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Other Assets
 9 Months Ended
Sep. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets Other Assets
Other assets consisted of the following at September 30, 2019 and December 31, 2018 (in thousands):
 
September 30, 2019
 
December 31, 2018
Cash surrender value of corporate-owned life insurance policies
$
4,020

 
$
3,596

Deferred commissions (1)
17,920

 
15,530

Restricted cash
658

 
661

Operating lease assets
10,592

 
—

Prepaid expenses, deposits and other
3,952

 
3,212

Total other assets
$
37,142

 
$
22,999

(1) Represents the incremental costs of obtaining contracts with customers, which consist primarily of sales commissions. These costs are ascribed to or allocated to the underlying performance obligations in the contracts and amortized consistent with the recognition timing of the revenue for the underlying performance obligations.