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Income taxes - Significant components of deferred taxes (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred tax assets: |  |  |
Deferred tax asset attributable to carryforward losses | $ 59,468 | $ 40,236 |
Intangible assets | 1,621 | 1,986 |
Property, plant and equipment | 1,412 | 1,202 |
Deferred revenue | 19,997 | 21,410 |
Accrued revenue |  | 962 |
Accrued expenses and other current liabilities | 144 | 935 |
Gross deferred tax asset | 82,642 | 66,731 |
Less valuation allowance | (82,642) | (65,593) |
Net deferred tax asset |  | 1,138 |
Deferred tax liabilities: |  |  |
Long-term loan to foreign operation |  | (1,138) |
Net deferred tax liability |  | (1,138) |
Valuation Allowance [Abstract] |  |  |
Net change in total valuation allowance | $ 17,000 | 15,600 |
Tax loss carry-forwards |  |  |
Tax loss carry-forward expiration (in years) | 9 years |  |
Tax loss carry-forwards | $ 182,000 | 137,000 | $ 175,700
Unrecognized Tax Benefits | 0 | 0 | $ 0
2015 |  |  |
Tax loss carry-forwards |  |  |
Tax loss carry-forwards expiring during the year |  | $ 0 |
2016 |  |  |
Tax loss carry-forwards |  |  |
Tax loss carry-forwards expiring during the year | 0 |  |
2017 |  |  |
Tax loss carry-forwards |  |  |
Tax loss carry-forwards expiring during the year | 21,523 |  |
2018 |  |  |
Tax loss carry-forwards |  |  |
Tax loss carry-forwards expiring during the year | 17,579 |  |
2019 |  |  |
Tax loss carry-forwards |  |  |
Tax loss carry-forwards expiring during the year | 19,070 |  |
2020 |  |  |
Tax loss carry-forwards |  |  |
Tax loss carry-forwards expiring during the year | 17,333 |  |
2021 |  |  |
Tax loss carry-forwards |  |  |
Tax loss carry-forwards expiring during the year | $ 13,043 |  |

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