STOCK-BASED COMPENSATION (Details) |
1 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2016
employee
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
|
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | $ 7,832,000 | $ 7,403,000 | $ 9,787,000 | |
| Number of positions eliminated | employee | 46 | |||
| General and administrative | ||||
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | 4,230,000 | 3,303,000 | 5,113,000 | |
| Incremental stock-based compensation expense | 1,500,000 | |||
| Research and development | ||||
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | 3,103,000 | $ 4,100,000 | $ 4,674,000 | |
| Incremental stock-based compensation expense | 641,000 | |||
| Restructuring charge | ||||
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | 499,000 | |||
| Incremental stock-based compensation expense | $ 499,000 | |||
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. No definition available.
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- Definition The number of positions eliminated during the period as a result of restructuring activities. No definition available.
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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