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Stock-Based Awards (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Assumptions used to Determine Fair Value of Stock Options Granted |  | The assumptions that the Company used to determine the fair value of the stock options granted to employees and directors are as follows, presented on a weighted average basis (the Company did not grant any stock options to employees or directors during the year ended December 31, 2012):
|  | Year Ended December 31, |
|  | 2011 |  |  | 2013 |
Risk-free interest rate |  |  | 1.41 | % |  |  | 1.12 | %
Expected term (in years) |  |  | 6.25 |  |  |  | 6.25 |
Expected volatility |  |  | 78 | % |  |  | 85 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Summary of Stock Option Activity |  | The following table summarizes the Company’s stock option activity since January 1, 2011:
|  | Shares Issuable Under Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
|  |  |  |  |  |  |  | (In years) |  |  |  |
Outstanding as of January 1, 2011 |  |  | 440,301 |  |  | $ | 0.75 |  |  |  | 8.5 |  |  | $ | 216 |
Granted |  |  | 475,793 |  |  |  | 1.57 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2011 |  |  | 916,094 |  |  | $ | 1.19 |  |  |  | 8.7 |  |  | $ | 354 |
Granted |  |  | 7,961 |  |  |  | 1.57 |  |  |  |  |  |  |  |  |
Exercised |  |  | (16,069 | ) |  |  | 0.88 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (316,559 | ) |  |  | 1.57 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2012 |  |  | 591,427 |  |  | $ | 1.00 |  |  |  | 7.1 |  |  | $ | 342 |
Granted |  |  | 718,903 |  |  |  | 2.64 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2013 |  |  | 1,310,330 |  |  | $ | 1.88 |  |  |  | 7.8 |  |  | $ | 10,185 |
Options vested and expected to vest as of December 31, 2013 |  |  | 1,310,330 |  |  | $ | 1.88 |  |  |  | 7.8 |  |  | $ | 10,185 |
Options exercisable as of December 31, 2013 |  |  | 657,317 |  |  | $ | 1.26 |  |  |  | 6.6 |  |  | $ | 5,543 |
Summary of Restricted Stock Activity |  | The table below summarizes the Company’s restricted stock activity since January 1, 2011:
|  | Shares |  |  | Weighted Average Grant- Date Fair Value |
Unvested restricted common stock as of January 1, 2011 |  |  | 38,481 |  |  | $ | 0.82 |
Issued |  |  | — |  |  |  | — |
Vested |  |  | (13,933 | ) |  |  | 0.75 |
Forfeited |  |  | — |  |  |  | — |
Unvested restricted common stock as of December 31, 2011 |  |  | 24,548 |  |  | $ | 0.82 |
Issued |  |  | — |  |  |  | — |
Vested |  |  | (13,933 | ) |  |  | 0.75 |
Forfeited |  |  | — |  |  |  | — |
Unvested restricted common stock as of December 31, 2012 |  |  | 10,615 |  |  | $ | 0.82 |
Issued |  |  | — |  |  |  | — |
Vested |  |  | (3,980 | ) |  |  | 0.75 |
Forfeited |  |  | (6,635 | ) |  |  | 0.82 |
Unvested restricted common stock as of December 31, 2013 |  |  | — |  |  |  | — |
Summary of Stock-Based Compensation Expense Related to Stock Options and Restricted Common Stock | The Company recorded stock-based compensation expense related to stock options and restricted common stock in the following expense categories of its statements of operations:
|  | Nine Months Ended |
|  | September 30, |
|  | 2014 |  |  | 2013 |
Research and development |  | $ | 259 |  |  | $ | 109 |
General and administrative |  |  | 651 |  |  |  | 143 |
|  | $ | 910 |  |  | $ | 252 |
| The Company recorded stock-based compensation expense related to stock options and restricted common stock in the following expense categories of its statements of operations:
|  | Year Ended December 31, |
|  | 2011 |  |  | 2012 |  |  | 2013 |
Research and development |  | $ | 30 |  |  | $ | 68 |  |  | $ | 176 |
General and administrative |  |  | 50 |  |  |  | 53 |  |  |  | 219 |
|  | $ | 80 |  |  | $ | 121 |  |  | $ | 395 |

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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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: 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=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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