Allowance for Doubtful Accounts

3 Months Ended

Apr. 30, 2012

Allowance for Doubtful Accounts

Allowance for Doubtful Accounts

(4) Allowance for Doubtful Accounts

        Allowance for doubtful accounts activity and balances are presented below:

	Fiscal Year Ended January 31,									Three Months Ended April 30,
(in thousands)	2010			2011			2012			2011			2012
										(Unaudited)
Balance at beginning of period	$	120		$	321		$	400		$	400		$	557
Add: bad debt expense		379			444			247			358			—
Less: write-offs, net of recoveries		(178	)		(365	)		(90	)		(9	)		—
Balance at end of period	$	321		$	400		$	557		$	749		$	557