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Income taxes - Schedule of Reconciliation of Federal Statutory Rate to Company's Effective Tax Rate (Details)	12 Months Ended
	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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