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STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 9,833 | $ 8,297 | $ 6,873
Unrecognized compensation cost | 11,784 |  |
Employee Stock |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | 73 | 155 | 129
Stock options |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | 593 | 632 | 789
Unrecognized compensation cost | $ 305 |  |
Weighted-Average Amortization Period (Years) | 6 months |  |
RSUs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 2,282 | 1,920 | 2,492
Unrecognized compensation cost | $ 1,487 |  |
Weighted-Average Amortization Period (Years) | 10 months 24 days |  |
RSAs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 4,497 | 3,492 | 2,850
Unrecognized compensation cost | $ 7,764 |  |
Weighted-Average Amortization Period (Years) | 2 years 4 months 24 days |  |
Performance-based RSAs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 242 | 1,293 | 613
Market-Based RSUs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | 291 | 112 | 0
Unrecognized compensation cost | $ 285 |  |
Weighted-Average Amortization Period (Years) | 10 months 24 days |  |
Market-Based RSAs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 1,855 | 693 | 0
Unrecognized compensation cost | $ 1,943 |  |
Weighted-Average Amortization Period (Years) | 1 year |  |
Research and development |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 697 | 632 | 1,036
General and administrative |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 9,136 | $ 7,665 | $ 5,837

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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