Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation Basis of Presentation (Details 1)

v2.4.1.9
Basis of Presentation Basis of Presentation (Details 1) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Sales and marketing $ 2,719,000us-gaap_SellingAndMarketingExpense $ 3,205,000us-gaap_SellingAndMarketingExpense [1] $ 9,064,000us-gaap_SellingAndMarketingExpense $ 9,749,000us-gaap_SellingAndMarketingExpense [1]
SalesandMarketingAdjustmentUsingPreviousAccountingGuidance 168,000wstl_SalesandMarketingAdjustmentUsingPreviousAccountingGuidance   668,000wstl_SalesandMarketingAdjustmentUsingPreviousAccountingGuidance  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Income from Continuing Operations 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperations 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperations 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperations 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperations
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share $ 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare $ 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare $ 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare $ 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
Restatement Adjustment [Member]        
Business Acquisition [Line Items]        
Sales and marketing   $ (303,000)us-gaap_SellingAndMarketingExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		  $ (1,063,000)us-gaap_SellingAndMarketingExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
[1] Certain amounts have been reclassified to reflect a change in accounting principle. See Note 1.