STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-based compensation
Total stock-based compensation expense	$ 2,056	$ 3,233	$ 9,833
Unrecognized compensation cost	1,318
ESPP
Stock-based compensation
Total stock-based compensation expense	10	46	73
Stock options
Stock-based compensation
Total stock-based compensation expense	0	305	593
RSUs
Stock-based compensation
Total stock-based compensation expense	1,431	1,650	2,282
Unrecognized compensation cost	$ 376
Weighted-Average Amortization Period (Years)	3 months 18 days
RSAs
Stock-based compensation
Total stock-based compensation expense	$ 615	1,920	4,497
Unrecognized compensation cost	$ 942
Weighted-Average Amortization Period (Years)	2 years 6 months
Performance-based RSAs
Stock-based compensation
Total stock-based compensation expense	$ 0	0	242
Market-based RSUs (PSUs)
Stock-based compensation
Total stock-based compensation expense	0	(224)	291
Market-based RSAs (PSAs)
Stock-based compensation
Total stock-based compensation expense	0	(464)	1,855
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	0	697
General and administrative
Stock-based compensation
Total stock-based compensation expense	$ 2,056	$ 3,233	$ 9,136

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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