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Other Assets
 6 Months Ended
Jun. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets Other Assets
Other assets consisted of the following at June 30, 2019 and December 31, 2018 (in thousands):
 
June 30, 2019
 
December 31, 2018
Cash surrender value of corporate-owned life insurance policies
$
4,018

 
$
3,596

Deferred commissions (1)
16,597

 
15,530

Restricted cash
660

 
661

Operating lease assets
10,770

 
—

Prepaid expenses, deposits and other
3,549

 
3,212

Total other long-term assets
$
35,594

 
$
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.