XML 26 R13.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Other Assets | 12 Months Ended
--- | ---
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Other Assets |
6. | Other Assets
Other assets consist of the following:
December 31, |  | 2018 |  |  | 2017 |
Patents, at cost |  | $ | 6,955 |  |  | $ | 6,814 |
Accumulated amortization |  |  | (4,491 | ) |  |  | (4,202 | )
Deposits on capital items |  |  | 12,106 |  |  |  | 7,958 |
Other |  |  | 3,093 |  |  |  | 3,169 |
|  | $ | 17,663 |  |  | $ | 13,739 |
The capitalized cost of patents is amortized using the straight-line method over their useful lives. The cost of patent amortization was $0.3 million, $0.3 million, and $0.3 million in 2018, 2017, and 2016, respectively. The estimated annual patent amortization cost for each of the next five years is $0.3 million. Costs incurred to maintain existing patents are charged to expense in the year incurred.

X
- References No definition available. + Details
Name: | us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for other assets. This disclosure includes other current assets and other noncurrent assets. + References No definition available. + Details
Name: | us-gaap_OtherAssetsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration