ShotSpotter (SSTI) 10-Q 8 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 02, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	SSTI
Entity Registrant Name	ShotSpotter, Inc.
Entity Central Index Key	1,351,636
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		10,772,311

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 14,811	$ 19,567
Accounts receivable and unbilled revenue	6,359	3,928
Prepaid expenses and other current assets	1,704	839
Restricted cash	60	30
Total current assets	22,934	24,364
Property and equipment, net	15,134	11,596
Intangible assets, net	95	95
Other assets	1,662	143
Total assets	39,825	36,198
Current liabilities
Accounts payable	2,732	1,627
Deferred revenue, short-term	16,230	15,780
Accrued expenses and other current liabilities	3,127	3,815
Total current liabilities	22,089	21,222
Deferred revenue, long-term	1,212	2,710
Other liabilities	91	104
Total liabilities	23,392	24,036
Stockholders' equity:
Common stock	53	48
Additional paid-in capital	112,639	109,708
Accumulated deficit	(96,156)	(97,595)
Accumulated other comprehensive income (loss)	(103)	1
Total stockholders' equity	16,433	12,162
Total liabilities and stockholders' equity	$ 39,825	$ 36,198

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues	$ 8,927	$ 5,836	$ 15,834	$ 10,398
Costs
Cost of revenues	3,589	2,687	6,897	5,362
Impairment of property and equipment	361		361
Total costs	3,950	2,687	7,258	5,362
Gross profit	4,977	3,149	8,576	5,036
Operating expenses
Sales and marketing	2,195	1,369	3,749	2,477
Research and development	1,255	928	2,491	1,962
General and administrative	1,824	971	3,852	1,901
Total operating expenses	5,274	3,268	10,092	6,340
Operating loss	(297)	(119)	(1,516)	(1,304)
Other income (expense), net
Remeasurement of convertible preferred stock warrant liability		(3,725)		(3,725)
Interest income (expense), net	22	(445)	49	(810)
Other expense, net	(76)	(17)	(75)	(28)
Total other income (expense), net	(54)	(4,187)	(26)	(4,563)
Loss before income taxes	(351)	(4,306)	(1,542)	(5,867)
Provision for income taxes	18		44
Net loss	$ (369)	$ (4,306)	$ (1,586)	$ (5,867)
Net loss per share, basic and diluted	$ (0.03)	$ (1.16)	$ (0.15)	$ (2.19)
Weighted average shares used in computing net loss per share, basic and diluted	10,589,038	3,724,760	10,329,874	2,678,787

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (369)	$ (4,306)	$ (1,586)	$ (5,867)
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(133)	(6)	(104)	(19)
Comprehensive loss	$ (502)	$ (4,312)	$ (1,690)	$ (5,886)

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Cash flows from operating activities:
Net loss		$ (369)	$ (4,306)	$ (1,586)	$ (5,867)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization				1,775	1,408
Impairment of property and equipment		361		361
Stock-based compensation				1,075	75
Amortization of debt issuance costs					84
Remeasurement of convertible preferred stock warrant liability			3,725		3,725
Changes in operating assets and liabilities:
Accounts receivable and unbilled revenue				(2,431)	(666)
Prepaid expenses and other assets				(568)	(201)
Accounts payable				1,105	(307)
Accrued expenses and other current liabilities				(701)	(216)
Deferred revenue				134	3,049
Net cash provided by (used in) operating activities				(836)	1,084
Cash flows from investing activities:
Purchase of property and equipment				(5,643)	(2,870)
Investment in intangible and other assets				(26)	(24)
Net cash used in investing activities				(5,669)	(2,894)
Cash flows from financing activities:
Proceeds from initial public offering, net of commissions and discounts	$ 32,400				32,426
Proceeds from notes payable					1,500
Payment of debt issuance costs					(30)
Payments of offering costs					(846)
Proceeds from exercise of stock options				450	10
Proceeds from exercise of warrants				989
Proceeds from Employee Stock Purchase Plan				421
Net cash provided by financing activities				1,860	33,060
Increase (decrease) in cash and cash equivalents				(4,645)	31,250
Effect of exchange rate on cash and cash equivalents				(81)	5
Cash, cash equivalents and restricted cash at beginning of year				19,597	3,895	$ 3,895
Cash, cash equivalents and restricted cash at end of period	35,150	$ 14,871	$ 35,150	14,871	35,150	$ 19,597
Supplemental cash flow disclosures:
Cash paid for interest					721
Supplemental disclosure of non-cash financing activities:
Conversion of convertible preferred stock into common stock					42,075
Reclassification of convertible preferred stock warrant liability into additional paid-in capital	$ 5,700				5,711
Issuance of warrants in connection with the issuance of notes payable to a financial institution					111
Deferred offering costs included in other assets				$ 66	$ 986

Organization and Description of

Organization and Description of Business	6 Months Ended
	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Description of Business	Note 1. Organization and Description of Business ShotSpotter, Inc. (the “Company”) provides gunshot detection solutions that help law enforcement officials and security personnel identify, locate and deter gun violence. The Company offers its software solutions on a SaaS-based subscription model to its customers. The Company’s principal executive offices are located in Newark, California. The Company has one subsidiary, ShotSpotter (Pty) Ltd. formed in South Africa.

Initial Public Offering

Initial Public Offering	6 Months Ended
	Jun. 30, 2018
Initial Public Offering [Abstract]
Initial Public Offering	Note 2. Initial Public Offering In June 2017, the Company completed its initial public offering (“IPO”) in which the Company sold 3,220,000 shares of its common stock at a price of $11.00 per share. The Company received net proceeds of $32.4 million, after underwriting discounts and commissions, which was recorded to additional paid-in capital. The Company’s common stock commenced trading on the NASDAQ Capital Market on June 7, 2017 under the trading symbol “SSTI.” • Immediately prior to the IPO, all outstanding Series B-1 convertible preferred stock warrants were remeasured at fair value using the Black-Scholes model, resulting in a loss of $3.7 million, which was recorded in other expense, net. • Upon the closing of the IPO, the entire balance of $5.7 million in convertible preferred stock warrant liability was reclassified to additional paid-in capital. All preferred stock warrants were converted into common stock warrants. In addition, the Company issued to the lead underwriter in the IPO a warrant to purchase up to 84,000 shares of its common stock. See Note 8, Convertible Preferred Stock Warrants and Common Stock Warrants , for further details regarding the warrants. • Upon the closing of the IPO, all shares of the then-outstanding convertible preferred stock were converted into 4,689,753 shares of common stock. This resulted in a reclassification of $42.1 million to additional paid-in capital. • Offering costs incurred by the Company were approximately $1.9 million, excluding underwriting commissions and discounts, which was recorded to additional paid-in capital.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 3. Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated financial statements include the results of the Company and its wholly-owned subsidiary, ShotSpotter (Pty) Ltd. All significant intercompany transactions have been eliminated during consolidation. The condensed consolidated balance sheet as of December 31, 2017, included herein, was derived from the audited consolidated financial statements as of that date, but does not include all disclosures including certain notes required by U.S. GAAP on an annual reporting basis. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year 2018 or any future period. June 2017 Amended and Restated Certificate of Incorporation Prior to the IPO, the Company’s Board of Directors (the “Board”) and stockholders approved an amendment (the “Charter Amendment”) to the Pre-IPO Certificate (as defined below) and an amended and restated certificate of incorporation (“Post-IPO Certificate”) that became effective on June 12, 2017. The Charter Amendment increased the number of authorized shares of common stock from 8,600,000 to 500,000,000. Under the Post-IPO Certificate, the Company is authorized to issue two classes of stock to be designated Common Stock and Preferred Stock. See Note 6, Capital Stock March 2017 Amendment and Restatement of Certificate of Incorporation On March 27, 2017, the Company’s Board and stockholders approved an amendment and restatement of the Company’s then-existing certificate of incorporation (as so amended and restated, the “Pre-IPO Certificate”) to provide, among other changes, that each share of Series A-2 convertible preferred stock would automatically convert into 0.715548 shares of common stock upon the consummation of an initial public offering of the Company’s capital stock. All share and per share data related to balance sheet and net loss information in the accompanying condensed consolidated financial statements and their related notes have been retroactively adjusted to give effect to the application of this conversion feature when presenting the Series A-2 convertible preferred stock on an as-converted basis. The Pre-IPO Certificate also provided for (1) an increase in the total number of authorized shares to 14,550,000 and (2) an increase in the number of authorized shares of common stock to 8,600,000, in each case to accommodate the new conversion feature for the outstanding shares of Series A-2 convertible preferred stock. All share and per share data in the accompanying condensed consolidated financial statements and their related notes for all periods presented have been retroactively adjusted to give effect to the reverse stock split. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and reported amounts of revenues and expenses during the reporting period. On an ongoing basis, management evaluates its significant estimates including the valuation of accounts receivable, the lives of tangible and intangible assets, stock-based compensation expense, preferred stock warrant liabilities, and accounting for revenue recognition and income taxes. Management bases its estimates on historical experience and on various other market-specific and relevant assumptions it believes to be reasonable under the circumstances. Actual results could differ from those estimates and such differences could be material to the Company’s financial position and results of operations. Revenue Recognition The Company generates substantially all of its revenues from the sale of gunshot detection subscription services, in which gunshot data generated by Company-owned sensors and software is sold to customers through a cloud-based hosting application for a specified contract period. Typically, the initial contract period is one to five years in length. The subscription contract is generally noncancelable without cause. Generally, these service arrangements do not provide the customer with the right to take possession of the hardware or software supporting the subscription service at any time. A small portion of the Company’s revenues are generated from the delivery of setup services to install Company-owned sensors in the customer’s coverage area and other services including training and license to integrate with third-party applications. The Company generally invoices customers for 50% of the total contract value when the contract is fully executed and for the remaining 50% when the subscription service is operational and ready to go live – that is, when the customer has acknowledged the completion of all the deliverables in the signed customer acceptance form. The Company generally invoices subscription service renewals for 100% of the total contract value when the renewal contract is executed. For the public safety solution, the pricing model is based on a per-square-mile basis. For security solutions, the pricing model is on a customized-site basis. As a result of the process for invoicing contracts and renewals upon execution, cash flows from operations and accounts receivable can fluctuate due to timing of contract execution and timing of deployment. Prior to the adoption of Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers ("Topic 606"), Revenue Recognition • Persuasive evidence of an arrangement exists • Delivery has occurred or services have been rendered • The sales price is fixed or determinable • Collection of the related receivable is reasonably assured Under ASC 605, the Company recognized subscription revenues ratably over the subscription period committed by the customer and commencing when the subscription service was fully operational and ready to go live, that is, upon completion of all deliverables stated in the signed customer acceptance form, assuming all other revenue recognition criteria were met. The Company recognized revenues from setup fees ratably based on the expected customer relationship period, typically over five years, which could extend beyond the initial contract period. In determining the expected customer relationship period, the Company considered specific customer details and renewal history with similar customers. If a customer declined to renew its subscription prior to the end of five years, then the remaining setup fees were immediately recognized. Effective January 1, 2018, after the adoption of Topic 606, the Company recognizes revenue upon the satisfaction of performance obligations. At contract inception, the Company assesses the services promised in its contracts with customers and identifies a performance obligation for each promise to transfer to the customer a good or service (or bundle of services) that is distinct. To identify the performance obligations, the Company considers all of the services promised in the contract regardless of whether they are explicitly stated or are implied by customary business practices. The Company determined that the subscription services, training, and licenses to integrate with third-party applications are each distinct services that represent separate performance obligations. The setup activities are not distinct from the subscription service and are combined into the subscription service performance obligation. However, setup fees may provide a material right to the customer that has influence over the customers' decision to renew. All setup fees are assessed on a quantitative and qualitative basis to determine whether they represent a distinct performance obligation. The total contract value is allocated to each performance obligation identified based on the standalone selling price of the service. Discounts are allocated pro-rata to the identified performance obligations. Revenues from subscription services are recognized ratably, on a straight-line basis, over the term of the subscription. Revenues from material rights are recognized ratably over the period in which they are determined to provide a material right to the customer, which is generally three years. Revenues from training and licenses to integrate with third-party applications are recognized upon delivery which generally occurs when the subscription service is operational and ready to go live and these amounts are immaterial. Subscription renewal fees are recognized ratably over the term of the renewal, which is typically one year. While most customers elect to renew their agreements, in some cases, they may not be able to obtain the proper approvals or funding to complete the renewal prior to expiration. For these customers, the Company stops recognizing subscription revenues at the end of the current contract term, even though services may continue to be provided for a period of time until the renewal process is completed. Once the renewal is complete, the Company recognizes subscription revenues for the period between the expiration of the term of the agreement and the completion of the renewal process in the month in which the renewal is executed. If a customer declines to renew its subscription prior to the end of three years, then the remaining fees from material rights, if any, are immediately recognized. As of January 1, 2018, upon the adoption of ASC 606, the Company had total short-term and long-term deferred revenue of $17.3 million. During the three months ended June 30, 2018, the Company recognized $6.4 million in revenue from the beginning deferred revenue balance and $2.3 million from new billings, and added $8.1 million to total short-term and long-term deferred revenue from new billings. During the six months ended June 30, 2018, the Company recognized $11.7 million in revenue from beginning deferred revenue of $18.1 million and $3.9 million from new billings, and added $15.8 million to total short-term and long-term deferred revenue from new billings. As of June 30, 2018, the Company has estimated remaining performance obligations for contractually committed revenues of $12.8 million, $14.8 million, $11.0 million, $7.6 million, and $600,000 that will be recognized during the remainder of the year ended December 31, 2018, and years ended December 31, 2019, 2020, 2021, and 2022 through 2024, respectively. The timing of revenue recognition includes estimates of go live dates for contracts not yet live. Contractually committed revenue includes deferred revenue as of June 30, 2018 and amounts under contract that will be invoiced after June 30, 2018. During the three months ended June 30, 2018, the Company recognized revenues of $8.7 million from customers in the United States and $0.2 million from a customer in South Africa. During the six months ended June 30, 2018, the Company recognized revenues of $15.3 million from customers in the United States and $0.5 million from a customer in South Africa. Topic 606 also requires the capitalization of certain incremental costs of obtaining a contract, which impacts the period in which the Company records sales commissions expense. Historically, the Company recognized sales commissions expense upfront. Under Topic 606, the Company is required to capitalize these expenses. As there are not commensurate commissions earned on renewals of the subscription services, the Company concluded that the capitalized commissions are related to subscription services provided under both the initial contract and renewal periods. Therefore, the amortization period for the capitalized commissions is the customer life, which is determined to be five years. As the capitalized commissions are related to subscription services that are transferred over the customer's life, the Company amortizes the capitalized commissions on a straight-line basis of five years. For commissions that are earned on renewal contracts with an original duration of one year or less, the Company uses the practical expedient applicable to such commissions and recognizes the commissions as expense instead of capitalizing. Accounts Receivable, net Accounts receivable consist of trade accounts receivables from the Company’s customers, net of allowance for doubtful accounts if deemed necessary. Accounts receivable may include unbilled amounts which are under contract but are not yet billable. Accounts receivables are recorded at the invoiced amount. The Company does not require collateral or other security for accounts receivable. The Company periodically evaluates the collectability of its accounts receivable and provides an allowance for potential credit losses based on the historical experience. At June 30, 2018 and December 31, 2017, the Company did not have an allowance for potential credit losses as there were no estimated credit losses. Concentrations of Risk Credit Risk – Financial instruments that potentially subject the Company to concentration of credit risk consisted primarily of restricted cash, cash and cash equivalents and accounts receivable from trade customers. The Company maintains its cash deposits at two domestic financial institutions. The Company is exposed to credit risk in the event of default by a financial institution to the extent that cash and cash equivalents are in excess of the amount insured by the Federal Deposit Insurance Corporation. The Company generally places its cash and cash equivalents with high-credit quality financial institutions. To date, the Company has not experienced any losses on its cash and cash equivalents Concentration of Accounts Receivable –As of June 30, 2018, two customers accounted for 31% and 25% of the Company’s accounts receivable. Fluctuations in accounts receivable result from timing of the Company’s execution of contracts and collection of related payments. As of December 31, 2017, three customers accounted for 18%, 18% and 14% of the Company’s accounts receivable. Concentration of Revenues –For the three months ended June 30, 2018, two customers accounted for 24% and 14% of the Company’s total revenues. For the three months ended June 30, 2017, one customer accounted for 17% of the Company’s total revenues. For the six months ended June 30, 2018, two customers accounted for 22% and 16% of the Company’s total revenues. For the six months ended June 30, 2017, one customer accounted for 17% of the Company’s total revenues. Accounting Pronouncements Recently Adopted Effective January 1, 2018, the Company adopted Topic 606. The impact from the adoption of Topic 606 was as follows: Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 As Reported Effect of Change Increase/ (Decrease) Amounts Without Adoption of Topic 606 As Reported Effect of Change Increase/ (Decrease) Amounts Without Adoption of Topic 606 Revenues $ 8,927 $ 69 $ 8,858 $ 15,834 $ 122 $ 15,712 Costs 3,950 — 3,950 7,258 — 7,258 Gross profit 4,977 69 4,908 8,576 122 8,454 Sales and marketing expense 2,195 (116 ) 2,311 3,749 (257 ) 4,006 Operating loss (297 ) (185 ) (482 ) (1,516 ) (379 ) (1,895 ) Net loss (369 ) (185 ) (554 ) (1,586 ) (379 ) (1,965 ) As of June 30, 2018 As Reported Effect of Change Increase/ (Decrease) Amounts Without Adoption of Topic 606 Assets Prepaid expenses and other current assets $ 1,704 $ 564 $ 1,140 Other assets 1,662 1,460 202 Total assets 39,825 2,024 37,801 Liabilities Deferred revenue, short term 16,230 515 15,715 Total current liabilities 22,089 515 21,574 Deferred revenue, long term 1,212 (1,182 ) 2,394 Total liabilities 23,392 (667 ) 24,059 In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments In October 2016, the FASB issued ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory In November 2016, the FASB issued ASU 2016-18, Restricted Cash In May 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting Compensation – Stock Compensation Recent Accounting Pronouncements Not Yet Effective In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In July 2017, the FASB issued ASU 2017-11 , Earnings Per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), Derivatives and Hedging (Topic 815).

Details of Certain Condensed Co

Details of Certain Condensed Consolidated Balance Sheet Accounts	6 Months Ended
	Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]
Details of Certain Consolidated Balance Sheet Accounts	Note 4. Details of Certain Condensed Consolidated Balance Sheet Accounts Prepaid expenses and other current assets (in thousands): June 30, December 31, 2018 2017 Prepaid software and licenses $ 332 $ 407 Prepaid insurance 580 211 Other prepaid expenses 150 137 Deferred commissions 564 — Other 78 84 $ 1,704 $ 839 Other assets (in thousands): June 30, December 31, 2018 2017 Deferred commissions $ 1,460 $ — Other 202 143 $ 1,662 $ 143 Accrued expenses and other current liabilities (in thousands): June 30, December 31, 2018 2017 Payroll liabilities $ 1,136 $ 1,697 Accrued employee paid time off 564 469 Accrued commissions 180 199 Accrued ESPP 91 115 Royalties payable 143 125 Professional fees 160 328 Use and other taxes 400 406 Other 453 476 $ 3,127 $ 3,815

Impairment of Property and Equi

Impairment of Property and Equipment	6 Months Ended
	Jun. 30, 2018
Property Plant And Equipment [Abstract]
Impairment of Property and Equipment	Note 5. Impairment of Property and Equipment During the three months ended June 30, 2018 the Company recognized the expense of $0.4 million for the impairment of property and equipment relating to the remaining book value of indoor sensor networks installed at certain security customers. During the year ended December 31, 2017, the Company recognized impairment expense of $0.8 million for the impairment of property and equipment relating to the remaining book value of deployed equipment in Puerto Rico and the U.S. Virgin Islands. Management concluded that the impairment charges were required because the equipment was presumed destroyed by the hurricanes in September 2017. The Company also recognized $0.9 million in revenues relating to the remaining deferred set-up fees to be recognized on contracts with customers in Puerto Rico and the U.S. Virgin Islands. Management concluded that the revenues associated with these contracts was required to be accelerated because the contracts with customers in Puerto Rico and the U.S. Virgin Islands were expired at the time of the hurricanes and all subscription services were fully delivered.

Capital Stock

Capital Stock	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Capital Stock	Note 6. Capital Stock Convertible Preferred Stock Immediately prior to the IPO, the Company had the following outstanding convertible preferred stock: Shares Authorized Shares Issued and Outstanding Aggregate Liquidation Preference (in thousands) Series B-1 4,773,000 3,848,023 $ 22,575 Series A-2 1,177,000 1,176,423 20,000 $ 42,575 Upon the closing of the IPO, all shares of convertible preferred stock then outstanding were automatically converted into an aggregate of 4,689,753 shares of common stock, resulting in the reclassification of the related redeemable convertible preferred stock into $23,000 of common stock and $42.1 million into additional paid-in capital. As of June 30, 2018, there were no shares of convertible preferred stock outstanding. Common Stock The Company is authorized to issue 500,000,000 shares of common stock, with a par value of $0.005 and each outstanding share of common stock is entitled to one vote, as provided in the Post-IPO Certificate. At June 30, 2018, there were 10,759,719 shares of common stock issued and outstanding. At December 31, 2017, there were 9,827,129 shares of common stock issued and outstanding. Preferred Stock The Company is authorized to issue 20,000,000 shares of preferred stock, with a par value of $0.005, as provided in the Post-IPO Certificate. As of June 30, 2018, there were no shares of preferred stock issued and outstanding.

Net Loss per Share

Net Loss per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Net Loss per Share	Note 7. Net Loss per Share The following table summarizes the computation of basic and diluted net loss per share (in thousands, except share and per share data): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Numerator: Net loss $ (369 ) $ (4,306 ) $ (1,586 ) $ (5,867 ) Denominator: Weighted-average shares outstanding, basic and diluted 10,589,038 3,724,760 10,329,874 2,678,787 Net loss per share $ (0.03 ) $ (1.16 ) $ (0.15 ) $ (2.19 ) The following potentially dilutive shares outstanding at the end of the periods presented were excluded in the calculation of diluted net loss per share as the effect would have been anti-dilutive: As of June 30, 2018 2017 Options to purchase common stock 828,822 1,303,336 Unvested restricted stock units 110,764 — Warrants to purchase Series B-1 convertible preferred or common stock 173,110 714,596 Total 1,112,696 2,017,932

Convertible Preferred Stock War

Convertible Preferred Stock Warrants and Common Stock Warrants	6 Months Ended
	Jun. 30, 2018
Warrants And Rights Note Disclosure [Abstract]
Convertible Preferred Stock Warrants and Common Stock Warrants	Note 8. Convertible Preferred Stock Warrants and Common Stock Warrants Immediately prior to the Company’s IPO, all outstanding Series B-1 convertible preferred stock warrants were remeasured to their fair value, using the Black-Scholes model. Refer to Note 3, Summary of Significant Accounting Policie Upon the closing of the IPO, the entire balance of $5.7 million in convertible preferred stock warrant liability was reclassified to additional paid-in capital. All convertible preferred stock warrants were converted into common stock warrants. In addition, the Company issued to the lead underwriter in the IPO a warrant to purchase up to 84,000 shares of its common stock. As of June 30, 2018, the Company had the following common stock warrants issued and outstanding (in thousands, except share and per share data): Warrant Class Shares Issuance Date Price per Share Expiration Date Common stock warrant 3,766 July 2012 $ 5.8667 July 2019 Common stock warrant 34,628 August 2012 $ 5.8667 August 2019 Common stock warrant 50,716 February 2014 $ 0.1700 February 2021 Common stock warrant (1) 84,000 June 2017 $ 13.2000 June 2020 173,110 (1 ) This warrant was issued to the Company’s lead underwriter in connection with the IPO.

Equity Incentive Plans

Equity Incentive Plans	6 Months Ended
	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity Incentive Plans	Note 9. Equity Incentive Plans 2017 Equity Incentive Plan In May 2017, the Board and the Company’s stockholders approved the 2017 Equity Incentive Plan (the “2017 Plan”), which became effective in connection with the IPO. The 2017 Plan provides for the issuance of stock options, restricted stock units and other awards to employees, directors and consultants of the Company. A total of 2,413,659 shares of the Company’s common stock were initially reserved for issuance under the 2017 Plan, which is the sum of (1) 900,000 shares, (2) the number of shares reserved for issuance under the 2005 Plan at the time the 2017 Plan became effective and (3) shares subject to stock options or other stock awards under the 2005 Plan that would have otherwise been returned to the 2005 Plan (up to a maximum of 1,314,752 shares). Under an “evergreen” provision, the number of shares of common stock reserved for issuance under the 2017 Plan will automatically increase on January 1 of each year, beginning on January 1, 2018 and ending on and including January 1, 2027, by of 5% of the total number of shares of our capital stock outstanding on December 31 of the preceding calendar year or a lesser number of shares determined by our Board of Directors. In accordance with the evergreen provision, the number of shares of common stock reserved for issuance under our 2017 Plan was automatically increased on January 1, 2018 by 491,356 shares, which was equal to 5% of the total number of shares of capital stock outstanding on December 31, 2017. 2005 Stock Plan In February 2005, the Company adopted the 2005 Stock Plan, as amended in January 2010 and November 2012 (the “2005 Plan”). Under the 2005 Plan provisions, the Company was authorized to grant incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock units, and shares of restricted stock. Following the effectiveness of the 2017 Plan in connection with the IPO, no further grants will be made under the 2005 Plan. A summary of option activities under the 2005 Plan and 2017 Plan during the six months ended June 30, 2018 is as follows: Number of Options Outstanding Weighted Average Exercise Price Outstanding as of December 31, 2017 1,294,128 $ 1.79 Granted 102,746 $ 28.80 Exercised (553,216 ) $ 0.81 Canceled (14,836 ) $ 4.11 Outstanding as of June 30, 2018 828,822 $ 5.75 During the six months ended June 30, 2018, the Company granted executive management restricted stock unit (“RSU”) awards totaling 92,883 shares of common stock, with vesting terms of 35% upon the first anniversary and 21.667% on each of the three subsequent anniversaries. The weighted average fair value of $17.87 per unit was calculated using the closing stock price on the grant dates. During the six months ended June 30, 2018, the Company granted directors RSU awards totaling 17,881 shares of common stock. The fair value of $28.45 per unit was calculated using the closing price on the grant date. Our 2017 Plan include stock options, restricted stock units and other stock awards. The number of shares available for grant under these plans was 1,296,557 as of June 30, 2018. 2017 Employee Stock Purchase Plan In May 2017, the Board and the Company’s stockholders adopted the 2017 Employee Stock Purchase Plan (“2017 ESPP”), which became effective in connection with the Company’s IPO. The 2017 ESPP allows eligible employees to purchase shares of the Company’s common stock in an offering at a discount of the then-current trading price, up to the lesser of (1) 85% of the fair market value of the common stock on the first day of the IPO or (2) 85% of the fair market value of the common stock on the purchase date. The 2017 ESPP permits the maximum discounted purchase price permitted under U.S. tax rules, including a “lookback.” The 2017 ESPP initial offering period runs for approximately 24 months in length, and contains four 6-month purchase periods. An employee’s purchase rights terminate immediately upon termination of employment or other withdrawal from the 2017 ESPP. No participant will have the right to purchase shares of common stock in an amount that has a fair market value of more than $25,000 determined as of the first day of the applicable purchase period, for each calendar year. There are 200,000 shares of common stock reserved for issuance under the 2017 ESPP. In addition, the 2017 ESPP contains an “evergreen” provision which provides for an automatic annual share increase on January 1 of each year, in an amount equal to the lesser of (1) 2% of the total number of shares of common stock outstanding on December 31 st The Company accounts for employee stock purchases made under its 2017 ESPP using the estimate grant date fair value of accounting in accordance with ASC 718, Stock Compensation There were 43,624 shares issued under the 2017 ESPP during the six months ended June 30, 2018. Total stock-based compensation expense associated with the 2005 Plan, 2017 Plan and 2017 ESPP is recorded in the condensed consolidated statements of operations and was allocated as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Cost of revenues $ 75 $ 9 $ 132 $ 10 Sales and marketing 199 15 265 20 Research and development 68 9 108 16 General and administrative 306 19 570 29 Total $ 648 $ 52 $ 1,075 $ 75

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 10. Commitments and Contingencies Operating Lease The Company leases its principal executive offices in Newark, California, under a non-cancelable operating lease which expires in 2021. The Company recognizes rent expense on a straight-line basis over the expected lease term. The difference between cash payments required and rent expense is recorded as deferred rent. Rent expense for the Company’s facilities was $0.1 million for both the three months ended June 30, 2018 and 2017. Rent expense for the Company’s facilities was $0.2 million for both the six months ended June 30, 2018 and 2017. The following is a schedule of future minimum lease payments under the non-cancelable operating lease at June 30, 2018 (in thousands): 2018 (remainder of year) $ 185 2019 352 2020 357 2021 304 2022 — Total $ 1,198 Contingencies On November 6, 2017, three individuals, Ken Fisher, Kevin Baxter and Fred Holmes (the “Contractors”), filed a complaint with the Superior Court of California, County of Alameda, alleging breach of contract, a breach of the implied covenant of good faith and fair dealing and violation of Section 17200 et seq. of the California Business and Professions Code, purportedly predicated on an alleged breach of Section 10b-5 of the Securities Exchange Act of 1934. On the basis of these allegations, the Contractors petitioned for approximately $6.5 million in damages. The Contractors filed a First Amended Complaint on November 22, 2017, adding claims for promissory estoppel, conversion, anticipatory breach of contract, and unjust enrichment. The Contractors then sought a writ of attachment in regards to their alleged damages, which the court denied on December 21, 2017. The Contractors subsequently filed a motion seeking leave of court to file a Second Amended Complaint (“SAC”) on January 26, 2017. The motion was granted and on March 2, 2018 the Contractors filed a SAC asserting claims for breach of contract, anticipatory breach of contract, breach of the implied covenant, and conversion. On April 26, 2018, the Contractors filed a motion for leave to file a Third Amended Complaint (“TAC”). The Court granted the motion, and on June 14, 2018, the Contractors filed a TAC alleging breach of contract, breach of the covenant of good faith and fair dealing, conversion, violation of Section 10(b) of the Securities Exchange Act of 1934 and Rule 10b-5, violation of Section 17200 et seq. of the California Business and Professions Code, Material Misrepresentations in Violation of Cal. Civ. Code § 1710, Negligent Misrepresentation, Fraudulent Concealment, violation of S.E.C. Rule 701 and 17 C.F.R. § 230.701, and Rescission. The TAC alleges that the Contractors were entitled to be granted options to purchase more than 250,000 shares of our common stock on the basis of a term sheet between us and the Contractors signed in July 2007. The Contractors claim that our subsequent one-for-five and one-for-17 reverse stock splits should not apply to their option awards. On the basis of their allegations, the Contractors have petitioned for damages, including punitive damages, and other costs and expenses, including attorneys’ fees. The parties recently agreed to participate in a private mediation in an effort to resolve the dispute. We believe that the Contractors’ claims are without merit and intend to dispute them vigorously. The Company may become subject to legal proceedings, as well as demands and claims that arise in the normal course of our business. Such claims, even if not meritorious, could result in the expenditure of significant financial and management resources. The Company makes a provision for a liability relating to legal matters when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed and adjusted to include the impacts of negotiations, estimated settlements, legal rulings, advice of legal counsel, and other information and events pertaining to a particular matter. An unfavorable outcome on any such matters could require us to pay substantial damages, or, in connection with any intellectual property infringement claims, could require us to pay ongoing royalty payments or could prevent us from selling certain of our products. As a result, a settlement of, or an unfavorable outcome on, any of the matters referenced above or other litigation matters could have a material adverse effect on our business, operating results, financial condition and cash flows.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Note 11. Subsequent Events None.

Summary of Significant Accoun17

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated financial statements include the results of the Company and its wholly-owned subsidiary, ShotSpotter (Pty) Ltd. All significant intercompany transactions have been eliminated during consolidation. The condensed consolidated balance sheet as of December 31, 2017, included herein, was derived from the audited consolidated financial statements as of that date, but does not include all disclosures including certain notes required by U.S. GAAP on an annual reporting basis. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year 2018 or any future period.
June 2017 Amended and Restated Certificate of Incorporation	June 2017 Amended and Restated Certificate of Incorporation Prior to the IPO, the Company’s Board of Directors (the “Board”) and stockholders approved an amendment (the “Charter Amendment”) to the Pre-IPO Certificate (as defined below) and an amended and restated certificate of incorporation (“Post-IPO Certificate”) that became effective on June 12, 2017. The Charter Amendment increased the number of authorized shares of common stock from 8,600,000 to 500,000,000. Under the Post-IPO Certificate, the Company is authorized to issue two classes of stock to be designated Common Stock and Preferred Stock. See Note 6, Capital Stock
March 2017 Amendment and Restatement of Certificate of Incorporation	March 2017 Amendment and Restatement of Certificate of Incorporation On March 27, 2017, the Company’s Board and stockholders approved an amendment and restatement of the Company’s then-existing certificate of incorporation (as so amended and restated, the “Pre-IPO Certificate”) to provide, among other changes, that each share of Series A-2 convertible preferred stock would automatically convert into 0.715548 shares of common stock upon the consummation of an initial public offering of the Company’s capital stock. All share and per share data related to balance sheet and net loss information in the accompanying condensed consolidated financial statements and their related notes have been retroactively adjusted to give effect to the application of this conversion feature when presenting the Series A-2 convertible preferred stock on an as-converted basis. The Pre-IPO Certificate also provided for (1) an increase in the total number of authorized shares to 14,550,000 and (2) an increase in the number of authorized shares of common stock to 8,600,000, in each case to accommodate the new conversion feature for the outstanding shares of Series A-2 convertible preferred stock.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and reported amounts of revenues and expenses during the reporting period. On an ongoing basis, management evaluates its significant estimates including the valuation of accounts receivable, the lives of tangible and intangible assets, stock-based compensation expense, preferred stock warrant liabilities, and accounting for revenue recognition and income taxes. Management bases its estimates on historical experience and on various other market-specific and relevant assumptions it believes to be reasonable under the circumstances. Actual results could differ from those estimates and such differences could be material to the Company’s financial position and results of operations.
Revenue Recognition	Revenue Recognition The Company generates substantially all of its revenues from the sale of gunshot detection subscription services, in which gunshot data generated by Company-owned sensors and software is sold to customers through a cloud-based hosting application for a specified contract period. Typically, the initial contract period is one to five years in length. The subscription contract is generally noncancelable without cause. Generally, these service arrangements do not provide the customer with the right to take possession of the hardware or software supporting the subscription service at any time. A small portion of the Company’s revenues are generated from the delivery of setup services to install Company-owned sensors in the customer’s coverage area and other services including training and license to integrate with third-party applications. The Company generally invoices customers for 50% of the total contract value when the contract is fully executed and for the remaining 50% when the subscription service is operational and ready to go live – that is, when the customer has acknowledged the completion of all the deliverables in the signed customer acceptance form. The Company generally invoices subscription service renewals for 100% of the total contract value when the renewal contract is executed. For the public safety solution, the pricing model is based on a per-square-mile basis. For security solutions, the pricing model is on a customized-site basis. As a result of the process for invoicing contracts and renewals upon execution, cash flows from operations and accounts receivable can fluctuate due to timing of contract execution and timing of deployment. Prior to the adoption of Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers ("Topic 606"), Revenue Recognition • Persuasive evidence of an arrangement exists • Delivery has occurred or services have been rendered • The sales price is fixed or determinable • Collection of the related receivable is reasonably assured Under ASC 605, the Company recognized subscription revenues ratably over the subscription period committed by the customer and commencing when the subscription service was fully operational and ready to go live, that is, upon completion of all deliverables stated in the signed customer acceptance form, assuming all other revenue recognition criteria were met. The Company recognized revenues from setup fees ratably based on the expected customer relationship period, typically over five years, which could extend beyond the initial contract period. In determining the expected customer relationship period, the Company considered specific customer details and renewal history with similar customers. If a customer declined to renew its subscription prior to the end of five years, then the remaining setup fees were immediately recognized. Effective January 1, 2018, after the adoption of Topic 606, the Company recognizes revenue upon the satisfaction of performance obligations. At contract inception, the Company assesses the services promised in its contracts with customers and identifies a performance obligation for each promise to transfer to the customer a good or service (or bundle of services) that is distinct. To identify the performance obligations, the Company considers all of the services promised in the contract regardless of whether they are explicitly stated or are implied by customary business practices. The Company determined that the subscription services, training, and licenses to integrate with third-party applications are each distinct services that represent separate performance obligations. The setup activities are not distinct from the subscription service and are combined into the subscription service performance obligation. However, setup fees may provide a material right to the customer that has influence over the customers' decision to renew. All setup fees are assessed on a quantitative and qualitative basis to determine whether they represent a distinct performance obligation. The total contract value is allocated to each performance obligation identified based on the standalone selling price of the service. Discounts are allocated pro-rata to the identified performance obligations. Revenues from subscription services are recognized ratably, on a straight-line basis, over the term of the subscription. Revenues from material rights are recognized ratably over the period in which they are determined to provide a material right to the customer, which is generally three years. Revenues from training and licenses to integrate with third-party applications are recognized upon delivery which generally occurs when the subscription service is operational and ready to go live and these amounts are immaterial. Subscription renewal fees are recognized ratably over the term of the renewal, which is typically one year. While most customers elect to renew their agreements, in some cases, they may not be able to obtain the proper approvals or funding to complete the renewal prior to expiration. For these customers, the Company stops recognizing subscription revenues at the end of the current contract term, even though services may continue to be provided for a period of time until the renewal process is completed. Once the renewal is complete, the Company recognizes subscription revenues for the period between the expiration of the term of the agreement and the completion of the renewal process in the month in which the renewal is executed. If a customer declines to renew its subscription prior to the end of three years, then the remaining fees from material rights, if any, are immediately recognized. As of January 1, 2018, upon the adoption of ASC 606, the Company had total short-term and long-term deferred revenue of $17.3 million. During the three months ended June 30, 2018, the Company recognized $6.4 million in revenue from the beginning deferred revenue balance and $2.3 million from new billings, and added $8.1 million to total short-term and long-term deferred revenue from new billings. During the six months ended June 30, 2018, the Company recognized $11.7 million in revenue from beginning deferred revenue of $18.1 million and $3.9 million from new billings, and added $15.8 million to total short-term and long-term deferred revenue from new billings. As of June 30, 2018, the Company has estimated remaining performance obligations for contractually committed revenues of $12.8 million, $14.8 million, $11.0 million, $7.6 million, and $600,000 that will be recognized during the remainder of the year ended December 31, 2018, and years ended December 31, 2019, 2020, 2021, and 2022 through 2024, respectively. The timing of revenue recognition includes estimates of go live dates for contracts not yet live. Contractually committed revenue includes deferred revenue as of June 30, 2018 and amounts under contract that will be invoiced after June 30, 2018. During the three months ended June 30, 2018, the Company recognized revenues of $8.7 million from customers in the United States and $0.2 million from a customer in South Africa. During the six months ended June 30, 2018, the Company recognized revenues of $15.3 million from customers in the United States and $0.5 million from a customer in South Africa. Topic 606 also requires the capitalization of certain incremental costs of obtaining a contract, which impacts the period in which the Company records sales commissions expense. Historically, the Company recognized sales commissions expense upfront. Under Topic 606, the Company is required to capitalize these expenses. As there are not commensurate commissions earned on renewals of the subscription services, the Company concluded that the capitalized commissions are related to subscription services provided under both the initial contract and renewal periods. Therefore, the amortization period for the capitalized commissions is the customer life, which is determined to be five years. As the capitalized commissions are related to subscription services that are transferred over the customer's life, the Company amortizes the capitalized commissions on a straight-line basis of five years. For commissions that are earned on renewal contracts with an original duration of one year or less, the Company uses the practical expedient applicable to such commissions and recognizes the commissions as expense instead of capitalizing.
Accounts Receivable, net	Accounts Receivable, net Accounts receivable consist of trade accounts receivables from the Company’s customers, net of allowance for doubtful accounts if deemed necessary. Accounts receivable may include unbilled amounts which are under contract but are not yet billable. Accounts receivables are recorded at the invoiced amount. The Company does not require collateral or other security for accounts receivable. The Company periodically evaluates the collectability of its accounts receivable and provides an allowance for potential credit losses based on the historical experience. At June 30, 2018 and December 31, 2017, the Company did not have an allowance for potential credit losses as there were no estimated credit losses.
Concentrations of Risk	Concentrations of Risk Credit Risk – Financial instruments that potentially subject the Company to concentration of credit risk consisted primarily of restricted cash, cash and cash equivalents and accounts receivable from trade customers. The Company maintains its cash deposits at two domestic financial institutions. The Company is exposed to credit risk in the event of default by a financial institution to the extent that cash and cash equivalents are in excess of the amount insured by the Federal Deposit Insurance Corporation. The Company generally places its cash and cash equivalents with high-credit quality financial institutions. To date, the Company has not experienced any losses on its cash and cash equivalents Concentration of Accounts Receivable –As of June 30, 2018, two customers accounted for 31% and 25% of the Company’s accounts receivable. Fluctuations in accounts receivable result from timing of the Company’s execution of contracts and collection of related payments. As of December 31, 2017, three customers accounted for 18%, 18% and 14% of the Company’s accounts receivable. Concentration of Revenues –For the three months ended June 30, 2018, two customers accounted for 24% and 14% of the Company’s total revenues. For the three months ended June 30, 2017, one customer accounted for 17% of the Company’s total revenues. For the six months ended June 30, 2018, two customers accounted for 22% and 16% of the Company’s total revenues. For the six months ended June 30, 2017, one customer accounted for 17% of the Company’s total revenues.
Accounting Pronouncements Recently Adopted	Accounting Pronouncements Recently Adopted Effective January 1, 2018, the Company adopted Topic 606. The impact from the adoption of Topic 606 was as follows: Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 As Reported Effect of Change Increase/ (Decrease) Amounts Without Adoption of Topic 606 As Reported Effect of Change Increase/ (Decrease) Amounts Without Adoption of Topic 606 Revenues $ 8,927 $ 69 $ 8,858 $ 15,834 $ 122 $ 15,712 Costs 3,950 — 3,950 7,258 — 7,258 Gross profit 4,977 69 4,908 8,576 122 8,454 Sales and marketing expense 2,195 (116 ) 2,311 3,749 (257 ) 4,006 Operating loss (297 ) (185 ) (482 ) (1,516 ) (379 ) (1,895 ) Net loss (369 ) (185 ) (554 ) (1,586 ) (379 ) (1,965 ) As of June 30, 2018 As Reported Effect of Change Increase/ (Decrease) Amounts Without Adoption of Topic 606 Assets Prepaid expenses and other current assets $ 1,704 $ 564 $ 1,140 Other assets 1,662 1,460 202 Total assets 39,825 2,024 37,801 Liabilities Deferred revenue, short term 16,230 515 15,715 Total current liabilities 22,089 515 21,574 Deferred revenue, long term 1,212 (1,182 ) 2,394 Total liabilities 23,392 (667 ) 24,059 In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments In October 2016, the FASB issued ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory In November 2016, the FASB issued ASU 2016-18, Restricted Cash In May 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting Compensation – Stock Compensation
Recent Accounting Pronouncements Not Yet Effective	Recent Accounting Pronouncements Not Yet Effective In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In July 2017, the FASB issued ASU 2017-11 , Earnings Per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), Derivatives and Hedging (Topic 815).
Employee Stock Purchase Plan	The Company accounts for employee stock purchases made under its 2017 ESPP using the estimate grant date fair value of accounting in accordance with ASC 718, Stock Compensation

Summary of Significant Accoun18

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2018
Adoption of Topic 606
Summary of Impact from Adoption of Topic 606	The impact from the adoption of Topic 606 was as follows: Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 As Reported Effect of Change Increase/ (Decrease) Amounts Without Adoption of Topic 606 As Reported Effect of Change Increase/ (Decrease) Amounts Without Adoption of Topic 606 Revenues $ 8,927 $ 69 $ 8,858 $ 15,834 $ 122 $ 15,712 Costs 3,950 — 3,950 7,258 — 7,258 Gross profit 4,977 69 4,908 8,576 122 8,454 Sales and marketing expense 2,195 (116 ) 2,311 3,749 (257 ) 4,006 Operating loss (297 ) (185 ) (482 ) (1,516 ) (379 ) (1,895 ) Net loss (369 ) (185 ) (554 ) (1,586 ) (379 ) (1,965 ) As of June 30, 2018 As Reported Effect of Change Increase/ (Decrease) Amounts Without Adoption of Topic 606 Assets Prepaid expenses and other current assets $ 1,704 $ 564 $ 1,140 Other assets 1,662 1,460 202 Total assets 39,825 2,024 37,801 Liabilities Deferred revenue, short term 16,230 515 15,715 Total current liabilities 22,089 515 21,574 Deferred revenue, long term 1,212 (1,182 ) 2,394 Total liabilities 23,392 (667 ) 24,059

Details of Certain Condensed 19

Details of Certain Condensed Consolidated Balance Sheet Accounts (Tables)	6 Months Ended
	Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets (in thousands): June 30, December 31, 2018 2017 Prepaid software and licenses $ 332 $ 407 Prepaid insurance 580 211 Other prepaid expenses 150 137 Deferred commissions 564 — Other 78 84 $ 1,704 $ 839
Schedule of Other Assets	Other assets (in thousands): June 30, December 31, 2018 2017 Deferred commissions $ 1,460 $ — Other 202 143 $ 1,662 $ 143
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities (in thousands): June 30, December 31, 2018 2017 Payroll liabilities $ 1,136 $ 1,697 Accrued employee paid time off 564 469 Accrued commissions 180 199 Accrued ESPP 91 115 Royalties payable 143 125 Professional fees 160 328 Use and other taxes 400 406 Other 453 476 $ 3,127 $ 3,815

Capital Stock (Tables)

Capital Stock (Tables)	6 Months Ended
	Jun. 30, 2018
Stockholders Equity Note [Abstract]
Schedule of Stock by Class	Immediately prior to the IPO, the Company had the following outstanding convertible preferred stock: Shares Authorized Shares Issued and Outstanding Aggregate Liquidation Preference (in thousands) Series B-1 4,773,000 3,848,023 $ 22,575 Series A-2 1,177,000 1,176,423 20,000 $ 42,575

Net Loss per Share (Tables)

Net Loss per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Summary of Computation of Basic and Diluted Net Loss per Share	The following table summarizes the computation of basic and diluted net loss per share (in thousands, except share and per share data): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Numerator: Net loss $ (369 ) $ (4,306 ) $ (1,586 ) $ (5,867 ) Denominator: Weighted-average shares outstanding, basic and diluted 10,589,038 3,724,760 10,329,874 2,678,787 Net loss per share $ (0.03 ) $ (1.16 ) $ (0.15 ) $ (2.19 )
Schedule of Anti-dilutive Shares Outstanding Excluded in Calculation of Diluted Net Loss per Share	The following potentially dilutive shares outstanding at the end of the periods presented were excluded in the calculation of diluted net loss per share as the effect would have been anti-dilutive: As of June 30, 2018 2017 Options to purchase common stock 828,822 1,303,336 Unvested restricted stock units 110,764 — Warrants to purchase Series B-1 convertible preferred or common stock 173,110 714,596 Total 1,112,696 2,017,932

Convertible Preferred Stock W22

Convertible Preferred Stock Warrants and Common Stock Warrants (Tables)	6 Months Ended
	Jun. 30, 2018
Warrants And Rights Note Disclosure [Abstract]
Schedule of Common Stock Warrants Issued and Outstanding	As of June 30, 2018, the Company had the following common stock warrants issued and outstanding (in thousands, except share and per share data): Warrant Class Shares Issuance Date Price per Share Expiration Date Common stock warrant 3,766 July 2012 $ 5.8667 July 2019 Common stock warrant 34,628 August 2012 $ 5.8667 August 2019 Common stock warrant 50,716 February 2014 $ 0.1700 February 2021 Common stock warrant (1) 84,000 June 2017 $ 13.2000 June 2020 173,110 (1 ) This warrant was issued to the Company’s lead underwriter in connection with the IPO.

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)	6 Months Ended
	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Stock Option Activity	A summary of option activities under the 2005 Plan and 2017 Plan during the six months ended June 30, 2018 is as follows: Number of Options Outstanding Weighted Average Exercise Price Outstanding as of December 31, 2017 1,294,128 $ 1.79 Granted 102,746 $ 28.80 Exercised (553,216 ) $ 0.81 Canceled (14,836 ) $ 4.11 Outstanding as of June 30, 2018 828,822 $ 5.75
Schedule of Stock-Based Compensation Expense Recorded in Condensed Consolidated Statements of Operations	Total stock-based compensation expense associated with the 2005 Plan, 2017 Plan and 2017 ESPP is recorded in the condensed consolidated statements of operations and was allocated as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Cost of revenues $ 75 $ 9 $ 132 $ 10 Sales and marketing 199 15 265 20 Research and development 68 9 108 16 General and administrative 306 19 570 29 Total $ 648 $ 52 $ 1,075 $ 75

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments Under Non-cancelable Operating Lease	The following is a schedule of future minimum lease payments under the non-cancelable operating lease at June 30, 2018 (in thousands): 2018 (remainder of year) $ 185 2019 352 2020 357 2021 304 2022 — Total $ 1,198

Organization and Description 25

Organization and Description of Business - Additional Information (Details)	Jun. 30, 2018Subsidiary
ShotSpotter (Pty) Ltd | South Africa
Business And Nature Of Operations [Line Items]
Number of subsidiary	1

Initial Public Offering - Addit

Initial Public Offering - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Initial Public Offering [Line Items]
Net proceeds from Initial public offering after underwriting discounts and commissions	$ 32,400			$ 32,426
Loss on remeasurement of convertible preferred stock warrant liability		$ 3,725		3,725
Reclassification of convertible preferred stock warrant liability into additional paid-in capital	$ 5,700			$ 5,711
Common Stock
Initial Public Offering [Line Items]
Conversion of preferred stock into common stock, shares	4,689,753		4,689,753
Additional Paid-in Capital
Initial Public Offering [Line Items]
Reclassification of convertible preferred stock warrant liability into additional paid-in capital	$ 42,100		$ 42,100
Offering cost incurred excluding underwriting commissions and discounts	$ 1,900
Other Expense, Net
Initial Public Offering [Line Items]
Loss on remeasurement of convertible preferred stock warrant liability			$ 3,700
Maximum
Initial Public Offering [Line Items]
Number of shares called by warrant	84,000	84,000		84,000
IPO
Initial Public Offering [Line Items]
Sale of stock, shares	3,220,000
Price per share	$ 11	$ 11		$ 11
IPO | Maximum
Initial Public Offering [Line Items]
Number of shares called by warrant	84,000	84,000		84,000

Summary of Significant Accoun27

Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018USD ($)Customershares	Jun. 30, 2017USD ($)Customer	Jun. 30, 2018USD ($)Customershares	Jun. 30, 2017USD ($)Customer	Dec. 31, 2017USD ($)Customer	Jan. 01, 2018USD ($)	Jun. 12, 2017shares	Mar. 27, 2017shares
Accounting Policies [Line Items]
Number of authorized shares of common stock | shares	500,000,000		500,000,000
Percentage of contract value invoiced to customer on contract fully executed			50.00%
Percentage of contract value invoiced to customer on subscription service operational and ready to go live			50.00%
Percentage of contract value invoiced subscription service renewals on renewal contract executed			100.00%
Deferred revenue	$ 18,100,000		$ 18,100,000
Deferred revenue added from new billings	8,100,000		15,800,000
Revenues	8,927,000	$ 5,836,000	15,834,000	$ 10,398,000
Allowance for potential credit losses	0		0		$ 0
Accumulated deficit	$ (96,156,000)		$ (96,156,000)		$ (97,595,000)
Customer Concentration Risk | Accounts Receivable
Accounting Policies [Line Items]
Number of customers | Customer			2		3
Customer Concentration Risk | Revenues
Accounting Policies [Line Items]
Number of customers | Customer	2	1	2	1
Customer One | Customer Concentration Risk | Accounts Receivable
Accounting Policies [Line Items]
Concentration risk percentage			31.00%		18.00%
Customer One | Customer Concentration Risk | Revenues
Accounting Policies [Line Items]
Concentration risk percentage	24.00%	17.00%	22.00%	17.00%
Customer Two | Customer Concentration Risk | Accounts Receivable
Accounting Policies [Line Items]
Concentration risk percentage			25.00%		18.00%
Customer Two | Customer Concentration Risk | Revenues
Accounting Policies [Line Items]
Concentration risk percentage	14.00%		16.00%
Customer Three | Customer Concentration Risk | Accounts Receivable
Accounting Policies [Line Items]
Concentration risk percentage					14.00%
United States
Accounting Policies [Line Items]
Revenues	$ 8,700,000		$ 15,300,000
South Africa
Accounting Policies [Line Items]
Revenues	200,000		500,000
Recognition from Beginning Deferred Revenue Balance
Accounting Policies [Line Items]
Deferred revenue recognized	6,400,000
Recognition from Beginning Deferred Revenue
Accounting Policies [Line Items]
Deferred revenue recognized			11,700,000
Recognition from New Billings of Deferred Revenue
Accounting Policies [Line Items]
Deferred revenue recognized	2,300,000		$ 3,900,000
Adoption of Topic 606
Accounting Policies [Line Items]
Revenues material right recognition period			3 years
Subscription renewal fees recognition period			1 year
Deferred revenue						$ 17,300,000
Capitalized commissions, amortization period			5 years
Adoption of Topic 606 | Effect of Change Increase/(Decrease)
Accounting Policies [Line Items]
Deferred revenue						(1,200,000)
Revenues	$ 69,000		$ 122,000
Accumulated deficit						3,000,000
Capitalization of commissions						$ 1,800,000
Minimum
Accounting Policies [Line Items]
Subscription services initial contract period			1 year
Maximum
Accounting Policies [Line Items]
Subscription services initial contract period			5 years
Expected customer relationship period			5 years
Amended and Restated Certificate of Incorporation
Accounting Policies [Line Items]
Number of authorized shares of common stock | shares							500,000,000	8,600,000
Total number of authorized shares | shares								14,550,000
Amended and Restated Certificate of Incorporation | Series A-2 Convertible Preferred Stock
Accounting Policies [Line Items]
Convertible preferred stock, terms of conversion			to provide, among other changes, that each share of Series A-2 convertible preferred stock would automatically convert into 0.715548 shares of common stock upon the consummation of an initial public offering of the Company’s capital stock.
Conversion of preferred stock into common stock | shares								0.715548

Summary of Significant Accoun28

Summary of Significant Accounting Policies - Estimated Remaining Performance Obligations - Additional Information (Details)	6 Months Ended
	Jun. 30, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Estimated remaining performance obligations for contractually committed revenues	$ 12,800,000
Estimated remaining performance obligations for contractually committed revenues recognition period	Remainder of the year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Estimated remaining performance obligations for contractually committed revenues	$ 14,800,000
Estimated remaining performance obligations for contractually committed revenues recognition period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Estimated remaining performance obligations for contractually committed revenues	$ 11,000,000
Estimated remaining performance obligations for contractually committed revenues recognition period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Estimated remaining performance obligations for contractually committed revenues	$ 7,600,000
Estimated remaining performance obligations for contractually committed revenues recognition period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Estimated remaining performance obligations for contractually committed revenues	$ 600,000
Estimated remaining performance obligations for contractually committed revenues recognition period	3 years

Summary of Significant Accoun29

Summary of Significant Accounting Policies - Summary of Impact from Adoption of Topic 606 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 8,927	$ 5,836	$ 15,834	$ 10,398
Costs	3,950	2,687	7,258	5,362
Gross profit	4,977	3,149	8,576	5,036
Sales and marketing	2,195	1,369	3,749	2,477
Operating loss	(297)	(119)	(1,516)	(1,304)
Net loss	(369)	$ (4,306)	(1,586)	$ (5,867)
Assets
Prepaid expenses and other current assets	1,704		1,704		$ 839
Other assets	1,662		1,662		143
Total assets	39,825		39,825		36,198
Liabilities
Deferred revenue, short-term	16,230		16,230		15,780
Total current liabilities	22,089		22,089		21,222
Deferred revenue, long-term	1,212		1,212		2,710
Total liabilities	23,392		23,392		$ 24,036
Adoption of Topic 606 | Effect of Change Increase/(Decrease)
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	69		122
Gross profit	69		122
Sales and marketing	(116)		(257)
Operating loss	(185)		(379)
Net loss	(185)		(379)
Assets
Prepaid expenses and other current assets	564		564
Other assets	1,460		1,460
Total assets	2,024		2,024
Liabilities
Deferred revenue, short-term	515		515
Total current liabilities	515		515
Deferred revenue, long-term	(1,182)		(1,182)
Total liabilities	(667)		(667)
Adoption of Topic 606 | Amounts Without Adoption of Topic 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	8,858		15,712
Costs	3,950		7,258
Gross profit	4,908		8,454
Sales and marketing	2,311		4,006
Operating loss	(482)		(1,895)
Net loss	(554)		(1,965)
Assets
Prepaid expenses and other current assets	1,140		1,140
Other assets	202		202
Total assets	37,801		37,801
Liabilities
Deferred revenue, short-term	15,715		15,715
Total current liabilities	21,574		21,574
Deferred revenue, long-term	2,394		2,394
Total liabilities	$ 24,059		$ 24,059

Details of Certain Condensed 30

Details of Certain Condensed Consolidated Balance Sheet Accounts - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Prepaid Expense And Other Assets Current [Abstract]
Prepaid software and licenses	$ 332	$ 407
Prepaid insurance	580	211
Other prepaid expenses	150	137
Deferred commissions	564
Other	78	84
Total	$ 1,704	$ 839

Details of Certain Condensed 31

Details of Certain Condensed Consolidated Balance Sheet Accounts - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other Assets Noncurrent Disclosure [Abstract]
Deferred commissions	$ 1,460
Other	202	$ 143
Total other assets	$ 1,662	$ 143

Details of Certain Condensed 32

Details of Certain Condensed Consolidated Balance Sheet Accounts - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accrued Expenses And Other Current Liabilities [Abstract]
Payroll liabilities	$ 1,136	$ 1,697
Accrued employee paid time off	564	469
Accrued commissions	180	199
Accrued ESPP	91	115
Royalties payable	143	125
Professional fees	160	328
Use and other taxes	400	406
Other	453	476
Accrued expenses and other current liabilities	$ 3,127	$ 3,815

Impairment of Property and Eq33

Impairment of Property and Equipment - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Impairment of property and equipment	$ 361	$ 361
Puerto Rico and the U S Virgin Islands
Property Plant And Equipment [Line Items]
Impairment of property and equipment			$ 800
Revenues related to contracts			$ 900

Capital Stock - Summary of Outs

Capital Stock - Summary of Outstanding Convertible Preferred Stock (Details) $ in Thousands	May 31, 2017USD ($)shares
Class Of Stock [Line Items]
Temporary equity, aggregate liquidation preference | $	$ 42,575
Series B-1 Convertible Preferred Stock
Class Of Stock [Line Items]
Temporary equity, shares authorized	4,773,000
Temporary equity, shares issued	3,848,023
Temporary equity, shares outstanding	3,848,023
Temporary equity, aggregate liquidation preference | $	$ 22,575
Series A-2 Convertible Preferred Stock
Class Of Stock [Line Items]
Temporary equity, shares authorized	1,177,000
Temporary equity, shares issued	1,176,423
Temporary equity, shares outstanding	1,176,423
Temporary equity, aggregate liquidation preference | $	$ 20,000

Capital Stock - Additional Info

Capital Stock - Additional Information (Details) - USD ($)	1 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Class Of Stock [Line Items]
Reclassification of convertible preferred stock warrant liability into additional paid-in capital	$ 5,700,000		$ 5,711,000
Preferred stock, shares outstanding		0
Common stock, shares authorized		500,000,000
Common stock, par value		$ 0.005
Common stock, voting rights		each outstanding share of common stock is entitled to one vote
Common stock, shares issued		10,759,719		9,827,129
Common stock, shares outstanding		10,759,719		9,827,129
Preferred stock, shares authorized		20,000,000
Preferred stock, par value		$ 0.005
Preferred stock, shares issued		0
Convertible Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares outstanding		0
Common Stock
Class Of Stock [Line Items]
Conversion of preferred stock into common stock, shares	4,689,753	4,689,753
Conversion of preferred stock into common stock, value		$ 23,000
Additional Paid-in Capital
Class Of Stock [Line Items]
Reclassification of convertible preferred stock warrant liability into additional paid-in capital	$ 42,100,000	$ 42,100,000

Net Loss per Share - Summary of

Net Loss per Share - Summary of Computation of Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net loss	$ (369)	$ (4,306)	$ (1,586)	$ (5,867)
Denominator:
Weighted-average shares outstanding, basic and diluted	10,589,038	3,724,760	10,329,874	2,678,787
Net loss per share	$ (0.03)	$ (1.16)	$ (0.15)	$ (2.19)

Net Loss per Share - Schedule o

Net Loss per Share - Schedule of Anti-dilutive Shares Outstanding Excluded in Calculation of Diluted Net Loss per Share (Details) - shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total	1,112,696	2,017,932
Options to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total	828,822	1,303,336
Unvested Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total	110,764
The March 2017 Preferred stock warrant or common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total	173,110	714,596

Convertible Preferred Stock W38

Convertible Preferred Stock Warrants and Common Stock Warrants - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Class Of Warrant Or Right [Line Items]
Loss on remeasurement of convertible preferred stock warrant liability		$ 3,725		$ 3,725
Reclassification of convertible preferred stock warrant liability into additional paid-in capital	$ 5,700			$ 5,711
Maximum
Class Of Warrant Or Right [Line Items]
Number of shares called by warrant	84,000	84,000		84,000
Other Expense, Net
Class Of Warrant Or Right [Line Items]
Loss on remeasurement of convertible preferred stock warrant liability			$ 3,700

Convertible Preferred Stock W39

Convertible Preferred Stock Warrants and Common Stock Warrants - Schedule of Common Stock Warrants Issued and Outstanding (Details)	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Class Of Warrant Or Right [Line Items]
Shares of warrants issued and outstanding	173,110
The July 2012 Common stock warrant
Class Of Warrant Or Right [Line Items]
Shares of warrants issued and outstanding	3,766
Issuance Date	2012-07
Price per Share | $ / shares	$ 5.8667
Expiration Date	2019-07
The August 2012 Common stock warrant
Class Of Warrant Or Right [Line Items]
Shares of warrants issued and outstanding	34,628
Issuance Date	2012-08
Price per Share | $ / shares	$ 5.8667
Expiration Date	2019-08
The November 2012 Common stock warrant
Class Of Warrant Or Right [Line Items]
Shares of warrants issued and outstanding	50,716
Issuance Date	2014-02
Price per Share | $ / shares	$ 0.1700
Expiration Date	2021-02
The February 2014 Common stock warrant
Class Of Warrant Or Right [Line Items]
Shares of warrants issued and outstanding	84,000	[1]
Issuance Date	2017-06	[1]
Price per Share | $ / shares	$ 13.2000	[1]
Expiration Date	2020-06	[1]
[1]	This warrant was issued to the Company’s lead underwriter in connection with the IPO.

Equity Incentive Plans - Additi

Equity Incentive Plans - Additional Information (Details)	Jan. 01, 2018shares	May 31, 2017shares	Jun. 30, 2018USD ($)Participant$ / sharesshares	Dec. 31, 2017
Restricted Stock Unit
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Units, Granted			92,883
Weighted average Grant Date Fair Value, Granted | $ / shares			$ 17.87
Restricted Stock Unit | Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Units, Granted			17,881
Weighted average Grant Date Fair Value, Granted | $ / shares			$ 28.45
Restricted Stock Unit | Vesting Rate, Year One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock units of common stock, vesting percentage			35.00%
Restricted Stock Unit | Vesting Rate, Year Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock units of common stock, vesting percentage			21.667%
Restricted Stock Unit | Vesting Rate, Year Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock units of common stock, vesting percentage			21.667%
Restricted Stock Unit | Vesting Rate, Year Four
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock units of common stock, vesting percentage			21.667%
2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance		2,413,659
Number of shares available for future grant		900,000	1,296,557
Shares of common stock reserved for issuance, automatic annual increase initiation date		Jan. 1, 2018
Shares of common stock reserved for issuance, automatic annual increase end date		Jan. 1, 2027
Percentage of number of shares of common stock outstanding				5.00%
Increase in common stock reserved for issuance	491,356
2017 Equity Incentive Plan | Shares under 2005 Plan that would have otherwise been returned to 2005 Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance		1,314,752
2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance			200,000
Number of shares available for future grant			150,000
Percentage of number of shares of common stock outstanding				2.00%
Increase in common stock reserved for issuance	150,000
Percentage of fair market value of common stock on purchase date		85.00%
Percentage of fair market value of common stock on purchase date of the first day of IPO		85.00%
Purchase of common stock under ESPP, Description			The 2017 ESPP allows eligible employees to purchase shares of the Company’s common stock in an offering at a discount of the then-current trading price, up to the lesser of (1) 85% of the fair market value of the common stock on the first day of the IPO or (2) 85% of the fair market value of the common stock on the purchase date. The 2017 ESPP permits the maximum discounted purchase price permitted under U.S. tax rules, including a “lookback.”
Initial offering period in length			24 months
Number of participant have the right to purchase shares of common stock | Participant			0
Fair Market Value Of Common Stock | $			$ 25,000
Shares issued under ESPP			43,624

Equity Incentive Plans - Schedu

Equity Incentive Plans - Schedule of Stock Option Activity (Details) - 2005 Plan and 2017 Plan	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Options Outstanding, Beginning Balance | shares	1,294,128
Number of Options Outstanding, Granted | shares	102,746
Number of Options Outstanding, Exercised | shares	(553,216)
Number of Options Outstanding, Canceled | shares	(14,836)
Number of Options Outstanding, Ending Balance | shares	828,822
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 1.79
Weighted Average Exercise Price, Granted | $ / shares	28.80
Weighted Average Exercise Price, Exercised | $ / shares	0.81
Weighted Average Exercise Price, Canceled | $ / shares	4.11
Weighted Average Exercise Price, Ending Balance | $ / shares	$ 5.75

Equity Incentive Plans - Sche42

Equity Incentive Plans - Schedule of Stock-Based Compensation Expense Recorded in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 648	$ 52	$ 1,075	$ 75
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	75	9	132	10
Sale and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	199	15	265	20
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	68	9	108	16
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 306	$ 19	$ 570	$ 29

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2007shares	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)
Commitments And Contingencies Disclosure [Line Items]
Non-cancelable operating lease expiration period				2,021
Rent expense		$ 0.1	$ 0.1	$ 0.2	$ 0.2
Lawsuit filing date				November 6, 2017
Claims description				The Contractors claim that our subsequent one-for-five and one-for-17 reverse stock splits should not apply to their option awards.
Reverse stock split, description				one-for-five and one-for-17 reverse stock splits
Damages sought value				$ 6.5
Minimum
Commitments And Contingencies Disclosure [Line Items]
Number of options granted | shares	250,000
Option One
Commitments And Contingencies Disclosure [Line Items]
Reverse stock split, conversion ratio				0.2
Option Two
Commitments And Contingencies Disclosure [Line Items]
Reverse stock split, conversion ratio				0.0588

Commitments and Contingencies44

Commitments and Contingencies - Schedule of Future Minimum Lease Payments Under Non-cancelable Operating Lease (Details) $ in Thousands	Jun. 30, 2018USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
2018 (remainder of year)	$ 185
2,019	352
2,020	357
2,021	304
Total	$ 1,198