in determining the present value of lease payments as our operating leases do not provide an implicit rate. Our incremental borrowing rate is based on a credit-adjusted risk-free rate, which best approximates a secured rate over a similar term of lease. Lease expense for lease payments is recognized on a straight-line basis over the lease term. Finance lease ROU assets are included in property and equipment, net in our condensed consolidated balance sheets. We have various non-cancellable operating lease agreements for office, warehouse and research and development space in the U.S., China, Thailand and Malaysia, with expiration dates from 2019 to 2026. Certain of these arrangements have free or escalating rent payment provisions and optional renewal and termination clauses that are factored into our determination of lease payments when appropriate. These lease agreements typically include lease and non-lease components and are generally accounted as a single lease component. Leases with an initial term of 12 months or less are not recorded on our balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards In February 2016, the Financial Accounting Standards Board, or FASB, issued guidance on leases. This standard requires the recognition of a right-of-use asset and lease liability on the balance sheet for all leases. It also requires more detailed disclosures to enable users of financial statements to understand the amount, timing, and uncertainty of cash flows arising from leases. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. We adopted this standard on January 1, 2019 using the effective date modified retrospective transition method and elected the available practical expedients permitted under the transition method, allowing us to carryforward our historical assessments of (1) whether contracts are or contain leases, (2) lease classification, and (3) initial direct costs. As a result of the adoption of this standard, we recorded net operating lease ROU assets and lease liabilities In June 2018, the FASB issued guidance to improve nonemployee share-based payment accounting that requires companies to account for share-based payments granted to nonemployees similar to share-based payments granted to employees. This guidance is effective for fiscal years beginning after December 15, 2018, including the interim periods within those fiscal years. We adopted this standard on January 1, 2019 and the adoption of this guidance In August 2018, the FASB issued guidance to align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This guidance is effective for fiscal years beginning after December 15, 2019, including the interim periods within those fiscal years. Early adoption of this guidance is permitted. We early adopted this guidance prospectively on January 1, 2019 and the adoption of this guidance did not impact our financial positions, results of operations or cash flows.
Recently Issued Accounting Standards Not Yet Adopted	Recently Issued Accounting Standards Not Yet Adopted In June 2016, the FASB issued guidance on the measurement of credit losses on financial instruments. This guidance requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. We expect to adopt this guidance on January 1, 2020. The adoption of this guidance requires a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. While we continue to assess all potential impacts of this new standard, Other recent accounting pronouncements issued by the FASB (including its Emerging Issues Task Force), the American Institute of Certified Public Accountants, and the Securities and Exchange Commission did not have, or are not expected to have, a material impact on our present or future consolidated financial statements

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Summary of Assets Measured at Fair Value on Recurring Basis	The following table presents the balances of assets measured at fair value on a recurring basis, by level within the fair value hierarchy, as of the dates presented (in thousands): June 30, 2019 December 31, 2018 Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents: Money market funds $ 13,672 $ — $ 13,672 $ 11,896 $ — $ 11,896 Commercial paper — 998 998 — — — Total cash equivalents 13,672 998 14,670 11,896 — 11,896 Short-term investments: U.S. government agency securities — 19,943 19,943 — 7,482 7,482 Corporate notes and bonds — 4,751 4,751 — 3,736 3,736 Commercial paper — 7,955 7,955 — 9,943 9,943 Treasury bills — 4,996 4,996 — 17,382 17,382 Total short-term investments — 37,645 37,645 — 38,543 38,543 Total $ 13,672 $ 38,643 $ 52,315 $ 11,896 $ 38,543 $ 50,439

Inventory (Tables)

Inventory (Tables)	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Schedule of Inventories	The following table June 30, 2019 December 31, 2018 Raw materials $ 4,529 $ 3,858 Work-in-process 8,366 13,671 Finished goods 25,015 27,196 Total inventory $ 37,910 $ 44,725

Stock-Based Awards (Tables)

Stock-Based Awards (Tables)	6 Months Ended
	Jun. 30, 2019
Summary of Stock Option Activity	The following table Number of Shares Outstanding at December 31, 2018 3,603 Granted 165 Exercised (163 ) Forfeited or expired (265 ) Outstanding at June 30, 2019 3,340 Vested and exercisable at June 30, 2019 1,356
Summary of Stock-Based Compensation Expense	The following table Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Cost of revenue $ 159 $ 98 $ 303 $ 181 Research and development expense 1,240 822 2,311 1,581 Sales and marketing expense 1,116 931 2,406 1,688 General and administrative expense 1,028 762 2,000 1,228 Total stock-based compensation expense $ 3,543 $ 2,613 $ 7,020 $ 4,678
Restricted Stock Units
Summary of Restricted Stock Units	The following table Number of Shares RSUs PSUs Outstanding at December 31, 2018 32 — Granted 72 247 Vested (1 ) — Forfeited — — Outstanding at June 30, 2019 103 247

Debt Facilities (Tables)

Debt Facilities (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Scheduled Principal Maturities of Debt	The following table 2019 $ — 2020 5,222 2021 7,833 2022 7,833 2023 2,612 Total $ 23,500

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Components of Lease Expense	The following table presents the components of lease expense Three Months Ended June 30, Six Months Ended June 30, 2019 2019 Operating lease costs (a) Single lease costs $ 1,056 $ 2,102 Variable lease costs 481 900 Sublease income (b) Single sublease income (329 ) (657 ) Variable sublease income (139 ) (278 ) Total operating lease costs $ 1,069 $ 2,067 Finance lease costs: Amortization of right-of-use assets $ 107 $ 222 Interest on lease liabilities 14 32 Total finance lease costs $ 121 $ 254 (a) Includes short-term lease costs, which are immaterial. (b) Sublease income is related to unused office space that was sublet as part of the restructuring in fiscal 2018 where we continue to have the primary obligations.
Supplemental Cash Flow Information Related to Leases	The following table Three Months Ended June 30, Six Months Ended June 30, 2019 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows used in operating leases $ 1,152 $ 2,304 Operating cash flows used in finance leases 14 32 Financing cash flows used in finance leases 136 283
Schedule of Weighted-Average Remaining Lease Terms and Weighted-Average Discount Rate Related to Leases	The following table June 30, 2019 Weighted-average remaining lease terms (years) Operating leases 6.5 Finance leases 1.2 Weighted-average discount rate Operating leases 6.8 % Finance leases 9.8 %
Schedule of Future Lease Payments under Operating Leases	The following table presents future lease payments Operating Leases Finance Leases Lease Payments Sublease Income Net Lease Payments 2019 $ 2,313 $ (677 ) $ 1,636 $ 255 2020 4,755 (1,373 ) 3,382 270 2021 4,790 (1,414 ) 3,376 — 2022 4,650 (1,457 ) 3,193 — 2023 3,263 (123 ) 3,140 — Thereafter 9,947 — 9,947 — Total lease payments $ 29,718 $ (5,044 ) $ 24,674 $ 525 Less: Interest (5,883 ) (27 ) Present value of lease liabilities 23,835 498 Less: Current portion of lease liabilities (3,207 ) (419 ) Lease liabilities, net of current portion $ 20,628 $ 79
Schedule of Future Minimum Lease Payments under Operating and Capital Leases	The following table Operating Leases Capital Leases 2019 $ 3,573 $ 575 2020 3,340 270 2021 3,305 — 2022 3,193 — 2023 3,140 — Thereafter 9,947 — Total minimum lease payments $ 26,498 $ 845 Less: Portion representing interest (64 ) Present value of capital lease obligations 781 Less: Current portion of capital lease obligations (523 ) Capital lease obligations net of current portion $ 258

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Reconciliation of the Numerator and Denominator used in Computing Basic and Diluted Net Loss Per Share	The following tabl Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Numerator: Net loss $ (4,158 ) $ (7,732 ) $ (11,226 ) $ (22,174 ) Denominator: Weighted-average shares outstanding — basic and diluted 21,709 21,333 21,626 21,229 Net loss per share — basic and diluted $ (0.19 ) $ (0.36 ) $ (0.52 ) $ (1.04 )
Computation of Diluted Net Loss Per Share Effect in Antidilutive	The following table presents the outstanding option awards and unvested shares excluded from the computation of diluted net loss per share as of the dates presented because their effect would have been antidilutive (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Stock options and restricted stock units 3,753 3,477 3,730 2,994 Unvested shares of common stock subject to repurchase 3 22 5 26

Restructuring (Tables)

Restructuring (Tables)	6 Months Ended
	Jun. 30, 2019
Restructuring And Related Activities [Abstract]
Summary of Changes in Restructuring Liabilities	The following table liabilities for the period presented (in thousands): Employee Termination Benefits Cease-Use Costs Total Balance at December 31, 2018 $ 94 $ 975 $ 1,069 Effect of the new lease standard adoption ( 1) — (975 ) (975 ) Balance at June 30, 2019 $ 94 $ — $ 94 (1)

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Summary of Revenue Category	The following table presents our revenue by category for the periods presented (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Revenue: Endpoint ICs $ 23,704 $ 20,022 $ 45,549 $ 39,431 Systems 14,486 8,520 25,704 14,179 Total revenue $ 38,190 $ 28,542 $ 71,253 $ 53,610

Deferred Revenue (Tables)

Deferred Revenue (Tables)	6 Months Ended
	Jun. 30, 2019
Deferred Revenue Disclosure [Abstract]
Summary of Changes in Deferred Revenue	The following table Six Months Ended June 30, 2019 2018 Balance at beginning of period $ 834 $ 1,215 Deferral of revenue 471 218 Recognition of deferred revenue (204 ) (705 ) Balance at end of period $ 1,101 $ 728

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Accounting Policies [Abstract]
Operating lease right-of-use assets	$ 17,786	$ 18,700
Operating lease, liability	$ 23,835	$ 25,300

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 52,315	$ 50,439
Cash Equivalents
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	14,670	11,896
Cash Equivalents | Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	13,672	11,896
Cash Equivalents | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	998
Short-term Investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	37,645	38,543
Short-term Investments | U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	19,943	7,482
Short-term Investments | Corporate Notes and Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	4,751	3,736
Short-term Investments | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	7,955	9,943
Short-term Investments | Treasury Bills
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	4,996	17,382
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	13,672	11,896
Level 1 | Cash Equivalents
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	13,672	11,896
Level 1 | Cash Equivalents | Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	13,672	11,896
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	38,643	38,543
Level 2 | Cash Equivalents
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	998
Level 2 | Cash Equivalents | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	998
Level 2 | Short-term Investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	37,645	38,543
Level 2 | Short-term Investments | U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	19,943	7,482
Level 2 | Short-term Investments | Corporate Notes and Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	4,751	3,736
Level 2 | Short-term Investments | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	7,955	9,943
Level 2 | Short-term Investments | Treasury Bills
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 4,996	$ 17,382

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 52,315	$ 50,439
Liabilities measured at fair value	0	0
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 0	$ 0

Inventory - Schedule of Invento

Inventory - Schedule of Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 4,529	$ 3,858
Work-in-process	8,366	13,671
Finished goods	25,015	27,196
Total inventory	$ 37,910	$ 44,725

Stock-Based Awards - Summary of

Stock-Based Awards - Summary of Stock Option Activity (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2019shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding, Beginning balance	3,603
Number of Shares, Granted	165
Number of Shares, Exercised	(163)
Number of Shares, Forfeited or expired	(265)
Number of Shares, Outstanding, Ending balance	3,340
Number of Shares, Vested and exercisable	1,356

Stock-Based Awards - Summary _2

Stock-Based Awards - Summary of Restricted Stock Units (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2019shares
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares Outstanding, Balance	32
Number of Shares, Granted	72
Number of Shares, Vested	(1)
Number of Shares Outstanding, Balance	103
Performance Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Granted	247
Number of Shares Outstanding, Balance	247

Stock-Based Awards - Additional

Stock-Based Awards - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	$ 3,543,000	$ 2,613,000	$ 7,020,000	$ 4,678,000
Performance Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted associated with annual cash-bonus program for senior executives and other bonus eligible employees			234,000
Stock based compensation expense	$ 473,000		$ 606,000
Performance Share Units | Vest at 100% Ahievement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares expected to vest upon achievement			134,000
Number of shares expected to vest, achievement percentage			100.00%
Performance Share Units | Vest at 175% Achievement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares expected to vest upon achievement			234,000
Number of shares expected to vest, achievement percentage			175.00%

Stock-Based Awards - Summary _3

Stock-Based Awards - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 3,543	$ 2,613	$ 7,020	$ 4,678
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	159	98	303	181
Research and Development Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,240	822	2,311	1,581
Selling and Marketing Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,116	931	2,406	1,688
General and Administrative Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 1,028	$ 762	$ 2,000	$ 1,228

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Millions	Jun. 30, 2019USD ($)
Commitments And Contingencies Disclosure [Abstract]
Inventory purchase commitment, amount	$ 17.3

Debt Facilities - Senior Credit

Debt Facilities - Senior Credit Facility - Additional Information (Details) - USD ($)	Apr. 26, 2019	Mar. 05, 2018	Jun. 30, 2019	Aug. 17, 2018
Line Of Credit Facility [Line Items]
Term loan outstanding amount			$ 23,500,000
Term Loan
Line Of Credit Facility [Line Items]
Term loan	$ 23,500,000	$ 20,000,000
Amount of outstanding borrowings		$ 7,900,000
Line of credit facility, mature date	Apr. 1, 2023	Mar. 5, 2020
Line of credit facility, amortization period	36 months
Line of credit facility, initial interest-only period	12 months
Line of credit facility, beginning date	May 1, 2020
Term Loan | Term Loan Prepaid On or Before April 26, 2020
Line Of Credit Facility [Line Items]
Percentage of prepayment fee	2.00%
Term Loan | Term Loan Prepaid After April 26, 2020, But On or Before April 26, 2021
Line Of Credit Facility [Line Items]
Percentage of prepayment fee	1.00%
Line of Credit | Silicon Valley Bank
Line Of Credit Facility [Line Items]
Unamortized debt issuance costs			133,000
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 25,000,000	$ 25,000,000
Amount of outstanding borrowings			0
Line of credit facility, mature date	May 1, 2021
Letter of Credit
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 5,000,000	5,000,000
Equipment Term Loan Facility
Line Of Credit Facility [Line Items]
Amount of outstanding borrowings		1,100,000
Equipment Term Loan Facility | Line of Credit
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 4,000,000
General Corporate Purposes
Line Of Credit Facility [Line Items]
Amount available for borrowings		11,000,000
Term Loan
Line Of Credit Facility [Line Items]
Term loan incurred		$ 9,000,000
Term Loan | Line of Credit | Silicon Valley Bank
Line Of Credit Facility [Line Items]
Term loan outstanding amount			$ 23,500,000
Interest rate			6.25%
Term Loan and Revolving Loan | Minimum | LIBOR Rate
Line Of Credit Facility [Line Items]
Line of credit facility, basis rate	2.75%
Term Loan and Revolving Loan | Minimum | Prime Rate
Line Of Credit Facility [Line Items]
Line of credit facility, basis rate	0.00%
Term Loan and Revolving Loan | Maximum | LIBOR Rate
Line Of Credit Facility [Line Items]
Line of credit facility, basis rate	3.50%
Term Loan and Revolving Loan | Maximum | Prime Rate
Line Of Credit Facility [Line Items]
Line of credit facility, basis rate	0.75%

Debt Facilities - Scheduled Pri

Debt Facilities - Scheduled Principal Maturities of Debt (Details) $ in Thousands	Jun. 30, 2019USD ($)
Debt Disclosure [Abstract]
2020	$ 5,222
2021	7,833
2022	7,833
2023	2,612
Total	$ 23,500

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Operating lease costs
Single lease costs	$ 1,056	$ 2,102
Variable lease costs	481	900
Sublease income:
Single sublease income	(329)	(657)
Variable sublease income	(139)	(278)
Total operating lease costs	1,069	2,067
Finance lease costs:
Amortization of right-of-use assets	107	222
Interest on lease liabilities	14	32
Total finance lease costs	$ 121	$ 254

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows used in operating leases	$ 1,152	$ 2,304
Operating cash flows used in finance leases	14	32
Financing cash flows used in finance leases	$ 136	$ 283	$ 483

Leases - Schedule of Weighted-A

Leases - Schedule of Weighted-Average Remaining Lease Terms and Weighted-Average Discount Rate Related to Leases (Details)	Jun. 30, 2019
Weighted-average remaining lease terms (years)
Operating leases	6 years 6 months
Finance leases	1 year 2 months 12 days
Weighted-average discount rate
Operating leases	6.80%
Finance leases	9.80%

Leases - Schedule of Future Lea

Leases - Schedule of Future Lease Payments under Operating Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating Leases, Lease Payments, 2019	$ 2,313
Operating Leases, Lease Payments, 2020	4,755
Operating Leases, Lease Payments, 2021	4,790
Operating Leases, Lease Payments, 2022	4,650
Operating Leases, Lease Payments, 2023	3,263
Operating Leases, Lease Payments, Thereafter	9,947
Operating Leases, Lease Payments, Total lease payments	29,718
Less: Interest	(5,883)
Present value of lease liabilities	23,835	$ 25,300
Less: Current portion of lease liabilities	(3,207)
Operating lease liabilities, net of current portion	20,628
Operating Leases, Sublease Income, 2019	(677)
Operating Leases, Sublease Income, 2020	(1,373)
Operating Leases, Sublease Income, 2021	(1,414)
Operating Leases, Sublease Income, 2022	(1,457)
Operating Leases, Sublease Income, 2023	(123)
Operating Leases, Sublease Income, Total lease payments	(5,044)
Operating Leases, Net, 2019	1,636
Operating Leases, Net, 2020	3,382
Operating Leases, Net, 2021	3,376
Operating Leases, Net, 2022	3,193
Operating Leases, Net, 2023	3,140
Operating Leases, Net, Thereafter	9,947
Operating Leases, Net, Total lease payments	24,674
Finance Leases, Lease Payments, 2019	255
Finance Leases, Lease Payments, 2020	270
Finance Leases, Lease Payments, Total lease payments	525
Less: Interest	(27)
Present value of lease liabilities	498
Less: Current portion of lease liabilities	(419)		$ (523)
Finance lease liabilities, net of current portion	$ 79		$ 258

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments Under Operating and Capital Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
Operating leases, 2019	$ 3,573
Operating leases, 2020	3,340
Operating leases, 2021	3,305
Operating leases, 2022	3,193
Operating leases, 2023	3,140
Operating leases, Thereafter	9,947
Operating leases, Total minimum lease payments	26,498
Capital leases, 2019	575
Capital leases, 2020	270
Capital leases, Total minimum lease payments	845
Less: Portion representing interest	(64)
Present value of capital lease obligations	781
Less: Current portion of capital lease obligations	(523)
Capital lease obligations net of current portion	$ 258

Net Loss Per Share - Reconcilia

Net Loss Per Share - Reconciliation of the Numerator and Denominator used in Computing Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net loss	$ (4,158)	$ (7,068)	$ (7,732)	$ (14,442)	$ (11,226)	$ (22,174)
Denominator:
Weighted-average shares outstanding — basic and diluted	21,709		21,333		21,626	21,229
Net loss per share — basic and diluted	$ (0.19)		$ (0.36)		$ (0.52)	$ (1.04)

Net Loss Per Share - Computatio

Net Loss Per Share - Computation of Diluted Net Loss Per Share Effect in Antidilutive (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock Options and Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	3,753	3,477	3,730	2,994
Unvested Shares of Common Stock Subject to Repurchase
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	3	22	5	26

Restructuring - Additional Info

Restructuring - Additional Information (Details) - USD ($) $ in Thousands	Feb. 13, 2018	Jun. 30, 2018	Jun. 30, 2018
Restructuring And Related Activities [Abstract]
Restructuring initiated date	Feb. 13, 2018
Percentage of employee affected under reduction in force	9.00%
Restructuring costs (benefits)		$ (178)	$ 3,749

Restructuring - Summary of Chan

Restructuring - Summary of Changes in Restructuring Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Restructuring Cost And Reserve [Line Items]
Balance at December 31, 2018	$ 1,069
Balance at June 30, 2019	94
Accounting Standards Update 2016-02
Restructuring Cost And Reserve [Line Items]
Effect of the new lease standard adoption	(975)
Employee Termination Benefits
Restructuring Cost And Reserve [Line Items]
Balance at December 31, 2018	94
Balance at June 30, 2019	94
Employee Termination Benefits | Accounting Standards Update 2016-02
Restructuring Cost And Reserve [Line Items]
Effect of the new lease standard adoption	0
Cease-Use Costs
Restructuring Cost And Reserve [Line Items]
Balance at December 31, 2018	975
Balance at June 30, 2019	0
Cease-Use Costs | Accounting Standards Update 2016-02
Restructuring Cost And Reserve [Line Items]
Effect of the new lease standard adoption	$ (975)

Segment Information - Additiona

Segment Information - Additional Information (Details)	6 Months Ended
	Jun. 30, 2019Segment
Segment Reporting [Abstract]
Number of reportable segments	1

Segment Information - Summary o

Segment Information - Summary of Sales by Product (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Total revenue	$ 38,190	$ 28,542	$ 71,253	$ 53,610
Endpoint ICs
Revenue:
Total revenue	23,704	20,022	45,549	39,431
Systems
Revenue:
Total revenue	$ 14,486	$ 8,520	$ 25,704	$ 14,179

Deferred Revenue - Summary of C

Deferred Revenue - Summary of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Deferred Revenue Disclosure [Abstract]
Balance at beginning of period	$ 834	$ 1,215
Deferral of revenue	471	218
Recognition of deferred revenue	(204)	(705)
Balance at end of period	$ 1,101	$ 728