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v3.20.1

Business Segment, Geographic and Major Customer Information (Revenue by Geographic Location) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue by geographic location |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 19,526 | $ 21,879 | $ 34,692 | $ 43,256 | $ 43,449 | $ 53,709 | $ 39,546 | $ 41,069 | $ 119,353 | $ 177,773 | $ 243,106
U.S. |  |  |  |  |  |  |  |  |  |  |
Revenue by geographic location |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 104,786 | 146,421 | 219,517
Other countries |  |  |  |  |  |  |  |  |  |  |
Revenue by geographic location |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 14,567 | $ 31,352 | $ 23,589

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