|
Description of Business (Details) (USD $)
|
0 Months Ended |
9 Months Ended |
0 Months Ended |
|
|
|
|
Mar. 14, 2014
|
Mar. 14, 2014
|
Mar. 31, 2015
|
Mar. 19, 2014
|
Mar. 19, 2014
|
Jun. 30, 2014
|
Mar. 17, 2014
|
Feb. 12, 2014
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
|
|
|
|
|
| Common stock, par value (usd per share) |
|
|
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
|
|
|
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
|
|
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
|
| Common stock, shares outstanding |
|
|
6,962,742us-gaap_CommonStockSharesOutstanding
|
|
|
6,962,742us-gaap_CommonStockSharesOutstanding
|
7,402,664us-gaap_CommonStockSharesOutstanding
|
|
| Cancellation of shares by Former Parent, shares |
71,922amrk_StockCanceledDuringPeriodShares
|
71,922amrk_StockCanceledDuringPeriodShares
|
|
|
|
|
|
|
| Common stock exchange ratio, numerator |
|
|
1amrk_EquityAwardExchangeRatioNumerator
|
|
|
|
|
|
| Common stock exchange ratio, denominator |
|
|
4.1717amrk_InverseEquityAwardExchangeRatioDenominator
|
|
|
|
|
|
| Awards assumed from SGI spin-off |
|
|
|
|
|
|
|
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
|
|
|
|
|
| Grants during the period (shares) |
|
|
|
249,846us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
|
|
| Awards assumed from SGI spin-off | Restricted Stock Units (RSUs) |
|
|
|
|
|
|
|
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
|
|
|
|
|
| Grants during the period (shares) |
|
|
|
130,646us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
130,646us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
|
| Awards assumed from SGI spin-off | Stock Appreciation Rights (SARs) |
|
|
|
|
|
|
|
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
|
|
|
|
|
| Grants during the period (shares) |
|
|
|
8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
|
| Former Parent SGI Plans |
|
|
|
|
|
|
|
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
|
|
|
|
|
| Secondment fee payable |
|
|
$ 150,000us-gaap_OtherCommitment
/ amrk_AnnualFeeDueforServiceCommitmentAxis
= amrk_FormerParentSGIPlansMember
|
|
|
|
|
|