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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Amount of expense for employee benefit and equity-based compensation.

+ References

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Unrecognized cost of unvested share-based compensation awards.

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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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No definition available.

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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ 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	$ (874)	$ 2,472	$ 2,747	$ 7,406
Unrecognized compensation cost	1,916		1,916
Market based awards and service based awards \| Senior Management
Stock-based compensation
Stock based compensation reversed	1,900
RSUs
Stock-based compensation
Unrecognized compensation cost	1,044		1,044
RSAs
Stock-based compensation
Unrecognized compensation cost	872		872
Research and development
Stock-based compensation
Total stock-based compensation expense	0	180	0	533
General and administrative
Stock-based compensation
Total stock-based compensation expense	$ (874)	$ 2,292	$ 2,747	$ 6,873