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Income Taxes (Tables)
12 Months Ended
May 31, 2018
Income Tax Disclosure [Abstract]  
Components of income (loss) before income tax provision
The components of income (loss) before income tax (benefit) expense for the years ended May 31 are as follows:

 
2018
 
2017
 
2016
(in thousands)
 
Income (loss) before tax expense:

 

 

U.S.
$
6,274

 
$
8,825

 
$
(4,444
)
Non-U.S.
1,191

 
1,022

 
1,191

 
$
7,465

 
$
9,847

 
$
(3,253
)
Summary of Income tax (benefit) provision analyzed by category
Income tax (benefit) expense is comprised of the following:
 
2018
 
2017
 
2016
(in thousands)
 
Current

 

 

Federal
$
(148
)
 
$

 
$
34

State and local
152

 
141

 
103

Non U.S.
73

 
270

 
217

 
77

 
411

 
354

Deferred
(8,947
)
 
4,428

 
39,983

Income tax (benefit) expense
$
(8,870
)
 
$
4,839

 
$
40,337

Summary of deferred tax asset and liabilities
Temporary differences that give rise to deferred tax assets and liabilities are summarized as follows:
 
 
May 31, 2018
 
May 31, 2017
(in thousands)
 
Deferred tax assets

 

Net operating loss carryforward
$
33,880

 
$
55,975

Stock-based compensation
2,421

 
2,653

Federal and state R&D tax credit carryforward
3,644

 
2,548

Inventories
1,550

 
2,407

Expenses incurred not currently deductible
1,714

 
6,522

Accrued liabilities
277

 
1,289

Gross deferred tax asset
43,486

 
71,394

Deferred tax liabilities

 

Excess tax over book depreciation and amortization
34,044

 
49,158

 
34,044

 
49,158

Valuation Allowance
(26,607
)
 
(48,348
)
Net deferred tax liability (1)
$
(17,165
)
 
$
(26,112
)


(1) Net deferred tax liability is inclusive of a non-U.S. $0.08 million deferred tax asset that is included in other assets on the Company's balance sheet for the year ended May 31, 2018.
Summary of Income tax rate reconciliation
The Company's consolidated income tax expense has differed from the amount that would be provided by applying the U.S. Federal statutory income tax rate to the Company's income before income taxes for the following reasons:
 
Year ended May 31,
 
2018
 
2017
 
2016
(in thousands)
 
Income tax (benefit) expense at statutory tax rate of 28.6%, 35.0% and 35.0%, respectively
$
2,136

 
$
3,447

 
$
(1,139
)
Effect of graduated tax rates

 
(98
)
 
33

State income taxes, net of Federal tax benefit
120

 
(22
)
 
(215
)
Impact of Non-U.S. operations
(288
)
 
403

 
(162
)
Research and development tax credit
(951
)
 
(403
)
 
(499
)
Impact of tax reform
10,912

 

 

Meals and entertainment
242

 
266

 
329

Non-deductible interest on contingent payments

 
174

 
262

Non-taxable gain on revaluation of contingent consideration liability

 
(5,576
)
 
(170
)
Change in valuation allowance
(21,741
)
 
6,139

 
40,685

Effect of elimination of stock compensation APIC pool

 
1,380

 
739

IPR&D intangible write-off

 
(1,224
)
 

Other
700

 
353

 
474

Income tax (benefit) expense
$
(8,870
)
 
$
4,839

 
$
40,337

Summary of unrecognized tax benefits reconciliation
The following table provides a reconciliation of the beginning and ending amount of unrecognized tax benefits:
 
Year ended May 31,
 
2018
 
2017
 
2016
(in thousands)
 
Unrecognized tax benefits balance at June 1
$
899

 
$
899

 
$

Increase in gross amounts of tax positions related to prior years

 

 
899

Decrease in gross amounts of tax positions related to prior years due to U.S. tax reform
(287
)
 

 

Decrease due to lapse in statute of limitations
(148
)
 

 

Unrecognized tax benefits balance at May 31
$
464

 
$
899

 
$
899