Airgain (AIRG) 10-K 15 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Mar. 13, 2019	Jun. 29, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	AIRG
Entity Registrant Name	AIRGAIN INC
Entity Central Index Key	0001272842
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		10,029,281
Entity Public Float			$ 74.5
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Small Business	true
Entity Ex Transition Period	false

Balance Sheets

Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 13,620,656	$ 15,026,068
Short term investments	20,168,981	21,287,064
Trade accounts receivable	7,013,220	8,418,132
Inventory	1,351,104	741,557
Prepaid expenses and other current assets	931,254	609,786
Total current assets	43,085,215	46,082,607
Property and equipment, net	1,400,591	1,036,860
Goodwill	3,700,447	3,700,447
Customer relationships, net	3,592,918	4,075,918
Intangible assets, net	858,805	1,052,333
Other assets	269,136	349,743
Total assets	52,907,112	56,297,908
Current liabilities:
Accounts payable	4,136,943	3,969,083
Accrued bonus	2,640,406	2,224,517
Accrued liabilities	652,139	1,121,833
Deferred purchase price		1,000,000
Current portion of long-term notes payable		1,333,333
Current portion of deferred rent obligation under operating lease	81,332	81,332
Total current liabilities	7,510,820	9,730,098
Deferred tax liability	37,577	7,971
Deferred rent obligation under operating lease	211,383	334,860
Total liabilities	7,759,780	10,072,929
Stockholders’ equity:
Common shares, par value $0.0001, 200,000,000 shares authorized at December 31, 2018 and December 31, 2017; 9,958,448 and 9,616,992 shares issued at December 31, 2018 and December 31, 2017, respectively; 9,601,134 and 9,481,992 shares outstanding at December 31, 2018 and December 31, 2017, respectively	995	961
Additional paid in capital	93,583,069	89,907,766
Treasury stock, at cost: 357,314 and 135,000 shares at December 31, 2018 and December 31, 2017, respectively	(3,431,530)	(1,257,100)
Accumulated other comprehensive loss	(11,141)	(16,907)
Accumulated deficit	(44,994,061)	(42,409,741)
Total stockholders’ equity	45,147,332	46,224,979
Commitments and contingencies (note 13)
Total liabilities and stockholders’ equity	$ 52,907,112	$ 56,297,908

Balance Sheets (Parenthetical)

Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	9,958,448	9,616,992
Common stock, shares outstanding	9,601,134	9,481,992
Treasury stock, shares at cost	357,314	135,000

Statements of Operations

Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Sales	$ 60,625,212	$ 49,521,171	$ 43,433,867
Cost of goods sold	34,114,044	26,218,965	24,156,792
Gross profit	26,511,168	23,302,206	19,277,075
Operating expenses:
Research and development	9,319,116	7,319,575	5,622,132
Sales and marketing	11,032,752	7,012,829	5,670,625
General and administrative	9,545,306	8,000,602	4,532,151
Total operating expenses	29,897,174	22,333,006	15,824,908
Income (loss) from operations	(3,386,006)	969,200	3,452,167
Other (income) expense:
Interest income	(584,735)	(296,451)	(7,803)
Interest expense	30,988	98,711	178,371
Fair market value adjustment - warrants			(460,289)
Gain on deferred purchase price liability	(388,733)
Loss on disposal of fixed assets	39,251
Total other income	(903,229)	(197,740)	(289,721)
Income (loss) before income taxes	(2,482,777)	1,166,940	3,741,888
Provision for income taxes	101,543	25,685	8,181
Net income (loss)	(2,584,320)	1,141,255	3,733,707
Accretion of dividends on preferred convertible stock			(1,537,021)
Net income (loss) attributable to common stockholders	$ (2,584,320)	$ 1,141,255	$ 2,196,686
Net income (loss) per share:
Basic	$ (0.27)	$ 0.12	$ 0.65
Diluted	$ (0.27)	$ 0.11	$ 0.40
Weighted average shares used in calculating income (loss) per share
Basic	9,520,947	9,485,271	3,373,316
Diluted	9,520,947	10,361,373	4,667,503

Statement of Comprehensive Inco

Statement of Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (2,584,320)	$ 1,141,255	$ 3,733,707
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes	5,766	(16,907)
Total comprehensive income (loss)	$ (2,578,554)	$ 1,124,348	$ 3,733,707

Statements of Stockholders' Equ

Statements of Stockholders' Equity - USD ($)	Total	Preferred Convertible Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance at Dec. 31, 2015	$ (39,412,822)	$ 5,968,549	$ 1,094,375				$ (46,475,746)
Beginning balance, shares at Dec. 31, 2015		6,244,174	665,842
Stock-based compensation	298,535			$ 298,535
Conversion of warrants	249,215			249,215
Conversion of warrants, shares			127,143
Exercise of stock options	$ 137,403		$ 112,101	25,302
Exercise of stock options, shares	58,155		58,155
Effect of accretion to redemption value	$ (1,356,707)			(547,750)			(808,957)
Change in par value from no par value to $0.0001			$ (1,206,391)	1,206,391
Issuance of common stock upon initial public offering, net of issuance costs	10,816,978		$ 170	10,816,808
Issuance of common stock upon initial public offering, net of issuance costs, shares			1,700,100
Issuance of warrants to underwriters	126,218			126,218
Conversion of preferred redeemable convertible stock to common stock upon initial public offering	44,463,613		$ 378	44,463,235
Conversion of preferred redeemable convertible stock to common stock upon initial public offering, shares			3,778,753
Conversion of preferred convertible stock to common stock upon initial public offering		$ (5,968,549)	$ 126	5,968,423
Conversion of preferred convertible stock to common stock upon initial public offering, shares		(6,244,174)	1,259,187
Issuance of common stock upon secondary public offering, net of issuance costs	25,976,262		$ 169	25,976,093
Issuance of common stock upon secondary public offering, net of issuance costs, shares			1,685,882
Net income (loss)	3,733,707						3,733,707
Ending balance at Dec. 31, 2016	45,032,402		$ 928	88,582,470			(43,550,996)
Ending balance, shares at Dec. 31, 2016			9,275,062
Stock-based compensation	736,066			736,066
Exercise of stock options	$ 588,482		$ 28	588,454
Exercise of stock options, shares	284,455		284,455
Shares issued pursuant to stock awards			$ 5	(5)
Shares issued pursuant to stock awards, shares			57,475
Common stock repurchases	$ (1,257,100)				$ (1,257,100)
Common stock repurchases, shares			(135,000)
Reversal of costs related to secondary offering	781			781
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes	(16,907)					$ (16,907)
Net income (loss)	1,141,255						1,141,255
Ending balance at Dec. 31, 2017	46,224,979		$ 961	89,907,766	(1,257,100)	(16,907)	(42,409,741)
Ending balance, shares at Dec. 31, 2017			9,481,992
Stock-based compensation	2,910,070			2,910,070
Exercise of stock options	$ 765,267		$ 34	765,233
Exercise of stock options, shares	341,456		341,456
Common stock repurchases	$ (2,174,430)				(2,174,430)
Common stock repurchases, shares			(222,314)
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes	5,766					5,766
Net income (loss)	(2,584,320)						(2,584,320)
Ending balance at Dec. 31, 2018	$ 45,147,332		$ 995	$ 93,583,069	$ (3,431,530)	$ (11,141)	$ (44,994,061)
Ending balance, shares at Dec. 31, 2018			9,601,134

Statements of Stockholders' E_2

Statements of Stockholders' Equity (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Stockholders Equity [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001	$ 0.0001

Statements of Cash Flows

Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ (2,584,320)	$ 1,141,255	$ 3,733,707
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	586,884	436,247	495,347
Amortization	676,528	581,386	373,350
Fair market value adjustment - warrants			(460,289)
Amortization of discounts on investments, net	(201,587)	(91,485)
Stock-based compensation	2,910,070	736,066	298,535
Deferred Tax Liability	29,606	1,805	6,166
Loss on disposal of fixed assets	39,251
Gain on deferred purchase price liability	(388,733)
Changes in operating assets and liabilities:
Trade accounts receivable	1,042,843	(2,678,746)	(1,422,998)
Inventory	(609,547)	(161,972)	(27,082)
Prepaid expenses and other assets	(240,861)	(525,919)	(120,567)
Accounts payable	293,662	(101,801)	1,075,534
Accrued bonus	415,889	475,966	413,051
Accrued liabilities	(469,694)	49,591	411,255
Deferred obligation under operating lease	(123,477)	(117,049)	(106,732)
Net cash provided by (used in) operating activities	1,376,514	(254,656)	4,669,277
Cash flows from investing activities:
Purchases of available-for-sale securities	(29,666,317)	(21,962,486)
Maturities of available-for-sale securities	30,991,753	750,000
Cash paid for acquisition		(6,348,730)
Purchases of property and equipment	(989,866)	(263,063)	(275,649)
Net cash provided by (used in) investing activities	335,570	(27,824,279)	(275,649)
Cash flows from financing activities:
Repayment of notes payable	(1,333,333)	(1,388,563)	(1,624,999)
Proceeds from initial public offering and issuance of warrants to underwriters			13,600,800
Costs related to initial public offering		781	(2,657,604)
Proceeds from secondary public offering			26,797,094
Costs related to secondary public offering			(820,832)
Payments on acquisition related deferred purchase price	(375,000)
Common stock repurchases	(2,174,430)	(1,257,100)
Proceeds from exercise of stock options	765,267	588,482	137,403
Net cash provided by (used in) financing activities	(3,117,496)	(2,056,400)	35,431,862
Net increase (decrease) in cash and cash equivalents	(1,405,412)	(30,135,335)	39,825,490
Cash and cash equivalents, beginning of period	15,026,068	45,161,403	5,335,913
Cash and cash equivalents, end of period	13,620,656	15,026,068	45,161,403
Supplemental disclosure of cash flow information
Interest paid	36,667	98,711	177,460
Taxes paid	$ 46,198	$ 102,819
Supplemental disclosure of non-cash investing and financing activities:
Accretion of Series E, F, and G preferred redeemable convertible stock to redemption amount			1,356,707
Conversion of warrants			249,215
Conversion of preferred stock into common stock			$ 50,432,162

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Significant Accounting Policies	(1) Significant Accounting Policies (a) Description of Business Airgain, Inc. (the Company) was incorporated in the State of California on March 20, 1995 and reincorporated in the State of Delaware on August 15, 2016. The Company is a leading provider of advanced antenna technologies used to enable high performance wireless networking across a broad range of devices and markets, including Consumer, Enterprise and Automotive. The Company designs, develops, and engineers its antenna products for original equipment and design manufacturers worldwide. The Company’s headquarters is in San Diego, California with office space and research, design and test facilities in the United States, United Kingdom, Korea, China and Taiwan. (b) Basis of Presentation The financial statements of the Company have been prepared in conformity with U.S. generally accepted accounting principles (GAAP). (c) Recently Issued Accounting Pronouncements In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2018-15, Intangibles – Goodwill and Other – Internal-Use Software In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement: Disclosure Framework – Changes to Disclosure for Fair Value Measurement In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ( d ) Segment Information The Company’s operations are located primarily in the United States, and most of its assets are located in San Diego, California and Scottsdale, Arizona. The Company operates in one segment related to the sale of antenna products. The Company’s chief operating decision-maker is its chief executive officer, who reviews operating results on an aggregate basis and manages the Company’s operations as a single operating segment. ( e ) Cash Equivalents and Short-Term Investments Cash equivalents are comprised of short-term, highly liquid investments with maturities of 90 days or less at the date of purchase. Short-term investments consist predominantly of commercial paper, corporate debt securities, U.S. Treasury securities and asset backed securities. The Company classifies short-term investments based on the facts and circumstances surrounding the investments at the time of purchase and evaluates such classification as of each balance sheet date. All short-term investments are classified as available-for-sale securities as of December 31, 2018 and are recorded at estimated fair value. Unrealized gains and losses for available-for-sale securities are included in accumulated other comprehensive income, a component of stockholders’ equity. Realized gains and losses are included in other income, in the statement of operations. The Company evaluates its investments to determine whether those with unrealized loss positions are other than temporarily impaired. Impairments are considered to be other than temporary if they are related to deterioration in credit risk or if it is likely that the Company will sell the securities before recovery of their cost basis. ( f ) Trade Accounts Receivable Trade accounts receivable is adjusted for all known uncollectible accounts. The policy for determining when receivables are past due or delinquent is based on the contractual terms agreed upon. Accounts are written off once all collection efforts have been exhausted. An allowance for doubtful accounts is established when, in the opinion of management, collection of the account is doubtful. The allowance for doubtful accounts was $0 as of December 31, 2018 and December 31, 2017. ( g ) Inventory The majority of the Company’s products are manufactured by third parties that retain ownership of the inventory until title is transferred to the customer at the shipping point. In certain instances, shipping terms are delivery at place and the Company is responsible for arranging transportation and delivery of goods ready for unloading at the named place. The Company bears all risk involved in bringing the goods to the named place and records the related inventory in transit to the customer as inventory on the accompanying balance sheet. With the acquisition of substantially all of the assets of Antenna Plus, LLC (Antenna Plus), in April 2017, the Company began manufacturing products at its Scottsdale, Arizona and Shullsburg, Wisconsin locations. In July 2017, the Company relocated all of its product manufacturing operations in Shullsburg, Wisconsin to the Scottsdale, Arizona facility. See Note 4 for additional information relating to the Company’s acquisition of the Antenna Plus assets. Inventory is stated at the lower of cost or net realizable value. For items manufactured by the Company, cost is determined using the weighted average cost method. For items manufactured by third parties, cost is determined using the first-in, first-out method (FIFO). Any adjustments to reduce the cost of inventories to their net realizable value are recognized in earnings in the current period. As of December 31, 2018, the Company’s inventories consist primarily of raw materials. Provisions for excess and obsolete inventories are estimated based on product life cycles, quality issues, and historical experience. As of December 31, 2018 and December 31, 2017, there was no provision for excess and obsolete inventories. ( h ) Property and Equipment Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, generally three years. The estimated useful lives for leasehold improvements is determined as either the estimated useful life of the asset or the lease term, whichever is shorter. Depreciation of assets that are recorded under operating leases are included in depreciation expense. Maintenance and repairs are expensed as incurred. Property and equipment are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. When assets are sold, or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts and any gain or loss is included as a non-operating expense. ( i ) Goodwill Goodwill, which has an indefinite useful life, represents the excess of cost over fair value of net assets acquired. The change in the carrying value of goodwill during the year ended December 31, 2017, was due to an acquisition during 2017. See Note 5. The Company reviews goodwill for impairment annually on December 1st and whenever events or changes in circumstances indicate that goodwill may be impaired. The Company completed its annual assessment for goodwill impairment in December 2018 and determined that goodwill is not impaired as of December 31, 2018. ( j ) Long-lived Assets The Company’s identifiable intangible assets are comprised of acquired developed technologies, customer relationships, tradenames and non-compete agreements. The cost of the identifiable intangible assets with finite lives is amortized on a straight-line basis over the assets’ respective estimated useful lives. The Company periodically re-evaluates the original assumptions and rationale utilized in the establishment of the carrying value and estimated lives of long-lived assets and finite-lived intangible assets. Long- lived assets and finite-lived intangibles are assessed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If an asset is considered to be impaired, the impairment recognized is equal to the amount by which the carrying value of the asset exceeds its fair value. ( k ) Revenue Recognition The Company generates revenue primarily from the sale of its antenna products. The Company recognizes revenue when products are shipped and the customer takes ownership and assumes risk of loss, collection of the relevant receivable is reasonably assured, persuasive evidence of an arrangement exists, and the sales price is fixed or determinable. Title and risk of loss transfer to customers either when the products are shipped to or received by the customer, based on the terms of the specific agreement with the customer. A portion of the Company’s sales are made through distributors under agreements allowing for pricing credits and/or rights of return under certain circumstances. Pricing credits and returns under these provisions have been insignificant; accordingly, the Company’s allowance for sales returns and pricing credits was insignificant for the years ended December 31, 2018, 2017 and 2016. To date, services revenues have been immaterial as a percentage of total revenues. Service revenues are recognized ratably over the term of the agreement. ( l ) Shipping and Transportation Costs Shipping and other transportation costs are expensed as incurred. Shipping and other transportation costs were $433,234, $462,297 and $321,093 for the years ended December 31, 2018, 2017 and 2016, respectively. These costs are included in general and administrative expenses in the accompanying statements of operations. ( m ) Research and Development Costs Costs incurred in connection with research and development are expensed as incurred. (n) Advertising Costs Advertising costs are expensed as incurred and included in sales and marketing expenses. Advertising costs were $2,525,626, $15,867 and $0, for the years ended December 31, 2018, 2017 and 2016, respectively. ( o ) Income Taxes The Company records income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statements carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. When applicable, a valuation allowance is established to reduce any deferred tax asset when it is determined that it is more likely than not that some portion of the deferred tax asset will not be realized. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company records interest related to unrecognized tax benefits in interest expense and penalties in general and administrative expenses. ( p ) Stock-Based Compensation The Company recognizes all employee stock-based compensation as a cost in the financial statements. Equity classified awards are measured at the grant-date fair value of the award. The Company estimates the grant-date fair value using the Black-Scholes-Merton option-pricing model. The Company recognizes forfeitures when incurred. Compensation cost is recognized on a straight-line basis over the requisite service period for the entire award. Stock-based compensation expense for the years ended December 31, 2018, 2017 and 2016 was $2,910,070, $736,066 and $298,535, respectively. ( q ) Fair Value Measurements The carrying values of the Company’s financial instruments, including cash, trade accounts receivable, accounts payable, and accrued liabilities approximate their fair values due to the short maturity of these instruments. Fair value measurements are market-based measurements, not entity-specific measurements. Therefore, fair value measurements are determined based on the assumptions that market participants would use in pricing the asset or liability. The Company follows a three-level hierarchy to prioritize the inputs used in the valuation techniques to derive fair values. The basis for fair value measurements for each level within the hierarchy is described below: • Level 1: Quoted prices in active markets for identical assets or liabilities. • Level 2: Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets. • Level 3: Valuations derived from valuation techniques in which one or more significant inputs are unobservable in active markets. ( r ) Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant items subject to such estimates and assumptions include valuation of the preferred redeemable convertible stock warrant liability, stock- based compensation and intangible assets. ( s ) Accumulated Other Comprehensive Loss Comprehensive income (loss) is comprised of net income (loss) and other comprehensive income (loss). Accumulated other comprehensive loss on the balance sheet at December 31, 2018 and December 31, 2017 includes unrealized gains and losses on the Company’s available-for-sale securities. ( t ) Net Income (Loss) Per Share Basic net income (loss) per share is calculated by dividing net income (loss) available to common stockholders by the weighted average shares of common stock outstanding for the period. Diluted net income (loss) per share is calculated by dividing net income (loss) by the weighted average shares of common stock outstanding for the period plus amounts representing the dilutive effect of securities that are convertible into common stock. Preferred dividends are deducted from net income (loss) in arriving at net income (loss) attributable to common stockholders. The Company calculates diluted earnings (loss) per common share using the treasury stock method and the as-if-converted method, as applicable. The following table presents the computation of net income or loss per share: For the Year Ended December 31, 2018 2017 2016 Numerator: Net income (loss) $ (2,584,320 ) $ 1,141,255 $ 3,733,707 Accretion of dividends on preferred stock — — (1,537,021 ) Net income (loss) attributable to common stockholders - basic $ (2,584,320 ) $ 1,141,255 $ 2,196,686 Accretion of dividends on preferred stock — — 125,205 Adjustment for change in fair value of warrant liability — — (460,289 ) Net income (loss) attributable to common stockholders - diluted $ (2,584,320 ) $ 1,141,255 $ 1,861,602 Denominator: Weighted average common shares outstanding Basic 9,520,947 9,485,271 3,373,316 Diluted 9,520,947 10,361,373 4,667,503 Net income (loss) per share: Basic $ (0.27 ) $ 0.12 $ 0.65 Diluted $ (0.27 ) $ 0.11 $ 0.40 Basic and diluted weighted average common shares outstanding for the year ended December 31, 2018 were the same. Diluted weighted average common shares outstanding for the year ended December 31, 2017 includes 1,532 warrants and 874,571 options outstanding. Diluted weighted average common shares outstanding for the year ended December 31, 2016 includes 577,529 options outstanding and 716,658 preferred shares. Potentially dilutive securities not included in the calculation of diluted net income (loss) per share because to do so would be anti-dilutive are as follows (in common stock equivalent shares): For the Year Ended December 31, 2018 2017 2016 Preferred redeemable convertible stock, including accumulated dividends — — 2,406,894 Employee stock options 978,464 513,869 — Warrants outstanding 51,003 — 51,003 Total 1,029,467 513,869 2,457,897

Cash, Cash Equivalents and Shor

Cash, Cash Equivalents and Short-Term Investments	12 Months Ended
	Dec. 31, 2018
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents and Short-Term Investments	( 2 ) Cash, Cash Equivalents and Short-Term Investments The following table shows the Company’s cash and cash equivalents and short-term investments by significant investment category as of December 31, 2018: December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Cash and Cash Equivalents Short-Term Investments Cash $ 3,043,800 $ — $ — $ 3,043,800 $ 3,043,800 $ — Level 1 (1): Money market funds 5,481,647 — — 5,481,647 5,481,647 — U.S. treasury securities 1,987,794 — (164 ) 1,987,630 — 1,987,630 Subtotal 7,469,441 — (164 ) 7,469,277 5,481,647 1,987,630 Level 2 (2): Commercial paper 10,639,390 — — 10,639,390 2,094,983 8,544,407 Corporate debt obligations 5,963,913 — (6,678 ) 5,957,235 — 5,957,235 Repurchase agreements 3,000,226 — — 3,000,226 3,000,226 — Asset-backed securities 3,682,413 250 (2,954 ) 3,679,709 — 3,679,709 Subtotal 23,285,942 250 (9,632 ) 23,276,560 5,095,209 18,181,351 Total $ 33,799,183 $ 250 $ (9,796 ) $ 33,789,637 $ 13,620,656 $ 20,168,981 December 31, 2017 Amortized Cost Gross Unrealized Losses Estimated Fair Value Cash and Cash Equivalents Short-Term Investments Long-Term Marketable Securities Cash $ 3,040,696 $ — $ 3,040,696 $ 3,040,696 $ — $ — Level 1 (1): Money market funds 8,234,751 — 8,234,751 8,234,751 — — U.S. treasury securities 2,490,799 (5,540 ) 2,485,259 — 2,485,259 — Subtotal 10,725,550 (5,540 ) 10,720,010 8,234,751 2,485,259 — Level 2 (2): Commercial paper 9,716,093 — 9,716,093 — 9,716,093 — Corporate debt obligations 6,829,191 (9,414 ) 6,819,777 — 6,819,777 — Repurchase agreements 3,000,233 — 3,000,233 3,000,233 — — Asset-backed securities 3,018,276 (1,953 ) 3,016,323 750,388 2,265,935 — Subtotal 22,563,793 (11,367 ) 22,552,426 3,750,621 18,801,805 — Total $ 36,330,039 $ (16,907 ) $ 36,313,132 $ 15,026,068 $ 21,287,064 $ — (1) Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities. (2) Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company’s investments were primarily valued based upon one or more valuations reported by its investment accounting and reporting service provider. The investment service provider values the securities using a hierarchical security pricing models that relies primarily on valuations provided by a third-party pricing vendor. Such valuations may be based on trade prices in active markets for identical assets or liabilities (Level 1 inputs) or valuation models using inputs that are observable either directly or indirectly (Level 2 inputs), such as quoted prices for similar assets or liabilities, yield curve, volatility factors, credit spreads, default rates, loss severity, current market and contractual prices for underlying instruments or debt, broker and dealer quotes, as well as other relevant economic measures. The Company performs certain procedures to corroborate the fair value of its holdings, including comparing valuations obtained from its investment service provider with other pricing sources to validate the reasonableness of the valuations. The Company typically invests in highly-rated securities, and its investment policy limits the amount of credit exposure to any one issuer. The policy requires investments in fixed income instruments denominated and payable in U.S. dollars only and requires investments to be investment grade, with a primary objective of minimizing the potential risk of principal loss. The following table presents the Company’s short-term investments with unrealized losses by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2018: Less Than 12 Months Description of Securities Estimated Fair Value Unrealized Losses December 31, 2018 U.S. treasury securities $ 1,987,630 $ (164 ) Corporate debt obligations 5,957,235 (6,678 ) Asset-backed securities 3,031,912 (2,954 ) Total $ 10,976,777 $ (9,796 ) The Company considers the declines in market value of its short-term investments to be temporary in nature. Fair values were determined for each individual security in the investment portfolio. When evaluating an investment for other-than-temporary impairment, the Company reviews factors such as length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, changes in market interest rates and the Company’s intent to sell, or whether it is more likely than not it will be required to sell the investment before recovery of the investment’s cost basis. As of December 31, 2018, the Company does not consider any of its investments to be other-than temporarily impaired. Contractual maturities of short-term investments as of December 31, 2018 are as follows: Estimated Fair Value Due within one year $ 20,168,981 Total $ 20,168,981

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Property and Equipment	(3) Property and Equipment Depreciation and amortization of property and equipment is calculated on the straight-line method based on estimated useful lives of six to ten years for tenant improvements and three to five years for all other property and equipment. Property and equipment consist of the following: As of December 31, 2018 2017 Lab equipment $ 2,503,086 $ 1,914,911 Computer equipment 113,248 169,366 Computer software 193,694 299,227 Furniture and fixtures 266,960 202,218 Tenant improvements 894,304 763,898 Other office equipment 126,099 63,825 4,097,391 3,413,445 Less accumulated depreciation (2,696,800 ) (2,376,585 ) $ 1,400,591 $ 1,036,860 Depreciation expense was $586,884, $436,247 and $495,347 for the years ended December 31, 2018, 2017 and 2016, respectively. For the year ended December 31, 2018, the Company incurred a $39,251 loss on disposal of fixed assets.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Acquisitions	(4) Acquisitions Antenna Plus On April 27, 2017, the Company completed the acquisition of substantially all of the assets of Antenna Plus. Antenna Plus is a supplier of antenna-based solutions for mobile and automotive fleet applications for government, public safety, and industrial Internet of Things (IOT) markets. The acquisition provides leverage for the Company’s existing products into several new markets, including the fast-growing automotive fleet and industrial IOT space. The transaction was completed pursuant to an Asset Purchase Agreement with MCA Financial Group, Ltd., acting as the court-appointed receiver for Antenna Plus. Upon the closing of the transaction, the Company paid to Antenna Plus total consideration of approximately $6.3 million in cash, net of post-closing working capital adjustments. In addition, the Company assumed certain contracts and other liabilities of Antenna Plus, as expressly set forth in the Asset Purchase Agreement. The following table shows the allocation of the purchase price for Antenna Plus to the acquired identifiable assets, liabilities assumed and goodwill: Consideration: Cash $ 6,383,500 Working capital adjustments (34,770 ) Fair value of total consideration transferred $ 6,348,730 Recognized amounts of identifiable assets acquired and liabilities assumed: Accounts receivable $ 584,390 Inventory 432,770 Fixed assets 402,958 Intangible assets 2,600,000 Current liabilities (121,879 ) Total identifiable net assets acquired 3,898,239 Goodwill 2,450,491 Total $ 6,348,730 Goodwill was primarily attributable to the anticipated synergies and economies of scale expected from the operations of the combined business. The synergies include certain cost savings, operating efficiencies, and other strategic benefits projected to be achieved as a result of the acquisition. Goodwill is expected to be deductible for tax purposes. Sales associated with the acquired Antenna Plus assets since the date of acquisition was $5.2 million for the year ended December 31, 2017. Cost of goods sold associated with the acquired Antenna Plus assets since the date of acquisition was $2.3 million for the year ended December 31, 2017. Net income associated with the acquired Antenna Plus assets since the date of acquisition was $0.4 million for the year ended December 31, 2017. Unaudited Pro Forma Information The following unaudited pro forma financial information presents combined results of operations for each of the periods presented, as if Antenna Plus had been acquired as of the beginning of the fiscal year 2016. The pro forma information includes adjustments to amortization and depreciation for intangible assets and property, plant and equipment acquired. The pro forma data are for informational purposes only and are not necessarily indicative of the consolidated results of operations of the combined business had the acquisition actually occurred at the beginning of fiscal year 2016 or of the results of future operations of the combined business. Consequently, actual results will differ from the unaudited pro forma information presented below: For the Year Ended December 31, 2017 2016 Pro forma sales $ 51,789,215 $ 50,940,773 Pro forma income from operations $ 1,539,538 $ 4,436,281 Pro forma net income $ 1,711,598 $ 4,717,872 Skycross On December 17, 2015, the Company executed and entered into an asset purchase agreement for certain North American assets of Skycross, Inc. (Skycross), a manufacturer of advanced antenna and radio-frequency solutions. In addition to the $4.0 million paid up front, the purchase price also included a contingent consideration arrangement. The $1.0 million of contingent consideration is payable upon the later of (i) the expiration of the Transition Services Agreement between the Company and Skycross which defined transition services to be provided by Skycross to the Company and (ii) the date on which the Company received copies of third party approvals with respect to each customer and program that was purchased. The potential undiscounted amount of all future payments that could be required to be paid under the contingent consideration arrangement was between zero and $1.0 million. The fair value of the contingent consideration was estimated by applying the income approach. The income approach is based on estimating the value of the present worth of future net cash flows. During the year ended December 31, 2018, the Company and Skycross came to an agreement that the Company would pay Skycross $375,000 to settle all outstanding balances between the parties, which included $1.0 million of deferred purchase price, $125,802 due to Skycross and $362,069 of accounts receivable from Skycross. The settlement with Skycross resulted in the recognition of a gain on deferred purchase price liability of $388,733 during the year ended December 31, 2018.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	( 5 ) Goodwill Changes to the Company’s goodwill balance during the year ended December 31, 2018 and 2017 are as follows: Balance at December 31, 2016 $ 1,249,956 Current period adjustments 2,450,491 Balance at December 31, 2017 $ 3,700,447 Current period adjustments — Balance at December 31, 2018 $ 3,700,447

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	( 6 ) Intangible Assets The following is a summary of the Company’s acquired intangible assets: As of December 31, 2018 Weighted Average Amortization Period (years) Gross Carrying Amount Accumulated Amortization Intangibles, Net Customer relationships 10 $ 4,830,000 $ 1,237,082 $ 3,592,918 Developed technologies 9 1,080,000 274,528 805,472 Tradename 3 120,000 66,667 53,333 Non-compete agreement 3 67,000 67,000 — Total intangible assets, net 10 $ 6,097,000 $ 1,645,277 $ 4,451,723 As of December 31, 2017 Weighted Average Amortization Period (years) Gross Carrying Amount Accumulated Amortization Intangibles, Net Customer relationships 10 $ 4,830,000 $ 754,082 $ 4,075,918 Developed technologies 9 1,080,000 142,477 937,523 Tradename 3 120,000 26,667 93,333 Non-compete agreement 3 67,000 45,523 21,477 Total intangible assets, net 10 $ 6,097,000 $ 968,749 $ 5,128,251 The estimated annual amortization of intangible assets for the next five years and thereafter is shown in the following table. Actual amortization expense to be reported in future periods could differ from these estimates as a result of acquisitions, divestitures, asset impairments, among other factors. Estimated Future Amortization 2019 655,052 2020 628,385 2021 597,701 2022 563,000 2023 563,000 Thereafter 1,444,585 Total $ 4,451,723 Amortization expense was $676,528, $581,386 and $373,350 for the years ended December 31, 2018, 2017 and 2016, respectively.

Long-term Notes Payable (includ

Long-term Notes Payable (including current portion) and Line of Credit	12 Months Ended
	Dec. 31, 2018
Long Term Debt [Abstract]
Long-term Notes Payable (including current portion) and Line of Credit	( 7 ) Long-term Notes Payable (including current portion) and Line of Credit In December 2013, the Company amended its revolving line of credit under the amended and restated loan and security with Silicon Valley Bank to include a growth capital term loan of up to $750,000. The growth capital term loan required interest only payments through June 30, 2014 at which point it was to be repaid in 32 equal monthly installments of interest and principal. The growth capital term loan matured on February 1, 2017, at which time $55,230 in principal and accrued interest was paid. The growth capital term loan interest rate was 6.5%. As of December 31, 2018 there was no balance owed under this loan. In December 2015, the Company further amended its amended and restated loan and security agreement with Silicon Valley Bank to include a term loan in the amount of $4.0 million. The loan required 36 monthly installments of interest and principal. The loan matured on December 1, 2018. Effective September 2017, the Company further amended its amended and restated loan and security agreement with Silicon Valley Bank to update the financial covenants. The amended and restated loan and security agreement requires the Company to maintain, at all times, measured as of the last day of each month (unless otherwise specified) either (i) a minimum cash balance of unrestricted cash at Silicon Valley Bank or its affiliate of not less than $25.0 million or (ii) a liquidity ratio of 1.25 to 1.00 and a minimum EBITDA, measured as of the last day of each fiscal quarter for the previous six month period (for December 31, 2018 the minimum EBITDA is 750,000). The interest rate is fixed at 5%. In January 2018, the Company entered into a second amended and restated loan and security agreement (the Amended Loan Agreement) with Silicon Valley Bank. The Amended Loan Agreement modified the amended and restated loan and security agreement to, among other things, increase the aggregate principal amount available under the revolving line of credit from $3.0 million to $10.0 million and modify certain existing financial covenants. There was no balance owed on the line of credit as of December 31, 2018. Under the Amended Loan Agreement, the Company may borrow up to $10.0 million under the line of credit, subject to a borrowing base limit of 80% of the aggregate face amount of all eligible receivables. The Amended Loan Agreement removed the minimum EBITDA requirement previously applicable to the line of credit and term loan and maintained the liquidity ratio financial covenant such that the Company must maintain a ratio of cash and cash equivalents plus accounts receivable outstanding debt under the Amended Loan Agreement minus deferred revenue of 1.25 to 1.00. The Company will be required to pay interest on borrowings outstanding, if any, under the revolving line of credit at a floating rate per annum equal to 1% above the Wall Street Journal prime rate (5.25% as of December 31, 2018) (or, if unavailable, the Silicon Valley Bank prime rate) on a monthly basis, so long as the Company maintains a liquidity ratio of cash and cash equivalents plus accounts receivable to outstanding debt under the Amended Loan Agreement minus deferred revenue of 1.50 to 1.00. If this liquidity ratio is not met, the Company will be subject to a minimum interest charge of $3,000 per month and borrowings outstanding, if any, under the revolving line of credit will accrue interest at a floating rate per annum equal to 2% above the Wall Street Journal prime rate (5.25% as of December 31, 2018) (or, if unavailable the Silicon Valley Bank prime rate) on a monthly basis. Prior to the amendment in January 2018, the revolving line of credit bore interest rate at the U.S. prime rate plus 1.25%. The revolving line of credit matures on January 31, 2020. Silicon Valley Bank maintains a first security interest over the Company’s assets, excluding intellectual property, for which Silicon Valley Bank has received a negative pledge. The Amended Loan Agreement contains customary affirmative and negative covenants and events of default applicable to the Company and any of its subsidiaries. As of December 31, 2018 and 2017, $0 and $1,333,333 was outstanding under the $4.0 million term loan, respectively. The Company was in compliance with all financial term loan and revolving line of credit financial covenants as of December 31, 2018 and 2017.

Treasury Stock

Treasury Stock	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Treasury Stock	(8) Treasury Stock In August 2017, the Company’s Board of Directors approved a share repurchase program pursuant to which the Company may purchase up to $7 million of shares of its common stock over the twelve month period following the establishment of the program. The repurchases under the share repurchase program are made from time to time in the open market or in privately negotiated transactions and are funded from the Company’s working capital. Repurchases will be made in compliance with Rule 10b-18 of the Securities Exchange Act of 1934, as amended, subject to market conditions, available liquidity, cash flow, applicable legal requirements and other factors. All shares of common stock repurchased under the Company’s share repurchase program will be returned to the status of authorized but unissued shares of common stock. On August 7, 2018, the Board approved an extension to the existing share repurchase program for an additional twelve month period ending August 14, 2019. In the year ended December 31, 2017, the Company has repurchased an aggregate of 135,000 share of common stock under the repurchase program at an average price per share of $9.40, for a total cost of $1,257,100. In the year ended December 31, 2018, the Company further repurchased additional 222,314 shares of common stock under the repurchase program. These shares were repurchased at an average price per share of $9.92, for a total cost of $2,174,430. As of December 31, 2018, the Company has repurchased an aggregate of 357,314 shares of common stock under the repurchase program at an average price per share of $9.60, for a total cost of $3,431,530.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	( 9 ) Income Taxes (a) Income Taxes The December 31, 2018, 2017 and 2016 income tax provision is as follows: For the Year Ended December 31, 2018 2017 2016 Current: U.S. federal $ 67,632 $ 21,272 $ — State and local 5,902 2,608 2,015 Total current provision 73,534 23,880 2,015 Deferred: U.S. federal 23,137 483 6,124 State and local 4,872 1,322 42 Total deferred provision 28,009 1,805 6,166 Total tax provision $ 101,543 $ 25,685 $ 8,181 (b) Tax Rate Reconciliation A reconciliation of the total income tax provision tax rate to the statutory federal income tax rate of 21%, 34% and 34% for the years ended December 31, 2018, 2017 and 2016, respectively, is as follows: For the Year Ended December 31, 2018 2017 2016 Income taxes at statutory rates $ (521,383 ) $ 396,760 $ 1,272,242 State income tax, net of federal benefit 10,774 3,910 2,054 Permanent items 17,771 (5,060 ) 68,944 Meals and entertainment 46,983 74,755 54,375 Equity based compensation (99,007 ) (645,512 ) 48,385 Warrant liability — — (156,498 ) Corporate tax rate change - impact on deferred income taxes — 2,768,458 — Research and development credit (195,336 ) 206,801 (141,494 ) Federal NOL adjustment — (386,441 ) (206,133 ) Federal return to provision (167,755 ) 53,265 11,104 Other federal credits — 112,262 — Other 64,196 15,695 — Change in federal valuation allowance 945,300 (2,569,208 ) (944,798 ) $ 101,543 $ 25,685 $ 8,181 (c) Significant Components of Current and Deferred Taxes The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2018 and 2017 are as follows: For the Year Ended December 31, 2018 2017 Deferred tax assets: Net operating loss carryforwards $ 4,924,181 $ 4,584,606 Capitalization of patent costs, goodwill and amortization 247,239 221,593 Capitalization of acquisition costs 81,088 84,640 Research and AMT credits 2,074,363 1,447,479 Stock based compensation 326,755 82,085 Deferred lease obligation 63,946 91,017 Accrued bonuses 198,102 — Other timing differences 60,773 72,787 7,976,447 6,584,207 Less valuation allowance (7,658,670 ) (6,453,466 ) Total deferred tax assets, net of allowance $ 317,777 $ 130,741 Deferred tax liabilities: Fixed assets (192,673 ) (104,324 ) Goodwill (162,681 ) (34,388 ) Total deferred tax liabilities $ (355,354 ) $ (138,712 ) Total deferred tax liabilities $ (37,577 ) $ (7,971 ) The Company has established a valuation allowance against its net deferred tax assets due to the uncertainty surrounding the realization of such assets. The Company periodically evaluates the recoverability of the deferred tax assets. At such time it is determined that it is more likely than not that deferred assets are realizable, the valuation allowance will be reduced. The Company has recorded a valuation allowance of $7,658,670 as of December 31, 2018 as it does not believe it is more likely than not that certain deferred tax assets will be realized due to the recent history of both pre-tax book income and losses, the lack of taxable income available in carryback periods or feasible tax-planning strategies, the limited existing taxable temporary differences, and the subjective nature of forecasting future taxable income into the future. The Company increased its valuation allowance by approximately $1,205,204 during the year ended December 31, 2018. At December 31, 2018, the Company had federal and California tax loss carryforwards of approximately $20,710,625, and $5,759,329, respectively. The federal loss generated in 2018 of $1,836,983 will carryforward indefinitely and be available to offset up to 80% of future taxable income each year. The remaining federal and state net operating loss carry forwards begin to expire in 2020 and 2028, respectively, if unused. At December 31, 2018, the Company had federal and state tax credit carry forwards of approximately $1,360,917, and $1,409,318, respectively, after reduction for uncertain tax positions. The federal credits will begin to expire in 2026, if unused, and the state credits carry forward indefinitely. Pursuant to the Internal Revenue Code of 1986, as amended (IRC), specifically IRC §382 and IRC §383, the Company’s ability to use net operating loss and research and development tax credit carry forwards (“tax attribute carry forwards”) to offset future taxable income is limited if the Company experiences a cumulative change in ownership of more than 50% within a three-year testing period. The Company has not completed an ownership change analysis pursuant to IRC Section 382 for taxable years ended after December 31, 2012. If ownership changes within the meaning of IRC Section 382 are identified as having occurred subsequent to 2012, the amount of remaining tax attribute carry forwards available to offset future taxable income and income tax expense in future years may be significantly restricted or eliminated. Further, the Company’s deferred tax assets associated with such tax attributes could be significantly reduced upon realization of an ownership change within the meaning of IRC §382. In December 2017, the Tax Cuts and Jobs Act (the 2017 Tax Act) was enacted. The 2017 Tax Act includes a number of changes to existing U.S. tax laws that impact the Company, most notably a reduction of the U.S. corporate income tax rate from 35 percent to 21 percent for tax years beginning December 31, 2018. The 2017 Tax Act also provides for the acceleration of depreciation for certain assets placed in service after September 27, 2017 as well as prospective changes beginning in 2018, including additional limitations on the deductibility of executive compensation, limitations on the deductibility of interest and capitalization of research and development expenditures. The following table summarizes the reconciliation of the unrecognized tax benefits activity during the years ended December 31, 2018 and 2017: For the Year Ended December 31, 2018 2017 Beginning unrecognized tax benefits $ 710,000 $ 1,532,000 Decreases related to prior year tax positions (65,000 ) (1,001,000 ) Increases related to current year tax positions 87,000 179,000 Ending unrecognized tax benefits $ 732,000 $ 710,000 The unrecognized tax benefit amounts are reflected in the determination of the Company’s deferred tax assets. If recognized, $9,040 of these amounts would impact company’s effective tax rate. The Company does not foresee material changes to its uncertain tax benefits within the next twelve months. The Company’s policy is to recognize interest and/or penalties related to income tax matters in income tax expense. The Company has an accrual for interest or penalties of $2,051 and $785 on the Company’s balance sheets as of December 31, 2018 and 2017, respectively, and has recognized interest and/or penalties in the Statement of Operations for the year ended December 31, 2018, 2017 and 2016, in the amount of $1,266, $785 and $0, respectively. Due to the existence of federal and state net operating loss and credit carryovers, the Company’s tax years that remain open and subject to examination by tax jurisdiction are years 2000 and forward for federal and years 2006 and forward for the state of California.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2018
Class Of Stock Disclosures [Abstract]
Stockholders' Equity	( 10 ) Stockholders’ Equity (a) Preferred Convertible Stock In June 2000, the Company sold 313,500 shares of Series A preferred convertible stock (Series A Preferred Stock) at $3.84 per share for gross proceeds of $1.2 million. In March 2001, the Company sold 290,993 shares of Series B preferred convertible stock (Series B Preferred Stock) at $4.39 per share for gross proceeds of $1.3 million in cash. At various times during 2003 the company issued a total of 866,613 additional shares of Series B Preferred Stock for cash and as compensation for services received and to satisfy debt obligations totaling approximately $1.2 million. In September 2003, the Company sold 682,000 shares of Series C preferred convertible stock (Series C Preferred Stock) at $1.00 per share for gross proceeds of $0.7 million. In November 2003, the Company sold 4,091,068 shares of Series D Preferred Convertible Stock (Series D Preferred Stock) at $0.542 per share for gross proceeds of $2.2 million. The holders of the Series A, B, C and D Preferred Stock (collectively, Junior Preferred Stock), were entitled to receive cumulative dividends at a rate of $0.0488, $0.00, $0.00 and $0.0488 per share, per annum, respectively, and were payable upon liquidation, redemption or conversion in order of their preference prior to any dividends on common stock. The holders of the Junior Preferred Stock were entitled to receive liquidation preferences upon certain deemed liquidation events at the rate equal to their purchase price per share plus all accrued and unpaid dividends. Upon completion of this distribution, any remaining assets were distributed to the holders of the common stock and to holders of the Junior Preferred Stock and to the holders of the Series E, F, and G Preferred Stock (collectively, Senior Preferred Stock) (on an as converted basis) until all amounts received by the holders of the Series A Preferred Stock were equal to $19.20 per share, the Series D Preferred Stock were equal to $2.168 per share, Series E Preferred Stock were equal to $4.44 per share, Series F Preferred Stock were equal to $5.20 per share, and Series G Preferred Stock were equal to $5.20 per share, the remaining assets were distributed among holders of shares of the common stock. The holders of the Senior Preferred Stock had priority and were made in preference to any payments to the Junior Preferred Stock up to the Senior Preferred Stock’s liquidation preference. The holders of the Junior Preferred Stock had priority and were made in preference to any payments to the holders of the common stock up to the Junior Preferred Stock’s liquidation preference. After distribution of both the Senior Preferred Stock and Junior Preferred Stock’s liquidation preferences, any remaining assets of the Company were distributed to the holders of the common stock. Each share of Junior Preferred Stock was convertible, at the option of the holder, at any time, into a number of shares of common stock at a conversion price of $21.70, $24.23, $8.59, $5.42 for the Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock and Series D Preferred Stock, respectively, subject to adjustments for stock dividends, combinations, subdivisions, reclassifications and reorganizations. Each share of Junior Preferred Stock was automatically convertible into commo n As long as 1,678,450 shares of Junior Preferred Stock remained outstanding, the Company was prohibited from certain transactions without the consent of at least 50% of the then outstanding shares of Junior Preferred Stock or the majority of the Board of Directors. The holders of the Junior Preferred Stock were entitled to the number of votes equal to the number of shares of common stock into which such shares of preferred stock could be converted and had voting rights and powers equal to the voting rights and powers of the common stock. In connection with the completion of the Company’s initial public offering (IPO), all 6,244,174 outstanding shares of the Company’s preferred convertible stock automatically converted into an aggregate of 753,611 shares of common stock. In addition, the Company issued 505,576 shares of its common stock in satisfaction of accumulated dividends on such preferred stock as the completion of the IPO. ( b ) Shares Reserved for Future Issuance The following common stock is reserved for future issuance at December 31, 2018 and 2017 : As of December 31, 2018 2017 Warrants issued and outstanding 51,003 51,003 Stock option awards issued and outstanding 1,407,049 1,203,627 Authorized for grants under the 2016 Equity Incentive Plan 463,491 633,052 Authorized for grants under the 2016 Employee Stock Purchase Plan 100,000 100,000 2,021,543 1,987,682 (1) Treasury stock in the amount of 357,314 and 135,000 as of December 31, 2018 and 2017, respectively, are excluded from the table above.

Preferred Redeemable Convertibl

Preferred Redeemable Convertible Stock	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Preferred Redeemable Convertible Stock	(11) Preferred Redeemable Convertible Stock In June 2005 and February 2006, the Company sold a total of 7,984,727 shares of Series E Preferred Redeemable Convertible Stock (Series E Preferred Stock) at $1.11 per share for gross proceeds of $8.8 million in cash. In February 2007, the Company sold 4,734,374 shares of Series F Preferred Redeemable Convertible Stock (Series F Preferred Stock) at $1.30 per share for gross proceeds of $6.2 million in cash. In March 2008 and June 2009, the Company completed an offering of Series G Preferred Stock at $1.30 per share for gross proceeds of $4.3 million in cash. In June 2012, the then outstanding convertible promissory notes and accrued interest thereon in the amount of $7.1 million converted to 6,216,607 and 463,856 shares of Series G Preferred Stock at the conversion price of $1.04 or $1.30 per share, respectively. The holders of the Senior Preferred Stock were entitled to receive cumulative dividends at a rate of 8% of the original purchase price, per annum and were payable in cash or common shares, at the option of the Company upon liquidation, redemption or conversion in order of their preference prior to any dividends on common stock or Junior Preferred Stock. The holders of the Senior Preferred Stock were entitled to receive liquidation preferences upon certain deemed liquidation events at the rate equal to their conversion price per share plus all accrued and unpaid dividends. Each share of Senior Preferred Stock was convertible, at the option of the holder, at any time, into a number of shares of common stock at a conversion price of $11.11, $13.00, and $13.00 for the Series E Preferred Stock, Series F Preferred Stock, and Series G Preferred Stock, respectively, subject to adjustments for stock dividends, combinations, subdivisions, reclassifications and reorganizations. Each share of Senior Preferred Stock was automatically convertible into common stock immediately upon the earlier of (i) the Company’s sale of its common stock in a firm commitment, underwritten public offering registered under the Securities Act of 1933, as amended, in which aggregate proceeds to the Company are at least $15.0 million, and at a per share offering price of at least $76.80 per share, as adjusted for any stock dividends, combinations, reclassifications, recapitalizations or splits, or (ii) the date specified by written consent or agreement by the holders of the majority of the then outstanding shares voting together as a single class, provided that the Junior Preferred Stock will also concurrently convert. As long as 4,875,000 shares of Senior Preferred Stock remained outstanding, the Company was prohibited from certain transactions without the consent of at least 50% of the then outstanding shares of Senior Preferred Stock or the majority of the Board of Directors. The holders of the Senior Preferred Stock were entitled to the number of votes equal to the number of shares of common stock into which such shares of preferred stock could be converted and have voting rights and powers equal to the voting rights and powers of the common stock. The following table provides a rollforward of the preferred redeemable convertible stock during the year ended December 31, 2016: Preferred redeemable convertible stock Shares Amount Balance at December 31, 2015 23,271,702 $ 43,106,906 Effect of accretion to redemption value — 1,356,707 Conversion of preferred redeemable convertible stock into common stock (23,271,702 ) (44,463,613 ) Balance at December 31, 2016 — $ — In connection with the completion of the IPO, all 23,271,702 outstanding shares of the Company’s preferred redeemable convertible stock automatically converted to 2,327,122 shares of common stock. In addition, the Company issued 1,451,631 shares of its common stock in satisfaction of accumulated dividends on such preferred stock as of the completion of the IPO. There was no preferred redeemable convertible stock activity in the year ended December 31, 2017.

Stock Options

Stock Options	12 Months Ended
	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Options	(1 2 ) Stock Options In August 2016, the Company’s board of directors adopted the 2016 Equity Incentive Plan (the 2016 Plan) for employees, directors, and consultants. As of December 31, 2018, 463,491 shares are available for issuance under the 2016 Plan, of which no shares were rolled from the 2013 Equity Incentive Plan (the 2013 Plan) into the 2016 Plan. In 2013, the Company’s board of directors adopted the 2013 Plan for employees, directors, and consultants. The common stock authorized under the 2013 Plan is 1,200,000 shares. Under the Plan, the administrator shall have authority to determine which service providers will receive awards, to grant awards and to set all terms and conditions of awards (including, but not limited to, vesting, exercise and forfeiture provisions). Vested options are canceled 90 days after termination of employment and become available for reissuance under the Plan. As of December 31, 2018 and December 31, 2017, no shares were available for issuance under the 2013 Plan. The service period for stock options granted to employees is generally 1 to 4 years. The grant-date fair value of each option award is estimated on the date of grant using the Black- Scholes-Merton option-pricing model. The weighted average assumptions for grants during the years ended December 31, 2018, 2017 and 2016 are provided in the following table. The Company’s lack of historical share option exercise experience does not provide it a reasonable basis upon which to estimate an expected term because of a lack of sufficient data. Therefore, the Company estimates the expected term by using the simplified method, which calculates the expected term as the average of the time-to-vesting and the contractual life of the options. Since the Company’s shares have only been publicly traded since August 12, 2016 and its shares were rarely traded privately, expected volatility is estimated based on the average historical volatility of similar entities with publicly traded shares in addition to the average historical volatility of the Company. The risk-free rate for the expected term of the option is based on the U.S. Treasury yield curve at the date of grant. As of December 31, 2018 2017 2016 Valuation assumptions: Expected dividend yield 0 % 0 % 0 % Expected volatility 37.60 % 39.37 % 41.82 % Expected term (years) 5.86 6.06 6.07 Risk-free interest rate 2.6 % 1.9 % 1.6 % Stock option activity during the periods indicated is as follows: Number of shares Weighted average exercise price Weighted average remaining contractual term Balance at December 31, 2015 756,692 $ 2.10 7.6 Granted 359,319 2.60 9.4 Exercised (58,155 ) 2.36 3.5 Expired/Forfeited (17,469 ) 2.13 2.6 Balance at December 31, 2016 1,040,387 $ 2.25 7.8 Granted 471,144 14.72 9.1 Exercised (284,455 ) 2.07 5.2 Expired/Forfeited (23,449 ) 8.22 — Balance at December 31, 2017 1,203,627 $ 7.06 8.1 Granted 1,009,134 9.94 6.8 Exercised (341,456 ) 2.24 1.3 Expired/Forfeited (464,256 ) 11.81 — Balance at December 31, 2018 1,407,049 $ 8.73 8.1 Vested and exercisable at December 31, 2018 504,287 $ 6.28 7.0 Vested and expected to vest at December 31, 2018 1,407,049 $ 8.73 8.1 The weighted average grant-date fair value of options granted during the years ended December 31, 2018, 2017 and 2016 was $3.97, $6.02 and $1.23, respectively. For fully vested stock options the aggregate intrinsic value was $2,485,258, $3,596,624 and $7,770,086 as of December 31, 2018, 2017 and 2016, respectively. For stock options expected to vest the aggregate intrinsic value was $993,372, $1,469,154 and $4,569,243 as of December 31, 2018, 2017 and 2016, respectively. The total grant date fair value of shares vested during the years ended December 31, 2018, 2017 and 2016 was $2,770,008, $322,804 and $176,597, respectively. During the year ended December 31, 2018, a total of 3,962 restricted stock units with a fair value of $12.62 per share were issued to a member of the Company’s Board of Directors of which the shares vest equally on each of the anniversaries over a three-year period. During the year ended December 31, 2016, a total of 57,475 shares of restricted common stock with a fair value of $2.00 per share were issued to the Company’s Chief Financial Officer and Chief Operating Officer of which 100% of the shares vested in the year ended December 31, 2017. At December 31, 2018, 2017 and 2016, there was $2,781,062, $2,453,342 and $522,818, respectively, of total unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans. That cost is expected to be recognized over the next three years. The Company currently uses authorized and unissued shares to satisfy share award exercises.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	(1 3 ) Commitments and Contingencies (a) Operating Leases The Company has entered into lease agreements for office space and research facilities in San Diego, California; Melbourne, Florida; Scottsdale, Arizona; Taipei, Taiwan; Shenzhen and Jiangsu, China; and Cambridge, United Kingdom. Rent expense was $911,887, $805,271 and $742,829, for the years ended December 31, 2018, 2017 and 2016, respectively. The longest lease expires in February 2022. The Company moved into its facility in San Diego, California during the year ended December 31, 2014. The San Diego facility lease agreement included a tenant improvement allowance which provided for the landlord to pay for tenant improvements on behalf of the Company up to $515,000. Based on the terms of this landlord incentive and involvement of the Company in the construction process, the leasehold improvements purchased under the landlord incentive were determined to be property of the Company. The future minimum lease payments required under operating leases in effect at December 31, 2018 were as follows: Year ending: 2019 $ 933,886 2020 560,432 2021 180,423 2022 22,526 $ 1,697,267 (b) Indemnification In some agreements to which the Company is a party, the Company has agreed to indemnify the other party for certain matters, including, but not limited to, product liability and intellectual property. To date, there have been no known events or circumstances that have resulted in any material costs related to these indemnification provisions and no liabilities have been recorded in the accompanying financial statements. (c) Employment Agreements During 2014, the Company entered into employment agreements with its Chief Executive Officer and certain members of its management team. These agreements provided severance in the aggregate amount of $575,000 for termination without cause as defined in the agreements. In April 2018, $150,000 in severance was paid out to the Company’s former Chief Operating Officer, Glenn Selbo. In May 2018, $507,200 in severance was paid out to the Company’s former Chief Executive Officer, Charles Myers. On January 16, 2019, the Company entered into amended and restated employment agreements with Jacob Suen, the Company’s President, Anil Doradla, the Company’s Chief Financial Officer and Secretary, and Kevin Thill, the Company’s Senior Vice President, Engineering. The amended and restated employment agreements provide for an indefinite term and for at-will employment. The agreements also set forth each executive’s annual base salary and target bonus opportunity and provide that each executive will be entitled to the benefits provided to employees generally. Pursuant to the amended and restated employment agreements, severance in the aggregate amount in excess of $455,000 for termination without cause is provided. On March 13, 2019, the Company entered into an employment agreement with James K. Sims, the Company’s Chairman and Chief Executive Officer. The agreement provides for an indefinite term and for at-will employment. The agreement also sets forth Mr. Sim’s annual base salary and target bonus opportunity and provides that he will be entitled to the benefits provided to employees generally. Pursuant to the agreement, Mr. Sims is eligible for severance in excess of $200,000.

Concentration of Credit Risk

Concentration of Credit Risk	12 Months Ended
	Dec. 31, 2018
Risks And Uncertainties [Abstract]
Concentration of Credit Risk	(1 4 ) Concentration of Credit Risk (a) Concentration of Sales and Accounts Receivable The following represents customers that accounted for 10% or more of total revenue during the years ended December 31, 2018, 2017 and 2016 and customers that accounted for 10% or more of total trade accounts receivable at December 31, 2018 and 2017: For the Year Ended December 31, 2018 2017 2016 Percentage of net revenue Customer A 36 % 21 % 20 % Customer B 8 % 13 % 31 % Customer C 7 % 10 % 8 % As of December 31, 2018 2017 Percentage of gross trade accounts receivable Customer A 32 % 13 % Customer B 14 % 4 % Customer C 14 % 9 % Customer D 8 % 10 % Customer E (1) — 19 % (1) For the year ended December 31, 2018, Customer E was moved under a distributer and is included in the balance for Customer A. (b) Revenue by Geography Net revenue by geographic area are as follows. Revenue is attributed by geographic location based on the bill-to location of the Company’s customers. For the Year Ended December 31, 2018 2017 2016 Percentage of net revenue China 75 % 67 % 74 % Other Asia 5 10 11 North America 16 18 10 Europe 4 5 5 Although the Company ships the majority of antennas to its customers in China (primarily ODMs and distributors), the end-users of the Company’s products are much more geographically diverse. (c) Concentration of Purchases During the year ended December 31, 2018, all of the Company’s products were manufactured in our Scottsdale, Arizona facilities and by two vendors in China. During the year ended December 31, 2017 all of the Company’s products were manufactured in our Shullsburg, Wisconsin and Scottsdale, Arizona facilities and by two vendors in China. Manufacturing completed in our Shullsburg, Wisconsin facility was transferred to the Scottsdale, Arizona facility once the facility was closed in July 2017. During the year ended December 31, 2016, all of the Company’s products were manufactured by two vendors in China.

Termination Costs

Termination Costs	12 Months Ended
	Dec. 31, 2018
Restructuring And Related Activities [Abstract]
Termination Costs	(1 5 ) Termination Costs On June 30, 2018, the Company terminated a marketing-related agreement to better align its sales and marketing efforts with its longer-term growth objectives and near-to-immediate term profitability goals. In consideration of terminating the agreement, the Company paid $1.3 million in termination costs. The termination costs were included in sales and marketing expense on the statement of operations for the year ended December 31, 2018. On May 2, 2018, Charles Myers, the Company’s Chief Executive Officer, President and member of the Board resigned from all positions with the Company, effective immediately, to pursue other opportunities. The Board accepted Mr. Myers resignation on May 2, 2018. Mr. Myer’s decision to resign was not related to a disagreement with the Company over any of its operations, policies, or practices. In connection with his resignation, Mr. Myers, upon a general release of claims as set forth in his employment agreement, received a lump sum cash payment in the amount of $484,000; a lump sum cash payment in the amount $3,200 covering twelve months of monthly premiums for disability insurance under the Company’s disability insurance plan; a lump sum cash payment in the amount of $20,000 covering certain other employment benefits; the acceleration of all his unvested options for a total of 282,944 shares and the continuation of his health coverage pursuant to COBRA at the Company’s expense for a period of twelve months following his last day of employment. In connection with Mr. Myers’ resignation, the Company recognized stock compensation expense of $1.2 million for the year ended December 31, 2018. Mr. Myers’ costs were included in general and administrative expense on the statement of operations for the year ended December 31, 2018. As of December 31, 2018, the remaining amount payable to Mr. Myers is $12,875. On April 2, 2018, Glenn Selbo, the Company’s Chief Operating Officer, resigned from his position with the Company. Following his resignation, Mr. Selbo will be providing consulting services to the Company. Mr. Selbo’s outstanding stock options continue to vest during the term of his consulting services. In connection with his resignation, Mr. Selbo, upon a general release of claims as set forth in his employment agreement, received a lump sum cash payment in the amount of $150,000 and the continuation of his health coverage pursuant to COBRA at the Company’s expense for a period of six months following his last day of employment. In connection with Mr. Selbo’s resignation, the Company recognized stock compensation expense of $44,267. Mr. Selbo’s costs were included in sales and marketing expense on the statement of operations for the year ended December 31, 2018. As of December 31, 2018, there are no further amounts owed to Mr. Selbo.

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2018
Postemployment Benefits [Abstract]
Employee Benefit Plan	(1 6 ) Employee Benefit Plan The Company established a discretionary 401(k) plan effective January 2005. The 401(k) plan was amended and restated in May 2006. The 401(k) plan covers substantially all employees who have attained age 21. The participants may elect to defer a percentage of their compensation as allowable by law. The Company can make discretionary matching contributions, but so far has not done so.

Quarterly Financial Information

Quarterly Financial Information (unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (unaudited)	(1 7 ) Quarterly Financial Information (unaudited) The following is a summary of the quarterly results of operations for the years ended December 31, 2018 and 2017: For the Three Months Ended December 31, 2018 September 30, 2018 June 30, 2018 March 31, 2018 Sales $ 16,561,520 $ 15,786,913 $ 14,971,681 $ 13,305,098 Gross Profit 6,850,134 6,865,342 6,601,521 6,194,171 Total operating expenses 5,730,406 6,558,122 10,250,807 7,357,840 Net income (loss) 1,274,559 437,259 (3,190,347 ) (1,105,791 ) Basic net income (loss) per share $ 0.13 $ 0.05 $ (0.34 ) $ (0.12 ) Diluted net income (loss) per share $ 0.13 $ 0.04 $ (0.34 ) $ (0.12 ) For the Three Months Ended December 31, 2017 September 30, 2017 June 30,      March 31, 2017 Sales $ 12,807,175 $ 12,448,436 $ 13,013,143 $ 11,252,417 Gross Profit 5,888,332 6,003,892 6,121,524 5,288,458 Total operating expenses 5,418,089 5,803,260 6,248,678 4,862,979 Net income (loss) 591,933 234,353 (70,121 ) 385,090 Basic net loss per share $ 0.06 $ 0.02 $ (0.01 ) $ 0.04 Diluted net loss per share $ 0.06 $ 0.02 $ (0.01 ) $ 0.04

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Description of Business	(a) Description of Business Airgain, Inc. (the Company) was incorporated in the State of California on March 20, 1995 and reincorporated in the State of Delaware on August 15, 2016. The Company is a leading provider of advanced antenna technologies used to enable high performance wireless networking across a broad range of devices and markets, including Consumer, Enterprise and Automotive. The Company designs, develops, and engineers its antenna products for original equipment and design manufacturers worldwide. The Company’s headquarters is in San Diego, California with office space and research, design and test facilities in the United States, United Kingdom, Korea, China and Taiwan.
Basis of Presentation	(b) Basis of Presentation The financial statements of the Company have been prepared in conformity with U.S. generally accepted accounting principles (GAAP).
Recently Issued Accounting Pronouncements	(c) Recently Issued Accounting Pronouncements In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2018-15, Intangibles – Goodwill and Other – Internal-Use Software In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement: Disclosure Framework – Changes to Disclosure for Fair Value Measurement In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842)
Segment Information	( d ) Segment Information The Company’s operations are located primarily in the United States, and most of its assets are located in San Diego, California and Scottsdale, Arizona. The Company operates in one segment related to the sale of antenna products. The Company’s chief operating decision-maker is its chief executive officer, who reviews operating results on an aggregate basis and manages the Company’s operations as a single operating segment.
Cash Equivalents and Short Term Investments	( e ) Cash Equivalents and Short-Term Investments Cash equivalents are comprised of short-term, highly liquid investments with maturities of 90 days or less at the date of purchase. Short-term investments consist predominantly of commercial paper, corporate debt securities, U.S. Treasury securities and asset backed securities. The Company classifies short-term investments based on the facts and circumstances surrounding the investments at the time of purchase and evaluates such classification as of each balance sheet date. All short-term investments are classified as available-for-sale securities as of December 31, 2018 and are recorded at estimated fair value. Unrealized gains and losses for available-for-sale securities are included in accumulated other comprehensive income, a component of stockholders’ equity. Realized gains and losses are included in other income, in the statement of operations. The Company evaluates its investments to determine whether those with unrealized loss positions are other than temporarily impaired. Impairments are considered to be other than temporary if they are related to deterioration in credit risk or if it is likely that the Company will sell the securities before recovery of their cost basis.
Trade Accounts Receivable	( f ) Trade Accounts Receivable Trade accounts receivable is adjusted for all known uncollectible accounts. The policy for determining when receivables are past due or delinquent is based on the contractual terms agreed upon. Accounts are written off once all collection efforts have been exhausted. An allowance for doubtful accounts is established when, in the opinion of management, collection of the account is doubtful. The allowance for doubtful accounts was $0 as of December 31, 2018 and December 31, 2017.
Inventory	( g ) Inventory The majority of the Company’s products are manufactured by third parties that retain ownership of the inventory until title is transferred to the customer at the shipping point. In certain instances, shipping terms are delivery at place and the Company is responsible for arranging transportation and delivery of goods ready for unloading at the named place. The Company bears all risk involved in bringing the goods to the named place and records the related inventory in transit to the customer as inventory on the accompanying balance sheet. With the acquisition of substantially all of the assets of Antenna Plus, LLC (Antenna Plus), in April 2017, the Company began manufacturing products at its Scottsdale, Arizona and Shullsburg, Wisconsin locations. In July 2017, the Company relocated all of its product manufacturing operations in Shullsburg, Wisconsin to the Scottsdale, Arizona facility. See Note 4 for additional information relating to the Company’s acquisition of the Antenna Plus assets. Inventory is stated at the lower of cost or net realizable value. For items manufactured by the Company, cost is determined using the weighted average cost method. For items manufactured by third parties, cost is determined using the first-in, first-out method (FIFO). Any adjustments to reduce the cost of inventories to their net realizable value are recognized in earnings in the current period. As of December 31, 2018, the Company’s inventories consist primarily of raw materials. Provisions for excess and obsolete inventories are estimated based on product life cycles, quality issues, and historical experience. As of December 31, 2018 and December 31, 2017, there was no provision for excess and obsolete inventories.
Property and Equipment	( h ) Property and Equipment Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, generally three years. The estimated useful lives for leasehold improvements is determined as either the estimated useful life of the asset or the lease term, whichever is shorter. Depreciation of assets that are recorded under operating leases are included in depreciation expense. Maintenance and repairs are expensed as incurred. Property and equipment are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. When assets are sold, or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts and any gain or loss is included as a non-operating expense.
Goodwill	( i ) Goodwill Goodwill, which has an indefinite useful life, represents the excess of cost over fair value of net assets acquired. The change in the carrying value of goodwill during the year ended December 31, 2017, was due to an acquisition during 2017. See Note 5. The Company reviews goodwill for impairment annually on December 1st and whenever events or changes in circumstances indicate that goodwill may be impaired. The Company completed its annual assessment for goodwill impairment in December 2018 and determined that goodwill is not impaired as of December 31, 2018.
Long-lived Assets	( j ) Long-lived Assets The Company’s identifiable intangible assets are comprised of acquired developed technologies, customer relationships, tradenames and non-compete agreements. The cost of the identifiable intangible assets with finite lives is amortized on a straight-line basis over the assets’ respective estimated useful lives. The Company periodically re-evaluates the original assumptions and rationale utilized in the establishment of the carrying value and estimated lives of long-lived assets and finite-lived intangible assets. Long- lived assets and finite-lived intangibles are assessed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If an asset is considered to be impaired, the impairment recognized is equal to the amount by which the carrying value of the asset exceeds its fair value.
Revenue Recognition	( k ) Revenue Recognition The Company generates revenue primarily from the sale of its antenna products. The Company recognizes revenue when products are shipped and the customer takes ownership and assumes risk of loss, collection of the relevant receivable is reasonably assured, persuasive evidence of an arrangement exists, and the sales price is fixed or determinable. Title and risk of loss transfer to customers either when the products are shipped to or received by the customer, based on the terms of the specific agreement with the customer. A portion of the Company’s sales are made through distributors under agreements allowing for pricing credits and/or rights of return under certain circumstances. Pricing credits and returns under these provisions have been insignificant; accordingly, the Company’s allowance for sales returns and pricing credits was insignificant for the years ended December 31, 2018, 2017 and 2016. To date, services revenues have been immaterial as a percentage of total revenues. Service revenues are recognized ratably over the term of the agreement.
Shipping and Transportation Costs	( l ) Shipping and Transportation Costs Shipping and other transportation costs are expensed as incurred. Shipping and other transportation costs were $433,234, $462,297 and $321,093 for the years ended December 31, 2018, 2017 and 2016, respectively. These costs are included in general and administrative expenses in the accompanying statements of operations.
Research and Development Costs	( m ) Research and Development Costs Costs incurred in connection with research and development are expensed as incurred.
Advertising Costs	(n) Advertising Costs Advertising costs are expensed as incurred and included in sales and marketing expenses. Advertising costs were $2,525,626, $15,867 and $0, for the years ended December 31, 2018, 2017 and 2016, respectively.
Income Taxes	( o ) Income Taxes The Company records income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statements carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. When applicable, a valuation allowance is established to reduce any deferred tax asset when it is determined that it is more likely than not that some portion of the deferred tax asset will not be realized. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company records interest related to unrecognized tax benefits in interest expense and penalties in general and administrative expenses.
Stock-Based Compensation	( p ) Stock-Based Compensation The Company recognizes all employee stock-based compensation as a cost in the financial statements. Equity classified awards are measured at the grant-date fair value of the award. The Company estimates the grant-date fair value using the Black-Scholes-Merton option-pricing model. The Company recognizes forfeitures when incurred. Compensation cost is recognized on a straight-line basis over the requisite service period for the entire award. Stock-based compensation expense for the years ended December 31, 2018, 2017 and 2016 was $2,910,070, $736,066 and $298,535, respectively.
Fair Value Measurements	( q ) Fair Value Measurements The carrying values of the Company’s financial instruments, including cash, trade accounts receivable, accounts payable, and accrued liabilities approximate their fair values due to the short maturity of these instruments. Fair value measurements are market-based measurements, not entity-specific measurements. Therefore, fair value measurements are determined based on the assumptions that market participants would use in pricing the asset or liability. The Company follows a three-level hierarchy to prioritize the inputs used in the valuation techniques to derive fair values. The basis for fair value measurements for each level within the hierarchy is described below: • Level 1: Quoted prices in active markets for identical assets or liabilities. • Level 2: Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets. • Level 3: Valuations derived from valuation techniques in which one or more significant inputs are unobservable in active markets.
Use of Estimates	( r ) Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant items subject to such estimates and assumptions include valuation of the preferred redeemable convertible stock warrant liability, stock- based compensation and intangible assets.
Accumulated Other Comprehensive Loss	( s ) Accumulated Other Comprehensive Loss Comprehensive income (loss) is comprised of net income (loss) and other comprehensive income (loss). Accumulated other comprehensive loss on the balance sheet at December 31, 2018 and December 31, 2017 includes unrealized gains and losses on the Company’s available-for-sale securities.
Net Income (Loss) Per Share	( t ) Net Income (Loss) Per Share Basic net income (loss) per share is calculated by dividing net income (loss) available to common stockholders by the weighted average shares of common stock outstanding for the period. Diluted net income (loss) per share is calculated by dividing net income (loss) by the weighted average shares of common stock outstanding for the period plus amounts representing the dilutive effect of securities that are convertible into common stock. Preferred dividends are deducted from net income (loss) in arriving at net income (loss) attributable to common stockholders. The Company calculates diluted earnings (loss) per common share using the treasury stock method and the as-if-converted method, as applicable. The following table presents the computation of net income or loss per share: For the Year Ended December 31, 2018 2017 2016 Numerator: Net income (loss) $ (2,584,320 ) $ 1,141,255 $ 3,733,707 Accretion of dividends on preferred stock — — (1,537,021 ) Net income (loss) attributable to common stockholders - basic $ (2,584,320 ) $ 1,141,255 $ 2,196,686 Accretion of dividends on preferred stock — — 125,205 Adjustment for change in fair value of warrant liability — — (460,289 ) Net income (loss) attributable to common stockholders - diluted $ (2,584,320 ) $ 1,141,255 $ 1,861,602 Denominator: Weighted average common shares outstanding Basic 9,520,947 9,485,271 3,373,316 Diluted 9,520,947 10,361,373 4,667,503 Net income (loss) per share: Basic $ (0.27 ) $ 0.12 $ 0.65 Diluted $ (0.27 ) $ 0.11 $ 0.40 Basic and diluted weighted average common shares outstanding for the year ended December 31, 2018 were the same. Diluted weighted average common shares outstanding for the year ended December 31, 2017 includes 1,532 warrants and 874,571 options outstanding. Diluted weighted average common shares outstanding for the year ended December 31, 2016 includes 577,529 options outstanding and 716,658 preferred shares. Potentially dilutive securities not included in the calculation of diluted net income (loss) per share because to do so would be anti-dilutive are as follows (in common stock equivalent shares): For the Year Ended December 31, 2018 2017 2016 Preferred redeemable convertible stock, including accumulated dividends — — 2,406,894 Employee stock options 978,464 513,869 — Warrants outstanding 51,003 — 51,003 Total 1,029,467 513,869 2,457,897

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Computation of Net Income or Loss Per Share	The following table presents the computation of net income or loss per share: For the Year Ended December 31, 2018 2017 2016 Numerator: Net income (loss) $ (2,584,320 ) $ 1,141,255 $ 3,733,707 Accretion of dividends on preferred stock — — (1,537,021 ) Net income (loss) attributable to common stockholders - basic $ (2,584,320 ) $ 1,141,255 $ 2,196,686 Accretion of dividends on preferred stock — — 125,205 Adjustment for change in fair value of warrant liability — — (460,289 ) Net income (loss) attributable to common stockholders - diluted $ (2,584,320 ) $ 1,141,255 $ 1,861,602 Denominator: Weighted average common shares outstanding Basic 9,520,947 9,485,271 3,373,316 Diluted 9,520,947 10,361,373 4,667,503 Net income (loss) per share: Basic $ (0.27 ) $ 0.12 $ 0.65 Diluted $ (0.27 ) $ 0.11 $ 0.40
Summary of Potentially Dilutive Securities	Potentially dilutive securities not included in the calculation of diluted net income (loss) per share because to do so would be anti-dilutive are as follows (in common stock equivalent shares): For the Year Ended December 31, 2018 2017 2016 Preferred redeemable convertible stock, including accumulated dividends — — 2,406,894 Employee stock options 978,464 513,869 — Warrants outstanding 51,003 — 51,003 Total 1,029,467 513,869 2,457,897

Cash, Cash Equivalents and Sh_2

Cash, Cash Equivalents and Short-Term Investments (Tables)	12 Months Ended
	Dec. 31, 2018
Cash And Cash Equivalents [Abstract]
Schedule of Cash and Cash Equivalents and Short-Term Investments by Significant Investment Category	The following table shows the Company’s cash and cash equivalents and short-term investments by significant investment category as of December 31, 2018: December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Cash and Cash Equivalents Short-Term Investments Cash $ 3,043,800 $ — $ — $ 3,043,800 $ 3,043,800 $ — Level 1 (1): Money market funds 5,481,647 — — 5,481,647 5,481,647 — U.S. treasury securities 1,987,794 — (164 ) 1,987,630 — 1,987,630 Subtotal 7,469,441 — (164 ) 7,469,277 5,481,647 1,987,630 Level 2 (2): Commercial paper 10,639,390 — — 10,639,390 2,094,983 8,544,407 Corporate debt obligations 5,963,913 — (6,678 ) 5,957,235 — 5,957,235 Repurchase agreements 3,000,226 — — 3,000,226 3,000,226 — Asset-backed securities 3,682,413 250 (2,954 ) 3,679,709 — 3,679,709 Subtotal 23,285,942 250 (9,632 ) 23,276,560 5,095,209 18,181,351 Total $ 33,799,183 $ 250 $ (9,796 ) $ 33,789,637 $ 13,620,656 $ 20,168,981 December 31, 2017 Amortized Cost Gross Unrealized Losses Estimated Fair Value Cash and Cash Equivalents Short-Term Investments Long-Term Marketable Securities Cash $ 3,040,696 $ — $ 3,040,696 $ 3,040,696 $ — $ — Level 1 (1): Money market funds 8,234,751 — 8,234,751 8,234,751 — — U.S. treasury securities 2,490,799 (5,540 ) 2,485,259 — 2,485,259 — Subtotal 10,725,550 (5,540 ) 10,720,010 8,234,751 2,485,259 — Level 2 (2): Commercial paper 9,716,093 — 9,716,093 — 9,716,093 — Corporate debt obligations 6,829,191 (9,414 ) 6,819,777 — 6,819,777 — Repurchase agreements 3,000,233 — 3,000,233 3,000,233 — — Asset-backed securities 3,018,276 (1,953 ) 3,016,323 750,388 2,265,935 — Subtotal 22,563,793 (11,367 ) 22,552,426 3,750,621 18,801,805 — Total $ 36,330,039 $ (16,907 ) $ 36,313,132 $ 15,026,068 $ 21,287,064 $ — (1) Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities. (2) Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Summary of Short-term Investments with Unrealized Losses	The following table presents the Company’s short-term investments with unrealized losses by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2018: Less Than 12 Months Description of Securities Estimated Fair Value Unrealized Losses December 31, 2018 U.S. treasury securities $ 1,987,630 $ (164 ) Corporate debt obligations 5,957,235 (6,678 ) Asset-backed securities 3,031,912 (2,954 ) Total $ 10,976,777 $ (9,796 )
Schedule of Contractual Maturities of Short-term Investments	Contractual maturities of short-term investments as of December 31, 2018 are as follows: Estimated Fair Value Due within one year $ 20,168,981 Total $ 20,168,981

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Schedule of Property and Equipment	Depreciation and amortization of property and equipment is calculated on the straight-line method based on estimated useful lives of six to ten years for tenant improvements and three to five years for all other property and equipment. Property and equipment consist of the following: As of December 31, 2018 2017 Lab equipment $ 2,503,086 $ 1,914,911 Computer equipment 113,248 169,366 Computer software 193,694 299,227 Furniture and fixtures 266,960 202,218 Tenant improvements 894,304 763,898 Other office equipment 126,099 63,825 4,097,391 3,413,445 Less accumulated depreciation (2,696,800 ) (2,376,585 ) $ 1,400,591 $ 1,036,860

Acquisitions (Tables)

Acquisitions (Tables) - Antenna Plus	12 Months Ended
	Dec. 31, 2018
Business Acquisition [Line Items]
Summary of Allocation of Purchase Price for Acquired Identifiable Assets, Liabilities Assumed and Goodwill	The following table shows the allocation of the purchase price for Antenna Plus to the acquired identifiable assets, liabilities assumed and goodwill: Consideration: Cash $ 6,383,500 Working capital adjustments (34,770 ) Fair value of total consideration transferred $ 6,348,730 Recognized amounts of identifiable assets acquired and liabilities assumed: Accounts receivable $ 584,390 Inventory 432,770 Fixed assets 402,958 Intangible assets 2,600,000 Current liabilities (121,879 ) Total identifiable net assets acquired 3,898,239 Goodwill 2,450,491 Total $ 6,348,730
Summary of Unaudited Pro Forma Information	The following unaudited pro forma financial information presents combined results of operations for each of the periods presented, as if Antenna Plus had been acquired as of the beginning of the fiscal year 2016. The pro forma information includes adjustments to amortization and depreciation for intangible assets and property, plant and equipment acquired. The pro forma data are for informational purposes only and are not necessarily indicative of the consolidated results of operations of the combined business had the acquisition actually occurred at the beginning of fiscal year 2016 or of the results of future operations of the combined business. Consequently, actual results will differ from the unaudited pro forma information presented below: For the Year Ended December 31, 2017 2016 Pro forma sales $ 51,789,215 $ 50,940,773 Pro forma income from operations $ 1,539,538 $ 4,436,281 Pro forma net income $ 1,711,598 $ 4,717,872

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of changes in goodwill	Changes to the Company’s goodwill balance during the year ended December 31, 2018 and 2017 are as follows: Balance at December 31, 2016 $ 1,249,956 Current period adjustments 2,450,491 Balance at December 31, 2017 $ 3,700,447 Current period adjustments — Balance at December 31, 2018 $ 3,700,447

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Acquired Intangible Assets	The following is a summary of the Company’s acquired intangible assets: As of December 31, 2018 Weighted Average Amortization Period (years) Gross Carrying Amount Accumulated Amortization Intangibles, Net Customer relationships 10 $ 4,830,000 $ 1,237,082 $ 3,592,918 Developed technologies 9 1,080,000 274,528 805,472 Tradename 3 120,000 66,667 53,333 Non-compete agreement 3 67,000 67,000 — Total intangible assets, net 10 $ 6,097,000 $ 1,645,277 $ 4,451,723 As of December 31, 2017 Weighted Average Amortization Period (years) Gross Carrying Amount Accumulated Amortization Intangibles, Net Customer relationships 10 $ 4,830,000 $ 754,082 $ 4,075,918 Developed technologies 9 1,080,000 142,477 937,523 Tradename 3 120,000 26,667 93,333 Non-compete agreement 3 67,000 45,523 21,477 Total intangible assets, net 10 $ 6,097,000 $ 968,749 $ 5,128,251
Schedule of Estimated Annual Amortization of Intangible Assets	The estimated annual amortization of intangible assets for the next five years and thereafter is shown in the following table. Actual amortization expense to be reported in future periods could differ from these estimates as a result of acquisitions, divestitures, asset impairments, among other factors. Estimated Future Amortization 2019 655,052 2020 628,385 2021 597,701 2022 563,000 2023 563,000 Thereafter 1,444,585 Total $ 4,451,723

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Income Tax Provisions	The December 31, 2018, 2017 and 2016 income tax provision is as follows: For the Year Ended December 31, 2018 2017 2016 Current: U.S. federal $ 67,632 $ 21,272 $ — State and local 5,902 2,608 2,015 Total current provision 73,534 23,880 2,015 Deferred: U.S. federal 23,137 483 6,124 State and local 4,872 1,322 42 Total deferred provision 28,009 1,805 6,166 Total tax provision $ 101,543 $ 25,685 $ 8,181
Schedule of Reconciliation of Income Tax Provision to Statutory Federal Income Tax Rate	A reconciliation of the total income tax provision tax rate to the statutory federal income tax rate of 21%, 34% and 34% for the years ended December 31, 2018, 2017 and 2016, respectively, is as follows: For the Year Ended December 31, 2018 2017 2016 Income taxes at statutory rates $ (521,383 ) $ 396,760 $ 1,272,242 State income tax, net of federal benefit 10,774 3,910 2,054 Permanent items 17,771 (5,060 ) 68,944 Meals and entertainment 46,983 74,755 54,375 Equity based compensation (99,007 ) (645,512 ) 48,385 Warrant liability — — (156,498 ) Corporate tax rate change - impact on deferred income taxes — 2,768,458 — Research and development credit (195,336 ) 206,801 (141,494 ) Federal NOL adjustment — (386,441 ) (206,133 ) Federal return to provision (167,755 ) 53,265 11,104 Other federal credits — 112,262 — Other 64,196 15,695 — Change in federal valuation allowance 945,300 (2,569,208 ) (944,798 ) $ 101,543 $ 25,685 $ 8,181
Deferred Income Tax Assets and Liabilities	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2018 and 2017 are as follows: For the Year Ended December 31, 2018 2017 Deferred tax assets: Net operating loss carryforwards $ 4,924,181 $ 4,584,606 Capitalization of patent costs, goodwill and amortization 247,239 221,593 Capitalization of acquisition costs 81,088 84,640 Research and AMT credits 2,074,363 1,447,479 Stock based compensation 326,755 82,085 Deferred lease obligation 63,946 91,017 Accrued bonuses 198,102 — Other timing differences 60,773 72,787 7,976,447 6,584,207 Less valuation allowance (7,658,670 ) (6,453,466 ) Total deferred tax assets, net of allowance $ 317,777 $ 130,741 Deferred tax liabilities: Fixed assets (192,673 ) (104,324 ) Goodwill (162,681 ) (34,388 ) Total deferred tax liabilities $ (355,354 ) $ (138,712 ) Total deferred tax liabilities $ (37,577 ) $ (7,971 )
Summary of Reconciliation of Unrecognized Tax Benefit Activity	The following table summarizes the reconciliation of the unrecognized tax benefits activity during the years ended December 31, 2018 and 2017: For the Year Ended December 31, 2018 2017 Beginning unrecognized tax benefits $ 710,000 $ 1,532,000 Decreases related to prior year tax positions (65,000 ) (1,001,000 ) Increases related to current year tax positions 87,000 179,000 Ending unrecognized tax benefits $ 732,000 $ 710,000

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Class Of Stock Disclosures [Abstract]
Schedule of Common Stock Reserved for Future Issuance	The following common stock is reserved for future issuance at December 31, 2018 and 2017 : As of December 31, 2018 2017 Warrants issued and outstanding 51,003 51,003 Stock option awards issued and outstanding 1,407,049 1,203,627 Authorized for grants under the 2016 Equity Incentive Plan 463,491 633,052 Authorized for grants under the 2016 Employee Stock Purchase Plan 100,000 100,000 2,021,543 1,987,682 (1) Treasury stock in the amount of 357,314 and 135,000 as of December 31, 2018 and 2017, respectively, are excluded from the table above.

Preferred Redeemable Converti_2

Preferred Redeemable Convertible Stock (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of Preferred Redeemable Convertible Stock	The following table provides a rollforward of the preferred redeemable convertible stock during the year ended December 31, 2016: Preferred redeemable convertible stock Shares Amount Balance at December 31, 2015 23,271,702 $ 43,106,906 Effect of accretion to redemption value — 1,356,707 Conversion of preferred redeemable convertible stock into common stock (23,271,702 ) (44,463,613 ) Balance at December 31, 2016 — $ —

Stock Options (Tables)

Stock Options (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted Average Assumptions Used in Estimating Fair Value of Stock Options	As of December 31, 2018 2017 2016 Valuation assumptions: Expected dividend yield 0 % 0 % 0 % Expected volatility 37.60 % 39.37 % 41.82 % Expected term (years) 5.86 6.06 6.07 Risk-free interest rate 2.6 % 1.9 % 1.6 %
Summary of Outstanding Stock Option Activity	Stock option activity during the periods indicated is as follows: Number of shares Weighted average exercise price Weighted average remaining contractual term Balance at December 31, 2015 756,692 $ 2.10 7.6 Granted 359,319 2.60 9.4 Exercised (58,155 ) 2.36 3.5 Expired/Forfeited (17,469 ) 2.13 2.6 Balance at December 31, 2016 1,040,387 $ 2.25 7.8 Granted 471,144 14.72 9.1 Exercised (284,455 ) 2.07 5.2 Expired/Forfeited (23,449 ) 8.22 — Balance at December 31, 2017 1,203,627 $ 7.06 8.1 Granted 1,009,134 9.94 6.8 Exercised (341,456 ) 2.24 1.3 Expired/Forfeited (464,256 ) 11.81 — Balance at December 31, 2018 1,407,049 $ 8.73 8.1 Vested and exercisable at December 31, 2018 504,287 $ 6.28 7.0 Vested and expected to vest at December 31, 2018 1,407,049 $ 8.73 8.1

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments Under Operating Leases	The future minimum lease payments required under operating leases in effect at December 31, 2018 were as follows: Year ending: 2019 $ 933,886 2020 560,432 2021 180,423 2022 22,526 $ 1,697,267

Concentration of Credit Risk (T

Concentration of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2018
Risks And Uncertainties [Abstract]
Schedule of Concentration of Sales and Accounts Receivable	The following represents customers that accounted for 10% or more of total revenue during the years ended December 31, 2018, 2017 and 2016 and customers that accounted for 10% or more of total trade accounts receivable at December 31, 2018 and 2017: For the Year Ended December 31, 2018 2017 2016 Percentage of net revenue Customer A 36 % 21 % 20 % Customer B 8 % 13 % 31 % Customer C 7 % 10 % 8 % As of December 31, 2018 2017 Percentage of gross trade accounts receivable Customer A 32 % 13 % Customer B 14 % 4 % Customer C 14 % 9 % Customer D 8 % 10 % Customer E (1) — 19 % (1) For the year ended December 31, 2018, Customer E was moved under a distributer and is included in the balance for Customer A.
Schedule of Revenue by Geographic area	Net revenue by geographic area are as follows. Revenue is attributed by geographic location based on the bill-to location of the Company’s customers. For the Year Ended December 31, 2018 2017 2016 Percentage of net revenue China 75 % 67 % 74 % Other Asia 5 10 11 North America 16 18 10 Europe 4 5 5

Quarterly Financial Informati_2

Quarterly Financial Information (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Results of Operations	The following is a summary of the quarterly results of operations for the years ended December 31, 2018 and 2017: For the Three Months Ended December 31, 2018 September 30, 2018 June 30, 2018 March 31, 2018 Sales $ 16,561,520 $ 15,786,913 $ 14,971,681 $ 13,305,098 Gross Profit 6,850,134 6,865,342 6,601,521 6,194,171 Total operating expenses 5,730,406 6,558,122 10,250,807 7,357,840 Net income (loss) 1,274,559 437,259 (3,190,347 ) (1,105,791 ) Basic net income (loss) per share $ 0.13 $ 0.05 $ (0.34 ) $ (0.12 ) Diluted net income (loss) per share $ 0.13 $ 0.04 $ (0.34 ) $ (0.12 ) For the Three Months Ended December 31, 2017 September 30, 2017 June 30,      March 31, 2017 Sales $ 12,807,175 $ 12,448,436 $ 13,013,143 $ 11,252,417 Gross Profit 5,888,332 6,003,892 6,121,524 5,288,458 Total operating expenses 5,418,089 5,803,260 6,248,678 4,862,979 Net income (loss) 591,933 234,353 (70,121 ) 385,090 Basic net loss per share $ 0.06 $ 0.02 $ (0.01 ) $ 0.04 Diluted net loss per share $ 0.06 $ 0.02 $ (0.01 ) $ 0.04

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018USD ($)Segmentshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)shares
Significant Accounting Policies [Line Items]
Number of operating segments | Segment	1
Allowance for doubtful trade accounts receivable	$ 0	$ 0
Goodwill impairment	0
Shipping and other transportation costs	$ 433,234	$ 462,297	$ 321,093
Type of Cost, Good or Service [Extensible List]	us-gaap:ShippingAndHandlingMember	us-gaap:ShippingAndHandlingMember	us-gaap:ShippingAndHandlingMember
Advertising costs	$ 2,525,626	$ 15,867	$ 0
Stock-based compensation	$ 2,910,070	$ 736,066	$ 298,535
Diluted weighted average common shares outstanding | shares	9,520,947	10,361,373	4,667,503
Warrant
Significant Accounting Policies [Line Items]
Diluted weighted average common shares outstanding | shares		1,532
Options Outstanding
Significant Accounting Policies [Line Items]
Diluted weighted average common shares outstanding | shares		874,571	577,529
Preferred Shares
Significant Accounting Policies [Line Items]
Diluted weighted average common shares outstanding | shares			716,658
Property and Equipment, Other
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life	3 years

Significant Accounting Polici_5

Significant Accounting Policies - Summary of Computation of Net Income or Loss Per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income (loss)	$ 1,274,559	$ 437,259	$ (3,190,347)	$ (1,105,791)	$ 591,933	$ 234,353	$ (70,121)	$ 385,090	$ (2,584,320)	$ 1,141,255	$ 3,733,707
Accretion of dividends on preferred stock											(1,537,021)
Net income (loss) attributable to common stockholders									(2,584,320)	1,141,255	2,196,686
Accretion of dividends on preferred stock											125,205
Adjustment for change in fair value of warrant liability											(460,289)
Net income (loss) attributable to common stockholders - diluted									$ (2,584,320)	$ 1,141,255	$ 1,861,602
Weighted average shares used in calculating income (loss) per share
Basic									9,520,947	9,485,271	3,373,316
Diluted									9,520,947	10,361,373	4,667,503
Net income (loss) per share:
Basic	$ 0.13	$ 0.05	$ (0.34)	$ (0.12)	$ 0.06	$ 0.02	$ (0.01)	$ 0.04	$ (0.27)	$ 0.12	$ 0.65
Diluted	$ 0.13	$ 0.04	$ (0.34)	$ (0.12)	$ 0.06	$ 0.02	$ (0.01)	$ 0.04	$ (0.27)	$ 0.11	$ 0.40

Significant Accounting Polici_6

Significant Accounting Policies - Summary of Potentially Dilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the calculation of diluted net loss per share	1,029,467	513,869	2,457,897
Preferred Redeemable And Convertible Stock, Including Accumulated Dividends
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the calculation of diluted net loss per share			2,406,894
Employee Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the calculation of diluted net loss per share	978,464	513,869
Warrants outstanding
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the calculation of diluted net loss per share	51,003		51,003

Cash, Cash Equivalents and Sh_3

Cash, Cash Equivalents and Short-Term Investments - Schedule of Cash and Cash Equivalents and Short-term Investments by Significant Investment Category (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash	$ 3,043,800	$ 3,040,696
Short term investments Gross Unrealized Gains	250
Short term investments Gross Unrealized Losses	(9,796)	(16,907)
Short term investments	20,168,981	21,287,064
Cash and cash equivalents and Short term investments, Amortized Cost	33,799,183	36,330,039
Cash and cash equivalents and Short term investments, Estimated Fair Value	33,789,637	36,313,132
Cash and cash equivalents	13,620,656	15,026,068	$ 45,161,403	$ 5,335,913
Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short term investments Gross Unrealized Losses	(164)	(5,540)
Cash equivalents and Short term investments, Estimated Fair Value	7,469,277	10,720,010
Cash equivalents and Short term investments, Amortized Cost	7,469,441	10,725,550
Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short term investments Gross Unrealized Gains	250
Short term investments Gross Unrealized Losses	(9,632)	(11,367)
Short term investments	18,181,351	18,801,805
Cash equivalents and Short term investments, Estimated Fair Value	23,276,560	22,552,426
Cash and cash equivalents	5,095,209	3,750,621
Cash equivalents and Short term investments, Amortized Cost	23,285,942	22,563,793
Money Market Funds | Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	5,481,647	8,234,751
Repurchase Agreements | Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	3,000,226	3,000,233
US Treasury Securities | Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	1,987,794	2,490,799
Short term investments Gross Unrealized Losses	(164)	(5,540)
Short term investments	1,987,630	2,485,259
Commercial Paper | Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	2,094,983
Short Term Investments Amortized Cost	10,639,390	9,716,093
Short term investments	8,544,407	9,716,093
Cash equivalents and Short term investments, Estimated Fair Value	10,639,390	9,716,093
Corporate Debt Securities | Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	5,963,913	6,829,191
Short term investments Gross Unrealized Losses	(6,678)	(9,414)
Short term investments	5,957,235	6,819,777
Asset-backed Securities | Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents		750,388
Short Term Investments Amortized Cost	3,682,413	3,018,276
Short term investments Gross Unrealized Gains	250
Short term investments Gross Unrealized Losses	(2,954)	(1,953)
Short term investments	3,679,709	2,265,935
Cash equivalents and Short term investments, Estimated Fair Value	$ 3,679,709	$ 3,016,323

Cash, Cash Equivalents and Sh_4

Cash, Cash Equivalents and Short-Term Investments - Summary of Short-term Investments with Unrealized Losses (Details)	Dec. 31, 2018USD ($)
Cash And Cash Equivalents And Short Term Investments [Line Items]
Less Than 12 Months, Estimated Fair Value	$ 10,976,777
Less Than 12 Months, Unrealized Losses.	(9,796)
US Treasury Securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Less Than 12 Months, Estimated Fair Value	1,987,630
Less Than 12 Months, Unrealized Losses.	(164)
Corporate Debt Securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Less Than 12 Months, Estimated Fair Value	5,957,235
Less Than 12 Months, Unrealized Losses.	(6,678)
Asset-backed Securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Less Than 12 Months, Estimated Fair Value	3,031,912
Less Than 12 Months, Unrealized Losses.	$ (2,954)

Cash, Cash Equivalents and Sh_5

Cash, Cash Equivalents and Short-Term Investments - Schedule of Contractual Maturities of Short-term Investments (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Due within one year	$ 20,168,981
Total	$ 20,168,981	$ 21,287,064

Property and Equipment - Additi

Property and Equipment - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Depreciation expense	$ 586,884	$ 436,247	$ 495,347
Loss on disposal of fixed assets	$ 39,251
Tenant Improvement | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life	6 years
Tenant Improvement | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life	10 years
Property and Equipment, Other Types
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life	3 years
Property and Equipment, Other Types | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life	3 years
Property and Equipment, Other Types | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life	5 years

Property and Equipment - Schedu

Property and Equipment - Schedule of Property and Equipment (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 4,097,391	$ 3,413,445
Less accumulated depreciation	(2,696,800)	(2,376,585)
Property and equipment, net	1,400,591	1,036,860
Lab Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,503,086	1,914,911
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	113,248	169,366
Computer Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	193,694	299,227
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	266,960	202,218
Tenant Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	894,304	763,898
Other Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 126,099	$ 63,825

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($)	Apr. 27, 2017	Dec. 17, 2015	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Business acquisition, sales			$ 16,561,520	$ 15,786,913	$ 14,971,681	$ 13,305,098	$ 12,807,175	$ 12,448,436	$ 13,013,143	$ 11,252,417	$ 60,625,212	$ 49,521,171	$ 43,433,867
Business acquisition, cost of goods sold											34,114,044	26,218,965	24,156,792
Net income (loss)			1,274,559	$ 437,259	$ (3,190,347)	$ (1,105,791)	$ 591,933	$ 234,353	$ (70,121)	$ 385,090	(2,584,320)	1,141,255	$ 3,733,707
Business acquisition up front payment												6,348,730
Payment of deferred purchase price outstanding amount											375,000
Business combination, gain on deferred purchase price liability											$ 388,733
Antenna Plus
Business Acquisition [Line Items]
Total consideration paid in cash	$ 6,348,730
Business acquisition, sales												5,200,000
Business acquisition, cost of goods sold												2,300,000
Net income (loss)												$ 400,000
Business acquisition pro forma information description											The pro forma information includes adjustments to amortization and depreciation for intangible assets and property, plant and equipment acquired. The pro forma data are for informational purposes only and are not necessarily indicative of the consolidated results of operations of the combined business had the acquisition actually occurred at the beginning of fiscal year 2016 or of the results of future operations of the combined business.
Business acquisition up front payment	6,383,500
Accounts receivable	$ 584,390
Skycross, Inc.
Business Acquisition [Line Items]
Date of asset purchase agreement		Dec. 17, 2015
Business acquisition up front payment		$ 4,000,000
Contingent consideration arrangement		1,000,000									$ 1,000,000
Business Combination Contingent Consideration Arrangements Description											The $1.0 million of contingent consideration is payable upon the later of (i) the expiration of the Transition Services Agreement between the Company and Skycross which defined transition services to be provided by Skycross to the Company and (ii) the date on which the Company received copies of third party approvals with respect to each customer and program that was purchased.
Amount to be paid under contingent consideration arrangements, value, low		0
Amount to be paid under contingent consideration arrangements, value, high		$ 1,000,000
Accounts receivable			362,069								$ 362,069
Payment of deferred purchase price outstanding amount											375,000
Business combination, due to skycross			$ 125,802								125,802
Business combination, gain on deferred purchase price liability											$ 388,733

Acquisitions - Summary of Alloc

Acquisitions - Summary of Allocation of Purchase Price for Acquired Identifiable Assets, Liabilities Assumed and Goodwill (Details) - USD ($)	Apr. 27, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Consideration:
Cash		$ 6,348,730
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill		$ 3,700,447	$ 3,700,447	$ 1,249,956
Antenna Plus
Consideration:
Cash	$ 6,383,500
Working capital adjustments	(34,770)
Fair value of total consideration transferred	6,348,730
Recognized amounts of identifiable assets acquired and liabilities assumed:
Accounts receivable	584,390
Inventory	432,770
Fixed assets	402,958
Intangible assets	2,600,000
Current liabilities	(121,879)
Total identifiable net assets acquired	3,898,239
Goodwill	2,450,491
Total	$ 6,348,730

Acquisitions - Summary of Unaud

Acquisitions - Summary of Unaudited Pro Forma Information (Details) - Antenna Plus - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Pro forma sales	$ 51,789,215	$ 50,940,773
Pro forma income from operations	1,539,538	4,436,281
Pro forma net income	$ 1,711,598	$ 4,717,872

Goodwill - Schedule of Changes

Goodwill - Schedule of Changes In Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 3,700,447	$ 1,249,956
Current period adjustments	0	2,450,491
Ending balance	$ 3,700,447	$ 3,700,447

Intangible Assets - Summary of

Intangible Assets - Summary of Acquired Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)	10 years	10 years
Gross Carrying Amount	$ 6,097,000	$ 6,097,000
Accumulated Amortization	1,645,277	968,749
Intangibles, Net	$ 4,451,723	$ 5,128,251
Customer relationships
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)	10 years	10 years
Gross Carrying Amount	$ 4,830,000	$ 4,830,000
Accumulated Amortization	1,237,082	754,082
Intangibles, Net	$ 3,592,918	$ 4,075,918
Developed technologies
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)	9 years	9 years
Gross Carrying Amount	$ 1,080,000	$ 1,080,000
Accumulated Amortization	274,528	142,477
Intangibles, Net	$ 805,472	$ 937,523
Tradename
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)	3 years	3 years
Gross Carrying Amount	$ 120,000	$ 120,000
Accumulated Amortization	66,667	26,667
Intangibles, Net	$ 53,333	$ 93,333
Non-compete agreement
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)	3 years	3 years
Gross Carrying Amount	$ 67,000	$ 67,000
Accumulated Amortization	$ 67,000	45,523
Intangibles, Net		$ 21,477

Intangible Assets - Schedule of

Intangible Assets - Schedule of Estimated Annual Amortization of Intangible Assets (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
2019	$ 655,052
2020	628,385
2021	597,701
2022	563,000
2023	563,000
Thereafter	1,444,585
Intangibles, Net	$ 4,451,723	$ 5,128,251

Intangible Assets - Additional

Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization	$ 676,528	$ 581,386	$ 373,350

Long-term Notes Payable (incl_2

Long-term Notes Payable (including current portion) and Line of Credit - Additional Information (Details)	Feb. 01, 2017USD ($)	Jan. 31, 2018USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2013USD ($)Installment	Dec. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Feb. 26, 2019USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)
Loan Agreement With Silicon Valley Bank
Line Of Credit Facility [Line Items]
Loan agreement amount			$ 4,000,000		$ 4,000,000	$ 4,000,000
Term of payments			36 months
Date of maturity			Dec. 1, 2018
Liquidity ratio					125.00%
Minimum EBITDA						750,000
Interest rate fixed percentage			5.00%
Long-term debt					$ 0	0	$ 1,333,333	$ 1,333,333
Loan Agreement With Silicon Valley Bank | Maximum
Line Of Credit Facility [Line Items]
Unrestricted Cash Required For Line Of Credit Covenant									$ 25,000,000
Silicon Valley Bank | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Line of credit facility allowable amount		$ 10,000,000
Line of credit facility maturity date		Jan. 31, 2020
Line of credit					0	$ 0
Liquidity ratio		125.00%
Line of credit facility borrowing base limitation percentage of eligible receivables		80.00%
Interest rate fixed percentage		$ 3,000
Line of credit facility floating rate not met		2.00%				5.25%
Silicon Valley Bank | Revolving Credit Facility | The Wall Street Journal Prime Rate
Line Of Credit Facility [Line Items]
Basis spread on variable interest rate		1.00%				5.25%
Line Of Credit Facility Interest Rate Description						The Company will be required to pay interest on borrowings outstanding, if any, under the revolving line of credit at a floating rate per annum equal to 1% above the Wall Street Journal prime rate (5.25% as of December 31, 2018) (or, if unavailable, the Silicon Valley Bank prime rate) on a monthly basis, so long as the Company maintains a liquidity ratio of cash and cash equivalents plus accounts receivable to outstanding debt under the Amended Loan Agreement minus deferred revenue of 1.50 to 1.00. If this liquidity ratio is not met, the Company will be subject to a minimum interest charge of $3,000 per month and borrowings outstanding, if any, under the revolving line of credit will accrue interest at a floating rate per annum equal to 2% above the Wall Street Journal prime rate (5.25% as of December 31, 2018) (or, if unavailable the Silicon Valley Bank prime rate) on a monthly basis. Prior to the amendment in January 2018, the revolving line of credit bore interest rate at the U.S. prime rate plus 1.25%. The revolving line of credit matures on January 31, 2020.
Silicon Valley Bank | Revolving Credit Facility | Prime Rate
Line Of Credit Facility [Line Items]
Liquidity ratio		150.00%
Silicon Valley Bank | Revolving Credit Facility | U.S. Prime Rate
Line Of Credit Facility [Line Items]
Basis spread on variable interest rate		1.25%
Silicon Valley Bank | Revolving Credit Facility | Growth Capital Term Loan
Line Of Credit Facility [Line Items]
Line of credit facility allowable amount				$ 750,000
Line of credit facility, payment terms						The growth capital term loan required interest only payments through June 30, 2014 at which point it was to be repaid in 32 equal monthly installments of interest and principal.
Number of monthly installments for principal and interest payment | Installment				32
Line of credit facility maturity date						Feb. 1, 2017
Payment of principal and accrued interest	$ 55,230
Line of credit facility interest rate				6.50%
Line of credit					$ 0	$ 0

Treasury Stock - Additional Inf

Treasury Stock - Additional Information (Details) - USD ($)	Aug. 07, 2018	Aug. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Equity Class Of Treasury Stock [Line Items]
Stock repurchase, cost			$ 2,174,430	$ 1,257,100
Common Stock
Equity Class Of Treasury Stock [Line Items]
Stock repurchase, shares			222,314	135,000
Common Stock | Share Repurchase Program August 2017
Equity Class Of Treasury Stock [Line Items]
Stock approved for repurchase, value		$ 7,000,000
Period of stock repurchase program		12 months
Additional period of stock repurchase program	12 months
Stock repurchase, shares			222,314	135,000	357,314
Stock repurchase, average price per share			$ 9.92	$ 9.40	$ 9.60
Stock repurchase, cost			$ 2,174,430	$ 1,257,100	$ 3,431,530

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Tax Provisions (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
U.S. federal	$ 67,632	$ 21,272
State and local	5,902	2,608	$ 2,015
Total current provision	73,534	23,880	2,015
Deferred:
U.S. federal	23,137	483	6,124
State and local	4,872	1,322	42
Total deferred provision	28,009	1,805	6,166
Total tax provision	$ 101,543	$ 25,685	$ 8,181

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
U.S. federal statutory tax rate	21.00%	34.00%	34.00%
Valuation allowance	$ 7,658,670	$ 6,453,466
Net change in total valuation allowance	$ 1,205,204
Cumulative change in ownership percentage	50.00%
Period for cumulative change in ownership	3 years
Unrecognized tax benefit that would impact effective tax rate, if recognized	$ 9,040
Income tax interest and penalties accrued	2,051	785
Income tax interest and penalties	1,266	$ 785	$ 0
Maximum
Income Taxes [Line Items]
U.S. federal statutory tax rate		35.00%
CALIFORNIA
Income Taxes [Line Items]
Net operating loss carry forwards	$ 5,759,329
Net operating loss carry forwards, expire period	2028
Federal
Income Taxes [Line Items]
Net operating loss carry forwards	$ 20,710,625
Net operating loss carry forwards, expire period	2020
Tax credit carry forwards	$ 1,360,917
Tax credit carry forwards, expire period	2026
Federal | Maximum
Income Taxes [Line Items]
Operating loss carryforward available to offset future taxable income	$ 1,836,983
Percentage of future taxable income offset by operating loss carryforward	80.00%
State
Income Taxes [Line Items]
Tax credit carry forwards	$ 1,409,318

Income Taxes - Schedule of Reco

Income Taxes - Schedule of Reconciliation of Income Tax Provision to Statutory Federal Income Tax Rate (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income taxes at statutory rates	$ (521,383)	$ 396,760	$ 1,272,242
State income tax, net of federal benefit	10,774	3,910	2,054
Permanent items	17,771	(5,060)	68,944
Meals and entertainment	46,983	74,755	54,375
Equity based compensation	(99,007)	(645,512)	48,385
Warrant liability			(156,498)
Corporate tax rate change - impact on deferred income taxes		2,768,458
Research and development credit	(195,336)	206,801	(141,494)
Federal NOL adjustment		(386,441)	(206,133)
Federal return to provision	(167,755)	53,265	11,104
Other federal credits		112,262
Other	64,196	15,695
Change in federal valuation allowance	945,300	(2,569,208)	(944,798)
Total tax provision	$ 101,543	$ 25,685	$ 8,181

Income Taxes - Deferred Income

Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Net operating loss carryforwards	$ 4,924,181	$ 4,584,606
Capitalization of patent costs, goodwill and amortization	247,239	221,593
Capitalization of acquisition costs	81,088	84,640
Research and AMT credits	2,074,363	1,447,479
Stock based compensation	326,755	82,085
Deferred lease obligation	63,946	91,017
Accrued bonuses	198,102
Other timing differences	60,773	72,787
Deferred Tax Assets, Gross	7,976,447	6,584,207
Less valuation allowance	(7,658,670)	(6,453,466)
Total deferred tax assets, net of allowance	317,777	130,741
Deferred tax liabilities:
Fixed assets	(192,673)	(104,324)
Goodwill	(162,681)	(34,388)
Total deferred tax liabilities	(355,354)	(138,712)
Total deferred tax liabilities	$ (37,577)	$ (7,971)

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefit Activity (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Beginning unrecognized tax benefits	$ 710,000	$ 1,532,000
Decreases related to prior year tax positions	(65,000)	(1,001,000)
Increases related to current year tax positions	87,000	179,000
Ending unrecognized tax benefits	$ 732,000	$ 710,000

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions

Aug. 17, 2016

Nov. 30, 2003

Sep. 30, 2003

Mar. 31, 2001

Jun. 30, 2000

Dec. 31, 2018

Dec. 31, 2003

Jun. 30, 2009

Mar. 31, 2008

Feb. 28, 2007

Feb. 28, 2006

Jun. 30, 2005

Class Of Stock [Line Items]

Proceeds from issuance of common stock

$ 15

Offering price per share

$ 76.80

Series A Preferred Stock

Class Of Stock [Line Items]

Preferred convertible stock, shares issued

313,500

Preferred convertible stock sold, per share

$ 3.84

Proceeds from sale of preferred convertible stock, gross

$ 1.2

Preferred stock annual dividend rate per share

0.0488

Preferred stock, liquidation preference per share

19.20

Convertible preferred stock conversion price per share

21.70

Series B Preferred Stock

Class Of Stock [Line Items]

Preferred convertible stock, shares issued

290,993

Preferred convertible stock sold, per share

$ 4.39

Proceeds from sale of preferred convertible stock, gross

$ 1.3

Additional number of shares issued for services and to satisfy debt obligation

866,613

Proceed from issuance of additional stock

$ 1.2

Preferred stock annual dividend rate per share

0

Convertible preferred stock conversion price per share

24.23

Series C Preferred Stock

Class Of Stock [Line Items]

Preferred convertible stock, shares issued

682,000

Preferred convertible stock sold, per share

$ 1

Proceeds from sale of preferred convertible stock, gross

$ 0.7

Preferred stock annual dividend rate per share

0

Convertible preferred stock conversion price per share

8.59

Series D Preferred Stock

Class Of Stock [Line Items]

Preferred convertible stock, shares issued

4,091,068

Preferred convertible stock sold, per share

$ 0.542

Proceeds from sale of preferred convertible stock, gross

$ 2.2

Preferred stock annual dividend rate per share

0.0488

Preferred stock, liquidation preference per share

2.168

Convertible preferred stock conversion price per share

5.42

Series E Preferred Redeemable Convertible Stock

Class Of Stock [Line Items]

Preferred convertible stock, shares issued

7,984,727

7,984,727

Preferred convertible stock sold, per share

$ 1.11

$ 1.11

Preferred stock, liquidation preference per share

4.44

Series F Preferred Redeemable Convertible Stock

Class Of Stock [Line Items]

Preferred convertible stock, shares issued

4,734,374

Preferred convertible stock sold, per share

$ 1.30

Preferred stock, liquidation preference per share

5.20

Series G Preferred Stock

Class Of Stock [Line Items]

Preferred convertible stock sold, per share

$ 1.30

$ 1.30

Preferred stock, liquidation preference per share

$ 5.20

Junior Convertible Preferred Stock [Member]

Class Of Stock [Line Items]

Preferred convertible stock, shares outstanding

1,678,450

Preferred stock ownership percentage

50.00%

Preferred Convertible Stock | IPO

Class Of Stock [Line Items]

Conversion of stock, shares converted

6,244,174

Conversion of stock, shares issued

753,611

Preferred stock dividends converted into common stock

505,576

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Details) - shares	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Common stock, reserved for future issuance	2,021,543	1,987,682
Warrants Issued and Outstanding
Class Of Stock [Line Items]
Common stock, reserved for future issuance	51,003	51,003
Stock Option Awards Issued and Outstanding
Class Of Stock [Line Items]
Common stock, reserved for future issuance	1,407,049	1,203,627
Authorized for Grants under the 2016 Equity Incentive Plan
Class Of Stock [Line Items]
Common stock, reserved for future issuance	463,491	633,052
Authorized for grants under the 2016 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Common stock, reserved for future issuance	100,000	100,000

Stockholders' Equity - Schedu_2

Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Parenthetical) (Details) - shares	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Treasury stock, shares at cost	357,314	135,000

Preferred Redeemable Converti_3

Preferred Redeemable Convertible Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	Aug. 17, 2016	Jun. 30, 2012	Jun. 30, 2009	Mar. 31, 2008	Feb. 28, 2007	Feb. 28, 2006	Jun. 30, 2005	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2015
Class Of Stock [Line Items]
Outstanding convertible promissory notes and accrued interest		$ 7.1
Common stock, offering price per share								$ 76.80
Common Stock
Class Of Stock [Line Items]
Conversion of stock, shares issued									127,143
Series E Preferred Redeemable Convertible Stock
Class Of Stock [Line Items]
Preferred convertible stock, shares issued						7,984,727	7,984,727
Preferred convertible stock sold, per share						$ 1.11	$ 1.11
Gross proceeds from sale of convertible preferred stock						$ 8.8	$ 8.8
Conversion of preferred stock to common stock, conversion price								11.11
Series F Preferred Redeemable Convertible Stock
Class Of Stock [Line Items]
Preferred convertible stock, shares issued					4,734,374
Preferred convertible stock sold, per share					$ 1.30
Gross proceeds from sale of convertible preferred stock					$ 6.2
Conversion of preferred stock to common stock, conversion price								13
Series G Preferred Stock
Class Of Stock [Line Items]
Preferred convertible stock sold, per share			$ 1.30	$ 1.30
Gross proceeds from sale of convertible preferred stock			$ 4.3	$ 4.3
Preferred stock, shares issued upon conversion			463,856	6,216,607
Preferred stock, conversion price per share			$ 1.30	$ 1.04
Conversion of preferred stock to common stock, conversion price								$ 13
Senior Preferred Stock
Class Of Stock [Line Items]
Dividend rate, percentage								8.00%
Preferred convertible stock, shares outstanding								4,875,000
Percentage of outstanding preferred stock required for consent								50.00%
Firm Commitment | Common Stock
Class Of Stock [Line Items]
Aggregate proceeds from issuance of private placement								$ 15
Common stock, offering price per share								$ 76.80
Preferred Redeemable Convertible Stock
Class Of Stock [Line Items]
Preferred convertible stock, shares outstanding										23,271,702
Conversion of stock, shares issued									(23,271,702)
Preferred Redeemable Convertible Stock | IPO
Class Of Stock [Line Items]
Conversion of stock, shares converted	23,271,702
Conversion of stock, shares issued	2,327,122
Preferred stock dividends converted into common stock	1,451,631

Preferred Redeemable Converti_4

Preferred Redeemable Convertible Stock - Schedule of Preferred Redeemable Convertible Stock (Details)	12 Months Ended
	Dec. 31, 2016USD ($)shares
Class Of Stock [Line Items]
Effect of accretion to redemption value	$ 1,356,707
Conversion of warrants	$ 249,215
Preferred Redeemable Convertible Stock
Class Of Stock [Line Items]
Beginning balance, Shares | shares	23,271,702
Conversion of warrants, shares | shares	(23,271,702)
Beginning balance, Amount	$ 43,106,906
Effect of accretion to redemption value	1,356,707
Conversion of warrants	$ (44,463,613)

Stock Options - Additional Info

Stock Options - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 18, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	2,021,543	1,987,682
Weighted average grant-date fair value of options granted	$ 3.97	$ 6.02	$ 1.23
Stock options vested aggregate intrinsic value	$ 2,485,258	$ 3,596,624	$ 7,770,086
Stock options expected to vest aggregate intrinsic value	$ 993,372	$ 1,469,154	$ 4,569,243
Total grant date fair value of shares vested	2,770,008	322,804	176,597
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans	$ 2,781,062	$ 2,453,342	$ 522,818
Unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans, period for recognition	3 years
Restricted Stock | Chief Financial Officer And Chief Operating Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted common stock granted			57,475
Fair value of common stock granted, per share			$ 2
Vested percentage of common stock		100.00%
Restricted Stock Units [Member] | Board of Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted common stock granted	3,962
Fair value of common stock granted, per share	$ 12.62
Restricted stock units, vesting period description	shares vest equally on each of the anniversaries over a three-year period.
Restricted stock units, vesting period	3 years
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service period for stock options granted to employees	1 year
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service period for stock options granted to employees	4 years
Authorized for Grants under the 2016 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	463,491	633,052
Rolled from 2013 Equity Incentive Plan to 2016 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	0
Authorized for Grants under the 2013 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	0	0
Common stock authorized under equity incentive plan				1,200,000
Vested options cancellation days, after termination of employee			90 days

Stock Options - Weighted Averag

Stock Options - Weighted Average Assumptions Used in Estimating Fair Value of Stock Options (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based compensation arrangement by share-based payment award, Fair value assumptions and methodology
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility	37.60%	39.37%	41.82%
Expected term (years)	5 years 10 months 9 days	6 years 21 days	6 years 25 days
Risk-free interest rate	2.60%	1.90%	1.60%

Stock Options - Summary of Outs

Stock Options - Summary of Outstanding Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of shares, Beginning balance	1,203,627	1,040,387	756,692
Number of shares, Granted	1,009,134	471,144	359,319
Number of shares, Exercised	(341,456)	(284,455)	(58,155)
Number of shares, Expired/Forfeited	(464,256)	(23,449)	(17,469)
Number of shares, Ending balance	1,407,049	1,203,627	1,040,387	756,692
Number of shares, Vested and exercisable	504,287
Number of shares, Vested and expected to vest	1,407,049
Weighted average exercise price, Beginning balance	$ 7.06	$ 2.25	$ 2.10
Weighted average exercise price, Granted	9.94	14.72	2.60
Weighted average exercise price, Exercised	2.24	2.07	2.36
Weighted average exercise price, Expired/Forfeited	11.81	8.22	2.13
Weighted average exercise price, Ending balance	8.73	$ 7.06	$ 2.25	$ 2.10
Weighted average exercise price, Vested and exercisable	6.28
Weighted average exercise price, Vested and expected to vest	$ 8.73
Weighted average remaining contractual term	8 years 1 month 6 days	8 years 1 month 6 days	7 years 9 months 18 days	7 years 7 months 6 days
Weighted average remaining contractual term, Granted	6 years 9 months 18 days	9 years 1 month 6 days	9 years 4 months 24 days
Weighted average remaining contractual term, Exercised	1 year 3 months 18 days	5 years 2 months 12 days	3 years 6 months
Weighted average remaining contractual term, Expired/Forfeited			2 years 7 months 6 days
Weighted average remaining contractual term, Vested and exercisable	7 years
Weighted average remaining contractual term, Vested and expected to vest	8 years 1 month 6 days

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	May 02, 2018	Apr. 02, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 13, 2019	Jan. 16, 2019	Dec. 31, 2014
Mr. Selbo
Commitment And Contingencies [Line Items]
Severance amount paid in cash		$ 150,000
Mr. Charles Myers
Commitment And Contingencies [Line Items]
Severance amount paid in cash	$ 507,200
Chief Executive Officer
Commitment And Contingencies [Line Items]
Contingent Severance cost								$ 575,000
Severance cost, description			These agreements provided severance in the aggregate amount of $575,000 for termination without cause as defined in the agreements.
Minimum | Subsequent Event | James K. Sims
Commitment And Contingencies [Line Items]
Contingent Severance cost						$ 200,000
Minimum | President, Chief Financial Officer and Secretary and Senior Vice President | Subsequent Event
Commitment And Contingencies [Line Items]
Contingent Severance cost							$ 455,000
Office Space and Research Facilities Lease
Commitment And Contingencies [Line Items]
Operating leases, rent expense			$ 911,887	$ 805,271	$ 742,829
Lease agreement description			The San Diego facility lease agreement included a tenant improvement allowance which provided for the landlord to pay for tenant improvements on behalf of the Company up to $515,000. Based on the terms of this landlord incentive and involvement of the Company in the construction process, the leasehold improvements purchased under the landlord incentive were determined to be property of the Company.
Lease expiration date			Feb. 28, 2022
Office Space and Research Facilities Lease | Maximum
Commitment And Contingencies [Line Items]
Payments for tenant improvements allowance			$ 515,000

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Future Minimum Lease Payments Under Operating Leases (Detail)	Dec. 31, 2018USD ($)
Future minimum lease payment
2019	$ 933,886
2020	560,432
2021	180,423
2022	22,526
Total future minimum lease payment	$ 1,697,267

Concentration of Credit Risk -

Concentration of Credit Risk - Additional Information (Details) - Vendor	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
China
Concentration Risk [Line Items]
Number of vendors	2	2	2
Customer Concentration Risk | Net Revenue
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%
Customer Concentration Risk | Net Revenue | China
Concentration Risk [Line Items]
Concentration risk percentage	75.00%	67.00%	74.00%
Customer Concentration Risk | Trade Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%

Concentration of Credit Risk _2

Concentration of Credit Risk - Schedule of Concentration of Sales and Accounts Receivable (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Revenue
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%
Net Revenue | Customer A
Concentration Risk [Line Items]
Concentration risk percentage	36.00%	21.00%	20.00%
Net Revenue | Customer B
Concentration Risk [Line Items]
Concentration risk percentage	8.00%	13.00%	31.00%
Net Revenue | Customer C
Concentration Risk [Line Items]
Concentration risk percentage	7.00%	10.00%	8.00%
Trade Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%
Trade Accounts Receivable | Customer A
Concentration Risk [Line Items]
Concentration risk percentage	32.00%	13.00%
Trade Accounts Receivable | Customer B
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	4.00%
Trade Accounts Receivable | Customer C
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	9.00%
Trade Accounts Receivable | Customer D
Concentration Risk [Line Items]
Concentration risk percentage	8.00%	10.00%
Trade Accounts Receivable | Customer E
Concentration Risk [Line Items]
Concentration risk percentage		19.00%

Concentration of Credit Risk _3

Concentration of Credit Risk - Schedule of Revenue by Geography (Details) - Customer Concentration Risk - Net Revenue	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%
China
Concentration Risk [Line Items]
Concentration risk percentage	75.00%	67.00%	74.00%
Other Asia
Concentration Risk [Line Items]
Concentration risk percentage	5.00%	10.00%	11.00%
North America
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	18.00%	10.00%
Europe
Concentration Risk [Line Items]
Concentration risk percentage	4.00%	5.00%	5.00%

Termination Costs - Additional

Termination Costs - Additional Information (Details) - USD ($)	Jun. 30, 2018	May 02, 2018	Apr. 02, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]
Stock compensation expense				$ 2,910,070	$ 736,066	$ 298,535
Mr. Charles Myers
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash		$ 507,200
Unvested options shares		282,944
Number of monthly premiums for disability insurance		12 months
Remaining amount payable				12,875
Mr. Charles Myers | One Time Benefit
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash		$ 484,000
Mr. Charles Myers | Other Employment Benefits
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash		20,000
Mr. Selbo
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash			$ 150,000
Remaining amount payable				0
Disability Insurance Plan | Mr. Charles Myers
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash		$ 3,200
Sales and Marketing Expense
Restructuring Cost And Reserve [Line Items]
Agreement termination costs	$ 1,300,000
Sales and Marketing Expense | Mr. Selbo
Restructuring Cost And Reserve [Line Items]
Stock compensation expense			$ 44,267
General and Administrative Expense | Mr. Charles Myers
Restructuring Cost And Reserve [Line Items]
Stock compensation expense				$ 1,200,000

Employee Benefit Plan - Additio

Employee Benefit Plan - Additional Information (Detail)	Dec. 31, 2018
Postemployment Benefits [Abstract]
401(k) plan - Defined Contribution Plan, Sponsor Location [Extensible List]	country:US
401(k) plan - Defined Contribution Plan, Tax Status [Extensible List]	us-gaap:QualifiedPlanMember

Quarterly Financial Informati_3

Quarterly Financial Information (unaudited) - Summary of Quarterly Results of Operations (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 16,561,520	$ 15,786,913	$ 14,971,681	$ 13,305,098	$ 12,807,175	$ 12,448,436	$ 13,013,143	$ 11,252,417	$ 60,625,212	$ 49,521,171	$ 43,433,867
Gross Profit	6,850,134	6,865,342	6,601,521	6,194,171	5,888,332	6,003,892	6,121,524	5,288,458	26,511,168	23,302,206	19,277,075
Total operating expenses	5,730,406	6,558,122	10,250,807	7,357,840	5,418,089	5,803,260	6,248,678	4,862,979	29,897,174	22,333,006	15,824,908
Net income (loss)	$ 1,274,559	$ 437,259	$ (3,190,347)	$ (1,105,791)	$ 591,933	$ 234,353	$ (70,121)	$ 385,090	$ (2,584,320)	$ 1,141,255	$ 3,733,707
Basic net income (loss) per share	$ 0.13	$ 0.05	$ (0.34)	$ (0.12)	$ 0.06	$ 0.02	$ (0.01)	$ 0.04	$ (0.27)	$ 0.12	$ 0.65
Diluted net income (loss) per share	$ 0.13	$ 0.04	$ (0.34)	$ (0.12)	$ 0.06	$ 0.02	$ (0.01)	$ 0.04	$ (0.27)	$ 0.11	$ 0.40