5. Income Taxes

The following table sets forth our benefit for income taxes, along with the corresponding effective tax rates:

	Three Months Ended						Six Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
	(In thousands, except percentages)

Benefit for income taxes	$	650		$	92		$	899		$	141
Change in valuation allowance	(617		)	(84		)	(865		)	(134		)

Total benefit for income taxes	$	33		$	8		$	34		$	7

Effective tax rate	3.0		%	4.3		%	2.0		%	2.5		%

On an interim basis, we estimate what our anticipated annual effective tax rate will be, while also separately considering applicable discrete and other non-recurring items, and record a quarterly income tax provision in accordance with the anticipated annual rate. As the fiscal year progresses, we refine our estimates based on actual events and financial results during the year. This process can result in significant changes to our expected effective tax rate. When this occurs, we adjust our income tax provision during the quarter in which our estimates are refined so that the year-to-date provision reflects the expected annual effective tax rate. These changes, along with adjustments to our deferred taxes, among others, may create fluctuations in our overall effective tax rate from quarter to quarter.

In assessing the realizability of our deferred tax assets, we review all available positive and negative evidence, including reversal of deferred tax liabilities, potential carrybacks, projected future taxable income, tax planning strategies and recent financial performance. We have experienced a cumulative pre-tax loss over the trailing three years. As such, we consider it appropriate to continue to maintain a valuation allowance against our deferred tax assets. We will continuously reassess the appropriateness of maintaining a valuation allowance.