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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Income before Income Tax, Domestic and Foreign Income from continuing operations before income taxes was as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
U.S.
$
19,109

 
$
34,259

 
$
50,651

Non-U.S.
1,892

 
1,446

 
930

 
$
21,001

 
$
35,705

 
$
51,581
Schedule of Components of Income Tax Expense (Benefit) Income tax expense from continuing operations was as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Current:
 
 
 
 
 
U.S. federal
$
1,750

 
$
14,409

 
$
6,765

U.S. state
477

 
1,887

 
318

Non-U.S.
435

 
330

 
118

Total current
2,662

 
16,626

 
7,201

Deferred:
 
 
 
 
 
U.S. federal
2,235

 
(9,418
)
 
8,130

U.S. state
1,059

 
819

 
1,037

Non-U.S.
(65
)
 
53

 
112

Total deferred
3,229

 
(8,546
)
 
9,279

 
$
5,891

 
$
8,080

 
$
16,480
Schedule of Effective Income Tax Rate Reconciliation Following is a reconciliation of the U.S. statutory federal income tax rate with our effective income tax rate for continuing operations:
 
Year Ended December 31,
 
2018
 
2017
 
2016
U.S. statutory income tax rate
21.0
 %
 
35.0
 %
 
35.0
 %
State tax, net of U.S. federal tax benefit
5.7

 
5.0

 
2.4

Non-U.S. income taxes
0.1

 
(0.1
)
 
0.3

Nondeductible operating expenses
3.1

 
0.8

 
0.3

Research and development credit
(3.1
)
 
(1.5
)
 
(1.0
)
Change in deferred tax measurement rate (1)
0.1

 
(15.3
)
 
(0.1
)
Change in uncertain tax positions
0.8

 
0.8

 
(5.1
)
Excess tax benefits from stock plans
(0.7
)
 
(2.1
)
 
—

Change in valuation allowance
1.8

 
0.1

 
0.2

Other
(0.7
)
 
(0.1
)
 
(0.1
)
Effective income tax rate
28.1
 %
 
22.6
 %
 
31.9
 %

(1) Effective income tax rate for 2017 includes impacts related to the Tax Cuts and Jobs Act (the “TCJA”).
Schedule of Deferred Tax Assets and Liabilities Individually significant components of deferred income tax assets and liabilities were as follows (in thousands):
 
As of December 31,
 
2018
 
2017
Deferred income tax assets:
 
 
 
Accrued liabilities
$
2,453

 
$
3,000

Allowance for doubtful accounts
23

 
12

Inventory valuation
424

 
254

Capitalized indirect inventory costs
442

 
383

Stock-based compensation expense
811

 
897

Deferred rent
520

 
588

Net operating loss carryforward
1,137

 
1,715

Basis difference on long-lived assets
608

 
548

Credit carryforward
747

 
634

Other
219

 
179

Gross deferred income tax assets
7,384

 
8,210

Valuation allowance
(1,247
)
 
(914
)
Deferred income tax assets, net of valuation allowance
6,137

 
7,296

Deferred income tax liabilities:
 
 
 
Prepaid advertising
(674
)
 
(370
)
Other prepaids
(762
)
 
(610
)
Basis difference of long-lived assets
(16,474
)
 
(14,856
)
Other
(4
)
 
(18
)
Deferred income tax liabilities
(17,914
)
 
(15,854
)
Net deferred income tax liabilities
$
(11,777
)
 
$
(8,558
)

Our net deferred income tax assets (liabilities) were recorded on our consolidated balance sheets as follows (in thousands):
 
As of December 31,
 
2018
 
2017
Deferred income tax assets, non-current (recorded in "other assets")
111

 
—

Deferred income tax liabilities, non-current
(11,888
)
 
(8,558
)
Net deferred income tax liabilities
$
(11,777
)
 
$
(8,558
)
Summary of Income Tax Carryforwards As of December 31, 2018, we had the following income tax carryforwards (in millions):
 
 
Amount
 
Expires in
Net operating loss carryforwards
 
 
 
 
U.S. state
 
$
21.5

 
2019 - 2031
China
 
$
0.5

 
2020 - 2022
Income tax credit carryforwards
 
 
 
 
U.S. Federal
 
$
—

 
2018 - 2035
U.S. state
 
$
1.0

 
2019 - 2031
Schedule of Reconciliatin of Gross Unrecognized Tax Benefits From Uncertain Tax Positions Roll Forward Following is a reconciliation of gross unrecognized tax benefits from uncertain tax positions, excluding the impact of penalties and interest (in thousands):
 
2018
 
2017
 
2016
Balance, January 1
$
2,194

 
$
1,970

 
$
2,519

Additions for tax positions taken in prior years
41

 
38

 
21

Reductions for tax positions taken in prior years
(4
)
 
(5
)
 
(523
)
Additions for tax positions related to the current year
116

 
211

 
83

Lapses of statutes of limitations
(12
)
 
(11
)
 
(130
)
Other
(5
)
 
(9
)
 
—

Balance, December 31
$
2,330

 
$
2,194

 
$
1,970