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Income taxes - Schedule of Reconciliation of Federal Statutory Rate to Company's Effective Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 35.00% | 35.00%
Federal tax deferred rate change | 0.00% | (53.80%) | 0.00%
State tax, net of federal benefit | 2.60% | 0.60% | 0.70%
State tax deferred rate change, net of federal benefit | 0.90% | 0.90% | 18.70%
Nondeductible business expenses | 1.40% | 0.00% | 2.00%
Provision-to-return adjustment | (3.90%) | 0.00% | 0.00%
Uncertain tax positions | (1.30%) | (1.70%) | 2.00%
Stock based compensation | (8.60%) | (28.10%) | (16.80%)
Others | 1.40% | (1.90%) | 4.30%
Effective tax rate | 13.50% | (49.00%) | 45.90%

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