Description of Business and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Description of Business and Summary of Significant Accounting Policies  
Schedule of revenue from United States, Canada and all other international dealers and distributors combined

The following table sets forth revenue from U.S., Canadian and all other international dealers and distributors combined (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

December 31,

 

 

 

2016

    

2015

    

2014

 

Revenue-United States

 

$
148,803

 

$
109,435

 

$
98,276

 

Revenue-Canada

 

 
16,084

 

 
14,285

 

 
15,320

 

Revenue-all other international sources

 

 
43,915

 

 
39,459

 

 
35,204

 

Total revenue

 

$
208,802

 

$
163,179

 

$
148,800

 

International revenue (excluding Canada) as a percent of total revenue

 

 
21

%  

 
24

%  

 
24

%  

 

Schedule of changes in the product warranty liability

The following table presents the changes in the product warranty liability (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

December 31,

 

 

    

2016

    

2015

    

2014

 

Balance at the beginning of the period

 

$
1,415

 

$
1,191

 

$
1,213

 

Warranty costs accrued

 

 
2,458

 

 
2,068

 

 
1,145

 

Warranty claims

 

 
(1,928)

 

 
(1,844)

 

 
(1,167)

 

Balance at the end of the period

 

$
1,945

 

$
1,415

 

$
1,191

 

 

Schedule of reconciliation of the numerator and denominator used in the calculation of basic and diluted net income (loss) per share

The following table presents the reconciliation of the numerator and denominator used in the calculation of basic and diluted net income (loss) per share (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

December 31,

 

 

 

2016

    

2015

    

2014

 

Numerator:

 

 

 

 

 

 

 

 

 

 

Net income (loss)

 

$
12,954

 

$
(1,652)

 

$
8,156

 

Denominator:

 

 

 

 

 

 

 

 

 

 

Weighted average common stock outstanding for basic net income (loss) per common share

 

 
23,402

 

 
24,121

 

 
23,685

 

Effect of dilutive securities—stock options and restricted stock units

 

 
958

 

 

 —

 

 
1,961

 

Weighted average common shares and dilutive securities outstanding

 

 
24,360

 

 
24,121

 

 
25,646

 

 

Schedule of anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share

The following weighted-average common stock equivalents were anti-dilutive and therefore were excluded from the calculation of diluted net income (loss) per share (in thousands):

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

December 31,

 

 

 

2016

    

2015

    

2014

 

Options to purchase common stock

 
2,328

 
4,756

 
1,041

 

Restricted stock units

 
17

 
162

 

 —

 

Total

 
2,345

 
4,918

 
1,041

 

 

Schedule of changes in the allowance for doubtful accounts

The following table presents the changes in the allowance for doubtful accounts (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

December 31,

 

 

    

2016

    

2015

    

2014

 

Balance at beginning of period

 

$
824

 

$
705

 

$
605

 

Provision

 

 
345

 

 
345

 

 
229

 

Deductions

 

 
(188)

 

 
(226)

 

 
(129)

 

Balance at end of period

 

$
981

 

$
824

 

$
705

 

 

Schedule of estimated useful lives of property and equipment

 

 

 

 

 

 

Computer equipment and software

 
3

-

4

years

Manufacturing tooling and test equipment

 
2

-

4

years

Lab and warehouse equipment

 
2

-

4

years

Furniture and fixtures

    
2

-

5

years

Other

 
2

-

3

years