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Income taxes, Net deferred tax asset (liability) and tax credit carryforwards (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Net deferred tax asset (liability) [Abstract] |  |
Federal losses carryforward | $ 1,603 | $ 4,130
State losses carryforward | 17,234 | 13,682
Research and development carryforward | 3,534 | 3,647
Scientific research and experimental development credit carryforward | 16,493 | 16,594
Stock compensation | 5,344 | 8,389
Foreign deferrals | 34,072 | 58,647
Inventory reserves | 1,607 | 2,273
Other | 3,889 | 5,569
Deferred tax asset | 83,776 | 112,931
Fixed assets | (23,121) | (30,728)
Intangible assets | (2,229) | (5,882)
Other | (10,451) | (16,047)
Deferred tax liability | (35,801) | (52,657)
Valuation allowance | (45,141) | (54,178)
Net deferred tax (liabilities)/ asset | 2,834 | 6,096
Operating Loss Carryforwards [Line Items] |  |
Deferred tax assets, valuation allowance | 45,141 | 54,178
Research and Development Tax Credit [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | $ 3,500 |
Tax credit carryforwards, expiration date | Dec. 31, 2024 |
Manitoba Scientific Research And Experimental Development [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | $ 16,500 |
Tax credit carryforwards, expiration date | Dec. 31, 2025 |
U.S. Federal Tax Authority [Member] |  |
Net deferred tax asset (liability) [Abstract] |  |
Valuation allowance | $ 0 |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax liabilities, net | (13,100) | (18,300)
Net operating loss carryforwards | $ 7,600 |
Operating loss carryforwards, expiration year | Dec. 31, 2027 |
Deferred tax assets, valuation allowance | $ 0 |
State and Local Jurisdiction [Member] |  |
Net deferred tax asset (liability) [Abstract] |  |
Valuation allowance | (193,500) |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards | 264,100 |
Deferred tax assets, valuation allowance | 193,500 |
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax assets, net | 15,900 | $ 24,400
Net operating loss carryforwards | $ 168,700 |
Period of change in the nature or conduct of business following change in ownership | 3 years |
U.S. Federal Tax Authority - Tax Effected [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards | $ 1,600 |
State and Local Jurisdiction - Tax Effected [Member] |  |
Net deferred tax asset (liability) [Abstract] |  |
Valuation allowance | (12,600) |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards | 17,200 |
Deferred tax assets, valuation allowance | 12,600 |
Canadian Federal Gross [Member] |  |
Net deferred tax asset (liability) [Abstract] |  |
Valuation allowance | (41,800) |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax assets, valuation allowance | 41,800 |
Canadian Federal Tax Effected [Member] |  |
Net deferred tax asset (liability) [Abstract] |  |
Valuation allowance | (11,300) |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax assets, valuation allowance | 11,300 |
Foreign Tax Authority Tax Effected Excluding Canada [Member] |  |
Net deferred tax asset (liability) [Abstract] |  |
Valuation allowance | (32,500) |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax assets, valuation allowance | 32,500 |
Foreign Tax Authority Tax Effected [Member] |  |
Net deferred tax asset (liability) [Abstract] |  |
Valuation allowance | (32,500) |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax assets, valuation allowance | $ 32,500 |

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