Balance at Beginning of Year

Charged to Cost and Expense (Recovery)

Deductions

Other Changes Add (Deduct)

Balance at

End of Year

Allowance for doubtful accounts and provision for unbilled receivables (deducted from accounts receivable):

Year ended January 31, 2013

$

87

$

(38

)

$

(25

)

$

—

$

24

Year ended January 31, 2012

$

119

$

(29

)

$

(3

)

$

—

$

87

Allowance for deferred tax assets:

Year ended January 31, 2013

$

17,130

$

—

$

—

$

619

$

17,749

Year ended January 31, 2012

$

15,121

$

—

$

—

$

2,009

$

17,130

Reserve for obsolete inventory:

Year ended January 31, 2013

$

1,792

$

—

$

—

$

(1,161

)

$

631

Year ended January 31, 2012

$

1,581

$

357

$

(146

)

$

—

$

1,792