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Entity Level Information - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) Segment | Dec. 31, 2018 USD ($)
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Number of reporting segment | Segment | 1 |
Allowance for credit losses | $ 7 | $ 11
Receivables | Customer Concentration | Customer One |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 49.00% | 44.00%
Receivables | Customer Concentration | Customer Two |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 24.00% | 43.00%
Receivables | Customer Concentration | Customer Three |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 16.00% |
U.S [Member] |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Long-lived assets | $ 1,690 | $ 2,013
Asia Pacific [Member] |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Long-lived assets | $ 465 | $ 393

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