v3.10.0.1

Income taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred tax assets: |  |  |  |  |
Net operating loss carryforwards |  | $ 34,545 | $ 23,838 |  |
Outside basis differences for U.S. partnerships |  | 9,558 | 14,306 |  |
Stock options |  | 2,396 | 4,100 |  |
Deferred revenue |  | 640 | 748 |  |
Deferred compensation |  | 120 | 249 |  |
State taxes |  | 80 | 78 |  |
Other |  | 1,525 | 1,282 |  |
Valuation allowance |  | (33,810) | (34,990) | $ (36,331) | $ (19,548)
Net deferred tax assets |  | 15,054 | 9,611 |  |
Deferred tax liabilities: |  |  |  |  |
Property and equipment |  | (7,318) | (6,983) |  |
Convertible Notes |  | (5,470) | 0 |  |
Intangible assets |  | (3,339) | (3,632) |  |
Net deferred tax liabilities |  | (16,127) | (10,615) |  |
Net deferred taxes |  | $ (1,073) | $ (1,004) |  |
Corporate federal tax rate | 21.00% | 21.00% | 34.00% | 34.00% |
Taxable income which can be offset by operating losses carryforward (as a percent) | 80.00% |  |  |  |
Executive compensation limit for covered employees | $ 1,000 |  |  |  |
Permitted bonus depreciation |  | 100.00% |  |  |
Maximum interest expense deductible, as percent to taxable income | 30.00% |  |  |  |
Income tax benefit resulting from reduction of corporate tax rate |  |  | $ 1,274 |  |
Income tax benefit from indefinite carryforward of NOLs expected to recover deferred tax liabilities |  |  | $ 1,766 |  |

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