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Balance Sheet Components - Additional Information (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Customer | Jun. 30, 2017 USD ($) Customer | Dec. 31, 2017 USD ($) Customer
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Unbilled Receivables | $ 1,251,000 |  | $ 1,251,000 |  | $ 1,470,000
Accounts receivable, net | $ 37,472,000 |  | $ 37,472,000 |  | 31,444,000
Percentage of Non-US revenue invoiced in Euros | 76.00% | 75.40% | 76.40% | 73.90% |
Noncurrent inventories expected to be realized or consumed | $ 312,000 |  | $ 312,000 |  | 644,000
Salvage value of expenditures for additions, improvements and replacements | 0 |  | 0 |  |
Repairs and maintenance expense | 630,000 | $ 694,000 | 1,190,000 | $ 1,345,000 |
Depreciation and amortization | 2,517,000 | 2,992,000 | 5,212,000 | 6,169,000 |
Impairments of long-lived assets | 0 | 0 | 0 | 0 |
Impairment of finite lived intangible assets | 0 | 0 | 0 | 0 |
Amortization of intangible assets | 299,000 | 125,000 | 597,000 | 152,000 |
Construction in Process and Computer Software or Development Cost |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Depreciation and amortization | 0 | $ 0 | 0 | $ 0 |
Customer Concentration Risk | Customer One |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Accounts receivable, net | 10,763,000 |  | 10,763,000 |  | 10,394,000
Customer Concentration Risk | Customer Two |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Accounts receivable, net | $ 6,484,000 |  | $ 6,484,000 |  | $ 6,459,000
Sales Revenue, Net | Customer Concentration Risk |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Number of customers | Customer |  |  | 1 | 1 |
Net Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Number of customers | Customer |  |  | 2 |  | 2
Raw materials | Supplier Concentration Risk | Vendor one |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 20.20% | 18.60% |
Raw materials | Supplier Concentration Risk | Vendor two |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 13.80% | 14.60% |
Raw materials | Supplier Concentration Risk | Vendor three |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 9.30% | 9.80% |

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