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Stock Option Plan and Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Schedule of Stock Option Activity | Stock option activity under the Plan is as follows:
|  | Shares Issuable Pursuant to Stock Options |  |  | Weighted- Average Exercise Price |
Outstanding January 1, 2017 |  |  | 3,974,143 |  |  | $ | 6.61 |
Granted |  |  | 435,000 |  |  | $ | 8.76 |
Exercised |  |  | (197,874 | ) |  | $ | 5.71 |
Forfeited |  |  | (213,619 | ) |  | $ | 8.09 |
Outstanding September 30, 2017 |  |  | 3,997,650 |  |  | $ | 6.80 |
Exercisable September 30, 2017 |  |  | 2,301,624 |  |  | $ | 6.00 |
Available for future grant |  |  | 1,375,154 |  |  |  |  |
Summary of Assumptions Used in Black Scholes Model to Estimate Fair Value of Stock Options | The Company uses the Black Scholes model to estimate the fair value of stock options granted. For stock options granted during the nine months ended September 30, 2017 and 2016, the Company utilized the following assumptions:
|  | September 30, |
|  | 2017 |  |  | 2016 |
Expected term (years) |  | 5.5-6.25 |  |  | 5.5-6.25 |
Risk free interest rate |  | 1.83-2.02% |  |  | 1.17-1.52% |
Volatility |  | 79-84% |  |  |  | 78% |
Dividend yield |  |  | 0% |  |  |  | 0% |
Weighted average grant date fair value per share of common stock |  | $ | 5.08 |  |  | $ | 5.53 |
Schedule of RSU Activity | RSU activity under the Plan for the nine months ended September 30, 2017 is as follows:
|  |  |  |  |  | Weighted-Average |
|  |  |  |  |  | Grant Date |
|  | RSUs |  |  | Fair Value |
Unvested January 1, 2017 |  |  | 219,600 |  |  | $ | 13.45 |
Granted |  |  | - |  |  | $ | - |
Vested |  |  | - |  |  | $ | - |
Forfeited |  |  | (25,000 | ) |  | $ | 13.45 |
Unvested September 30, 2017 |  |  | 194,600 |  |  | $ | 13.45 |
Non-Employees Stock Options |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Assumptions Used in Black Scholes Model to Estimate Fair Value of Stock Options | For stock options granted to non-employees, the Company utilized the following assumptions:
|  | September 30, |
|  | 2017 |  |  | 2016 |
Expected term (years) |  | 8.9-9.5 |  |  | 9.9 |
Risk free interest rate |  | 2.27-2.31% |  |  |  | 1.60% |
Volatility |  | 111-112% |  |  |  | 101% |
Dividend yield |  |  | 0% |  |  |  | 0% |
Weighted average grant date fair value per share of common stock |  | $ | 6.85 |  |  | $ | 12.76 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option 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 (d) -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 (e) -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 (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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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. + References No definition available. + Details
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