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Accounts Receivable - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Noncancelable Obligations Future Minimum Payments Due [Line Items] |  |  |  |  |
Accounts receivable, net | $ 6,681,697 |  | $ 6,681,697 |  | $ 2,101,941
Reserves for doubtful accounts | 4,631,593 |  | 4,631,593 |  | 4,820,593
Outstanding debt | 8,227,675 |  | 8,227,675 |  |
Marketing, general and administrative Related To project | 26,749 |  |  |  |
Contractual cost recoupment | 9,226,398 |  |  |  |
Operations and research | 9,199,649 |  |  |  |
Transaction cost of goods | 169,573 | 54,237 | 410,357 | 178,318 |
Neptune Minerals, Inc. [Member] |  |  |  |  |
Noncancelable Obligations Future Minimum Payments Due [Line Items] |  |  |  |  |
Loan made to NMI | 500,000 |  | 500,000 |  |
Gairsoppa [Member] |  |  |  |  |
Noncancelable Obligations Future Minimum Payments Due [Line Items] |  |  |  |  |
Accounts receivable, net | 14,444,948 |  | 14,444,948 |  |
Silver quantity | 61 |  |  |  |
Remaining amount of account receivable | 5,805,543 |  | 5,805,543 |  |
Transaction cost of goods | $ 0 |  |  |  |

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- Definition For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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