Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.20.1
Commitments and Contingencies - Additional Information (Details) - AMST - Goldline, LLC - USD ($)
$ in Thousands
1 Months Ended
Oct. 31, 2019
Jun. 30, 2019
Long-term Purchase Commitment [Line Items]    
Escrow deposit   $ 750,000
Decrease in escrow deposit $ 460,000