Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Stock-Based Compensation
Allocated share-based compensation expense	$ 2,628	$ 2,765
Stock-Based Compensation
Unrecognized stock-based compensation cost, net of estimated forfeiture	12,000
Research and development
Stock-Based Compensation
Allocated share-based compensation expense	161	191
Selling, general and administrative expenses
Stock-Based Compensation
Allocated share-based compensation expense	$ 2,467	$ 2,574
Employee and Non Employee Stock Option
Stock-Based Compensation
Stock options and other incentive awards granted (in shares)	4,676	5,150

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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- Definition

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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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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- Definition

Net number of share options (or share units) granted during the period.

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