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Employee Benefit Plans (Narratives) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 Quarter $ / shares | Mar. 31, 2019 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Jun. 30, 2019 Quarter $ / shares shares | Jun. 30, 2018 Quarter $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Shares outstanding for options and awards | 3,014,000 |  |  | 3,014,000 |  | 2,719,000 |
Share-based compensation expense | $ | $ 0 |  | $ 0 | $ 0 | $ 0 |  |
Weighted-average grant-date fair value of options granted (in dollars per share) | $ / shares |  |  |  | $ 6.70 |  |  |
Awards granted |  |  |  | 6,299,000 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting percentage |  |  |  | The RSUs granted during the nine months ended March 31, 2020 vest from the original grant date as to one-third (1/3) on the one-year anniversary and one-twelfth (1/12) each quarter thereafter, subject to continued service to the Company. |  |  |
Performance Shares |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance stock unit vesting, consecutive quarters | Quarter |  | 2 |  |  |  | 2 | 2
Performance stock unit vesting, earnings per share threshold one | $ / shares |  |  |  |  |  | $ 0.20 | $ 0.20
Performance stock unit vesting, earnings per share threshold two | $ / shares |  | $ 0.09 |  |  |  |  |
Performance Shares | Minimum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance stock unit vesting, earnings per share | $ / shares |  |  |  |  |  | $ 0.20 |
Executive Officers and Directors | Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Awards granted |  |  |  | 566,038 |  |  |
Executive Officers And Other Vice President Level Employee | Performance Shares |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Awards granted |  |  |  |  |  | 600,000 | 600,000
Aerohive 2014 Equity Incentive Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Shares outstanding for options and awards | 736,796 |  |  | 736,796 |  |  |
2014 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) | $ / shares | $ 1.76 |  | $ 2.69 | $ 1.90 | $ 2.71 |  |
Shares issued under stock purchase plan | 1,498,155 |  | 1,499,042 | 2,721,699 | 2,779,750 |  |

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