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Concentrations and Credit Risk | 3 Months Ended
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Mar. 31, 2018
Concentrations and Credit Risk [Text Block] |
21. | Concentrations and Credit Risk
| (a) | Concentrations
The Company had the following customers that individually comprised 10% or more of net revenue for the three months ended March 31, 2017 and 2018 as follows:
|  |  | Three months ended March 31, |
|  |  | 2017 |  |  |  |  |  | 2018 |  |  |  |
| Customer A | $ | * |  |  | * |  | $ | 1,162,051 |  |  | 35.08% |
| Customer B |  | * |  |  | * |  |  | 693,347 |  |  | 20.93% |
| Customer C |  | * |  |  | * |  |  | 383,773 |  |  | 11.58% |
| Customer D |  | * |  |  | * |  |  | 374,213 |  |  | 11.30% |
| Customer E |  | 3,110,679 |  |  | 83.71% |  |  | * |  |  | * |
| * Comprised less than 10% of net revenue for the respective period.
| The Company had the following customers that individually comprised 10% or more of accounts receivable as of December 31, 2017 and March 31, 2018 as follows:
|  |  | December 31, 2017 |  |  |  |  |  | March 31, 2018 |  |  |  |
| Customer F | $ | 23,835,201 |  |  | 62.08% |  | $ | 24,711,459 |  |  | 74.8% |
| Customer G |  | 4,855,518 |  |  | 12.65% |  |  | 3,870,731 |  |  | 11.7% |
| Customer H |  | 4,664,285 |  |  | 12.15% |  |  | * |  |  | * |
* Comprised less than 10% of account receivable for the respective period. For the three months ended March 31, 2017 and 2018, the Company recorded the following transactions:
|  |  | Three months ended March 31, |
|  |  | 2017 |  |  | 2018 |
| Purchase of inventories from |  |  |  |  |  |
| BAK Tianjin | $ | - |  | $ | 480 |
| Shenzhen BAK |  | 2,362,444 |  |  | - |
| Zhengzhou BAK Battery Co., Ltd* |  | 12,457 |  |  | - |
| Sales of finished goods to |  |  |  |  |  |
| BAK Tianjin |  | 26,546 |  |  | 10,080 |
| Shenzhen BAK |  | 60,797 |  |  | - |
| Zhengzhou BAK Battery Co., Ltd* | $ | 13,648 |  | $ | - |
*Mr. Xiangqian Li, the former CEO, is a director of this company.
| (b) | Credit Risk
|  | Financial instruments that potentially subject the Company to a significant concentration of credit risk consist primarily of cash and cash equivalents and pledged deposits. As of December 31, 2017 and March 31, 2018, substantially all of the Company’s cash and cash equivalents were held by major financial institutions located in the PRC, which management believes are of high credit quality.
|  | For the credit risk related to trade accounts receivable, the Company performs ongoing credit evaluations of its customers and, if necessary, maintains reserves for potential credit losses. Historically, such losses have been within management’s expectations.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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