Description of Business and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
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 the U.S., Canadian and all other international dealers and distributors combined (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

December 31,

 

 

 

2013

    

2014

    

2015

 

Revenue-United States

 

$
84,474

 

$
98,276

 

$
109,435

 

Revenue-Canada

 

 
15,014

 

 
15,320

 

 
14,285

 

Revenue-all other international sources

 

 
29,023

 

 
35,204

 

 
39,459

 

Total revenue

 

$
128,511

 

$
148,800

 

$
163,179

 

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

 

 
23

%  

 
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,

 

 

    

2013

    

2014

    

2015

 

Balance at the beginning of the period

 

$
1,155

 

$
1,213

 

$
1,191

 

Warranty costs accrued

 

 
1,025

 

 
1,145

 

 
2,068

 

Warranty claims

 

 
(967)

 

 
(1,167)

 

 
(1,844)

 

Balance at the end of the period

 

$
1,213

 

$
1,191

 

$
1,415

 

 

Schedule of reconciliation of the numerator and denominator used in the calculation of basic and diluted net 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,

 

 

 

2013

    

2014

    

2015

 

Numerator:

 

 

 

 

 

 

 

 

 

 

Net income (loss)

 

$
3,503

 

$
8,156

 

$
(1,652)

 

Denominator:

 

 

 

 

 

 

 

 

 

 

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

 

 
10,609

 

 
23,685

 

 
24,121

 

Effect of dilutive securities—stock options, restricted stock units, and warrants to purchase common stock

 

 
11,654

 

 
1,961

 

 

 —

 

Weighted average common shares and dilutive securities outstanding

 

 
22,263

 

 
25,646

 

 
24,121

 

 

Schedule of anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net 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,

 

 

 

2013

    

2014

    

2015

 

Options to purchase common stock

 
356

 
1,041

 
4,756

 

Restricted stock units

 

 —

 

 —

 
162

 

Warrants to purchase common stock

 
1

 

 —

 

 —

 

Total

 
357

 
1,041

 
4,918

 

 

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,

 

 

    

2013

    

2014

    

2015

 

Balance at beginning of period

 

$
643

 

$
605

 

$
705

 

Provision

 

 
159

 

 
229

 

 
345

 

Deductions

 

 
(197)

 

 
(129)

 

 
(226)

 

Balance at end of period

 

$
605

 

$
705

 

$
824

 

 

Schedule of estimated useful lives of property and equipment

 

 

 

 

 

 

Furniture and fixtures

    
2

-
5

years

Manufacturing tooling and test equipment

 
2

-
3

years

Lab and warehouse equipment

 
2

-
4

years

Computer equipment and software

 
3

-
4

years

Marketing equipment

 
2

-
3

years