Westell (WSTL) 10-Q 2 Nov 17 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Sep. 30, 2017	Oct. 23, 2017
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Entity Registrant Name	WESTELL TECHNOLOGIES INC
Entity Central Index Key	1,002,135
Current Fiscal Year End Date	--03-31
Entity Filer Category	Smaller Reporting Company
Class A Common Stock
Entity Common Stock, Shares Outstanding		12,068,162
Class B Common Stock
Entity Common Stock, Shares Outstanding		3,484,287

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Sep. 30, 2017		Mar. 31, 2017
Current assets:
Cash and cash equivalents	$ 19,200,000	[1]	$ 21,778,000
Short-term Investments	5,011,000		0
Accounts receivable (net of allowance of $90 at September 30, 2017, and March 31, 2017)	11,038,000		12,075,000
Inventories	9,983,000		12,511,000
Prepaid expenses and other current assets	1,034,000		1,409,000
Total current assets	46,266,000		47,773,000
Land, property and equipment, gross	9,065,000		16,062,000
Less accumulated depreciation and amortization	(7,267,000)		(14,078,000)
Land, property and equipment, net	1,798,000		1,984,000
Intangible assets, net	13,529,000		15,624,000
Other non-current assets	87,000		160,000
Total assets	61,680,000		65,541,000
Current liabilities:
Accounts payable	3,210,000		4,163,000
Accrued expenses	3,823,000		4,273,000
Restructuring Reserve, Current	415,000		1,171,000
Deferred revenue	1,055,000		2,359,000
Total current liabilities	8,503,000		11,966,000
Deferred revenue non-current	929,000		1,102,000
Restructuring Reserve, Noncurrent	0		63,000
Other non-current liabilities	317,000		236,000
Total liabilities	9,749,000		13,367,000
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, par $0.01, Authorized - 1,000,000 shares. Issued and outstanding - none	0		0
Additional paid-in capital	417,093,000		416,422,000	[2]
Treasury stock at cost – 4,593,368 and 4,440,600(1) shares at September 30, 2017, and March 31, 2017, respectively	(35,790,000)		(35,335,000)
Cumulative translation adjustment	0		608,000
Accumulated deficit	(329,528,000)		(329,676,000)
Total stockholders’ equity	51,931,000		52,174,000
Total liabilities and stockholders’ equity	61,680,000		65,541,000
Class A Common Stock
Stockholders’ equity:
Common stock, value	121,000		120,000	[2]
Class B Common Stock
Stockholders’ equity:
Common stock, value	$ 35,000		$ 35,000	[2]
[1]	As of September 30, 2017, the Company has $5.0 million of short-term investments in addition to cash and cash equivalents.
[2]	All common stock (except authorized shares), equity share, and per share amounts have been retroactively adjusted to reflect a one-for-four reverse stock split, which was effective June 7, 2017.

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Accounts receivable, allowance	$ 90	$ 90
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Treasury stock, shares	4,593,368	4,440,600	[1]
Class A Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	109,000,000	109,000,000
Common stock, shares outstanding	12,080,445	12,015,043	[1]
Class B Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	3,484,287	3,484,287	[1]
Common stock, shares outstanding	3,484,287	3,484,287	[1]
[1]	All common stock (except authorized shares), equity share, and per share amounts have been retroactively adjusted to reflect a one-for-four reverse stock split, which was effective June 7, 2017.

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Sales Revenue, Goods, Net		$ 16,097		$ 15,881		$ 31,642		$ 29,494
Sales Revenue, Services, Net		1,135		1,899		2,164		3,102
Total revenue		17,232		17,780		33,806		32,596
Cost of Goods Sold		9,522		10,380	[1]	18,946		19,981	[1]
Cost of Services		435		1,033		818		1,683
Total cost of revenue		9,957		11,413	[1]	19,764		21,664	[1]
Gross profit		7,275		6,367	[1]	14,042		10,932	[1]
Operating expenses
Research and development		2,205		3,327		4,481		7,604
Sales and marketing		1,992		2,896		4,328		6,277
General and administrative		1,809		2,218		3,520		4,563
Intangible amortization		1,048		1,201		2,095		2,401
Restructuring		165		2,601		165		2,565
Impairment of Long-Lived Assets to be Disposed of		0		0		0		1,181
Total operating expenses		7,219		12,243		14,589		24,591
Operating profit (loss)		56		(5,876)		(547)		(13,659)
Other income, net		677	[2]	74		720	[2]	91
Income (loss) before income taxes		733		(5,802)		173		(13,568)
Income tax expense		(13)		(8)		(25)		(10)
Net income (loss)		$ 720		$ (5,810)		$ 148		$ (13,578)
Net income (loss) per share:
Basic		$ 0.05		$ (0.38)	[3]	$ 0.01		$ (0.89)	[3]
Diluted		$ 0.05		$ (0.38)	[3]	$ 0.01		$ (0.89)	[3]
Weighted-average number of common shares outstanding:
Basic (shares)		15,461		15,299	[3]	15,471		15,277	[3]
Effect of dilutive securities: restricted stock, restricted stock units, performance stock units and stock options (4)	[4]	211		0		167		0
Diluted (shares)		15,672		15,299	[3]	15,638		15,277	[3]
[1]	The three and six months ended September 30, 2016, includes $0.2 million and $1.6 million of E&O expense for ClearLink DAS inventory and pipeline inventory.
[2]	During the quarter ended September 30, 2017, the Company dissolved the NoranTel legal entity, which triggered a one-time foreign currency gain with the reversal of a cumulative translation adjustment. See Note 1.
[3]	All common stock (except authorized shares), equity share, and per share amounts have been retroactively adjusted to reflect a one-for-four reverse stock split, which was effective June 7, 2017.
[4]	The Company had 0.4 million and 0.5 million shares represented by common stock equivalents for the three and six months ended September 30, 2017, and 1.3 million and 1.4 million shares represented by common stock equivalents for the three and six months ended September 30, 2016, which were not included in the computation of average dilutive shares outstanding because they were anti-dilutive. In periods with a net loss from continuing operations, the basic loss per share equals the diluted loss per share as all common stock equivalents are excluded from the per share calculation.

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Operations (Unaudited) Condensed Consolidated Statements of Operations Parenthetical (Unaudited) - USD ($) shares in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Production Related Impairments or Charges		$ 200	$ 0	$ 1,600,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.4	1.3	0.5	1.4

Condensed Statements of Compreh

Condensed Statements of Comprehensive Income ( Loss) (Unaudited) Statement - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income (loss)		$ 720	$ (5,810)	$ 148	$ (13,578)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	[1]	(608)		(608)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		$ 112	$ (5,810)	$ (460)	$ (13,578)
[1]	During the quarter ended September 30, 2017, the Company dissolved the NoranTel legal entity, which triggered a one-time foreign currency gain with the reversal of a cumulative translation adjustment. See Note 1.

Condensed Statements of Stockho

Condensed Statements of Stockholders' Equity (Unaudited) Statement - 6 months ended Sep. 30, 2017 - USD ($) $ in Thousands		Total	Common Stock [Member]Common Class A [Member]		Common Stock [Member]Common Class B [Member]		Additional Paid-in Capital [Member]		Treasury Stock [Member]	Accumulated Foreign Currency Adjustment Attributable to Parent [Member]	Retained Earnings [Member]
Stockholders' Equity Attributable to Parent at Mar. 31, 2017		$ 52,174	$ 120	[1]	$ 35	[1]	$ 416,422	[1]	$ (35,335)	$ 608	$ (329,676)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		148									148
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	[2]	(608)								(608)
Stock Issued During Period, Value, Share-based Compensation, Gross		1	2				(1)
Treasury Stock, Value, Acquired, Cost Method		(456)	(1)						(455)
Stock-based compensation		672					672
Stockholders' Equity Attributable to Parent at Sep. 30, 2017		$ 51,931	$ 121		$ 35		$ 417,093		$ (35,790)	$ 0	$ (329,528)
[1]	All common stock (except authorized shares), equity share, and per share amounts have been retroactively adjusted to reflect a one-for-four reverse stock split, which was effective June 7, 2017.
[2]	During the quarter ended September 30, 2017, the Company dissolved the NoranTel legal entity, which triggered a one-time foreign currency gain with the reversal of a cumulative translation adjustment. See Note 1.

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2017		Sep. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ 148		$ (13,578)
Reconciliation of net loss to net cash used in operating activities:
Depreciation and amortization	2,526		3,230
Impairment of Long-Lived Assets to be Disposed of	0		1,181
Stock-based compensation	672		1,093
Loss on sale of fixed assets	8		11
Restructuring	165		2,565
Deferred taxes	0		14
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	(608)
Exchange rate loss (gain)	(6)		0
Changes in assets and liabilities:
Accounts receivable	1,025		2,722
Inventories	2,528		820
Prepaid expenses and other current assets	375		(23)
Other assets	73		15
Deferred revenue	(1,477)		(131)
Accounts payable and accrued expenses	(2,082)		(4,800)
Accrued compensation	(224)		(1,109)
Net cash provided by (used in) operating activities	3,123		(7,990)
Cash flows from investing activities:
Maturities of held-to-maturity short-term debt securities	0		12,621
Purchases of held-to-maturity short-term debt securities	0		(2,066)
Purchases of other short-term investments	(5,011)		0
Purchases of property and equipment	(254)		(498)
Net cash provided by (used in) investing activities	(5,265)		10,057
Cash flows from financing activities:
Purchases of treasury stock	(456)		(141)
Payment of contingent consideration	0		(175)
Net cash provided by (used in) financing activities	(456)		(316)
Gain (loss) of exchange rate changes on cash	20		(3)
Net increase (decrease) in cash and cash equivalents	(2,578)		1,748
Cash and cash equivalents, beginning of period	21,778		19,169
Cash and cash equivalents, end of period (1)	$ 19,200	[1]	$ 20,917
[1]	As of September 30, 2017, the Company has $5.0 million of short-term investments in addition to cash and cash equivalents.

Basis of Presentation (Notes)

Basis of Presentation (Notes)	6 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Reverse Stock Split All common stock, equity, share and per share amounts in the financial statements and notes have been retroactively adjusted to reflect a one-for-four reverse stock split, which was effective June 7, 2017. Description of Business Westell Technologies, Inc. (the Company) is a holding company. Its wholly owned subsidiary, Westell, Inc., designs and distributes telecommunications products, which are sold primarily to major telephone companies. During the second quarter ended September 30, 2017, the Company dissolved Noran Tel, Inc. (NoranTel) a wholly owned subsidiary of Westell, Inc. NoranTel's operations have been fully incorporated into Westell, Inc. As a result of the wind-up of NoranTel, the Company recognized a one-time $0.6 million foreign currency translation gain, which is presented in Other income, net on the Condensed Consolidated Statements of Operations. Basis of Presentation and Reporting The accompanying Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. The Condensed Consolidated Financial Statements have been prepared using generally accepted accounting principles (GAAP) in the United States for interim financial reporting, and consistent with the instructions of Form 10-Q and Article 10 of Regulation S-X and, accordingly, they do not include all of the information and footnotes required in the annual consolidated financial statements and accompanying footnotes. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended March 31, 2017 . All intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, the unaudited interim financial statements included herein reflect all adjustments, consisting of normal recurring adjustments, necessary to present fairly the Company’s condensed consolidated financial position and the results of operations, comprehensive income (loss) and cash flows at September 30, 2017 , and for all periods presented. The results of operations for the periods presented are not necessarily indicative of the results that may be expected for fiscal year 2018 . 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 that affect revenue and expenses during the periods reported. Estimates are used when accounting for the allowance for uncollectible accounts receivable, net realizable value of inventory, product warranty accrued, relative selling prices, stock-based compensation, intangible assets fair value, depreciation, income taxes, and contingencies, among other things. Actual results could differ from those estimates. Recently Adopted Accounting Pronouncements In July 2015, the FASB issued ASU 2015-11, Simplifying the Measurement of Inventory (ASU 2015-11). The core principle of the guidance is that an entity should measure inventory at the "lower of cost and net realizable value" and options that currently exist for "market value" will be eliminated. The ASU defines net realizable value as the "estimated selling prices in the ordinary course of business, less reasonably predictable cost of completion, disposal, and transportation." The Company adopted ASU 2015-11 on April 1, 2017. The adoption of this ASU did not have a material impact to the Company's Consolidated Financial Statements or related disclosures. In the fourth quarter of fiscal year 2017, the Company adopted ASU 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (ASU 2014-15). ASU 2014-15 provides guidance on management’s responsibility in evaluating whether there is substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. For each annual and interim reporting period, management is required to evaluate whether there are conditions or events that raise substantial doubt about a company’s ability to continue as a going concern within one year from the date the financial statements are issued. The adoption of ASU 2014-15 had no significant effect on its Consolidated Financial Statements or related disclosures as of September 30, 2017 . Recently Issued Accounting Pronouncements Not Yet Adopted In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting (ASU 2017-09). ASU 2017-09 clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The standard is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. The Company is currently evaluating the potential impact ASU 2017-09 will have on the Company's Consolidated Financial Statements. In October 2016, the FASB issued ASU 2016-16, Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory (ASU 2016-16). ASU 2016-16 requires the recognition of current and deferred income taxes for intra-entity asset transfers when the transaction occurs. ASU 2016-16 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted. ASU 2016-16 is effective for the Company in the first quarter of fiscal 2019, and the Company is currently in the process of evaluating the potential impact of adoption of this updated authoritative guidance on the Company's Consolidated Financial Statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flow (Topic 230) (ASU 2016-15). This update is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The update provides new guidance regarding the classification of debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, distributions received from equity method investments, beneficial interests in securitized transactions, and separately identifiable cash flows and application of the predominance principle. This standard will be effective for financial statements issued by public companies for the annual and interim periods beginning after December 15, 2017. Early adoption of the standard is permitted. The standard will be applied in a retrospective approach for each period presented. The Company is currently evaluating the potential impact ASU 2016-15 will have on the Company's Consolidated Financial Statements and related disclosures. In February 2016, the FASB issued ASU 2016-02, Leases (ASU 2016-02). In September 2017, the FASB issued ASU 2017-13, Revenue Recognition (Topic 605), Revenue from Contracts with Customers (Topic 606), Leases (Topic 840), and Leases (Topic 842) (ASU 2017-13), which provides additional implementation guidance on the previously issued ASU 2016-02. ASU 2016-02 requires lessees to recognize leases on the balance sheet as a lease liability with a corresponding right-of-use asset for leases with a lease term of more than one year. ASU 2016-02 is effective for financial statements issued for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new standard requires a modified retrospective transition for capital or operating leases existing at or entered into after the beginning of the earliest comparative period presented in the financial statements, but it does not require transition accounting for leases that expire prior to the date of initial application. The Company is currently evaluating the impact that ASU 2016-02 will have on the Company's Consolidated Financial Statements and related disclosures. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (ASU 2014-09), that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 is based on the principle that an entity should recognize revenue to depict the transfer of 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. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract. Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard. ASU 2014-09 is initially scheduled to become effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period; early adoption is not permitted. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606) — Deferral of the Effective Date (ASU 2015-14) , which defers the effective date of ASU 2014-09 for one year and permits early adoption as early as the original effective date of ASU 2014-09. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. In 2016, the FASB issued additional guidance to clarify the implementation guidance (ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ; ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ; ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients: and ASU 2016-20 (Topic 606) Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers . In September 2017, the FASB issued ASU 2017-13. These amendments provide additional clarification and implementation guidance on the previously issued ASU 2014-09. The Company commenced the assessment of ASU 2014-09 during the first quarter of fiscal year 2018 and developed a project plan to guide the implementation. This project plan includes analyzing the standard’s impact on the Company’s contract portfolio, comparing historical accounting policies and practices to the requirements of the new standard and identifying potential differences from applying the requirements of the new standard to its contracts. The Company will draft an updated accounting policy, evaluate new disclosure requirements and identify and implement appropriate changes to business processes, systems and controls to support recognition and disclosure under the new standard. The Company expects to adopt this new standard using the modified retrospective method that will result in a cumulative effect adjustment as of the date of adoption. The Company is currently evaluating this guidance and the impact it will have on the Company's Consolidated Financial Statements and related disclosures.

Restructuring Charge (Notes)

Restructuring Charge (Notes)	6 Months Ended
	Sep. 30, 2017
Restructuring Charges [Abstract]
Restructuring Charge	Restructuring Charges In the three and six months ended September 30, 2017, the Company recorded a restructuring expense of $0.2 million related to employee termination costs that spanned all three segments (the 2018 restructuring). In the second quarter of fiscal year 2017, the Company approved a restructuring plan (the 2017 restructuring) , including discontinuing development of the ClearLink Distributed Antenna System (DAS), a general reduction of headcount that spanned all three segments, and consolidation of facilities in Manchester, NH and Aurora, IL. The Company recognized a restructuring expense of $2.6 million in the six months ended September 30, 2016. The 2017 restructuring costs totaled $3.2 million in the twelve months ended March 31, 2017 , inclusive of non-cash charges of approximately $1.2 million related to losses on leased facilities, $1.3 million of employee termination costs, and $0.7 million of other associated costs. In the six months ended September 30, 2016, a $1.2 million impairment charge of fixed assets and $1.6 million of E&O expense for ClearLink DAS inventory and pipeline inventory, associated with the IBW segment was recognized. The planned restructuring was substantially completed by March 31, 2017. As of September 30, 2017 , $0.4 million of the restructuring costs, related to employee termination costs from the 2018 restructuring and the office space from the 2017 restructuring, are unpaid and accrued on the Condensed Consolidated Balance Sheets presented in Accrued restructuring. As of March 31, 2017, $1.2 million and $63,000 of the restructuring costs, primarily related to the office space from the 2015 restructuring and 2017 restructuring, are unpaid and accrued on the Condensed Consolidated Balance Sheets presented in Accrued restructuring and Accrued restructuring non-current, respectively. The restructuring costs are expected to be paid in full by the first quarter of fiscal year 2019 concurrent with the termination date of the contractual lease in Manchester, NH. Total liability for restructuring charges and their utilization for the six months ended September 30, 2017 , are summarized as follows: Six months ended September 30, 2017 (in thousands) Employee-related Other costs Total Liability at beginning of period $ — $ 1,234 $ 1,234 Charged 165 — 165 Paid (19 ) (965 ) (984 ) Liability at end of period $ 146 $ 269 $ 415

Interim Segment Information (No

Interim Segment Information (Notes)	6 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Interim Segment Information	Interim Segment Information Segment information is presented in accordance with a “management approach", which designates the internal reporting used by the chief operating decision-maker (CODM) for making decisions and assessing performance as the source of the Company's reportable segments. Westell’s Chief Executive Officer is the CODM. The CODM continues to define segment profit as gross profit less research and development expenses. The accounting policies of the segments are the same as those for Westell Technologies, Inc. described in the summary of significant accounting policies included in the Company's Annual Report on Form 10-K for year ended March 31, 2017. The Company’s three reportable segments are as follows: In-Building Wireless (IBW) Segment The IBW segment solutions enable cellular coverage in stadiums, arenas, malls, buildings, and other indoor areas not served well or at all by the existing "macro" outdoor cellular network. For commercial service, the IBW segment solutions include distributed antenna systems (DAS) conditioners and digital repeaters. For the public safety market, the IBW segment solutions include half-watt and two-watt repeaters and a battery backup unit. The Company’s IBW segment also offers ancillary products that consist of passive system components and antennas for both the commercial and public safety markets. Intelligent Site Management and Services (ISMS) Segment The ISMS segment solutions include a suite of remote units which provide machine-to-machine (M2M) communications that enable operators to remotely monitor, manage, and control site infrastructure and support systems. Remote units can be and often are combined with the Company’s Optima management software system. The Company also offers support agreement services (i.e., maintenance) and deployment services (i.e., installation). Communications Network Solutions (CNS) Segment The CNS segment solutions include a broad range of outdoor network infrastructure offerings consisting of integrated cabinets, power distribution products, copper and fiber connectivity panels, T1 network interface units (NIUs), and tower mounted amplifiers (TMAs). Segment information for the three and six months ended September 30, 2017 , and 2016 , is set forth below: Three months ended September 30, 2017 (in thousands) IBW ISMS CNS Total Revenue $ 7,919 $ 4,730 $ 4,583 $ 17,232 Cost of revenue 4,269 2,511 3,177 9,957 Gross profit 3,650 2,219 1,406 7,275 Gross margin 46.1 % 46.9 % 30.7 % 42.2 % Research and development 1,443 523 239 2,205 Segment profit $ 2,207 $ 1,696 $ 1,167 5,070 Operating expenses: Sales and marketing 1,992 General and administrative 1,809 Intangible amortization 1,048 Restructuring 165 Long-lived assets impairment — Operating profit (loss) 56 Other income, net 677 Income tax expense (13 ) Net income (loss) $ 720 Three months ended September 30, 2016 (in thousands) IBW ISMS CNS Total Revenue $ 6,644 $ 5,109 $ 6,027 $ 17,780 Cost of revenue 4,411 (1) 2,702 4,300 11,413 (1) Gross profit 2,233 (1) 2,407 1,727 6,367 (1) Gross margin 33.6 % (1) 47.1 % 28.7 % 35.8 % (1) Research and development 1,594 1,237 496 3,327 Segment profit $ 639 $ 1,170 $ 1,231 3,040 Operating expenses: Sales and marketing 2,896 General and administrative 2,218 Intangible amortization 1,201 Restructuring 2,601 Long-lived assets impairment — Operating profit (loss) (5,876 ) Other income, net 74 Income tax expense (8 ) Net income (loss) $ (5,810 ) (1) The three and six months ended September 30, 2016, includes E&O expense for ClearLink DAS inventory and pipeline inventory. See Note 2, Restructuring Charges . Six months ended September 30, 2017 (in thousands) IBW ISMS CNS Total Revenue $ 14,875 $ 8,860 $ 10,071 $ 33,806 Cost of revenue 8,211 4,515 7,038 19,764 Gross profit 6,664 4,345 3,033 14,042 Gross margin 44.8 % 49.0 % 30.1 % 41.5 % Research and development 2,906 1,088 487 4,481 Segment profit $ 3,758 $ 3,257 $ 2,546 9,561 Operating expenses: Sales and marketing 4,328 General and administrative 3,520 Intangible amortization 2,095 Restructuring 165 Long-lived assets impairment — Operating profit (loss) (547 ) Other income, net 720 Income tax expense (25 ) Net income (loss) $ 148 Six months ended September 30, 2016 (in thousands) IBW ISMS CNS Total Revenue $ 12,765 $ 9,248 $ 10,583 $ 32,596 Cost of revenue 9,538 (1) 4,822 7,304 21,664 (1) Gross profit 3,227 (1) 4,426 3,279 10,932 (1) Gross margin 25.3 % (1) 47.9 % 31.0 % 33.5 % (1) Research and development 3,958 2,531 1,115 7,604 Segment profit (loss) $ (731 ) $ 1,895 $ 2,164 3,328 Operating expenses: Sales and marketing 6,277 General and administrative 4,563 Intangible amortization 2,401 Restructuring 2,565 Long-lived assets impairment 1,181 Operating profit (loss) (13,659 ) Other income, net 91 Income tax expense (10 ) Net income (loss) $ (13,578 ) (1) The three and six months ended September 30, 2016, includes E&O expense for ClearLink DAS inventory and pipeline inventory. See Note 2 , Restructuring Charges . Segment asset information is not reported to or used by the CODM.	[1]
[1]	The three and six months ended September 30, 2016, includes $0.2 million and $1.6 million of E&O expense for ClearLink DAS inventory and pipeline inventory.

Inventories (Notes)

Inventories (Notes)	6 Months Ended
	Sep. 30, 2017
Inventory, Net [Abstract]
Inventories	Inventories Inventories are stated at the lower of first-in, first-out cost or market value. The components of inventories are as follows: (in thousands) September 30, 2017 March 31, 2017 Raw materials $ 3,634 $ 3,871 Work-in-process — — Finished goods 6,349 8,640 Total inventories $ 9,983 $ 12,511

Stock-Based Compensation (Notes

Stock-Based Compensation (Notes)	6 Months Ended
	Sep. 30, 2017
Share-based Compensation [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Westell Technologies, Inc. 2015 Omnibus Incentive Compensation Plan (the 2015 Plan) was approved at the annual meeting of stockholders on September 16, 2015. The 2015 Plan replaced the Westell Technologies, Inc. 2004 Stock Incentive Plan (the 2004 Plan). If any award granted under the 2015 Plan or the 2004 Plan is canceled, terminates, expires, or lapses for any reason, any Shares subject to such award shall again be available for the grant of an award under the 2015 Plan. Shares subject to an award shall not again be made available for issuance under the Plan if such Shares are: (a) shares delivered to or withheld by the Company to pay the grant or purchase price of an award, or (b) shares delivered to or withheld by the Company to pay the withholding taxes related to an award. The stock options, restricted stock awards, and restricted stock units (RSUs) awarded under the 2015 Plan vest in equal annual installments over 3 years for employees and 1 year for independent directors. The stock options, restricted stock awards, and RSUs awarded under the 2004 Plan vest in equal annual installments over 4 years . Performance stock units (PSUs) earned vest over the performance period. Certain awards provide for accelerated vesting if there is a change in control (as defined in the 2015 Plan), or when provided within individual employment contracts. The Company accounts for forfeitures as they occur. The Company issues new shares for stock awards under the 2015 Plan. The following table is a summary of total stock-based compensation expense resulting from stock options, restricted stock, RSUs and PSUs, during the three and six months ended September 30, 2017 , and 2016 : Three months ended September 30, Six months ended September 30, (in thousands) 2017 2016 2017 2016 Stock-based compensation expense $ 342 $ 687 $ 672 $ 1,093 Income tax benefit — — — — Total stock-based compensation expense, after taxes $ 342 $ 687 $ 672 $ 1,093 Stock Options Stock option activity for the six months ended September 30, 2017 , is as follows: Shares Weighted-Average Exercise Price Per Share Weighted-Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (1) (in thousands) Outstanding on March 31, 2017 362,396 $ 4.89 5.4 $ 39 Granted 100,000 3.06 Exercised — — Forfeited (97,399 ) 4.38 Expired (30,501 ) 6.83 Outstanding on September 30, 2017 334,496 $ 4.32 5.1 $ 12 (1) The intrinsic value for the stock options is calculated based on the difference between the exercise price of the underlying awards and the Westell Technologies’ closing stock price as of the respective reporting date. Restricted Stock The following table sets forth restricted stock activity for the six months ended September 30, 2017 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2017 34,375 $ 4.11 Granted 104,636 3.01 Vested (66,250 ) 3.30 Forfeited — — Non-vested as of September 30, 2017 72,761 $ 3.26 RSUs The following table sets forth the RSU activity for the six months ended September 30, 2017 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2017 373,886 $ 4.48 Granted 527,000 2.84 Vested (111,954 ) 5.27 Forfeited (189,609 ) 3.79 Non-vested as of September 30, 2017 599,323 $ 3.10 PSUs The following table sets forth the PSU activity for the six months ended September 30, 2017 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2017 (at target) 76,053 $ 3.56 Granted, at target 40,000 2.63 Vested (2,343 ) 10.22 Forfeited (18,864 ) 2.17 Non-vested as of September 30, 2017 (at target) 94,846 $ 3.29

Product Warranties (Notes)

Product Warranties (Notes)	6 Months Ended
	Sep. 30, 2017
Product Warranties Disclosures [Abstract]
Product Warranties	Product Warranties The Company’s products carry a limited warranty ranging from one to five years for the products within the IBW segment, typically one year for products within the ISMS segment, and one to seven years for products within the CNS segment. The specific terms and conditions of those warranties vary depending upon the customer and the products sold. Factors that affect the estimate of the Company’s warranty reserve include: the number of units shipped, anticipated rates of warranty claims, and cost per claim. The Company periodically assesses the adequacy of its recorded warranty liability and adjusts the reserve as necessary. The current portions of the warranty reserve are $164,000 and $163,000 as of September 30, 2017 , and March 31, 2017 , respectively, and are presented on the Condensed Consolidated Balance Sheets in Accrued expenses. The non-current portions of the warranty reserves are $282,000 and $232,000 as of September 30, 2017 , and March 31, 2017 , respectively, and are presented on the Condensed Consolidated Balance Sheets in Other non-current liabilities. The following table presents the changes in the Company’s product warranty reserve: Three months ended September 30, Six months ended September 30, (in thousands) 2017 2016 2017 2016 Total product warranty reserve at the beginning of the period $ 385 $ 439 $ 395 $ 436 Warranty expense to cost of revenue 105 33 118 67 Utilization (44 ) (12 ) (67 ) (43 ) Total product warranty reserve at the end of the period $ 446 $ 460 $ 446 $ 460

Variable Interest Entity and Gu

Variable Interest Entity and Guarantee (Notes)	6 Months Ended
	Sep. 30, 2017
Guarantees [Abstract]
Equity Method Investment [Text Block]	Variable Interest Entity and Guarantee The Company has a 50% equity ownership in AccessTel Kentrox Australia PTY LTD (AKA). AKA distributes network management solutions provided by the Company and the other 50% owner to one customer. The Company holds equal voting control with the other owner. All actions of AKA are decided at the board level by majority vote. The Company evaluated ASC 810, Consolidations , and concluded that AKA is a variable interest entity (VIE) and the Company has a variable interest in the VIE. The Company has concluded that it is not the primary beneficiary of AKA and, therefore, consolidation is not required. As of September 30, 2017 , and March 31, 2017 , the carrying amount of the Company's investment in AKA was approximately $56,000 and $111,000 , respectively, which is presented on the Condensed Consolidated Balance Sheets within Other non-current assets. The Company received a cash dividend payment of $59,000 from AKA during the three months ended September 30, 2017. The Company's revenue from sales to AKA for the three months ended September 30, 2017 , and 2016 , was $0.9 million and $0.6 million , respectively. The Company's revenue from sales to AKA for both the six months ended September 30, 2017 and 2016 , was $1.7 million . Accounts receivable from AKA was $0.2 million and $0.5 million as of September 30, 2017 , and March 31, 2017 , respectively. Deferred revenue, which primarily relates to AKA maintenance contracts, was $1.7 million and $2.8 million as of September 30, 2017 , and March 31, 2017 , respectively. The Company also has provided an unlimited guarantee for the performance of the other 50% owner in AKA, which primarily provides support and engineering services to the customer. This guarantee was put in place at the request of the AKA customer. The guarantee, which is estimated to have a maximum potential future payment of $0.7 million , will stay in place as long as the contract between AKA and the customer is in place. The Company would have recourse against the other 50% owner in AKA in the event the guarantee is triggered. The Company determined that it could perform on the obligation it guaranteed at a positive rate of return and, therefore, did not assign value to the guarantee. The Company's exposure to loss as a result of its involvement with AKA, exclusive of lost profits, is limited to the items noted above.

Income Taxes (Notes)

Income Taxes (Notes)	6 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes At the end of each interim period, the Company makes its best estimate of the effective tax rate expected to be applicable for the full fiscal year and uses that rate to provide for income taxes on a current year-to-date basis before discrete items. If a reliable estimate cannot be made, the Company may make a reasonable estimate of the annual effective tax rate, including use of the actual effective rate for the year-to-date. The impact of discrete items is recorded in the quarter in which they occur. The Company utilizes the liability method of accounting for income taxes and deferred taxes, which are determined based on the differences between the financial statements and tax basis of assets and liabilities given the enacted tax laws. The Company evaluates the need for valuation allowances on the net deferred tax assets under the rules of ASC 740, Income Taxes. In assessing the realizability of the Company's deferred tax assets, the Company considers whether it is more likely than not that some or all of the deferred tax assets will be realized through the generation of future taxable income. In making this determination, the Company assessed all of the evidence available at the time, including recent earnings, forecasted income projections and historical performance. The Company determined that the negative evidence outweighed the objectively verifiable positive evidence and previously recorded a full valuation allowance against deferred tax assets. The Company will continue to reassess realizability going forward. The Company recorded $13,000 and $25,000 of income tax expense in the three and six months ended September 30, 2017 , respectively, using an effective income tax rate of (1.07)% plus discrete items. The Company recorded $8,000 and $10,000 of income tax expense in the three and six months ended September 30, 2016 , respectively, using an effective rate of (0.10)% plus discrete items. The effective rate is impacted by the intraperiod allocation as a result of loss from continuing operations and income from discontinued operations, loss in a foreign jurisdiction with no valuation allowance, and states that base tax on gross margin and not pretax income.

Commitments and Contingencies (

Commitments and Contingencies (Notes)	6 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation and Contingency Reserves The Company and its subsidiaries are involved in various assertions, claims, proceedings and requests for indemnification concerning intellectual property, including patent infringement suits involving technologies that may be incorporated in the Company’s products, which are being handled and defended in the ordinary course of business. These matters are in various stages of investigation and litigation, and they are being vigorously defended. Although the Company does not expect that the outcome in any of these matters, individually or collectively, will have a material adverse effect on its financial condition or results of operations, litigation is inherently unpredictable. Therefore, judgments could be rendered, or settlements entered, that could adversely affect the Company’s operating results or cash flows in a particular period. The Company routinely assesses all of its litigation and threatened litigation as to the probability of ultimately incurring a liability, and it records its best estimate of the ultimate loss in situations where it assesses the likelihood of loss as probable. As of September 30, 2017 , and March 31, 2017 , the Company has not recorded any contingent liability attributable to existing litigation. In the ordinary course of operations, the Company receives claims where the Company believes an unfavorable outcome is possible and/or for which is probable and no estimate of possible losses can currently be made. A significant customer was a defendant in patent infringement claims and is asserting possible indemnity rights under contracts with the Company. The customer has settled one matter, which has been dismissed, and won summary judgment of all claims in the other. The customer has informed the Company that the customer intends to seek to recover from the Company a share of the settlement and defense costs. The Company has not been involved in any settlement discussions nor informed by the customer of any settlement details and therefore management is currently unable to estimate a range of potential loss associated with this claim with any degree of certainty, and the Company is not yet able to calculate the exposure to this claim, which will vary depending upon the settlement reached by the customer and the Company's contribution ratio.

Short-term Investments (Notes)

Short-term Investments (Notes)	6 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Short Term Investments [Text Block]	Short-term Investments As of September 30, 2017 , the Company owned Certificates of Deposit amounting to $5.0 million held at cost There were no short-term investments as of March 31, 2017 .

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	6 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined by ASC 820, Fair Value Measurements and Disclosures (ASC 820) , as the price that would be received upon selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 establishes a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows: • Level 1 – Quoted prices in active markets for identical assets and liabilities. • Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs. The Company’s money market funds are measured using Level 1 inputs. The following table presents available-for-sale securities measured at fair value on a recurring basis as of September 30, 2017 : (in thousands) Total Fair Value Quoted Prices in Significant Other Significant Balance Sheet Assets: Money market funds $ 11,960 $ 11,960 — — Cash and cash The following table presents available-for-sale securities measured at fair value on a recurring basis as of March 31, 2017 : (in thousands) Total Fair Value Quoted Prices in Significant Other Significant Balance Sheet Assets: Money market funds $ 17,162 $ 17,162 — — Cash and cash The fair value of the money market funds approximates their carrying amounts due to the short-term nature of these financial assets.

Share Repurchases (Notes)

Share Repurchases (Notes)	6 Months Ended
	Sep. 30, 2017
Payments for Repurchase of Equity [Abstract]
Share Repurchases	Share Repurchases In May 2017, the Board of Directors authorized a new share repurchase program whereby the Company may repurchase up to an aggregate of $2.0 million of its outstanding Class A Common Stock (the 2017 authorization). The 2017 authorization is in addition to the $0.1 million that was remaining from the August 2011 $20.0 million authorization (the 2011 authorization). There were 113,484 shares repurchased under the 2011 and 2017 authorizations during the six months ended September 30, 2017 at a weighted average purchase price of $2.99 per share. There were no shares repurchased under the 2011 authorization during the six months ended September 30, 2016. There was approximately $1.8 million remaining for additional share repurchases under the 2017 authorization as of September 30, 2017 . Additionally, in the six months ended September 30, 2017, and September 30, 2016, the Company repurchased 39,269 and 41,544 shares of Class A Common Stock, respectively, from certain employees that were surrendered to satisfy the minimum statutory tax withholding obligations on the vesting of restricted stock, RSUs and PSUs. These repurchases were not included in the authorized share repurchase programs and had a weighted-average purchase price of $2.91 and $3.40 per share, respectively.

Intangibles Assets (Notes)

Intangibles Assets (Notes)	6 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets Disclosure [Text Block]	Intangible Assets Intangible assets include customer relationships, trade names, developed technology and other intangibles. Intangible assets with determinable lives are amortized over their estimated useful lives. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Determination of recoverability is based on an estimate of undiscounted future cash flows resulting from the use of the asset and its eventual disposition. If the carrying amount of an asset exceeds its estimated future undiscounted cash flows, an impairment loss is recorded for the excess of the asset’s carrying amount over its fair value. Intangible asset impairment charges are presented in Intangible amortization on the Condensed Consolidated Statements of Operations. There was no intangible asset impairment during the six months ended September 30, 2017 , or September 30, 2016, for the IBW, ISMS and CNS reporting units.

Accrued Liabilities (Notes)

Accrued Liabilities (Notes)	6 Months Ended
	Sep. 30, 2017
Schedule of Accrued Liabilities [Table Text Block]	Accrued Expenses The components of accrued expenses are as follows: (in thousands) September 30, 2017 March 31, 2017 Accrued compensation $ 1,032 $ 1,256 Accrued contractual obligation 1,445 1,445 Other accrued expenses 1,346 1,572 Total accrued expenses $ 3,823 $ 4,273

Land Property and Equipment (No

Land Property and Equipment (Notes)	6 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Disclosure [Text Block]	Land, Property, and Equipment Long-lived assets consist of property and equipment. Long-lived assets that are held and used should be reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the long-lived assets might not be recoverable. Due to a significant adverse change in the business climate connected to the ClearLink DAS development project, the Company determined indicators of impairment were present as of June 30, 2016. The Company determined that equipment related to development and manufacturing of this product was fully impaired and recorded an impairment charge of $1.2 million in the six months ended September 30, 2016. Long-lived asset impairment charges are presented in Long-lived assets impairment on the Condensed Consolidated Statements of Operations. See Note 2 Restructuring Charges . There was no long-lived asset impairment during the six months ended September 30, 2017 , or the three months ended September 30, 2016. The components of fixed assets are as follows: (in thousands) September 30, 2017 March 31, 2017 Land $ 672 $ 672 Machinery and equipment 1,603 1,698 Office, computer and research equipment 5,522 6,012 Leasehold improvements 1,268 7,680 Land, property and equipment, gross $ 9,065 $ 16,062 Less accumulated depreciation and amortization (7,267 ) (14,078 ) Land, property and equipment, net $ 1,798 $ 1,984 The significant decrease in the gross fixed assets and accumulated depreciation is primarily related to the disposals of fully depreciated leasehold improvements associated with a building operating lease that ended on September 30, 2017.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed consolidated financial statements	The accompanying Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. The Condensed Consolidated Financial Statements have been prepared using generally accepted accounting principles (GAAP) in the United States for interim financial reporting, and consistent with the instructions of Form 10-Q and Article 10 of Regulation S-X and, accordingly, they do not include all of the information and footnotes required in the annual consolidated financial statements and accompanying footnotes. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended March 31, 2017 . All intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	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 that affect revenue and expenses during the periods reported. Estimates are used when accounting for the allowance for uncollectible accounts receivable, net realizable value of inventory, product warranty accrued, relative selling prices, stock-based compensation, intangible assets fair value, depreciation, income taxes, and contingencies, among other things. Actual results could differ from those estimates.
New Accounting Pronouncements	Recently Adopted Accounting Pronouncements In July 2015, the FASB issued ASU 2015-11, Simplifying the Measurement of Inventory (ASU 2015-11). The core principle of the guidance is that an entity should measure inventory at the "lower of cost and net realizable value" and options that currently exist for "market value" will be eliminated. The ASU defines net realizable value as the "estimated selling prices in the ordinary course of business, less reasonably predictable cost of completion, disposal, and transportation." The Company adopted ASU 2015-11 on April 1, 2017. The adoption of this ASU did not have a material impact to the Company's Consolidated Financial Statements or related disclosures. In the fourth quarter of fiscal year 2017, the Company adopted ASU 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (ASU 2014-15). ASU 2014-15 provides guidance on management’s responsibility in evaluating whether there is substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. For each annual and interim reporting period, management is required to evaluate whether there are conditions or events that raise substantial doubt about a company’s ability to continue as a going concern within one year from the date the financial statements are issued. The adoption of ASU 2014-15 had no significant effect on its Consolidated Financial Statements or related disclosures as of September 30, 2017 . Recently Issued Accounting Pronouncements Not Yet Adopted In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting (ASU 2017-09). ASU 2017-09 clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The standard is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. The Company is currently evaluating the potential impact ASU 2017-09 will have on the Company's Consolidated Financial Statements. In October 2016, the FASB issued ASU 2016-16, Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory (ASU 2016-16). ASU 2016-16 requires the recognition of current and deferred income taxes for intra-entity asset transfers when the transaction occurs. ASU 2016-16 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted. ASU 2016-16 is effective for the Company in the first quarter of fiscal 2019, and the Company is currently in the process of evaluating the potential impact of adoption of this updated authoritative guidance on the Company's Consolidated Financial Statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flow (Topic 230) (ASU 2016-15). This update is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The update provides new guidance regarding the classification of debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, distributions received from equity method investments, beneficial interests in securitized transactions, and separately identifiable cash flows and application of the predominance principle. This standard will be effective for financial statements issued by public companies for the annual and interim periods beginning after December 15, 2017. Early adoption of the standard is permitted. The standard will be applied in a retrospective approach for each period presented. The Company is currently evaluating the potential impact ASU 2016-15 will have on the Company's Consolidated Financial Statements and related disclosures. In February 2016, the FASB issued ASU 2016-02, Leases (ASU 2016-02). In September 2017, the FASB issued ASU 2017-13, Revenue Recognition (Topic 605), Revenue from Contracts with Customers (Topic 606), Leases (Topic 840), and Leases (Topic 842) (ASU 2017-13), which provides additional implementation guidance on the previously issued ASU 2016-02. ASU 2016-02 requires lessees to recognize leases on the balance sheet as a lease liability with a corresponding right-of-use asset for leases with a lease term of more than one year. ASU 2016-02 is effective for financial statements issued for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new standard requires a modified retrospective transition for capital or operating leases existing at or entered into after the beginning of the earliest comparative period presented in the financial statements, but it does not require transition accounting for leases that expire prior to the date of initial application. The Company is currently evaluating the impact that ASU 2016-02 will have on the Company's Consolidated Financial Statements and related disclosures. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (ASU 2014-09), that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 is based on the principle that an entity should recognize revenue to depict the transfer of 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. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract. Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard. ASU 2014-09 is initially scheduled to become effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period; early adoption is not permitted. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606) — Deferral of the Effective Date (ASU 2015-14) , which defers the effective date of ASU 2014-09 for one year and permits early adoption as early as the original effective date of ASU 2014-09. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. In 2016, the FASB issued additional guidance to clarify the implementation guidance (ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ; ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ; ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients: and ASU 2016-20 (Topic 606) Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers . In September 2017, the FASB issued ASU 2017-13. These amendments provide additional clarification and implementation guidance on the previously issued ASU 2014-09.
Inventory	Inventories are stated at the lower of first-in, first-out cost or market value.
Fair Value Measurement	Fair value is defined by ASC 820, Fair Value Measurements and Disclosures (ASC 820) , as the price that would be received upon selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 establishes a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows: • Level 1 – Quoted prices in active markets for identical assets and liabilities. • Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

Restructuring Charge (Tables)

Restructuring Charge (Tables)	6 Months Ended
	Sep. 30, 2017
Restructuring Charges [Abstract]
Restructuring charges	Total liability for restructuring charges and their utilization for the six months ended September 30, 2017 , are summarized as follows: Six months ended September 30, 2017 (in thousands) Employee-related Other costs Total Liability at beginning of period $ — $ 1,234 $ 1,234 Charged 165 — 165 Paid (19 ) (965 ) (984 ) Liability at end of period $ 146 $ 269 $ 415

Interim Segment Information (Ta

Interim Segment Information (Tables)	6 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment information	Segment information for the three and six months ended September 30, 2017 , and 2016 , is set forth below: Three months ended September 30, 2017 (in thousands) IBW ISMS CNS Total Revenue $ 7,919 $ 4,730 $ 4,583 $ 17,232 Cost of revenue 4,269 2,511 3,177 9,957 Gross profit 3,650 2,219 1,406 7,275 Gross margin 46.1 % 46.9 % 30.7 % 42.2 % Research and development 1,443 523 239 2,205 Segment profit $ 2,207 $ 1,696 $ 1,167 5,070 Operating expenses: Sales and marketing 1,992 General and administrative 1,809 Intangible amortization 1,048 Restructuring 165 Long-lived assets impairment — Operating profit (loss) 56 Other income, net 677 Income tax expense (13 ) Net income (loss) $ 720 Three months ended September 30, 2016 (in thousands) IBW ISMS CNS Total Revenue $ 6,644 $ 5,109 $ 6,027 $ 17,780 Cost of revenue 4,411 (1) 2,702 4,300 11,413 (1) Gross profit 2,233 (1) 2,407 1,727 6,367 (1) Gross margin 33.6 % (1) 47.1 % 28.7 % 35.8 % (1) Research and development 1,594 1,237 496 3,327 Segment profit $ 639 $ 1,170 $ 1,231 3,040 Operating expenses: Sales and marketing 2,896 General and administrative 2,218 Intangible amortization 1,201 Restructuring 2,601 Long-lived assets impairment — Operating profit (loss) (5,876 ) Other income, net 74 Income tax expense (8 ) Net income (loss) $ (5,810 ) (1) The three and six months ended September 30, 2016, includes E&O expense for ClearLink DAS inventory and pipeline inventory. See Note 2, Restructuring Charges . Six months ended September 30, 2017 (in thousands) IBW ISMS CNS Total Revenue $ 14,875 $ 8,860 $ 10,071 $ 33,806 Cost of revenue 8,211 4,515 7,038 19,764 Gross profit 6,664 4,345 3,033 14,042 Gross margin 44.8 % 49.0 % 30.1 % 41.5 % Research and development 2,906 1,088 487 4,481 Segment profit $ 3,758 $ 3,257 $ 2,546 9,561 Operating expenses: Sales and marketing 4,328 General and administrative 3,520 Intangible amortization 2,095 Restructuring 165 Long-lived assets impairment — Operating profit (loss) (547 ) Other income, net 720 Income tax expense (25 ) Net income (loss) $ 148 Six months ended September 30, 2016 (in thousands) IBW ISMS CNS Total Revenue $ 12,765 $ 9,248 $ 10,583 $ 32,596 Cost of revenue 9,538 (1) 4,822 7,304 21,664 (1) Gross profit 3,227 (1) 4,426 3,279 10,932 (1) Gross margin 25.3 % (1) 47.9 % 31.0 % 33.5 % (1) Research and development 3,958 2,531 1,115 7,604 Segment profit (loss) $ (731 ) $ 1,895 $ 2,164 3,328 Operating expenses: Sales and marketing 6,277 General and administrative 4,563 Intangible amortization 2,401 Restructuring 2,565 Long-lived assets impairment 1,181 Operating profit (loss) (13,659 ) Other income, net 91 Income tax expense (10 ) Net income (loss) $ (13,578 ) (1) The three and six months ended September 30, 2016, includes E&O expense for ClearLink DAS inventory and pipeline inventory. See Note 2 , Restructuring Charges .

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Sep. 30, 2017
Inventory, Net [Abstract]
Components of inventories	The components of inventories are as follows: (in thousands) September 30, 2017 March 31, 2017 Raw materials $ 3,634 $ 3,871 Work-in-process — — Finished goods 6,349 8,640 Total inventories $ 9,983 $ 12,511

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Sep. 30, 2017
Share-based Compensation [Abstract]
Stock-based compensation expense	The following table is a summary of total stock-based compensation expense resulting from stock options, restricted stock, RSUs and PSUs, during the three and six months ended September 30, 2017 , and 2016 : Three months ended September 30, Six months ended September 30, (in thousands) 2017 2016 2017 2016 Stock-based compensation expense $ 342 $ 687 $ 672 $ 1,093 Income tax benefit — — — — Total stock-based compensation expense, after taxes $ 342 $ 687 $ 672 $ 1,093
Stock option activity	Stock option activity for the six months ended September 30, 2017 , is as follows: Shares Weighted-Average Exercise Price Per Share Weighted-Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (1) (in thousands) Outstanding on March 31, 2017 362,396 $ 4.89 5.4 $ 39 Granted 100,000 3.06 Exercised — — Forfeited (97,399 ) 4.38 Expired (30,501 ) 6.83 Outstanding on September 30, 2017 334,496 $ 4.32 5.1 $ 12 (1) The intrinsic value for the stock options is calculated based on the difference between the exercise price of the underlying awards and the Westell Technologies’ closing stock price as of the respective reporting date
Restricted stock activity	Restricted Stock The following table sets forth restricted stock activity for the six months ended September 30, 2017 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2017 34,375 $ 4.11 Granted 104,636 3.01 Vested (66,250 ) 3.30 Forfeited — — Non-vested as of September 30, 2017 72,761 $ 3.26 RSUs The following table sets forth the RSU activity for the six months ended September 30, 2017 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2017 373,886 $ 4.48 Granted 527,000 2.84 Vested (111,954 ) 5.27 Forfeited (189,609 ) 3.79 Non-vested as of September 30, 2017 599,323 $ 3.10 PSUs The following table sets forth the PSU activity for the six months ended September 30, 2017 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2017 (at target) 76,053 $ 3.56 Granted, at target 40,000 2.63 Vested (2,343 ) 10.22 Forfeited (18,864 ) 2.17 Non-vested as of September 30, 2017 (at target) 94,846 $ 3.29

Product Warranties (Tables)

Product Warranties (Tables)	6 Months Ended
	Sep. 30, 2017
Product Warranties Disclosures [Abstract]
Changes in Company's product warranty reserve	The following table presents the changes in the Company’s product warranty reserve: Three months ended September 30, Six months ended September 30, (in thousands) 2017 2016 2017 2016 Total product warranty reserve at the beginning of the period $ 385 $ 439 $ 395 $ 436 Warranty expense to cost of revenue 105 33 118 67 Utilization (44 ) (12 ) (67 ) (43 ) Total product warranty reserve at the end of the period $ 446 $ 460 $ 446 $ 460

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	The following table presents available-for-sale securities measured at fair value on a recurring basis as of September 30, 2017 : (in thousands) Total Fair Value Quoted Prices in Significant Other Significant Balance Sheet Assets: Money market funds $ 11,960 $ 11,960 — — Cash and cash The following table presents available-for-sale securities measured at fair value on a recurring basis as of March 31, 2017 : (in thousands) Total Fair Value Quoted Prices in Significant Other Significant Balance Sheet Assets: Money market funds $ 17,162 $ 17,162 — — Cash and cash

Land Property and Equipment (Ta

Land Property and Equipment (Tables)	6 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Table Text Block]	The components of fixed assets are as follows: (in thousands) September 30, 2017 March 31, 2017 Land $ 672 $ 672 Machinery and equipment 1,603 1,698 Office, computer and research equipment 5,522 6,012 Leasehold improvements 1,268 7,680 Land, property and equipment, gross $ 9,065 $ 16,062 Less accumulated depreciation and amortization (7,267 ) (14,078 ) Land, property and equipment, net $ 1,798 $ 1,984

Basis of Presentation (Details

Basis of Presentation (Details Textual) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Sep. 30, 2017	Sep. 30, 2017
Business Acquisition [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	[1]	$ 608	$ 608
[1]	During the quarter ended September 30, 2017, the Company dissolved the NoranTel legal entity, which triggered a one-time foreign currency gain with the reversal of a cumulative translation adjustment. See Note 1.

Restructuring Charge (Details)

Restructuring Charge (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Restructuring charges
Liability at beginning of period			$ 1,234
Restructuring Charges	$ 165	$ 2,601	165	$ 2,565	$ 3,200
Paid			(984)
Liability at end of period	415		415		1,234
Employee Severance [Member]
Restructuring charges
Liability at beginning of period			0
Restructuring Charges			165		1,300
Paid			(19)
Liability at end of period	146		146		0
Other Restructuring [Member]
Restructuring charges
Liability at beginning of period			1,234
Restructuring Charges			0
Paid			(965)
Liability at end of period	$ 269		$ 269		$ 1,234

Restructuring Charge (Details T

Restructuring Charge (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 0	$ 0	$ 0	$ 1,181,000
Production Related Impairments or Charges		200	0	1,600,000
Impairment of Leasehold					$ 1,200,000
Restructuring	165,000	$ 2,601,000	165,000	$ 2,565,000	3,200,000
restructuringexpenseconsultants					700,000
Unpaid balance of restructuring charges	415,000		415,000		1,234,000
Restructuring Reserve, Noncurrent	0		0		63,000
Restructuring Reserve, Current	415,000		415,000		1,171,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			165,000		1,300,000
Unpaid balance of restructuring charges	146,000		146,000		0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			0
Unpaid balance of restructuring charges	$ 269,000		$ 269,000		$ 1,234,000

Interim Segment Information (De

Interim Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended				12 Months Ended
	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016		Mar. 31, 2017
Segment information
Total revenue	$ 17,232		$ 17,780		$ 33,806		$ 32,596
Total cost of revenue (1)	9,957		11,413	[1]	19,764		21,664	[1]
Gross profit	$ 7,275		$ 6,367	[1]	$ 14,042		$ 10,932	[1]
Gross margin	42.20%		35.80%	[1]	41.50%		33.50%	[1]
Research and development	$ 2,205		$ 3,327		$ 4,481		$ 7,604
Segment Profit Loss	5,070		3,040		9,561		3,328
Operating expenses
Sales and marketing	1,992		2,896		4,328		6,277
General and administrative	1,809		2,218		3,520		4,563
Intangible amortization	1,048		1,201		2,095		2,401
Restructuring	165		2,601		165		2,565		$ 3,200
Impairment of Long-Lived Assets to be Disposed of	0		0		0		1,181
Operating profit (loss)	56		(5,876)		(547)		(13,659)
Other Nonoperating Income (Expense)	677	[2]	74		720	[2]	91
Income tax expense	(13)		(8)		(25)		(10)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	720		(5,810)		148		(13,578)
IBW [Member]
Segment information
Total revenue	7,919		6,644		14,875		12,765
Total cost of revenue (1)	4,269		4,411	[1]	8,211		9,538	[1]
Gross profit	$ 3,650		$ 2,233	[1]	$ 6,664		$ 3,227	[1]
Gross margin	46.10%		33.60%	[1]	44.80%		25.30%	[1]
Research and development	$ 1,443		$ 1,594		$ 2,906		$ 3,958
Segment Profit Loss	2,207		639		3,758		(731)
ISMS [Member]
Segment information
Total revenue	4,730		5,109		8,860		9,248
Total cost of revenue (1)	2,511		2,702		4,515		4,822
Gross profit	$ 2,219		$ 2,407		$ 4,345		$ 4,426
Gross margin	46.90%		47.10%		49.00%		47.90%
Research and development	$ 523		$ 1,237		$ 1,088		$ 2,531
Segment Profit Loss	1,696		1,170		3,257		1,895
CNS [Member]
Segment information
Total revenue	4,583		6,027		10,071		10,583
Total cost of revenue (1)	3,177		4,300		7,038		7,304
Gross profit	$ 1,406		$ 1,727		$ 3,033		$ 3,279
Gross margin	30.70%		28.70%		30.10%		31.00%
Research and development	$ 239		$ 496		$ 487		$ 1,115
Segment Profit Loss	$ 1,167		$ 1,231		$ 2,546		$ 2,164
[1]	The three and six months ended September 30, 2016, includes $0.2 million and $1.6 million of E&O expense for ClearLink DAS inventory and pipeline inventory.
[2]	During the quarter ended September 30, 2017, the Company dissolved the NoranTel legal entity, which triggered a one-time foreign currency gain with the reversal of a cumulative translation adjustment. See Note 1.

Interim Segment Information (36

Interim Segment Information (Details Textual)	6 Months Ended
	Sep. 30, 2017segments
Segment Reporting [Abstract]
Number of Reportable Segments	3

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Components of inventories
Raw materials	$ 3,634	$ 3,871
Work-in-process	0	0
Finished goods	6,349	8,640
Total inventories	$ 9,983	$ 12,511

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock-based compensation expense
Stock-based compensation expense	$ 342	$ 687	$ 672	$ 1,093
Income tax benefit	0	0	0	0
Total stock-based compensation expense, after taxes	$ 342	$ 687	$ 672	$ 1,093

Stock-Based Compensation (Det39

Stock-Based Compensation (Details 1) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended	12 Months Ended
		Sep. 30, 2017	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding on March 31, 2017		362,396
Granted		100,000
Exercised		0
Forfeited		(97,399)
Expired		(30,501)
Outstanding on September 30, 2017		334,496	362,396
Weighted-Average Exercise Price Per Share, Outstanding on March 31, 2017		$ 4.89
Weighted-Average Exercise Price Per Share, Granted		3.06
Weighted-Average Exercise Price Per Share, Exercised		0
Weighted-Average Exercise Price Per Share, Forfeited		4.38
Weighted-Average Exercise Price Per Share, Expired		6.83
Weighted-Average Exercise Price Per Share, Outstanding on September 30, 2017		$ 4.32	$ 4.89
Weighted-Average Remaining Contractual Term (in years), Outstanding on March 31, 2017		5 years 26 days	5 years 4 months 24 days
Weighted-Average Remaining Contractual Term (in years), Outstanding on September 30, 2017		5 years 26 days	5 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding on March 31, 2017	[1]	$ 39
Aggregate Intrinsic Value, Outstanding on September 30, 2017	[1]	$ 12	$ 39
[1]	The intrinsic value for the stock options is calculated based on the difference between the exercise price of the underlying awards and the Westell Technologies’ closing stock price as of the respective reporting date

Stock-Based Compensation (Det40

Stock-Based Compensation (Details 2)	6 Months Ended
	Sep. 30, 2017$ / sharesshares
Restricted Stock [Member]
Restricted stock activity
Non-vested as of March 31, 2017 | shares	34,375
Granted | shares	104,636
Vested | shares	(66,250)
Forfeited | shares	0
Non-vested as of September 30, 2017 | shares	72,761
Weighted-Average Grant Date Fair Value, Non-vested as of March 31, 2017 | $ / shares	$ 4.11
Weighted-Average Grant Date Fair Value, Granted | $ / shares	3.01
Weighted-Average Grant Date Fair Value, Vested | $ / shares	3.30
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares	0
Weighted-Average Grant Date Fair Value, Non-vested as of September 30, 2017 | $ / shares	$ 3.26
Restricted Stock Units (RSUs) [Member]
Restricted stock activity
Non-vested as of March 31, 2017 | shares	373,886
Granted | shares	527,000
Vested | shares	(111,954)
Forfeited | shares	(189,609)
Non-vested as of September 30, 2017 | shares	599,323
Weighted-Average Grant Date Fair Value, Non-vested as of March 31, 2017 | $ / shares	$ 4.48
Weighted-Average Grant Date Fair Value, Granted | $ / shares	2.84
Weighted-Average Grant Date Fair Value, Vested | $ / shares	5.27
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares	3.79
Weighted-Average Grant Date Fair Value, Non-vested as of September 30, 2017 | $ / shares	$ 3.10
Performance Shares [Member]
Restricted stock activity
Non-vested as of March 31, 2017 | shares	76,053
Granted | shares	40,000
Vested | shares	(2,343)
Forfeited | shares	(18,864)
Non-vested as of September 30, 2017 | shares	94,846
Weighted-Average Grant Date Fair Value, Non-vested as of March 31, 2017 | $ / shares	$ 3.56
Weighted-Average Grant Date Fair Value, Granted | $ / shares	2.63
Weighted-Average Grant Date Fair Value, Vested | $ / shares	10.22
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares	2.17
Weighted-Average Grant Date Fair Value, Non-vested as of September 30, 2017 | $ / shares	$ 3.29

Stock-Based Compensation (Det41

Stock-Based Compensation (Details Textual)	6 Months Ended
	Sep. 30, 2017
2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule of equal annual installments	4 years
Restricted Stock Units (RSUs) [Member] | 2015 Omnibus Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule of equal annual installments	3 years
Restricted Stock [Member] | 2015 Omnibus Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule of equal annual installments	1 year

Product Warranties (Details)

Product Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in Company's standard product warranty reserve [Roll Forward]
Total product warranty reserve at the beginning of the period	$ 385	$ 439	$ 395	$ 436
Warranty expense to cost of revenue	105	33	118	67
Utilization	(44)	(12)	(67)	(43)
Total product warranty reserve at the end of the period	$ 446	$ 460	$ 446	$ 460

Product Warranties (Details Tex

Product Warranties (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2017	Mar. 31, 2017
Product Warranties (Textual) [Abstract]
Current portions of warranty reserve	$ 164	$ 163
Non-current portions of the warranty reserve	$ 282	$ 232
IBW [Member] | Minimum [Member]
Product Warranties (Textual) [Abstract]
Standard Product Warranty Description	P1Y
IBW [Member] | Maximum [Member]
Product Warranties (Textual) [Abstract]
Standard Product Warranty Description	P5Y
ISMS [Member]
Product Warranties (Textual) [Abstract]
Standard Product Warranty Description	P1Y
CNS [Member] | Minimum [Member]
Product Warranties (Textual) [Abstract]
Standard Product Warranty Description	P1Y
CNS [Member] | Maximum [Member]
Product Warranties (Textual) [Abstract]
Standard Product Warranty Description	P7Y

Variable Interest Entity and 44

Variable Interest Entity and Guarantee (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017	Apr. 02, 2013
Concentration Risk [Line Items]
Total revenue	$ 17,232	$ 17,780	$ 33,806	$ 32,596
AKA [Member]
Concentration Risk [Line Items]
Equity Method Investments	56		56		$ 111
Dividend Income, Operating	59
Total revenue	900	$ 600	1,700	$ 1,700
Accounts Receivable, Net, Current	200		200		500
Deferred Revenue	1,700		1,700		$ 2,800
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 700		$ 700
AKA [Member]
Concentration Risk [Line Items]
Equity Method Investment, Ownership Percentage						50.00%

Income Taxes (Details Textual)

Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Taxes (Textual) [Abstract]
Income tax expense	$ (13)	$ (8)	$ (25)	$ (10)
Effective tax rate			(1.07%)	(0.10%)

Short-term Investments (Details

Short-term Investments (Details) - USD ($)	Sep. 30, 2017	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Short-term Investments	$ 5,011,000	$ 0

Fair Value Measurements (Detail

Fair Value Measurements (Details) - Recurring [Member] - Cash and cash equivalents [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs
Money market funds	$ 11,960	$ 17,162
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs
Money market funds	$ 11,960	$ 17,162

Share Repurchases (Details Text

Share Repurchases (Details Textual) - Class A Common Stock - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	May 17, 2017	Mar. 31, 2017	Aug. 31, 2011
MayTwoThousandSeventeenAuthorization [Member]
Share Repurchases (Textual) [Abstract]
Stock Repurchase Program			$ 2
Treasury Stock, Shares, Acquired	113,484
Stock Repurchase Program Remaining Authorized Repurchases Amount	$ 1.8
Treasury stock acquired volume weighted-average price	$ 2.99
August 2011 authorization [Member]
Share Repurchases (Textual) [Abstract]
Stock Repurchase Program					$ 20
Treasury Stock, Shares, Acquired		0
Stock Repurchase Program Remaining Authorized Repurchases Amount				$ 0.1
Outside of Publically Announced Repurchase Program [Member]
Share Repurchases (Textual) [Abstract]
Treasury Stock, Shares, Acquired	39,269	41,544
Treasury stock acquired volume weighted-average price	$ 2.91	$ 3.40

Intangibles Assets (Details)

Intangibles Assets (Details) - USD ($)	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived	$ 0	$ 0

Accrued Liabilities (Details Te

Accrued Liabilities (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Accrued Liabilities [Abstract]
Employee-related Liabilities, Current	$ 1,032	$ 1,256
Liabilities of Business Transferred under Contractual Arrangement, Current	1,445	1,445
Other Liabilities	1,346	1,572
Accrued Liabilities, Current	$ 3,823	$ 4,273

Land Property and Equipment (De

Land Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Land	$ 672	$ 672
Machinery and equipment	1,603	1,698
Office, computer and research equipment	5,522	6,012
Leasehold improvements	1,268	7,680
Land, property and equipment, gross	9,065	16,062
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	7,267	14,078
Land, property and equipment, net	$ 1,798	$ 1,984

Land Property and Equipment Tex

Land Property and Equipment Textual (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Impairment of Intangible Assets, Finite-lived			$ 0	$ 0
Impairment of Long-Lived Assets to be Disposed of	$ 0	$ 0	$ 0	$ 1,181,000