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Restructuring (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 | Mar. 31, 2016 USD ($) position | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Total termination charges | $ 800,000 |  |  |  | $ 800,000 |
Severance benefits and other one-time termination costs | 660,000 |  |  |  | 660,000 |
Cash expenditures |  |  |  | $ 820,000 |  |
Reduction in workforce, as a percent |  |  | 60.00% |  |  |
Restructuring expense |  | $ 50,000 |  |  | 1,000,000 |
Termination fee | 270,000 |  |  |  |  |
Restructuring charges |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 5,000 |
Restructuring charge |  |  |  |  | 1,321,000 | $ 676,000
Cash payments |  |  |  |  | (848,000) |
Balance at the end of the period | 478,000 |  |  |  | 478,000 | 5,000
Hyderabad India |  |  |  |  |  |
Number of positions/employees terminated | position |  |  |  | 18 |  |
United States |  |  |  |  |  |
Number of positions/employees terminated | position |  |  |  | 12 |  |
Workforce reduction |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |
Restructuring charge |  |  |  |  | 458,000 |
Cash payments |  |  |  |  | (458,000) |
Facility related |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |
Restructuring charge |  |  |  |  | 269,000 |
Cash payments |  |  |  |  | (180,000) |
Balance at the end of the period | 89,000 |  |  |  | 89,000 |
Contractual obligations and other termination costs |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 5,000 |
Restructuring charge |  |  |  |  | 594,000 |
Cash payments |  |  |  |  | (210,000) |
Balance at the end of the period | $ 389,000 |  |  |  | $ 389,000 | $ 5,000

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