Balance at

Charged to

Charged to

Balance at

Beginning

Costs and

Other

End of

Description

of Period

Expenses

Accounts

Deductions

Period

Year ended March 31, 2021

Reserves deducted from the asset to which they apply:

Reserve for doubtful accounts receivable

$

33

$

(4

)

$

—

$

—

$

29

Reserves included in the balance sheet caption "accrued

   expenses"

Product warranty liability

$

359

$

344

$

—

$

(77

)

$

626

Year ended March 31, 2020

Reserves deducted from the asset to which they apply:

Reserve for doubtful accounts receivable

$

33

$

—

$

—

$

—

$

33

Reserves included in the balance sheet caption "accrued

   expenses"

Product warranty liability

$

366

$

62

$

—

$

(69

)

$

359

Year ended March 31, 2019

Reserves deducted from the asset to which they apply:

Reserve for doubtful accounts receivable

$

339

$

(167

)

$

(13

)

$

(126

)

$

33

Reserves included in the balance sheet caption "accrued

   expenses"

Product warranty liability

$

493

$

234

$

(85

)

$

(276

)

$

366

Reserves included in the balance sheet caption "accrued

   compensation"

Restructuring reserve

$

18

$

—

$

—

$

(18

)

$

—