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The Company and Summary of Significant Accounting Policies - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2017 $ / shares | Dec. 31, 2018 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) Gigabit / s $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) | Oct. 04, 2018 $ / shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Speed per second of high-speed interface technology of Bandwidth Engine ICs (in giga per second) | Gigabit / s |  |  |  |  | 10 |  |  |
Reverse stock split | 10 |  |  |  |  |  |  |
Common stock, par or stated value per share | $ / shares | $ 0.001 | $ 0.001 |  |  | $ 0.001 | $ 0.001 |  | $ 0.001
Maximum specific allowance as percentage of invoice value for problematic customer balances |  | 100.00% |  |  | 100.00% |  |  |
Allowance for doubtful accounts receivable |  | $ 0 |  |  | $ 0 | $ 0 |  |
Inventory reserves |  |  |  |  | 100,000 | 300,000 | $ 0 |
Impairment of goodwill |  | 9,700,000 | $ 3,200,000 | $ 9,900,000 | 12,856,000 |  | $ 9,858,000 |
Accumulated deficit |  | $ (235,867,000) |  |  | $ (235,867,000) | (224,688,000) |  |
Period payments due from customers |  |  |  |  | 60 days |  |  |
Revenue, practical expedient, financing component |  |  |  |  | true |  |  |
Payment terms |  |  |  |  | The Company sells its products both directly to customers and through distributors generally under agreements with payment terms typically 60 days or less |  |  |
Deferred revenue, revenue recognized |  |  |  |  | $ 3,900,000 |  |  |
Remaining term of the lease at the time of adoption |  | 22 months |  |  | 22 months |  |  |
Adjustments Due to ASC 606 | ASU 2014-09 |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Accumulated deficit |  | $ (220,000) |  |  | $ (220,000) | $ 230,000 |  |
Minimum |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  |  |  |  | 3 years |  |  |
Estimated useful lives of long-lived assets |  |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  |  |  |  | 5 years |  |  |
Estimated useful lives of long-lived assets |  |  |  |  | 7 years |  |  |

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