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Related party transactions - Additional Information (Detail) |  |  |  | 1 Months Ended | 12 Months Ended |
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Jan. 01, 2017 EUR (€) | Nov. 17, 2015 | Jun. 08, 2011 EUR (€) | Jun. 30, 2016 | Apr. 30, 2015 | Feb. 28, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2014 CHF (SFr) | Aug. 31, 2012 USD ($) | Jun. 30, 2011 USD ($) | Jun. 30, 2009 USD ($) | Jun. 30, 2009 CAD | May 31, 2009 USD ($) | Feb. 28, 2009 USD ($) | Aug. 31, 2002 | Mar. 25, 2017 USD ($) | Mar. 25, 2017 EUR (€) | Mar. 26, 2016 USD ($) | Mar. 26, 2016 EUR (€) | Mar. 28, 2015 USD ($) | Mar. 28, 2015 EUR (€) | Mar. 29, 2014 USD ($) | Mar. 30, 2013 USD ($) | Feb. 28, 2015 CAD
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement additional renewal term |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal fees incurred |  |  |  |  |  | $ 60,000 |  |  |  |  |  |  |  |  |  | $ 57,000 |  | $ 38,000 |  | $ 447,000 |  |  |  | CAD 75,000
Percentage of purchase price on cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |  |  |  |
Purchase price of diamonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 503,000 |  | 189,000 |  |  |  |
Related party expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 178,000 |  | 201,000 |  | 241,000 |  |  |  |
Amount paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,000 |  |  |  | 136,000 |  |  |  |
Executive Chairman [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,000 |  |  |  |  |  |  |  |
Annual compensation | € | € 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Montrovest BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid to related party |  |  | € 140,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | € 0 | 116,000 | € 105,000 | 178,000 | € 140,000 |  |  |
Notice days for non renewal |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement additional renewal term |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Irrevocable letter of credit |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement expiration date |  | Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from related party |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  |  |  | 16.00% | 16.00% |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  |  |  | 12.20% |  |  |  |  |  | 17.80% |  |  |  |  |  |  |  |
Fee as a percentage of outstanding principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% | 7.00% |  |  |  |  |  |  |
Cash received from related party |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction amount |  |  |  |  |  |  |  |  |  | 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partial repayment of cash advance |  |  |  |  |  |  |  |  | $ 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advances payable to related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  | 1,500,000 |  |  |  |  |  |
Montrovest BV [Member] | Minimum [Member] | Potential Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from an equity issuance |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gestofi [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid to related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 154,000 | € 140,000 | 39,000 | € 35,000 |  |  |  |  |
Agreement additional renewal term |  |  |  |  |  |  | 1 year | 1 year |  |  | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 30, 2017 | Sep. 30, 2017 |  |  |  |  |  |  |
Agreement beginning date |  | Jan. 01, 2016 |  |  |  |  |  |  |  |  | Aug. 01, 2009 | Aug. 01, 2009 |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  | $ 12,500 | $ 13,310 | SFr 13,000 |  |  | $ 10,324 | CAD 13,700 |  |  |  |  |  |  |  |  |  |  |  |
Amount paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,666 |  |  |  |  |  |  |  |
Prime Investments S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of diamonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  | $ 200,000 |  | $ 0 |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |
Regaluxe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 178,000 |  | $ 201,000 |  |  |  | 241,000 |  |
Regaluxe [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 260,000 | $ 250,000 |

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