STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock-based compensation
Total stock-based compensation expense	$ 3,233	$ 9,833	$ 8,297
Unrecognized compensation cost	1,443
ESPP
Stock-based compensation
Total stock-based compensation expense	46	73	155
Stock options
Stock-based compensation
Total stock-based compensation expense	305	593	632
RSUs
Stock-based compensation
Total stock-based compensation expense	1,650	2,282	1,920
Unrecognized compensation cost	$ 682
Weighted-Average Amortization Period (Years)	7 months 6 days
RSAs
Stock-based compensation
Total stock-based compensation expense	$ 1,920	4,497	3,492
Unrecognized compensation cost	$ 761
Weighted-Average Amortization Period (Years)	2 years 2 months 12 days
Performance-based RSAs
Stock-based compensation
Total stock-based compensation expense	$ 0	242	1,293
Market-based RSUs (PSUs)
Stock-based compensation
Total stock-based compensation expense	(224)	291	112
Market-based RSAs (PSAs)
Stock-based compensation
Total stock-based compensation expense	(464)	1,855	693
Market-based awards \| Senior Management
Stock-based compensation
Stock based compensation reversed	1,700
Research and development
Stock-based compensation
Total stock-based compensation expense	0	697	632
General and administrative
Stock-based compensation
Total stock-based compensation expense	$ 3,233	$ 9,136	$ 7,665

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.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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