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Revenues (Tables)
 9 Months Ended
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue Our revenues from contracts with customers disaggregated by revenue source, excluding sales-based taxes, were as follows (in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
Product sales
 
$
88,068

 
$
84,816

 
$
269,288

 
$
266,057

Extended warranties and services
 
1,611

 
1,927

 
6,830

 
7,789

Other(1)
 
1,378

 
1,389

 
5,250

 
4,567

Net sales
 
$
91,057

 
$
88,132

 
$
281,368

 
$
278,413

(1) Other revenue is primarily freight and delivery and royalty income.

Our revenues disaggregated by geographic region, based on ship-to address, were as follows (in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
United States
 
$
81,423

 
$
74,597

 
$
250,502

 
$
242,365

Canada
 
4,306

 
6,984

 
13,372

 
17,701

All other
 
5,328

 
6,551

 
17,494

 
18,347

Net sales
 
$
91,057

 
$
88,132

 
$
281,368

 
$
278,413
Contract with Customer, Asset and Liability [Table Text Block] The following table provides information about our liabilities from contracts with customers, primarily customer deposits and deferred revenue, all of which are short-term in nature. The revenue recognized from contract liabilities and the remaining balances are shown below (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Balance, beginning of period
$
748

 
$
956

 
$
1,084

 
$
1,096

Cash additions
354

 
99

 
1,347

 
1,159

Revenue recognition
(227
)
 
(185
)
 
(1,556
)
 
(1,385
)
Balance, end of period
$
875

 
$
870

 
$
875

 
$
870