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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 9 Months Ended
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Sep. 30, 2016
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Schedule of the calculation of basic and diluted net (loss) income per share |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
(In thousands, except share and per share data) |  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Net (loss) income |  | $ | (3,576 | ) | $ | 27,185 |  | $ | (21,055 | ) | $ | 8,514 |
Weighted-average shares: |  |  |  |  |  |  |  |  |
Basic |  | 159,140,254 |  | 158,151,747 |  | 159,011,741 |  | 157,922,075 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
Stock options and restricted stock awards |  | — |  | 4,517,934 |  | — |  | 4,526,818 |
Diluted |  | 159,140,254 |  | 162,669,681 |  | 159,011,741 |  | 162,448,893 |
Net (loss) income per share: |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.02 | ) | $ | 0.17 |  | $ | (0.13 | ) | $ | 0.05 |
Diluted |  | $ | (0.02 | ) | $ | 0.17 |  | $ | (0.13 | ) | $ | 0.05 |
Summary of allocation of stock-based compensation expense included in operating expenses on condensed statements of operations related to share-based payment awards |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
(In thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Research and development |  | $ | 352 |  | $ | 462 |  | $ | 1,038 |  | $ | 1,696 |
Restructuring charges |  | — |  | 5 |  | — |  | 307 |
General and administrative |  | 1,775 |  | 1,597 |  | 5,225 |  | 4,450 |
Stock-based compensation expense included in operating expenses |  | $ | 2,127 |  | $ | 2,064 |  | $ | 6,263 |  | $ | 6,453 |
Schedule of assumptions used to estimate the fair value of stock options granted |
|  | Nine Months Ended September 30, |
|  | 2016 |  | 2015 |
Dividend yield |  | 0% |  | 0% |
Expected volatility range |  | 0.888 to 0.890 |  | 0.874 to 0.884 |
Risk-free interest rate range |  | 1.21% to 1.38% |  | 1.68% to 1.71% |
Expected term |  | 5.5 yrs |  | 5.5 yrs |
Schedule of assumptions used to estimate the fair value of employee stock purchases under the purchase plan |
|  | Nine Months Ended September 30, |
|  | 2016 |  | 2015 |
Dividend yield |  | 0% |  | 0% |
Expected volatility range |  | 0.641 to 0.684 |  | 0.654 to 1.392 |
Risk-free interest rate range |  | 0.28% to 0.45% |  | 0.11% to 0.28% |
Expected term range |  | 6 – 12 mos |  | 6 – 12 mos |

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