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Property and Equipment - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2018 | Jul. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 03, 2018 | Jun. 21, 2017 | Jan. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  | $ 200 | $ 500 | $ 506 | $ 951 | $ 1,650 | $ 2,238 | $ 1,286 |  |  |
Property and equipment, net |  |  |  | $ 403 |  | 403 |  | 3,113 | 5,572 |  |  |  |
Fixed asset impairment |  |  | $ 300 |  |  |  |  | 0 | 147 | $ 0 |  |  |
Fixed assets held-for-sale | $ 300 |  |  |  |  |  |  | 300 |  |  |  |  | $ 500
Carrying value of assets sold |  | $ 200 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property held-for-sale | $ 200 | 300 |  |  |  |  |  |  |  |  |  |  |
Gain sale of assets held for sale |  | $ 100 |  |  |  | $ 34 | $ 0 | 100 |  |  |  |  |
Decrease in number of employees (percent) |  |  |  | 50.00% |  | 50.00% |  |  |  |  |  | 50.00% |
Asset impairment charges |  |  |  |  |  |  |  | 200 |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in number of employees (percent) |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  |  |  | 2,300 |  |  |  |  |
International |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  |  |  | $ 800 |  |  |  |  |
2016 Restructuring Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed asset impairment |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |

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