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Segment Information and Foreign Operations - Concentration of Credit Risk (Details) - customer | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Revenues |  |
Revenue, Major Customer [Line Items] |  |
Number of customers representing significant share | 2 | 2
Accounts Receivable |  |
Revenue, Major Customer [Line Items] |  |
Number of customers representing significant share | 3 | 3
Landmark | Revenues |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers | 11.00% | 12.00%
Haisi Optoelectronics | Revenues |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers | 12.00% |
Osram Opto [Member] | Revenues |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers |  | 12.00%
Major Customer One | Accounts Receivable |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers | 14.00% | 17.00%
Major Customer Two | Accounts Receivable |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers | 14.00% | 12.00%
Major Customer Three | Accounts Receivable |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers | 12.00% | 10.00%
Top Five Major Customers | Revenues |  |
Revenue, Major Customer [Line Items] |  |
Number of customers representing significant share | 5 | 5
Percentage share generated by major customers | 40.00% | 38.00%

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