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Segment Disclosure - Financial Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Financial information by segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 171,163 | $ 174,556 | $ 177,677 | $ 153,735 | $ 160,777 | $ 147,894 | $ 124,435 | $ 159,465 | $ 178,991 | $ 192,192 | $ 200,616 | $ 176,787 | $ 677,131 | $ 592,571 | $ 748,586
Gross profit | 49,594 | 52,216 | 55,336 | 40,001 | 49,345 | 47,384 | 41,158 | 40,644 | 50,583 | 57,769 | 60,071 | 48,874 | 197,147 | 178,531 | 217,297
Income (loss) from operations | 2,306 | $ 9,236 | $ 11,374 | $ (4,746) | 4,652 | $ 5,742 | $ (383) | $ (111,228) | $ 2,335 | $ 10,779 | $ 15,419 | $ (4,396) | 18,170 | (101,217) | 24,137
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 34,921 | 35,705 | 38,533
Intangible assets, net | 59,381 |  |  |  | 68,642 |  |  |  |  |  |  |  | 59,381 | 68,642 |
Total assets | 562,195 |  |  |  | 583,313 |  |  |  |  |  |  |  | 562,195 | 583,313 |
Operating segments | Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information by segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 555,387 | 476,164 | 595,130
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 155,384 | 141,084 | 165,513
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 48,458 | (44,222) | 49,593
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 25,259 | 26,093 | 28,854
Intangible assets, net | 51,862 |  |  |  | 58,917 |  |  |  |  |  |  |  | 51,862 | 58,917 |
Total assets | 424,058 |  |  |  | 427,636 |  |  |  |  |  |  |  | 424,058 | 427,636 |
Operating segments | International |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information by segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 117,245 | 107,556 | 144,271
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 34,282 | 31,046 | 43,145
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 1,839 | (21,855) | 5,856
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 8,791 | 8,659 | 8,285
Intangible assets, net | 6,344 |  |  |  | 8,664 |  |  |  |  |  |  |  | 6,344 | 8,664 |
Total assets | 111,619 |  |  |  | 129,228 |  |  |  |  |  |  |  | 111,619 | 129,228 |
Operating segments | Products and Systems |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information by segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 13,831 | 16,449 | 18,583
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 7,001 | 6,826 | 8,639
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | (117) | (936) | (529)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 928 | 998 | 1,213
Intangible assets, net | 1,042 |  |  |  | 1,012 |  |  |  |  |  |  |  | 1,042 | 1,012 |
Total assets | 10,532 |  |  |  | 10,996 |  |  |  |  |  |  |  | 10,532 | 10,996 |
Corporate and eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information by segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | (9,332) | (7,598) | (9,398)
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 480 | (425) | 0
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | (32,010) | (34,204) | (30,783)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | (57) | (45) | $ 181
Intangible assets, net | 133 |  |  |  | 49 |  |  |  |  |  |  |  | 133 | 49 |
Total assets | $ 15,986 |  |  |  | $ 15,453 |  |  |  |  |  |  |  | $ 15,986 | $ 15,453 |

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