Income Taxes (Tables)
12 Months Ended
Dec. 31, 2015
Income Taxes  
Schedule of domestic and foreign components of net income (loss) before income tax expense

The domestic and foreign components of net income (loss) before income tax expense consists of the following for the periods shown below (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

December 31,

 

 

    

2013

    

2014

    

2015

 

Income (loss) before income taxes:

 

 

 

 

 

 

 

 

 

 

Domestic

 

$

3,633

 

$

7,464

 

$

(933)

 

Foreign

 

 

118

 

 

1,103

 

 

(451)

 

Total income (loss) before income taxes

 

$

3,751

 

$

8,567

 

$

(1,384)

 

 

Schedule of components of provision for income taxes

The provision for income taxes consisted of the following components (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

December 31,

 

 

    

2013

    

2014

    

2015

 

Current:

 

 

 

 

 

 

 

 

 

 

Domestic

 

 

 

 

 

 

 

 

 

 

Federal

 

$

64

 

$

76

 

$

154

 

State

 

 

53

 

 

52

 

 

45

 

Foreign

 

 

147

 

 

288

 

 

366

 

Total current tax expense

 

 

264

 

 

416

 

 

565

 

Deferred:

 

 

 

 

 

 

 

 

 

 

Domestic

 

 

 

 

 

 

 

 

 

 

Federal

 

 

1,572

 

 

1,761

 

 

822

 

State

 

 

44

 

 

30

 

 

5

 

Foreign

 

 

(16)

 

 

(5)

 

 

(296)

 

Valuation allowance

 

 

(1,616)

 

 

(1,791)

 

 

(828)

 

Total deferred tax benefit

 

 

(16)

 

 

(5)

 

 

(297)

 

Total income tax expense

 

$

248

 

$

411

 

$

268

 

 

Schedule of reconciliation from the U.S. statutory federal income tax rate to the effective income tax rate

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

December 31,

 

 

    

2013

    

2014

    

2015

 

Federal income tax rate

 

34.0

%  

34.0

%  

34.0

%  

State taxes, net of federal benefit

 

1.1

 

0.4

 

(2.1)

 

Stock-based compensation

 

22.7

 

(2.1)

 

(80.0)

 

Stock warrant

 

6.4

 

 —

 

 —

 

Research and development credits

 

(18.3)

 

(8.1)

 

 —

 

Change in valuation allowance

 

(42.0)

 

(20.6)

 

59.5

 

Non-deductible acquisition costs

 

 —

 

 —

 

(21.2)

 

Return to provision adjustments

 

(1.6)

 

(0.8)

 

10.6

 

Permanent items

 

4.0

 

2.9

 

(9.5)

 

Differences in foreign tax rates

 

2.2

 

(0.9)

 

(11.9)

 

Other, net

 

(1.9)

 

 —

 

1.2

 

Effective income tax rate

 

6.6

%  

4.8

%  

(19.4)

%  

 

Schedule of deferred tax assets and (liabilities)

Deferred tax assets and (liabilities) are comprised of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

December 31,

 

 

    

2014

    

2015

 

Deferred Tax Assets:

 

 

 

 

 

 

 

Reserves and accruals

 

$

1,449

 

$

1,968

 

Inventories

 

 

1,063

 

 

1,469

 

Net operating loss carryforwards

 

 

25,007

 

 

22,076

 

Property, plant and equipment

 

 

1,831

 

 

1,609

 

Intangible assets

 

 

 —

 

 

428

 

Stock-based compensation

 

 

1,540

 

 

2,727

 

Research and development credit carryforwards

 

 

5,243

 

 

5,366

 

Other

 

 

 —

 

 

73

 

Total deferred tax assets

 

 

36,133

 

 

35,716

 

Valuation allowance

 

 

(36,050)

 

 

(35,222)

 

Total deferred tax assets

 

 

83

 

 

494

 

Deferred Tax Liabilities:

 

 

 

 

 

 

 

Undistributed earnings of foreign subsidiaries

 

 

(56)

 

 

(109)

 

Intangible assets

 

 

(116)

 

 

 —

 

Property and equipment

 

 

(16)

 

 

 —

 

Total deferred tax liabilities

 

 

(188)

 

 

(109)

 

Net deferred tax asset (liability)

 

$

(105)

 

$

385

 

 

Schedule of net operating loss and tax credit carryforwards

Net operating loss and tax credit carryforwards as of December 31, 2015 are as follows (in thousands):

 

 

 

 

 

 

 

 

    

Amount

    

Expiration Years

 

Net operating losses, federal

 

$

78,135

 

2025 - 2035

 

Net operating losses, state

 

 

75,926

 

2019 - 2033

 

Tax credit carryforwards, federal

 

 

6,743

 

2023 - 2034

 

Tax credit carryforwards, state

 

 

2,799

 

2017 - 2028

 

Net operating losses, foreign

 

 

20

 

None

 

 

Schedule of reconciliation of the changes in the gross balance of unrecognized tax benefits, excluding interest and penalties

The following is a reconciliation of the changes in the gross balance of unrecognized tax benefits, excluding interest and penalties (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

December 31,

 

 

    

2013

    

2014

    

2015

 

Balance at the beginning of the period

 

$

2,318

 

$

2,943

 

$

3,583

 

Current year additions

 

 

625

 

 

640

 

 

 —

 

Balance at the end of the period

 

$

2,943

 

$

3,583

 

$

3,583