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Balance Sheet Accounts (Narratives) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2015
Balance Sheet Accounts [Line Items] |  |  |  |  |
Inventories | $ 56,601,000 |  | $ 56,601,000 |  | $ 58,014,000
Amortization | 8,100,000 | $ 9,000,000 | 17,000,000 | $ 18,000,000 |
Letters for credit outstanding | 1,000,000 |  | $ 1,000,000 |  |
Standard hardware warranty period |  |  | 12 months |  |
Standard software warranty period |  |  | 90 days |  |
Limited lifetime hardware warranty maximum period after end of sale of product |  |  | 5 years |  |
Revolving Facility |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |
Term of agreement |  |  |  |  | 5 years
Borrowing capacity |  |  |  |  | $ 50,000,000
Remaining borrowing capacity | 32,200,000 |  | $ 32,200,000 |  |
Term Loan |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |
Term of agreement |  |  |  |  | 5 years
Borrowing capacity |  |  |  |  | $ 65,000,000
Cost Of Product Revenue |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |
Amortization | $ 3,800,000 | $ 4,500,000 | $ 8,300,000 | $ 9,100,000 |
Maximum |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |
Extended warranty period |  |  | 5 years |  |
Minimum |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |
Extended warranty period |  |  | 1 year |  |
Minimum | Net Revenue | Customer Concentration Risk |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |
Concentration risk |  |  | 10.00% |  |
Cash equivalents | Maximum |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |
Maturity period for investments |  |  | 3 months |  |
Short-term investments | Maximum |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |
Maturity period for investments |  |  | 1 year |  |
Short-term investments | Minimum |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |
Maturity period for investments |  |  | 3 months |  |
Marketable securities | Minimum |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |
Maturity period for investments |  |  | 1 year |  |

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