Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Expected income tax benefit at the federal statutory rate	21.00%	21.00%	34.00%
State taxes, net of federal benefit	(0.06%)	(0.01%)	0.04%
Foreign losses taxed at different rates	(0.01%)	(0.11%)	0.00%
Research and development credit, net	4.39%	2.79%	3.56%
Tax Cuts and Jobs Act revaluation	0.00%	0.00%	(57.00%)
Non-deductible items	(0.97%)	(0.53%)	(1.15%)
Stock-based compensation	12.00%	2.59%	1.90%
Other	0.03%	0.76%	(0.85%)
Release of valuation allowance due to acquisition	2.47%	0.00%	0.00%
Change in valuation allowance	(36.43%)	(26.57%)	19.86%
Total	2.42%	(0.08%)	0.36%

Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Acquisition, Percent

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Tax Cuts And Jobs Act Of 2017, Change In Tax Rate Reconciliation, Revaluation Of Deferred Tax Assets

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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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