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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Components of Loss Before Income Taxes

The components of loss before income taxes are as follows (in thousands):

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

Domestic

 

$

(15,681

)

 

$

(19,599

)

Foreign

 

 

 

 

 

 

Loss before income taxes

 

$

(15,681

)

 

$

(19,599

)

 

Provision for Income Taxes

 

The components of the provision for income taxes for the years ended December 31, 2017 and 2016 are as follows (in thousands):

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

Current:

 

 

 

 

 

 

 

 

Federal

 

$

 

 

$

 

State

 

 

2

 

 

 

1

 

Foreign

 

 

24

 

 

 

24

 

Total current tax expense

 

 

26

 

 

 

25

 

Deferred:

 

 

 

 

 

 

 

 

Federal

 

 

 

 

 

 

State

 

 

 

 

 

 

Foreign

 

 

 

 

 

 

Total deferred tax benefit

 

 

 

 

 

 

Total tax expense

 

$

26

 

 

$

25

 

 

Reconciliation of the Statutory Federal Income Tax Rate

The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate is as follows:

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

Expected income tax provision at the federal

   statutory rate

 

 

34.0

%

 

 

34.0

%

State taxes, net of federal benefit

 

 

2.6

%

 

 

4.7

%

Change in valuation allowance

 

 

91.4

%

 

 

(37.8

)%

Nondeductible expenses

 

 

0.1

%

 

 

(0.9

)%

Impact of change in federal tax rate

 

 

(124.6

)%

 

 

 

Withholding taxes

 

 

(0.2

)%

 

 

(0.1

)%

Other

 

 

(3.5

)%

 

 

 

Income tax provision

 

 

(0.2

)%

 

 

(0.1

)%

 

Deferred Tax Assets and Liabilities

Significant components of the Company’s deferred tax assets are as follows (in thousands)

 

 

As of December 31,

 

 

 

2017

 

 

2016

 

Deferred tax assets:

 

 

 

 

 

 

 

 

Net operating loss carryforwards

 

$

37,498

 

 

$

49,593

 

Unearned revenue

 

 

783

 

 

 

1,501

 

Stock-based compensation

 

 

2,273

 

 

 

2,861

 

Accrued payroll and benefits

 

 

51

 

 

 

215

 

Research and development credits

 

 

171

 

 

 

143

 

Capital loss carryover

 

 

 

 

 

13

 

Fixed asset basis difference

 

 

128

 

 

 

191

 

Inventory reserve

 

 

396

 

 

 

1,110

 

Charitable contributions

 

 

3

 

 

 

5

 

Total deferred tax assets

 

 

41,303

 

 

 

55,632

 

Less valuation allowance

 

 

(41,303

)

 

 

(55,632

)

Net deferred tax assets

 

$

 

 

$