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SHARE-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Compensation Expenses Related to Share Based Compensation | The compensation expense related to the Company’s share-based compensation arrangements has been included in the Condensed Consolidated Statements of Comprehensive Loss as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
General and administrative |  | $ | 7,572 |  |  | $ | 6,250 |  |  | $ | 14,828 |  |  | $ | 11,703 |
Research and development |  |  | 4,279 |  |  |  | 3,640 |  |  |  | 16,902 |  |  |  | 7,163 |
Total share-based compensation expense |  | $ | 11,851 |  |  | $ | 9,890 |  |  | $ | 31,730 |  |  | $ | 18,866 |
Weighted-Average Assumptions for Stock Option Grants using Black-Scholes Option-Pricing Model | The estimated fair value of each stock option granted was determined on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions for the stock option grants:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Risk-free interest rate |  | 2.8% |  |  | 1.9% |  |  | 2.5% |  |  | 2.0% |
Expected volatility of common stock |  | 57.7% |  |  | 58.5% |  |  | 60.1% |  |  | 58.1% |
Dividend yield |  | 0.0% |  |  | 0.0% |  |  | 0.0% |  |  | 0.0% |
Expected option term |  | 5.4 years |  |  | 5.6 years |  |  | 4.8 years |  |  | 5.7 years |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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