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Business Segments, Concentration of Credit Risk and Significant Customers - Significant Customers (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) customer | Dec. 31, 2015 USD ($) customer | Dec. 31, 2014
Significant Customers |  |  |
Property and equipment, net | $ 1,274 | $ 1,630 |
Total revenues | Customer concentration risk | Customer A |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 47.00% | 34.00% |
Total revenues | Customer concentration risk | Customer B |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 21.00% | 12.00% | 31.00%
Total revenues | Customer concentration risk | Customer C |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 13.00% | 31.00% | 34.00%
Total revenues | Customer concentration risk | Customer D |  |  |
Significant Customers |  |  |
Percentage of concentration risk |  |  | 11.00%
Net accounts receivable | Credit concentration | Three customers |  |  |
Significant Customers |  |  |
Percentage of concentration risk |  | 94.00% |
Number of customers | customer |  | 3 |
Net accounts receivable | Credit concentration | One customer |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 72.00% |  |
Number of customers | customer | 1 |  |
United States |  |  |
Significant Customers |  |  |
Property and equipment, net | $ 1,274 | $ 1,578 |
Non-U.S. |  |  |
Significant Customers |  |  |
Property and equipment, net |  | $ 52 |

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