Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Escrow Balance Related to Purchase of Goldline) (Details)

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Commitments and Contingencies (Escrow Balance Related to Purchase of Goldline) (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
Decrease in escrow deposit $ 460