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Nature of Business - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) Customer IncentivePlan | Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Cash, uninsured amount |  |  |  | $ 71,600,000 |  |  |
Bonds payable, carrying amount |  |  |  | 24,600,000 |  |  |
Bonds payable, fair value |  |  |  | $ 24,600,000 |  |  |
Number of single customer comprising more than 10% of account receivable | Customer |  |  |  | 4 | 2 |  |
Allowance for doubtful accounts |  |  |  | $ 38,000 | $ 128,000 |  |
Asset impairments |  |  |  | 3,872,000 | 0 | $ 0 |
Impairment charges recognized on goodwill |  |  |  | $ 0 | 0 | 0 |
Period of assurance-based warranty for product defects |  |  |  | 90 days to five years |  |  |
Liability for warranty obligations |  |  |  | $ 8,394,000 | 8,623,000 | 9,724,000 | $ 8,548,000
Pension liability |  |  |  | $ 15,886,000 | 13,086,000 |  |
Number of stock incentive plans | IncentivePlan |  |  |  | 2 |  |  |
Stock-based compensation expense |  |  |  | $ 6,962,000 | 7,155,000 | 7,433,000 |
Total unrecognized compensation cost related to non-vested stock options, PSUs, RSUs and restricted stock |  |  |  | $ 17,200,000 |  |  |
Recognition period of unvested compensation expense |  |  |  | 3 years |  |  |
Research and development costs |  |  |  | $ 126,200,000 | 124,547,000 | $ 130,666,000 |
Operating lease, right-of-use asset | $ 10,322,000 |  |  | 8,452,000 |  |  |
Operating lease, right-of-use liability | 10,322,000 |  |  | 8,494,000 |  |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Current deferred costs related to prepaid and other assets |  |  |  | 1,600,000 | 2,400,000 |  |
Other Assets [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Non-current deferred costs related to other assets |  |  |  | $ 100,000 | $ 800,000 |  |
ASU 2018-02 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Reclassification of tax effects related to adoption ASU | $ 400,000 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Amortization, estimated useful lives |  |  |  | 2 years |  |  |
Lessor sales type lease arrangement terms for network equipments |  |  |  | 18 months |  |  |
Maintenance service periods |  |  |  | 1 month |  |  |
Maintenance contract period |  |  |  | 1 month |  |  |
Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Amortization, estimated useful lives |  |  |  | 14 years |  |  |
Lessor sales type lease arrangement terms for network equipments |  |  |  | 5 years |  |  |
Maintenance service periods |  |  |  | 5 years |  |  |
Maintenance contract period |  |  |  | 5 years |  |  |
Maximum [Member] | Accounting Policy under Topic 605 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Invoiced sales tax as percentage on total revenues. |  |  |  | 1.00% |  |  |
Building and Land Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 5 years |  |  |
Building and Land Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 39 years |  |  |
Office Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 3 years |  |  |
Office Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 7 years |  |  |
Engineering Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 3 years |  |  |
Engineering Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 7 years |  |  |
Computer Software [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 3 years |  |  |
Computer Software [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 5 years |  |  |
Credit Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Percentage of accounts receivable accounted by each customers |  |  |  | 53.20% | 36.90% |  |
Out-of-Period Adjustment [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Increase (decrease) in cost of goods sold |  | $ 800,000 | $ (200,000) |  |  |  |
Increase (decrease) in excess and obsolete inventory reserve |  | $ 800,000 | $ (200,000) |  |  |  |

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