Geospace Technologies (GEOS) 10-Q 3 May 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	GEOS
Entity Registrant Name	GEOSPACE TECHNOLOGIES CORP
Entity Central Index Key	0001001115
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		13,632,291

CONSOLIDATED BALANCE SHEETS (Un

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 12,765	$ 11,934
Short-term investments	748	25,471
Trade accounts receivable, net	20,634	14,323
Financing receivables	3,660	4,258
Inventories	15,525	18,812
Prepaid expenses and other current assets	2,275	1,856
Total current assets	55,607	76,654
Rental equipment, net	56,434	39,545
Property, plant and equipment, net	34,320	33,624
Non-current inventories	34,037	31,655
Goodwill	5,059	4,343
Other intangible assets, net	10,930	8,006
Deferred income tax assets, net	225	246
Non-current financing receivables, net	2,753	4,740
Prepaid income taxes	69	54
Other assets	216	213
Total assets	199,650	199,080
Current liabilities:
Accounts payable trade	7,117	4,106
Accrued expenses and other current liabilities	5,059	6,826
Deferred revenue	2,393	3,752
Income tax payable	33	51
Total current liabilities	14,602	14,735
Contingent earn-out liabilities	12,055	7,713
Deferred income tax liabilities	40	45
Total liabilities	26,697	22,493
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, 1,000,000 shares authorized, no shares issued and outstanding
Common stock, $.01 par value, 20,000,000 shares authorized, 13,632,291 and 13,600,541 shares issued and outstanding	136	136
Additional paid-in capital	87,525	86,116
Retained earnings	100,808	105,954
Accumulated other comprehensive loss	(15,516)	(15,619)
Total stockholders’ equity	172,953	176,587
Total liabilities and stockholders’ equity	$ 199,650	$ 199,080

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2019	Sep. 30, 2018
Statement Of Financial Position [Abstract]
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	13,632,291	13,600,541
Common stock, shares outstanding	13,632,291	13,600,541

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenue:
Products	$ 11,845	$ 13,910	$ 22,304	$ 27,184
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Rental	$ 14,278	$ 5,337	$ 21,694	$ 6,707
Total revenue	26,123	19,247	43,998	33,891
Cost of revenue:
Products	$ 11,246	$ 14,065	$ 22,459	$ 27,161
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Rental	$ 4,526	$ 3,183	$ 8,098	$ 5,699
Total cost of revenue	15,772	17,248	30,557	32,860
Gross profit	10,351	1,999	13,441	1,031
Operating expenses:
Selling, general and administrative	5,358	4,785	11,443	9,914
Research and development	3,898	2,430	7,069	5,588
Bad debt expense (recovery)	73	6	(30)	356
Total operating expenses	9,329	7,221	18,482	15,858
Income (loss) from operations	1,022	(5,222)	(5,041)	(14,827)
Other income (expense):
Interest expense	(23)	(127)	(57)	(191)
Interest income	180	279	452	542
Foreign exchange gains (losses), net	119	(306)	186	(349)
Other, net	(41)	(29)	(129)	(54)
Total other income (expense), net	235	(183)	452	(52)
Income (loss) before income taxes	1,257	(5,405)	(4,589)	(14,879)
Income tax expense (benefit)	550	(676)	557	(670)
Net income (loss)	$ 707	$ (4,729)	$ (5,146)	$ (14,209)
Income (loss) per common share:
Basic	$ 0.05	$ (0.36)	$ (0.38)	$ (1.07)
Diluted	$ 0.05	$ (0.36)	$ (0.38)	$ (1.07)
Weighted average common shares outstanding:
Basic	13,401,135	13,264,710	13,369,932	13,233,205
Diluted	13,557,185	13,264,710	13,369,932	13,233,205

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 707	$ (4,729)	$ (5,146)	$ (14,209)
Other comprehensive income (loss):
Change in unrealized gains (losses) on available-for-sale securities, net of tax	19	(38)	83	(89)
Foreign currency translation adjustments	238	1,039	20	834
Total other comprehensive income	257	1,001	103	745
Total comprehensive income (loss)	$ 964	$ (3,728)	$ (5,043)	$ (13,464)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Sep. 30, 2017	$ 194,803	$ 134	$ 83,733	$ 125,166	$ (14,230)
Beginning Balance, Shares at Sep. 30, 2017		13,438,316
Net income (loss)	(9,480)			(9,480)
Other comprehensive income (loss)	(256)				(256)
Issuance of restricted stock		$ 2	(2)
Issuance of restricted stock, Shares		138,650
Forfeiture of restricted stock, Shares		(16,675)
Stock-based compensation	826		826
Ending Balance at Dec. 31, 2017	185,893	$ 136	84,557	115,686	(14,486)
Ending Balance, Shares at Dec. 31, 2017		13,560,291
Beginning Balance at Sep. 30, 2017	194,803	$ 134	83,733	125,166	(14,230)
Beginning Balance, Shares at Sep. 30, 2017		13,438,316
Net income (loss)	(14,209)
Other comprehensive income (loss)	745
Ending Balance at Mar. 31, 2018	182,711	$ 136	85,103	110,957	(13,485)
Ending Balance, Shares at Mar. 31, 2018		13,578,916
Beginning Balance at Dec. 31, 2017	185,893	$ 136	84,557	115,686	(14,486)
Beginning Balance, Shares at Dec. 31, 2017		13,560,291
Net income (loss)	(4,729)			(4,729)
Other comprehensive income (loss)	1,001				1,001
Issuance of restricted stock, Shares		16,800
Forfeiture of restricted stock, Shares		(1,375)
Issuance of common stock pursuant to the exercise of stock options	28		28
Issuance of common stock pursuant to the exercise of stock options, Shares		3,200
Stock-based compensation	518		518
Ending Balance at Mar. 31, 2018	182,711	$ 136	85,103	110,957	(13,485)
Ending Balance, Shares at Mar. 31, 2018		13,578,916
Beginning Balance at Sep. 30, 2018	$ 176,587	$ 136	86,116	105,954	(15,619)
Beginning Balance, Shares at Sep. 30, 2018	13,600,541	13,600,541
Net income (loss)	$ (5,853)			(5,853)
Other comprehensive income (loss)	(154)				(154)
Issuance of restricted stock, Shares		8,000
Forfeiture of restricted stock, Shares		(250)
Issuance of common stock pursuant to the exercise of stock options	215		215
Issuance of common stock pursuant to the exercise of stock options, Shares		24,500
Stock-based compensation	602		602
Ending Balance at Dec. 31, 2018	171,397	$ 136	86,933	100,101	(15,773)
Ending Balance, Shares at Dec. 31, 2018		13,632,791
Beginning Balance at Sep. 30, 2018	$ 176,587	$ 136	86,116	105,954	(15,619)
Beginning Balance, Shares at Sep. 30, 2018	13,600,541	13,600,541
Net income (loss)	$ (5,146)
Other comprehensive income (loss)	103
Ending Balance at Mar. 31, 2019	$ 172,953	$ 136	87,525	100,808	(15,516)
Ending Balance, Shares at Mar. 31, 2019	13,632,291	13,632,291
Beginning Balance at Dec. 31, 2018	$ 171,397	$ 136	86,933	100,101	(15,773)
Beginning Balance, Shares at Dec. 31, 2018		13,632,791
Net income (loss)	707			707
Other comprehensive income (loss)	257				257
Forfeiture of restricted stock, Shares		(1,000)
Issuance of common stock pursuant to the exercise of stock options, Shares		500
Stock-based compensation	592		592
Ending Balance at Mar. 31, 2019	$ 172,953	$ 136	$ 87,525	$ 100,808	$ (15,516)
Ending Balance, Shares at Mar. 31, 2019	13,632,291	13,632,291

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (5,146,000)	$ (14,209,000)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Deferred income tax benefit	(14,000)	(40,000)
Rental equipment depreciation	6,121,000	4,519,000
Property, plant and equipment depreciation	2,003,000	2,105,000
Amortization of intangible assets	795,000	0
Accretion of discounts on short-term investments	(9,000)	24,000
Stock-based compensation expense	1,194,000	1,344,000
Bad debt expense (recovery)	(30,000)	356,000
Inventory obsolescence expense	2,401,000	3,297,000
Gross profit from sale of used rental equipment	(200,000)	(4,187,000)
Gain on disposal of property, plant and equipment		(25,000)
Realized loss on short-term investments	67,000	1,000
Effects of changes in operating assets and liabilities:
Trade accounts receivable	(5,806,000)	(2,943,000)
Income tax receivable		(701,000)
Inventories	(3,695,000)	(4,613,000)
Prepaid expenses and other current assets	(998,000)	179,000
Prepaid income taxes	(23,000)	49,000
Accounts payable trade	3,018,000	2,320,000
Accrued expenses and other	(1,218,000)	89,000
Deferred revenue	(1,349,000)	60,000
Income tax payable	(15,000)
Net cash used in operating activities	(2,904,000)	(12,375,000)
Cash flows from investing activities:
Purchase of property, plant and equipment	(962,000)	(495,000)
Proceeds from the sale of property, plant and equipment		200,000
Investment in rental equipment	(20,420,000)	(1,643,000)
Proceeds from the sale of used rental equipment	1,646,000	3,904,000
Purchases of short-term investments		(3,755,000)
Proceeds from the sale of short-term investments	24,856,000	13,321,000
Business acquisition	(1,819,000)
Payments for damages related to insurance claim	(616,000)
Proceeds from insurance claim	1,166,000
Net cash provided by investing activities	3,851,000	11,532,000
Cash flows from financing activities:
Proceeds from the exercise of stock options	215,000	19,000
Net cash provided by financing activities	215,000	19,000
Effect of exchange rate changes on cash	(331,000)	(89,000)
Increase (decrease) in cash and cash equivalents	831,000	(913,000)
Cash and cash equivalents, beginning of fiscal year	11,934,000	15,092,000
Cash and cash equivalents, end of fiscal period	$ 12,765,000	$ 14,179,000

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Significant Accounting Policies	1. Significant Accounting Policies Basis of Presentation The consolidated balance sheet of Geospace Technologies Corporation and its subsidiaries (the “Company”) at September 30, 2018 was derived from the Company’s audited consolidated financial statements at that date. The consolidated balance sheet at March 31, 2019 and the consolidated statements of operations, comprehensive income (loss), stockholders’ equity and cash flows for the three and six months ended March 31, 2019 and 2018 were prepared by the Company without audit. In the opinion of management, all adjustments, consisting of normal recurring adjustments, necessary to present fairly the consolidated financial position, results of operations and cash flows were made. The results of operations for the three and six months ended March 31, 2019 are not necessarily indicative of the operating results for a full year or of future operations. Certain information and footnote disclosures normally included in financial statements presented in accordance with accounting principles generally accepted in the United States of America were omitted pursuant to the rules of the Securities and Exchange Commission. The accompanying consolidated financial statements should be read in conjunction with the financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the Company’s fiscal year ended September 30, 2018. Reclassifications Certain amounts previously presented in the consolidated financial statements have been reclassified to conform to the current year presentation. Such reclassifications had no effect on previously reported net loss, stockholders’ equity or cash flows. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company considers many factors in selecting appropriate operational and financial accounting policies and controls, and in developing the estimates and assumptions that are used in the preparation of these consolidated financial statements. The Company continually evaluates its estimates, including those related to bad debt reserves, inventory obsolescence reserves, self-insurance reserves, product warranty reserves, impairment of long-lived assets and deferred income tax assets. The Company bases its estimates on historical experience and various other factors that are believed to be reasonable under the circumstances. Actual results may differ from these estimates under different conditions or assumptions. Cash and Cash Equivalents The Company considers all highly liquid investments purchased with an original or remaining maturity at the time of purchase of three months or less to be cash equivalents. At March 31, 2019, cash and cash equivalents included $7.5 million held by the Company’s foreign subsidiaries and branch offices. If the Company were to repatriate the cash held by its foreign subsidiaries, it would be required to accrue and pay taxes on any amount repatriated under rates enacted by The Tax Cuts and Jobs Act (“2017 Tax Act”). Recently Adopted Accounting Pronouncements In November 2016, the Financial Accounting Standards Board (“FASB”) issued guidance which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance was adopted by the Company in its first quarter of fiscal year 2019. The adoption of this guidance had no effect on the Company’s consolidated financial statements since it currently holds no restricted cash balances. In May 2014, the FASB issued guidance requiring entities to recognize revenue from contracts with customers by applying a five-step model in accordance with the core principle to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, this guidance specifies the accounting for some costs to obtain or fulfill a contract with a customer and expands disclosure requirements for revenue recognition. This new standard supersedes existing revenue recognition guidance and requires changes to the revenue recognition process, financial statement presentation and footnote disclosures. The Company adopted this standard on October 1, 2018 using the modified retrospective method. The adoption of this standard did not result in a cumulative adjustment as of October 1, 2018 nor did it have any impact on the Company’s consolidated financial statements. Recently Issued Accounting Pronouncements In June 2018, the FASB issued guidance expanding the scope of ASC Topic 718, Compensation - Stock Compensation In August 2018, the FASB issued guidance requiring certain existing disclosure requirements in ASC Topic 820, Fair Value Measurements and Disclosures In January 2017, the FASB issued guidance simplifying the current two-step goodwill impairment test by eliminating Step 2 of the test. The guidance requires a one-step impairment test in which an entity compares the fair value of a reporting unit with its carrying amount and recognizes an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, if any. This guidance is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years, and should be applied on a prospective basis. Early adoption is permitted for the interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company is currently evaluating the impact of the adoption of this guidance on its consolidated financial statements. In June 2016, the FASB issued guidance surrounding credit losses for financial instruments that replaces the incurred loss impairment methodology in generally accepted accounting principles (“GAAP”). The new impairment model requires immediate recognition of estimated credit losses expected to occur for most financial assets and certain other financial instruments. For available-for-sale debt securities with unrealized losses, credit losses will be recognized as allowances rather than reductions in the amortized cost of the securities. The standard is effective for fiscal years reporting periods beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption for a fiscal year beginning after December 15, 2018 is permitted. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first effective reporting period. The Company expects to adopt this standard during the first quarter of its fiscal year ending September 30, 2021 and is currently evaluating the impact of this new guidance on its consolidated financial statements. In February 2016, the FASB issued guidance requiring a lessee to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement and presentation of expense and cash flows arising from a lease by a lessee primarily will depend on its classification of the lease as a finance or operating lease. However, unlike current GAAP, which requires only capital leases to be recognized on the balance sheet, the new guidance will also require operating leases of the lessee to be recognized on the balance sheet if the operating lease term is more than 12 months. The guidance also requires disclosures to help investors and other financial statement users to better understand the amount, timing and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. The guidance is effective for fiscal years, and interim reporting periods therein, beginning after December 15, 2018 and is to be applied using the modified retrospective approach. The Company expects to adopt this standard in its first quarter of its fiscal year ending September 30, 2020. Effective May 1, 2019, the Company will be a lessee under an office lease agreement with a term longer than one year. The Company is routinely a lessor in its rental contracts with customers. The minimum rental term of these contracts is generally less than one year, and the Company expects these contracts will be treated as operating leases under the new guidance; however, the Company has not completed a detailed review of its various lease and rental arrangements, and these conclusions are subject to change.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Mar. 31, 2019
Revenue From Contract With Customer [Abstract]
Revenue Recognition	2. Revenue Recognition On October 1, 2018, the Company adopted ASC Topic 606, Revenue from Contracts with Customers. Under the new standard, the Company recognizes revenue when performance of contractual obligations are satisfied, generally when control of the promised goods or services is transferred to its customers, in an amount that reflects the consideration it expects to be entitled to in exchange for those goods or services. The Company primarily derives product revenue from the sale of its manufactured products. Revenue from these product sales, including the sale of used rental equipment, is recognized when all of the following have occurred: (i) title passes to the customer, (ii) the customer assumes the risks and rewards of ownership, (iii) the product sales price has been determined, (iv) collectability of the sales price is reasonably assured, and (v) product delivery occurs as directed by the customer. The Company’s products are generally sold without any customer acceptance provisions, and the Company’s standard terms of sale do not allow customers to return products for credit. Revenue from engineering services is recognized as services are rendered over the duration of a project, or as billed on a per hour basis. Field service revenue is recognized when services are rendered and is generally priced on a per day rate. The Company also generates revenue from short-term rentals under operating leases of its manufactured products. Rental revenue is recognized as earned over the rental period. Rentals of the Company’s equipment generally range from daily rentals to minimum rental periods of up to six months or longer. The Company has determined that the new standard does not apply to rental contracts, which are within the scope of other revenue recognition accounting standards. The cumulative effect of the changes made to the Company’s consolidated balance sheet as of October 1, 2018 resulting from the adoption of the new standard was not material and did not impact beginning retained earnings. The impact on the timing of sales and services for the six months ended March 31, 2019 resulting from the application of the new standard was not material. As permissible under the new standard, sales taxes and transaction-based taxes are excluded from revenue. The Company does not disclose the value of unsatisfied performance obligations for contracts with an original expected duration of one year or less. Additionally, the Company expenses costs incurred to obtain contracts when incurred because the amortization period would have been one year or less. These costs are recorded in selling, general and administrative expenses. At March 31, 2019 and September 30, 2018 the Company had deferred contract liabilities of $0.1 million and $0.2 million, respectively, included as a component of deferred revenue. The Company had deferred contract costs of $35,000 and $27,000 at March 31, 2019 and September 30, 2018, respectively, included as a component of prepaid expenses and other current assets. During the three and six months ended March 31, 2019, the Company recognized cost of revenue of $0 and $8,000, respectively, from deferred contract costs. For each of the Company’s operating segments, the following table presents revenue from the sale of products and services under contracts with customers. The table excludes all revenue earned from rental contracts (in thousands): Three Months Ended Six Months Ended March 31, 2019 March 31, 2018 March 31, 2019 March 31, 2018 Oil and Gas Markets Traditional exploration product revenue $ 3,261 $ 2,490 $ 5,987 $ 6,089 Wireless exploration product revenue 310 1,558 454 4,181 Reservoir product revenue 994 2,060 1,882 2,678 Total revenue 4,565 6,108 8,323 12,948 Adjacent Markets Industrial product revenue 4,120 4,711 7,682 8,387 Imaging product revenue 3,114 3,091 6,165 5,849 Total revenue 7,234 7,802 13,847 14,236 Emerging Markets Revenue 46 — 134 — Total $ 11,845 $ 13,910 $ 22,304 $ 27,184 See note 13 for more information on the Company’s operating segments. For each of the geographic areas where the Company operates, the following table presents revenue from the sale of products and services under contracts with customers. The table excludes all revenue earned from rental contracts (in thousands): Three Months Ended Six Months Ended March 31, 2019 March 31, 2018 March 31, 2019 March 31, 2018 Asia $ 1,510 $ 1,253 $ 3,068 $ 2,259 Canada 342 345 630 710 Europe 1,170 917 2,085 4,336 United States 8,265 11,338 14,875 19,361 Other 558 57 1,646 518 Total $ 11,845 $ 13,910 $ 22,304 $ 27,184 Revenue is attributable to countries based on the ultimate destination of the product sold, if known. If the ultimate destination is not known, revenue is attributable to countries based on the geographic location of the initial shipment.

Business Acquisition

Business Acquisition	6 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Business Acquisition	3. Business Acquisition On November 13, 2018, the Company acquired all of the intellectual property and related assets of the OptoSeis ® In connection with the OptoSeis acquisition, the Company recorded goodwill of $0.7 million (deductible for tax purposes), other intangible assets of $3.7 million, fixed assets of $1.7 million and has established an initial contingent earn-out liability of $4.3 million. The contingent earn-out payments will be derived from certain eligible revenue generated during the five-and-a-half year earn-out period. Legal costs of $0.2 million related to the OptoSeis acquisition are included in selling, general and administrative expenses. Due to the limited amount of time since the acquisition transaction, the valuation of the OptoSeis assets and liabilities and the determination of the fair value of the contingent consideration are considered by the Company as preliminary and subject to change. During the three months ended March 31, 2019, the estimated fair value of the acquired OptoSeis assets changed, including a $1.7 million addition to machinery and equipment, which was offset by a $0.9 million decrease in goodwill and a $0.8 million decrease in other intangible assets.

Short-term Investments

Short-term Investments	6 Months Ended
	Mar. 31, 2019
Investments Debt And Equity Securities [Abstract]
Short-term Investments	4. Short-term Investments As of March 31, 2019 (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Estimated Fair Value Short-term investments: Government bonds $ 747 $ 1 $ — $ 748 As of September 30, 2018 (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Estimated Fair Value Short-term investments: Corporate bonds $ 17,851 $ — $ (60 ) $ 17,791 Government bonds 7,702 — (22 ) 7,680 Total $ 25,553 $ — $ (82 ) $ 25,471 The Company’s short-term investments have contractual maturities in February 2020.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Mar. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	5. Derivative Financial Instruments At March 31, 2019 and September 30, 2018, the Company’s Canadian subsidiary had CAN$14.3 million and CAD$20.4 million, respectively, of Canadian dollar denominated intercompany accounts payable owed to one of the Company’s U.S subsidiaries. In order to mitigate its exposure to movements in foreign currency rates between the U.S. dollar and Canadian dollar, the Company routinely enters into foreign currency forward contracts to hedge a portion of its exposure to changes in the value of the Canadian dollar. On March 29, 2019, the Company entered into a CAD$10.0 million 90-day hedge contract with a United States bank to reduce the impact on cash flows from movements in the Canadian dollar/U.S. dollar currency exchange rate, but has not been designated as a hedge for accounting purposes. The following table summarizes the gross fair value of all derivative instruments, which are not designated as hedging instruments and their location in the consolidated balance sheets (in thousands). Derivative Instrument Location March 31, 2019 September 30, 2018 Foreign Currency Forward Contracts Accrued Expenses and Other Current Liabilities $ 41 $ 270 The following table summarizes the Company’s realized gains on derivative instruments included in the consolidated statements of operations for the three and six months ended March 31, 2019 and 2018 (in thousands): Three Months Ended Six Months Ended Derivative Instrument Location March 31, 2019 March 31, 2018 March 31, 2019 March 31, 2018 Foreign Currency Forward Contracts Other Income (Expense) $ 217 $ 733 $ 639 $ 575

Trade Accounts and Financing Re

Trade Accounts and Financing Receivables	6 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Trade Accounts and Financing Receivables	6. Trade Accounts and Financing Receivables Trade accounts receivable, net are reflected in the following table (in thousands): March 31, 2019 September 30, 2018 Trade accounts receivable $ 21,314 $ 15,776 Allowance for doubtful accounts (680 ) (1,453 ) $ 20,634 $ 14,323 The allowance for doubtful accounts represents the Company’s best estimate of probable credit losses. The Company determines the allowance based upon historical experience and a current review of its accounts receivable balances. Accounts receivable balances are charged off against the allowance whenever it is probable that the receivable balance will not be recoverable. Trade accounts receivable at March 31, 2019 includes $8.2 million due from a single customer, of which $6.2 million was collected in April 2019. Financing receivables are reflected in the following table (in thousands): March 31, 2019 September 30, 2018 Promissory notes $ 4,730 $ 5,646 Sales-type lease 4,032 5,533 Total financing receivables 8,762 11,179 Unearned income: Promissory notes (95 ) (95 ) Sales-type lease (150 ) (237 ) Total unearned income (245 ) (332 ) Total financing receivables, net of unearned income 8,517 10,847 Allowance for doubtful promissory notes (2,104 ) (1,849 ) Less current portion (3,660 ) (4,258 ) Non-current financing receivables $ 2,753 $ 4,740

Inventories

Inventories	6 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventories	7. Inventories Inventories consist of the following (in thousands): March 31, 2019 September 30, 2018 Finished goods $ 18,750 $ 18,802 Work in process 3,745 7,926 Raw material 58,570 54,290 Obsolescence reserve (31,503 ) (30,551 ) 49,562 50,467 Less current portion (15,525 ) (18,812 ) Non-current portion $ 34,037 $ 31,655 During the six months ended March 31, 2019 and 2018, the Company made non-cash inventory transfers of $1.8 million and $8.1million, respectively, to rental equipment. Raw materials include semi-finished goods and component parts totaled approximately $28.5 million and $29.0 million at March 31, 2019 and September 30, 2018, respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	8. Goodwill and Other Intangible Assets In connection with the acquisition of all of the intellectual property and related assets of the OptoSeis fiber optic sensing technology business from PGS Americas, Inc. in November 2018, the Company recorded goodwill of $0.7 million and other intangible assets of $3.7 million. As a result of this acquisition and the acquisition of Quantum Technology Sciences (“Quantum”) in July 2018, the Company’s consolidated intangible assets consisted of the following (in thousands): Weighted- Average Remaining Useful Lives (in years) March 31, 2019 September 30, 2018 Goodwill $ 5,059 $ 4,343 Other intangible assets: Developed technology 17.4 5,919 4,200 Customer relationships 3.4 3,900 2,500 Trade names 4.5 1,930 1,400 Non-compete agreements 3.5 170 100 Total other intangible assets 10.5 11,919 8,200 Accumulated amortization (989 ) (194 ) $ 10,930 $ 8,006 Intangible assets amortization expense was $0.8 million for the six months ended March 31, 2019. The Company had no intangible asset amortization expense for the six months ended March 31, 2018. As of March 31, 2019, future estimated amortization expense of other intangible assets is as follows (in thousands): For fiscal years ending September 30, 2019 $ 866 2020 1,732 2021 1,732 2022 1,624 2023 714 Thereafter 4,262 $ 10,930

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Mar. 31, 2019
Stockholders Equity Note [Abstract]
Accumulated Other Comprehensive Loss	9. Accumulated Other Comprehensive Loss Accumulated other comprehensive loss consisted of the following (in thousands): Unrealized Gain (Loss) on Available-for-Sale Securities Foreign Currency Translation Adjustments Totals Balance at October 1, 2018 $ (82 ) $ (15,537 ) $ (15,619 ) Changes in unrealized gain on available-for-sale securities, net of tax 83 — 83 Foreign currency translation adjustments — 20 20 Balance at March 31, 2019 $ 1 $ (15,517 ) $ (15,516 )

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	10. Stock-Based Compensation During the six months ended March 31, 2019, the Company issued 8,000 shares of restricted stock awards (“RSAs”) under its 2014 Long Term Incentive Plan, as amended (the “Plan”). The weighted average grant date fair value of each RSA was $14.59 per share. The total grant date fair value of all RSAs issued was $0.1 million, which will be charged to expense over the next four years as the RSA vesting restrictions lapse. Compensation expense for the RSAs was determined based on the closing market price of the Company’s stock on the date of grant applied to the total number of shares that are anticipated to fully vest. Recipients of RSAs are entitled to vote such shares and are entitled to any dividends paid. As of March 31, 2019, the Company had unrecognized compensation expense of $3.1 million relating to RSAs that is expected to be recognized over a weighted average period of 2.3 years. During the six months ended March 31, 2019, the Company issued 161,800 restricted stock units (“RSUs”) under the Plan. The RSUs issued include both time-based and performance-based vesting provisions. The weighted average grant date fair value of each RSU was $15.11 per unit. The grant date fair value of the RSUs was $2.4 million, which will be charged to expense over the next four years as the restrictions lapse. Compensation expense for the RSUs was determined based on the closing market price of the Company’s stock on the date of grant applied to the total number of units that are anticipated to fully vest. Each RSU represents a contingent right to receive one share of the Company’s common stock upon vesting. As of March 31, 2019, the Company had unrecognized compensation expense of $2.2 million relating to RSUs that is expected to be recognized over a weighted average period of 3.7 years. As of March 31, 2019, the Company had $35,000 of unrecognized compensation expense related to nonqualified stock option awards that is expected to be recognized over a weighted average period of 0.6 years. As of March 31, 2019, 226,787 RSAs, 161,300 RSUs and 165,600 nonqualified stock options were unvested and outstanding.

Income (Loss) Per Common Share

Income (Loss) Per Common Share	6 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Income (Loss) Per Common Share	11. Income (Loss) Per Common Share The Company applies the two-class method in calculating per share data. The following table summarizes the calculation of net income (loss) and weighted average common shares and common equivalent shares outstanding for purposes of the computation of loss per share (in thousands, except share and per share data): Three Months Ended Six Months Ended March 31, 2019 March 31, 2018 March 31, 2019 March 31, 2018 Net income (loss) $ 707 $ (4,729 ) $ (5,146 ) $ (14,209 ) Less: Income (loss) allocable to unvested restricted stock (12 ) — — — Income (loss) attributable to common shareholders for diluted earnings per share $ 695 $ (4,729 ) $ (5,146 ) $ (14,209 ) Weighted average number of common share equivalents: Common shares used in basic income (loss) per share 13,401,135 13,264,710 13,369,932 13,233,205 Common share equivalents outstanding related to stock options and RSUs 156,050 — — — Total weighted average common shares and common share equivalents used in diluted income (loss) per share 13,557,185 13,264,710 13,369,932 13,233,205 Income (loss) per share: Basic $ 0.05 $ (0.36 ) $ (0.38 ) $ (1.07 ) Diluted $ 0.05 $ (0.36 ) $ (0.38 ) $ (1.07 ) For the calculation of diluted loss per share for the six months ended March 31, 2019, 163,800 stock options and 161,300 non-vested RSUs were excluded in the calculation of weighted average shares outstanding since their impact on diluted loss per share was antidilutive. For the calculation of diluted loss per share for the three and six months ended March 31, 2018, 194,600 stock options and zero-non vested RSUs were excluded in the calculation of weighted average shares outstanding since their impact on diluted loss per share was antidilutive.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Mar. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	12. Commitments and Contingencies Contingent Earn-out Liabilities The Company established an initial earn-out liability of $7.7 million in connection with its July 2018 acquisition of Quantum. The contingent earn-out payments, if any, which at the Company’s option may be paid in the form of cash or Company stock, will be derived from eligible revenue that may be generated by Quantum during a four-year earn-out period. The maximum amount of contingent payments is $23.5 million over the earn-out period. The fair value of the contingent earn-out liability has not significantly changed since September 30, 2018. For the recent acquisition of the intellectual property and related assets of the OptoSeis fiber optic sensing technology in November 2018, the Company established an initial earn-out liability of $4.3 million. The contingent earn-out payments, if any, will be derived from eligible revenue generated during a five-and-half year earn-out period. The maximum amount of contingent payments is $23.2 million over the earn-out period. The Company reviews and accesses the fair value of its contingent earn-out liabilities on a quarterly basis. The fair value of its contingent earn-out liabilities has not changed. Legal Proceedings The Company is involved in various pending legal actions in the ordinary course of its business. Management is unable to predict the ultimate outcome of these actions, because of the inherent uncertainty such actions. However, management believes that the most probable, ultimate resolution of these pending matters will not have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows.

Segment Information

Segment Information	6 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment Information	13. Segment Information The Company reports and evaluates financial information for three operating segments: Oil and Gas Markets, Adjacent Markets and Emerging Markets. The Oil and Gas Markets segment products include wireless seismic data acquisition systems, reservoir characterization products and services, and traditional seismic exploration products such as geophones, hydrophones, leader wire, connectors, cables, marine streamer retrieval and steering devices and various other seismic products. The Adjacent Markets segment products include graphic imaging equipment, water meter products, offshore cables, and seismic sensors used for vibration monitoring and geotechnical applications such as mine safety applications and earthquake detection. The Emerging Markets segment was added in conjunction with the Company’s acquisition of Quantum, which designs and markets seismic products targeted at the border and perimeter security markets. The following table summarizes the Company’s segment information (in thousands): Three Months Ended Six Months Ended March 31, 2019 March 31, 2018 March 31, 2019 March 31, 2018 Revenue: Oil and Gas Markets $ 18,669 $ 11,287 $ 29,673 $ 19,326 Adjacent Markets 7,259 7,826 13,894 14,280 Emerging Markets 46 — 134 — Corporate 149 134 297 285 Total $ 26,123 $ 19,247 $ 43,998 $ 33,891 Income (loss) from operations: Oil and Gas Markets $ 3,332 $ (3,757 ) $ 731 $ (11,430 ) Adjacent Markets 1,651 1,384 2,633 2,413 Emerging Markets (1,180 ) — (2,372 ) — Corporate (2,781 ) (2,849 ) (6,033 ) (5,810 ) Total $ 1,022 $ (5,222 ) $ (5,041 ) $ (14,827 )

Income Taxes

Income Taxes	6 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	14. Income Taxes The 2017 Tax Act was enacted in December 2017. The 2017 Tax Act, among other things, reduces the U.S. federal corporate tax rate from 35% to 21%, effective January 1, 2018, creates new taxes on certain foreign earnings and may require companies to pay a one-time transition tax on undistributed earnings of certain foreign subsidiaries that were previously tax deferred. The Company is not required to pay a one-time transition tax on earnings of our foreign subsidiaries since the Company had accumulated foreign losses on a consolidated basis. As a result of the 2017 Tax Act, during the six months ended March 31, 2018, the Company revalued its U.S. deferred tax assets based on the new U.S. federal tax rate of 21%, which resulted in a reduction to its deferred tax assets of approximately $8.1 million. The reduction in deferred tax assets was completely offset by a like reduction to the valuation allowance. Consolidated income tax expense for the three months ended March 31, 2019 was $0.6 million compared to a tax benefit of $0.7 million for corresponding period of the prior fiscal year. Consolidated income tax expense for the six months ended March 31, 2019 was $0.6 million compared to a tax benefit of $0.7 million for corresponding period of the prior fiscal year. The $0.6 million tax expense for both periods of fiscal year 2019 primarily reflects foreign withholding tax on rental income earned in Nigeria during the three months ended March 31, 2019. The income tax benefit for both periods of fiscal year 2018 reflects a $0.7 million tax refund resulting from the filing of an amended U.S. tax return in the three months ended March 31, 2018. The Company is currently unable to record any tax benefits for its tax losses in the U.S. and Canada due to the uncertainty surrounding its ability to utilize such losses in the future to offset taxable income.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	6 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated balance sheet of Geospace Technologies Corporation and its subsidiaries (the “Company”) at September 30, 2018 was derived from the Company’s audited consolidated financial statements at that date. The consolidated balance sheet at March 31, 2019 and the consolidated statements of operations, comprehensive income (loss), stockholders’ equity and cash flows for the three and six months ended March 31, 2019 and 2018 were prepared by the Company without audit. In the opinion of management, all adjustments, consisting of normal recurring adjustments, necessary to present fairly the consolidated financial position, results of operations and cash flows were made. The results of operations for the three and six months ended March 31, 2019 are not necessarily indicative of the operating results for a full year or of future operations. Certain information and footnote disclosures normally included in financial statements presented in accordance with accounting principles generally accepted in the United States of America were omitted pursuant to the rules of the Securities and Exchange Commission. The accompanying consolidated financial statements should be read in conjunction with the financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the Company’s fiscal year ended September 30, 2018.
Reclassifications	Reclassifications Certain amounts previously presented in the consolidated financial statements have been reclassified to conform to the current year presentation. Such reclassifications had no effect on previously reported net loss, stockholders’ equity or cash flows.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company considers many factors in selecting appropriate operational and financial accounting policies and controls, and in developing the estimates and assumptions that are used in the preparation of these consolidated financial statements. The Company continually evaluates its estimates, including those related to bad debt reserves, inventory obsolescence reserves, self-insurance reserves, product warranty reserves, impairment of long-lived assets and deferred income tax assets. The Company bases its estimates on historical experience and various other factors that are believed to be reasonable under the circumstances. Actual results may differ from these estimates under different conditions or assumptions.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments purchased with an original or remaining maturity at the time of purchase of three months or less to be cash equivalents. At March 31, 2019, cash and cash equivalents included $7.5 million held by the Company’s foreign subsidiaries and branch offices. If the Company were to repatriate the cash held by its foreign subsidiaries, it would be required to accrue and pay taxes on any amount repatriated under rates enacted by The Tax Cuts and Jobs Act (“2017 Tax Act”).
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In November 2016, the Financial Accounting Standards Board (“FASB”) issued guidance which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance was adopted by the Company in its first quarter of fiscal year 2019. The adoption of this guidance had no effect on the Company’s consolidated financial statements since it currently holds no restricted cash balances. In May 2014, the FASB issued guidance requiring entities to recognize revenue from contracts with customers by applying a five-step model in accordance with the core principle to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, this guidance specifies the accounting for some costs to obtain or fulfill a contract with a customer and expands disclosure requirements for revenue recognition. This new standard supersedes existing revenue recognition guidance and requires changes to the revenue recognition process, financial statement presentation and footnote disclosures. The Company adopted this standard on October 1, 2018 using the modified retrospective method. The adoption of this standard did not result in a cumulative adjustment as of October 1, 2018 nor did it have any impact on the Company’s consolidated financial statements.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In June 2018, the FASB issued guidance expanding the scope of ASC Topic 718, Compensation - Stock Compensation In August 2018, the FASB issued guidance requiring certain existing disclosure requirements in ASC Topic 820, Fair Value Measurements and Disclosures In January 2017, the FASB issued guidance simplifying the current two-step goodwill impairment test by eliminating Step 2 of the test. The guidance requires a one-step impairment test in which an entity compares the fair value of a reporting unit with its carrying amount and recognizes an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, if any. This guidance is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years, and should be applied on a prospective basis. Early adoption is permitted for the interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company is currently evaluating the impact of the adoption of this guidance on its consolidated financial statements. In June 2016, the FASB issued guidance surrounding credit losses for financial instruments that replaces the incurred loss impairment methodology in generally accepted accounting principles (“GAAP”). The new impairment model requires immediate recognition of estimated credit losses expected to occur for most financial assets and certain other financial instruments. For available-for-sale debt securities with unrealized losses, credit losses will be recognized as allowances rather than reductions in the amortized cost of the securities. The standard is effective for fiscal years reporting periods beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption for a fiscal year beginning after December 15, 2018 is permitted. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first effective reporting period. The Company expects to adopt this standard during the first quarter of its fiscal year ending September 30, 2021 and is currently evaluating the impact of this new guidance on its consolidated financial statements. In February 2016, the FASB issued guidance requiring a lessee to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement and presentation of expense and cash flows arising from a lease by a lessee primarily will depend on its classification of the lease as a finance or operating lease. However, unlike current GAAP, which requires only capital leases to be recognized on the balance sheet, the new guidance will also require operating leases of the lessee to be recognized on the balance sheet if the operating lease term is more than 12 months. The guidance also requires disclosures to help investors and other financial statement users to better understand the amount, timing and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. The guidance is effective for fiscal years, and interim reporting periods therein, beginning after December 15, 2018 and is to be applied using the modified retrospective approach. The Company expects to adopt this standard in its first quarter of its fiscal year ending September 30, 2020. Effective May 1, 2019, the Company will be a lessee under an office lease agreement with a term longer than one year. The Company is routinely a lessor in its rental contracts with customers. The minimum rental term of these contracts is generally less than one year, and the Company expects these contracts will be treated as operating leases under the new guidance; however, the Company has not completed a detailed review of its various lease and rental arrangements, and these conclusions are subject to change.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Mar. 31, 2019
Revenue From Contract With Customer [Abstract]
Summary of Revenue from the Sale of Products and Services Under Contracts with Customers Excludes All Revenue Earned from Rental Contracts by Operating Segments	For each of the Company’s operating segments, the following table presents revenue from the sale of products and services under contracts with customers. The table excludes all revenue earned from rental contracts (in thousands): Three Months Ended Six Months Ended March 31, 2019 March 31, 2018 March 31, 2019 March 31, 2018 Oil and Gas Markets Traditional exploration product revenue $ 3,261 $ 2,490 $ 5,987 $ 6,089 Wireless exploration product revenue 310 1,558 454 4,181 Reservoir product revenue 994 2,060 1,882 2,678 Total revenue 4,565 6,108 8,323 12,948 Adjacent Markets Industrial product revenue 4,120 4,711 7,682 8,387 Imaging product revenue 3,114 3,091 6,165 5,849 Total revenue 7,234 7,802 13,847 14,236 Emerging Markets Revenue 46 — 134 — Total $ 11,845 $ 13,910 $ 22,304 $ 27,184
Summary of Revenue from the Sale of Products and Services Under Contracts with Customers Excludes All Revenue Earned from Rental Contracts by Geographic Areas	For each of the geographic areas where the Company operates, the following table presents revenue from the sale of products and services under contracts with customers. The table excludes all revenue earned from rental contracts (in thousands): Three Months Ended Six Months Ended March 31, 2019 March 31, 2018 March 31, 2019 March 31, 2018 Asia $ 1,510 $ 1,253 $ 3,068 $ 2,259 Canada 342 345 630 710 Europe 1,170 917 2,085 4,336 United States 8,265 11,338 14,875 19,361 Other 558 57 1,646 518 Total $ 11,845 $ 13,910 $ 22,304 $ 27,184

Short-term Investments (Tables)

Short-term Investments (Tables)	6 Months Ended
	Mar. 31, 2019
Investments Debt And Equity Securities [Abstract]
Short-term Investments	As of March 31, 2019 (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Estimated Fair Value Short-term investments: Government bonds $ 747 $ 1 $ — $ 748 As of September 30, 2018 (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Estimated Fair Value Short-term investments: Corporate bonds $ 17,851 $ — $ (60 ) $ 17,791 Government bonds 7,702 — (22 ) 7,680 Total $ 25,553 $ — $ (82 ) $ 25,471

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Mar. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Gross Fair Value of all Derivative Instruments	The following table summarizes the gross fair value of all derivative instruments, which are not designated as hedging instruments and their location in the consolidated balance sheets (in thousands). Derivative Instrument Location March 31, 2019 September 30, 2018 Foreign Currency Forward Contracts Accrued Expenses and Other Current Liabilities $ 41 $ 270
Company's Derivatives on Consolidated Financial Statements of Operations	The following table summarizes the Company’s realized gains on derivative instruments included in the consolidated statements of operations for the three and six months ended March 31, 2019 and 2018 (in thousands): Three Months Ended Six Months Ended Derivative Instrument Location March 31, 2019 March 31, 2018 March 31, 2019 March 31, 2018 Foreign Currency Forward Contracts Other Income (Expense) $ 217 $ 733 $ 639 $ 575

Trade Accounts and Financing _2

Trade Accounts and Financing Receivables (Tables)	6 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Trade Accounts Receivable, Net	Trade accounts receivable, net are reflected in the following table (in thousands): March 31, 2019 September 30, 2018 Trade accounts receivable $ 21,314 $ 15,776 Allowance for doubtful accounts (680 ) (1,453 ) $ 20,634 $ 14,323
Financing Receivables	Financing receivables are reflected in the following table (in thousands): March 31, 2019 September 30, 2018 Promissory notes $ 4,730 $ 5,646 Sales-type lease 4,032 5,533 Total financing receivables 8,762 11,179 Unearned income: Promissory notes (95 ) (95 ) Sales-type lease (150 ) (237 ) Total unearned income (245 ) (332 ) Total financing receivables, net of unearned income 8,517 10,847 Allowance for doubtful promissory notes (2,104 ) (1,849 ) Less current portion (3,660 ) (4,258 ) Non-current financing receivables $ 2,753 $ 4,740

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventories	Inventories consist of the following (in thousands): March 31, 2019 September 30, 2018 Finished goods $ 18,750 $ 18,802 Work in process 3,745 7,926 Raw material 58,570 54,290 Obsolescence reserve (31,503 ) (30,551 ) 49,562 50,467 Less current portion (15,525 ) (18,812 ) Non-current portion $ 34,037 $ 31,655

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Goodwill and Other Intangible Assets	As a result of this acquisition and the acquisition of Quantum Technology Sciences (“Quantum”) in July 2018, the Company’s consolidated intangible assets consisted of the following (in thousands): Weighted- Average Remaining Useful Lives (in years) March 31, 2019 September 30, 2018 Goodwill $ 5,059 $ 4,343 Other intangible assets: Developed technology 17.4 5,919 4,200 Customer relationships 3.4 3,900 2,500 Trade names 4.5 1,930 1,400 Non-compete agreements 3.5 170 100 Total other intangible assets 10.5 11,919 8,200 Accumulated amortization (989 ) (194 ) $ 10,930 $ 8,006
Future Estimated Amortization Expense of Other intangible Assets	As of March 31, 2019, future estimated amortization expense of other intangible assets is as follows (in thousands): For fiscal years ending September 30, 2019 $ 866 2020 1,732 2021 1,732 2022 1,624 2023 714 Thereafter 4,262 $ 10,930

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Mar. 31, 2019
Stockholders Equity Note [Abstract]
Accumulated Other Comprehensive Loss	Accumulated other comprehensive loss consisted of the following (in thousands): Unrealized Gain (Loss) on Available-for-Sale Securities Foreign Currency Translation Adjustments Totals Balance at October 1, 2018 $ (82 ) $ (15,537 ) $ (15,619 ) Changes in unrealized gain on available-for-sale securities, net of tax 83 — 83 Foreign currency translation adjustments — 20 20 Balance at March 31, 2019 $ 1 $ (15,517 ) $ (15,516 )

Income (Loss) Per Common Share

Income (Loss) Per Common Share (Tables)	6 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Calculation of Net Income (Loss) and Weighted Average Common Shares and Common Equivalent Shares Outstanding for Computation of Loss Per Share	The following table summarizes the calculation of net income (loss) and weighted average common shares and common equivalent shares outstanding for purposes of the computation of loss per share (in thousands, except share and per share data): Three Months Ended Six Months Ended March 31, 2019 March 31, 2018 March 31, 2019 March 31, 2018 Net income (loss) $ 707 $ (4,729 ) $ (5,146 ) $ (14,209 ) Less: Income (loss) allocable to unvested restricted stock (12 ) — — — Income (loss) attributable to common shareholders for diluted earnings per share $ 695 $ (4,729 ) $ (5,146 ) $ (14,209 ) Weighted average number of common share equivalents: Common shares used in basic income (loss) per share 13,401,135 13,264,710 13,369,932 13,233,205 Common share equivalents outstanding related to stock options and RSUs 156,050 — — — Total weighted average common shares and common share equivalents used in diluted income (loss) per share 13,557,185 13,264,710 13,369,932 13,233,205 Income (loss) per share: Basic $ 0.05 $ (0.36 ) $ (0.38 ) $ (1.07 ) Diluted $ 0.05 $ (0.36 ) $ (0.38 ) $ (1.07 )

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Summary of Company's Segment Information	The following table summarizes the Company’s segment information (in thousands): Three Months Ended Six Months Ended March 31, 2019 March 31, 2018 March 31, 2019 March 31, 2018 Revenue: Oil and Gas Markets $ 18,669 $ 11,287 $ 29,673 $ 19,326 Adjacent Markets 7,259 7,826 13,894 14,280 Emerging Markets 46 — 134 — Corporate 149 134 297 285 Total $ 26,123 $ 19,247 $ 43,998 $ 33,891 Income (loss) from operations: Oil and Gas Markets $ 3,332 $ (3,757 ) $ 731 $ (11,430 ) Adjacent Markets 1,651 1,384 2,633 2,413 Emerging Markets (1,180 ) — (2,372 ) — Corporate (2,781 ) (2,849 ) (6,033 ) (5,810 ) Total $ 1,022 $ (5,222 ) $ (5,041 ) $ (14,827 )

Significant Accounting Polici_3

Significant Accounting Policies - Additional Information (Details)	Mar. 31, 2019USD ($)
Accounting Policies [Abstract]
Cash and cash equivalents held by foreign subsidiaries and branch offices	$ 7,500,000
Restricted cash	$ 0

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Cost of revenue reognized from deferred contract cost	$ 0	$ 8,000
Deferred Revenue
Disaggregation Of Revenue [Line Items]
Deferred contract liabilities	100,000	100,000	$ 200,000
Prepaid Expenses and Other Current Assets
Disaggregation Of Revenue [Line Items]
Deferred contract costs	$ 35,000	$ 35,000	$ 27,000

Summary of Revenue from the Sal

Summary of Revenue from the Sale of Products and Services Under Contracts with Customers Excludes All Revenue Earned from Rental Contracts by Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total revenue	$ 11,845	$ 13,910	$ 22,304	$ 27,184
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	11,845	13,910	22,304	27,184
Operating Segments | Oil and Gas Markets
Disaggregation Of Revenue [Line Items]
Total revenue	4,565	6,108	8,323	12,948
Operating Segments | Oil and Gas Markets | Traditional Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	3,261	2,490	5,987	6,089
Operating Segments | Oil and Gas Markets | Wireless Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	310	1,558	454	4,181
Operating Segments | Oil and Gas Markets | Reservoir Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	994	2,060	1,882	2,678
Operating Segments | Adjacent Markets
Disaggregation Of Revenue [Line Items]
Total revenue	7,234	7,802	13,847	14,236
Operating Segments | Adjacent Markets | Industrial Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	4,120	4,711	7,682	8,387
Operating Segments | Adjacent Markets | Imaging Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	3,114	$ 3,091	6,165	$ 5,849
Operating Segments | Emerging Markets
Disaggregation Of Revenue [Line Items]
Total revenue	$ 46		$ 134

Summary of Revenue from the S_2

Summary of Revenue from the Sale of Products and Services Under Contracts with Customers Excludes All Revenue Earned from Rental Contracts by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total revenue	$ 11,845	$ 13,910	$ 22,304	$ 27,184
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	11,845	13,910	22,304	27,184
Operating Segments | Asia
Disaggregation Of Revenue [Line Items]
Total revenue	1,510	1,253	3,068	2,259
Operating Segments | Canada
Disaggregation Of Revenue [Line Items]
Total revenue	342	345	630	710
Operating Segments | Europe
Disaggregation Of Revenue [Line Items]
Total revenue	1,170	917	2,085	4,336
Operating Segments | United States
Disaggregation Of Revenue [Line Items]
Total revenue	8,265	11,338	14,875	19,361
Operating Segments | Other
Disaggregation Of Revenue [Line Items]
Total revenue	$ 558	$ 57	$ 1,646	$ 518

Business Acquisition - Addition

Business Acquisition - Additional Information (Details) - USD ($)	Nov. 13, 2018	Mar. 31, 2019	Mar. 31, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Acquisition purchase price			$ 1,819,000
Contingent earn-out liability		$ 12,055,000	$ 12,055,000	$ 7,713,000
Optoseis Technology
Business Acquisition [Line Items]
Business acquisition date	Nov. 13, 2018
Acquisition purchase price	$ 1,800,000
Contingent payments maximum earn-out amount	$ 23,200,000
Contingent payments earn-out period	5 years 6 months
Goodwill	$ 700,000
Other intangible assets	3,700,000
Fixed assets	1,700,000
Contingent earn-out liability	4,300,000
Legal costs	$ 200,000
Goodwill, period increase (decrease)		900,000
Increase decrease in other intangible assets		800,000
Optoseis Technology | Machinery and Equipment
Business Acquisition [Line Items]
Property plant and equipment, Additions		$ 1,700,000

Short-term Investments (Details

Short-term Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost		$ 25,553
Short-term Investments, Unrealized Losses		(82)
Short-term Investments, Estimated Fair Value		25,471
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost		17,851
Short-term Investments, Unrealized Losses		(60)
Short-term Investments, Estimated Fair Value		17,791
Government bonds
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	$ 747	7,702
Short-term Investments, Unrealized Gains	1
Short-term Investments, Unrealized Losses		(22)
Short-term Investments, Estimated Fair Value	$ 748	$ 7,680

Short-term Investments - Additi

Short-term Investments - Additional Information (Details)	6 Months Ended
	Mar. 31, 2019
Short Term Investments [Abstract]
Short-term investments, contractual maturity period	2020-02

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Details) - CAD ($) $ in Millions	Mar. 29, 2019	Mar. 31, 2019	Sep. 30, 2018
Canadian Dollar Forward Contract
Derivative [Line Items]
Foreign currency forward contract to hedge	$ 10
Foreign currency forward contract term	90 days
Canadian Subsidiary
Derivative [Line Items]
Denominated intercompany accounts payable		$ 14.3	$ 20.4

Gross Fair Value of all Derivat

Gross Fair Value of all Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Foreign Currency Forward Contracts | Accrued Expenses and Other Current Liabilities
Derivatives Fair Value [Line Items]
Derivatives Liabilities	$ 41	$ 270

Company's Derivatives on Consol

Company's Derivatives on Consolidated Financial Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Foreign Currency Forward Contracts | Other Income (Expense)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amount of (Loss) Gain Recognized in Income	$ 217	$ 733	$ 639	$ 575

Trade Accounts Receivable, Net

Trade Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Current trade accounts receivable
Trade accounts receivable	$ 21,314	$ 15,776
Allowance for doubtful accounts	(680)	(1,453)
Total current trade accounts receivable	$ 20,634	$ 14,323

Trade Accounts and Financing _3

Trade Accounts and Financing Receivables - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended
	Apr. 30, 2019	Mar. 31, 2019	Sep. 30, 2018
Accounts Notes And Loans Receivable [Line Items]
Trade accounts receivable		$ 21,314	$ 15,776
Single Customer
Accounts Notes And Loans Receivable [Line Items]
Trade accounts receivable		$ 8,200
Single Customer | Subsequent Event
Accounts Notes And Loans Receivable [Line Items]
Proceeds from trade accounts receivable	$ 6,200

Financing Receivables (Details)

Financing Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	$ 8,762	$ 11,179
Total unearned income	(245)	(332)
Total financing receivables, net of unearned income	8,517	10,847
Allowance for doubtful promissory notes	(2,104)	(1,849)
Less current portion	(3,660)	(4,258)
Non-current financing receivables	2,753	4,740
Promissory Notes
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	4,730	5,646
Total unearned income	(95)	(95)
Sales Type Lease
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	4,032	5,533
Total unearned income	$ (150)	$ (237)

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Inventory Disclosure [Abstract]
Finished goods	$ 18,750	$ 18,802
Work in process	3,745	7,926
Raw material	58,570	54,290
Obsolescence reserve	(31,503)	(30,551)
Total	49,562	50,467
Less current portion	(15,525)	(18,812)
Non-current portion	$ 34,037	$ 31,655

Inventories - Additional Inform

Inventories - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Inventory Disclosure [Abstract]
Inventories transferred to rental equipment	$ 1.8	$ 8.1
Raw materials include semi-finished goods and component parts	$ 28.5		$ 29

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Nov. 30, 2018	Sep. 30, 2018
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 5,059,000			$ 4,343,000
Amortization expense	795,000	$ 0
Optoseis Technology
Goodwill And Other Intangible Assets [Line Items]
Goodwill	5,059,000		$ 700,000	4,343,000
Other intangible assets	$ 11,919,000		$ 3,700,000	$ 8,200,000

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Nov. 30, 2018	Sep. 30, 2018
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 5,059		$ 4,343
Other intangible assets, net	10,930		8,006
Optoseis Technology
Goodwill And Other Intangible Assets [Line Items]
Goodwill	5,059	$ 700	4,343
Total other intangible assets	11,919	$ 3,700	8,200
Accumulated amortization	(989)		(194)
Other intangible assets, net	$ 10,930		8,006
Weighted-Average Remaining Useful Lives (in years)	10 years 6 months
Optoseis Technology | Developed Technology
Goodwill And Other Intangible Assets [Line Items]
Total other intangible assets	$ 5,919		4,200
Weighted-Average Remaining Useful Lives (in years)	17 years 4 months 24 days
Optoseis Technology | Customer Relationships
Goodwill And Other Intangible Assets [Line Items]
Total other intangible assets	$ 3,900		2,500
Weighted-Average Remaining Useful Lives (in years)	3 years 4 months 24 days
Optoseis Technology | Trade Names
Goodwill And Other Intangible Assets [Line Items]
Total other intangible assets	$ 1,930		1,400
Weighted-Average Remaining Useful Lives (in years)	4 years 6 months
Optoseis Technology | Non-compete Agreements
Goodwill And Other Intangible Assets [Line Items]
Total other intangible assets	$ 170		$ 100
Weighted-Average Remaining Useful Lives (in years)	3 years 6 months

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Future Estimated Amortization Expense Of Other intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
2019	$ 866
2020	1,732
2021	1,732
2022	1,624
2023	714
Thereafter	4,262
Other intangible assets, net	$ 10,930	$ 8,006

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Beginning Balance	$ 171,397	$ 185,893	$ 176,587	$ 194,803
Changes in unrealized gain on available-for-sale securities, net of tax	19	(38)	83	(89)
Foreign currency translation adjustments	238	1,039	20	834
Ending Balance	172,953	182,711	172,953	182,711
Unrealized Gain (Loss) on Available-for-Sale Securities
Beginning Balance			(82)
Changes in unrealized gain on available-for-sale securities, net of tax			83
Ending Balance	1		1
Foreign Currency Translation Adjustments
Beginning Balance			(15,537)
Foreign currency translation adjustments			20
Ending Balance	(15,517)		(15,517)
Accumulated Other Comprehensive Loss
Beginning Balance	(15,773)	(14,486)	(15,619)	(14,230)
Ending Balance	$ (15,516)	$ (13,485)	$ (15,516)	$ (13,485)

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details)	6 Months Ended
	Mar. 31, 2019USD ($)$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense | $	$ 35,000
Expected period for recognition of unrecognized compensation expense	7 months 6 days
Nonqualified stock options unvested and outstanding | shares	165,600
Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share unvested and outstanding | shares	226,787
Restricted Stock Awards | 2014 Long Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued | shares	8,000
Weighted average grant date fair value of the restricted stock | $ / shares	$ 14.59
Grant date fair value of restricted stock issued | $	$ 100,000
Restricted stock restriction period	4 years
Unrecognized compensation expense | $	$ 3,100,000
Expected period for recognition of unrecognized compensation expense	2 years 3 months 18 days
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share unvested and outstanding | shares	161,300
Restricted Stock Units (RSUs) | 2014 Long Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued | shares	161,800
Weighted average grant date fair value of the restricted stock | $ / shares	$ 15.11
Restricted stock restriction period	4 years
Unrecognized compensation expense | $	$ 2,200,000
Expected period for recognition of unrecognized compensation expense	3 years 8 months 12 days
Grant date fair value of restricted stock | $	$ 2,400,000
Restricted stock units vesting rights	Each RSU represents a contingent right to receive one share of the Company’s common stock upon vesting.

Income (Loss) Per Common Shar_2

Income (Loss) Per Common Share - Additional Information (Details)	3 Months Ended	6 Months Ended
	Mar. 31, 2018shares	Mar. 31, 2019shares	Mar. 31, 2018shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Split of common stock ratio		2
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Number of stock excluded from calcuation of weighted average shares outstandiing	194,600	163,800	194,600
Non-Vested RSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Number of stock excluded from calcuation of weighted average shares outstandiing	0	161,300	0

Calculation of Net income (Loss

Calculation of Net income (Loss) and Weighted Average Common Shares and Common Equivalent Shares Outstanding for Computation of Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 707	$ (5,853)	$ (4,729)	$ (9,480)	$ (5,146)	$ (14,209)
Less: Income (loss) allocable to unvested restricted stock	(12)
Income (loss) attributable to common shareholders for diluted earnings per share	$ 695		$ (4,729)		$ (5,146)	$ (14,209)
Weighted average common shares outstanding:
Common shares used in basic income (loss) per share	13,401,135		13,264,710		13,369,932	13,233,205
Common share equivalents outstanding related to stock options and RSUs	156,050
Total weighted average common shares and common share equivalents used in diluted income (loss) per share	13,557,185		13,264,710		13,369,932	13,233,205
Income (loss) per share:
Basic	$ 0.05		$ (0.36)		$ (0.38)	$ (1.07)
Diluted	$ 0.05		$ (0.36)		$ (0.38)	$ (1.07)

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($)	Nov. 13, 2018	Jul. 27, 2018	Mar. 31, 2019	Sep. 30, 2018
Commitments And Contingencies [Line Items]
Contingent earn-out liability			$ 12,055,000	$ 7,713,000
Quantum
Commitments And Contingencies [Line Items]
Contingent earn-out liability		$ 7,700,000
Contingent payments earn-out period		4 years
Contingent payments maximum earn-out amount		$ 23,500,000
Optoseis Technology
Commitments And Contingencies [Line Items]
Contingent earn-out liability	$ 4,300,000
Contingent payments earn-out period	5 years 6 months
Contingent payments maximum earn-out amount	$ 23,200,000

Segment Information - Additiona

Segment Information - Additional Information (Details)	6 Months Ended
	Mar. 31, 2019Segment
Segment Reporting [Abstract]
Number of operating segments	3

Summary of Company's Segment In

Summary of Company's Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 26,123	$ 19,247	$ 43,998	$ 33,891
Income (loss) from operations	1,022	(5,222)	(5,041)	(14,827)
Operating Segments | Oil and Gas Markets
Segment Reporting Information [Line Items]
Revenue	18,669	11,287	29,673	19,326
Income (loss) from operations	3,332	(3,757)	731	(11,430)
Operating Segments | Adjacent Markets
Segment Reporting Information [Line Items]
Revenue	7,259	7,826	13,894	14,280
Income (loss) from operations	1,651	1,384	2,633	2,413
Operating Segments | Emerging Markets
Segment Reporting Information [Line Items]
Revenue	46		134
Income (loss) from operations	(1,180)		(2,372)
Corporate
Segment Reporting Information [Line Items]
Revenue	149	134	297	285
Income (loss) from operations	$ (2,781)	$ (2,849)	$ (6,033)	$ (5,810)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
United States statutory tax rate	21.00%				35.00%
Decrease in deferred tax asset due to Tax Act				$ 8,100
Income tax expense (benefit)	$ 550	$ (676)	$ 557	$ (670)
Proceeds from income tax refunds		$ 700
Nigeria
Income Taxes [Line Items]
Foreign withholding taxes	$ 600