Stock-Based Compensation - Options Valuation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stock-Based Compensation
Total stock-based compensation expense (in dollars)	$ 2,996	$ 939	$ 7,121	$ 7,776
Stock options
Stock-Based Compensation
Total stock-based compensation expense (in dollars)	$ 1,299	$ 871	$ 3,719	$ 2,440
Employee stock options
Valuation assumptions:
Expected volatility (as a percent)			58.40%	61.00%
Expected life			6 years 29 days	6 years 11 days
Risk-free interest rate (as a percent)			2.41%	2.21%
Weighted average grant-date fair value (in dollars per share)			$ 19.87	$ 8.13

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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