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Restructuring Activities - Charges (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 23, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Total Revenues |  |  | $ 8,948 |  | $ 11,847 |  | $ 19,103 | $ 24,638 |
Net loss |  |  | (945) | $ (1,289) | (1,753) | $ (216) | (2,234) | (1,969) |
Total assets |  |  | 43,981 |  |  |  | 43,981 |  | $ 51,719
Liabilities |  |  | (11,863) |  |  |  | (11,863) |  | $ (17,667)
Payments for restructuring |  |  | 248 |  | 94 |  | 535 | 203 |
Restructuring charge |  |  | 30 |  | 0 |  | 625 | 0 |
CHINA |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Total Revenues |  |  | (28) |  | 681 |  | 310 | 1,340 |
Net loss |  |  | (540) |  | (620) |  | (1,390) | (1,153) |
Total assets |  |  | 5,493 |  | 8,546 |  | 5,493 | 8,546 |
Liabilities |  |  | (1,199) |  | (2,953) |  | (1,199) | (2,953) |
Net Assets |  |  | 4,294 |  | $ 5,593 |  | 4,294 | $ 5,593 |
CHINA | Employee Severance |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring, expected cost |  |  | 562 |  |  |  | 562 |  |
Payments for restructuring |  |  | $ 278 |  |  |  | 535 |  |
Restructuring charge |  |  |  |  |  |  | 562 |  |
CHINA | Facility Closing |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charge | $ 63 |  |  |  |  |  | $ 63 |  |
Scenario, Forecast | CHINA | Employee Severance |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Payments for restructuring |  | $ 90 |  |  |  |  |  |  |

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