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Income Taxes - Reconciliation of the statutory U.S. federal tax rate to effective rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of the statutory U.S. federal tax rate to effective rate
Statutory U.S. federal tax rate	21.00%	21.00%	34.00%
Tax Cuts and Jobs Act			33.90%
Tax (windfalls) deficiencies on exercise and vesting of equity awards	(17.10%)	(21.80%)	5.40%
Stock compensation expense	(9.80%)	(0.20%)	5.30%
State taxes, net of federal benefit	0.10%	(0.10%)	5.10%
Permanent items	1.20%	0.50%	4.40%
Provision to return adjustments	(1.10%)	(0.30%)	(9.50%)
Domestic production activities deduction			(7.20%)
Research and development credits	(0.80%)	(0.80%)	(7.20%)
Effective rate (as a percent)	(6.50%)	(1.70%)	64.20%

X

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable nondeductible expenses but not limited to meals and entertainment, Fines & penalties, Officers' life insurance.

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Percentage of effective income tax rate reconciliation provision to return adjustments.

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017.

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Percentage of tax deficiencies on exercise and vesting of equity awards .

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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