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Warrants (Details 1) - Fair Value, Inputs, Level 3 [Member] - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance at the beginning of the year
Warrants issued to institution investors 17,980,000
Warrants issued to placement agent 1,875,000
Warrants redeemed
Fair value change of the issued warrants included in earnings (2,072,000)
Balance at end of year $ 17,783,000