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Summary of Significant Accounting Policies - Narrative (Details) shares in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2020 USD ($) region Segment shares | Dec. 31, 2019 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency transaction gain (loss), realized |  |  | $ 300,000 | $ 100,000 | $ 400,000 | $ 12,000 |  |  |
Derivative instruments not designated as hedging instruments, gain (loss), net |  |  | (200,000) | (200,000) | (400,000) | (300,000) |  |  |
Bad debt expenses |  |  | 0 | 0 | 0 | 0 |  |  |
Inventory valuation reserves | $ 300,000 | $ 200,000 | $ 300,000 |  | $ 300,000 |  |  |  |
Money back guarantee period |  |  |  |  | 30 days |  |  |  |
Handling and restocking fee, percentage | 10.00% |  | 10.00% |  | 10.00% |  |  |  |
Return liability reserve | $ 200,000 | 300,000 | $ 200,000 |  | $ 200,000 |  |  |  |
Research and development |  |  | 200,000 | 300,000 | 400,000 | 500,000 |  |  |
Present value of lease liabilities | 17,458,000 |  | 17,458,000 |  | 17,458,000 |  |  |  |
Income tax expense |  |  | $ 1,761,000 | $ (846,000) | $ 2,660,000 | $ (158,000) |  |  |
Antidilutive securities excluded from EPS calculation (in shares) | shares |  |  | 45 | 100 | 100 | 200 |  |  |
Number of operating segments | Segment |  |  |  |  | 1 |  |  |  |
Number of geographic segments | region |  |  |  |  | 2 |  |  |  |
Beginning balance adjustment | 35,516,000 | 33,254,000 | $ 35,516,000 | $ 29,098,000 | $ 35,516,000 | $ 29,098,000 | $ 34,136,000 | $ 29,624,000 | $ 27,199,000
Revision of Prior Period, Accounting Standards Update, Adjustment |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance adjustment |  |  |  |  |  |  |  |  | $ 500,000
Sandy, UT |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Salvage value | 0 |  | 0 |  | 0 |  |  |  |
Abandonment expense |  |  |  |  | 800,000 |  |  |  |
Present value of lease liabilities | 200,000 |  | $ 200,000 |  | $ 200,000 |  |  |  |
Cash accounts held primarily at One Financial Institution |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Concentration of credit risk | 14,300,000 | 17,800,000 |  |  |  |  |  |  |
Cash held primarily at Other Financial Institutions |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Concentration of credit risk | $ 5,400,000 | $ 4,300,000 |  |  |  |  |  |  |

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