Other long-term assets (Schedule of Carrying Amounts Related to Acquired Intangible Assets) (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
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| Other Long-term Assets Schedule Of Carrying Amounts Related To Acquired Intangible Assets | ||||
| Patents at January 1, 2018, net | $ 509,649 | |||
| Additions | 31,068 | |||
| Less: amortization expense | $ 15,000 | $ 17,000 | 29,219 | $ 35,000 |
| Patents at June 30, 2018, net | $ 511,498 | $ 511,498 | ||
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- Definition Additions. No definition available.
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| X | ||||||||||
- References No definition available.
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of the costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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