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Related party transactions (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 25, 2011 | Sep. 14, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Jul. 19, 2012 | Dec. 31, 2010 | Mar. 25, 2013 Chief Executive Officer [Member] | May 25, 2010 Chief Executive Officer [Member] Stock Option [Member] | Dec. 31, 2012 AJLR Partnership [Member] | Dec. 31, 2012 Estate Gold [Member] | Dec. 31, 2012 Related Party Compensation [Member] | May 25, 2010 NTR [Member] | May 25, 2010 NTR [Member] Stock Option [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to major customer, percent of revenues |  |  | 43.00% | 41.00% |  |  |  |  |  |  |  |  |
Payments to supplier, percent of purchases |  |  | 22.00% | 23.00% |  |  |  |  |  |  |  |  |
Due to NTR |  |  | $ 1,278,000 |  |  |  |  |  |  |  |  |  |
Credit facility amount, maximum |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |
Outstanding balance of credit facility |  |  | 3,583,358 |  |  |  |  |  |  |  |  |  |
Interest rate, credit |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Acquired ownership percentage of SBT |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Consideration paid for acquisition of shares |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |
Shares issued in SBT business acquisition |  | 600,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price | $ 15.0 |  | $ 14.21 | $ 13.76 |  | $ 2.01 |  |  |  |  |  |  | $ 6.0
Options granted | 5,000,000 |  |  | 5,000,000 |  |  |  | 1,628,014 |  |  |  | 3,000,000 | 1,000,000
Expiration date of options | Oct. 25, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Payables forgiven | 2,500,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Shares issued upon debt forgiveness | 5,000,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |
Loss on settlement of debt with related party |  | (1,720,000) |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  | 12,175,584 | 12,163,943 |  |  | 1,520,812 |  |  |  |  |  |
Purchases from related party |  |  |  |  |  |  |  |  | 2,084,727 | 96,116 |  |  |
Proceeds from related party |  |  |  |  |  |  |  |  |  | 183,650 |  |  |
Related party revenue |  |  |  |  |  |  |  |  | 415,527 | 274,624 |  |  |
Related party transaction amount |  |  |  |  |  |  |  |  |  |  | 176,733 |  |
Stock based compensation |  |  |  | 2,640,713 |  |  |  |  |  |  |  |  |
Fair value of NTR Options | $ 5,140,713 |  |  |  |  |  |  |  |  |  |  |  |

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