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STOCK BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2017
STOCK BASED COMPENSATION |
Schedule of stock-based compensation expense |
|  | Year Ended December 31, |
(In thousands) |  | 2017 |  | 2016 |  | 2015 |
Research and development |  | $ | 697 |  | $ | 632 |  | $ | 1,036 |
General and administrative |  |  | 9,136 |  |  | 7,665 |  |  | 5,837 |
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Total stock-based compensation expense |  | $ | 9,833 |  | $ | 8,297 |  | $ | 6,873 |
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Schedule of stock-based compensation expense included in the consolidated statements of operations by award type |
|  | Year Ended December 31, |
(In thousands) |  | 2017 |  | 2016 |  | 2015 |
Stock options |  | $ | 593 |  | $ | 632 |  | $ | 789 |
RSUs |  |  | 2,282 |  |  | 1,920 |  |  | 2,492 |
RSAs |  |  | 4,497 |  |  | 3,492 |  |  | 2,850 |
Performance-based RSAs |  |  | 242 |  |  | 1,293 |  |  | 613 |
Market-based RSUs |  |  | 291 |  |  | 112 |  |  | — |
Market-based RSAs |  |  | 1,855 |  |  | 693 |  |  | — |
ESPP |  |  | 73 |  |  | 155 |  |  | 129 |
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Total stock-based compensation expense |  | $ | 9,833 |  | $ | 8,297 |  | $ | 6,873 |
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Schedule of unrecognized stock-based compensation cost and the estimated weighted-average amortization period | As of December 31, 2017, the unrecognized stock-based compensation cost and the estimated weighted-average amortization period were as follows:
(In thousands) |  | Unrecognized Compensation Cost |  | Weighted-Average Amortization Period (Years) |
Stock options |  | $ | 305 |  |  | 0.5 |
RSUs |  |  | 1,487 |  |  | 0.9 |
RSAs |  |  | 7,764 |  |  | 2.4 |
Market-based RSUs |  |  | 285 |  |  | 0.9 |
Market-based RSAs |  |  | 1,943 |  |  | 1.0 |
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Total unrecognized compensation cost |  | $ | 11,784 |  |  |  |
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Summary of equity award activity under the 2012 plan and prior plans |
(In thousands, except per share data) |  | Number of outstanding options |  | Weighted- Average Exercise Price of Outstanding Options |  | Number of outstanding RSUs and PSUs |  | Weighted- Average Fair Value per Share at Grant |  | Number of outstanding RSAs and PSAs |  | Weighted- Average Fair Value per Share at Grant |
Balance as of December 31, 2016 |  |  | 2,900 |  | $ | 23.72 |  |  | 413 |  | $ | 15.29 |  |  | 1,125 |  | $ | 13.67 |
Granted |  |  | — |  |  | — |  |  | 255 |  |  | 11.38 |  |  | 774 |  |  | 9.53 |
Exercised |  |  | (16 | ) |  | 11.81 |  |  | — |  |  | — |  |  | — |  |  | — |
Released RSUs/RSAs |  |  | — |  |  | — |  |  | (278 | ) |  | 15.88 |  |  | (412 | ) |  | 14.87 |
Forfeited |  |  | (1,244 | ) |  | 23.63 |  |  | (20 | ) |  | 12.62 |  |  | (39 | ) |  | 13.19 |
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Balance as of December 31, 2017 |  |  | 1,640 |  |  | 23.90 |  |  | 370 |  |  | 11.57 |  |  | 1,448 |  |  | 9.95 |
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Schedule of weighted-average assumptions used to estimate the fair value of stock options granted and employee stock purchase plan issuances |
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Employee stock purchase plan issuances |  |  |  |  |  |
Risk-free interest rate |  | 1.4% - 1.7% |  | 0.4% - 1.0% |  | 0.1% - 0.9%
Expected term (in years) |  | 0.5 - 2 |  | 0.5 - 2 |  | 0.5 - 2
Volatility |  | 35% - 44% |  | 39% - 66% |  | 44% - 69%
Dividend yield |  | 0% |  | 0% |  | 0% - 6%
Weighted-average estimated fair value of ESPP shares granted |  | $3.90 |  | $4.47 |  | $4.52

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options and employee stock purchase plan issuances, including, but not limited to: (a) expected term of share options and other 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 No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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