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Deferred Income and Revenue Participation Rights (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Deferred Revenue Arrangement [Line Items] |  |
Revenue participation rights | $ 3,818,750 | $ 4,643,750
"Cambridge" Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue participation rights |  | 825,000
"Seattle" Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue participation rights | 62,500 | 62,500
Galt Resources, LLC (HMS Victory project) [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue participation rights | $ 3,756,250 | $ 3,756,250

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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