Stock-Based Compensation - Other Option Information and Assumptions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-based compensation additional disclosures
Weighted average expected volatility	54.90%	55.20%	59.20%
Weighted average expected term	7 years 2 months 12 days	7 years 4 months 24 days	7 years 3 months 18 days
Weighted average risk-free interest rate	2.30%	2.78%	2.08%
Expected dividends	0.00%	0.00%	0.00%
Stock Options
Stock-based compensation additional disclosures
Aggregate intrinsic value of options exercised during the year	$ 19,062	$ 49,188	$ 7,562
Cash received from the exercise of stock options	$ 4,519	$ 9,855	$ 4,714
Weighted average grant date fair value per option	$ 36.52	$ 25.96	$ 18.05

Amount of cash inflow from exercise of option under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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