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Stock-Based Compensation (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Schedule of Allocated Stock-based Compensation Expense | The following table summarizes the components of stock-based compensation expense in the condensed consolidated statements of operations for the three and six months ended June 30, 2017 and 2016, respectively (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Research and development |  | $ | 35 |  |  | $ | 108 |  |  | $ | 73 |  |  | $ | 235 |
General and administrative |  |  | 162 |  |  |  | 514 |  |  |  | 352 |  |  |  | 1,043 |
Total stock-based compensation from continuing operations |  | $ | 197 |  |  | $ | 622 |  |  | $ | 425 |  |  | $ | 1,278 |
| The following table summarizes the components of stock-based compensation expense in the Consolidated Statements of Comprehensive Loss for the years ended December 31, 2016, 2015, and 2014 (in thousands):
|  | 2016 |  |  | 2015 |  |  | 2014 |
Research and development |  | $ | 298 |  |  | $ | 350 |  |  | $ | 484 |
General and administrative |  |  | 1,966 |  |  |  | 1,591 |  |  |  | 4,903 |
Total stock-based compensation |  | $ | 2,264 |  |  | $ | 1,941 |  |  | $ | 5,387 |
Assumptions for Option Grants Issued | The Company uses the Black-Scholes option-pricing model and the following weighted-average assumptions to determine the fair value of all its stock options granted:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2015* |  |  | 2017 |  |  | 2016 |
Risk free interest rate |  |  | 1.58 | % |  |  | 1.41 | % |  |  | 1.87 | % |  |  | 1.41 | %
Volatility |  |  | 132.13 | % |  |  | 76.30 | % |  |  | 116.41 | % |  |  | 75.63 | %
Expected lives (years) |  |  | 5.50 |  |  |  | 6.25 |  |  |  | 5.92 |  |  |  | 6.25 |
Expected dividend yield |  |  | — | % |  |  | — | % |  |  | — | % |  |  | — | %
| The Company uses the Black-Scholes option-pricing model and the following weighted-average assumptions to determine the fair value of all its stock options granted:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Risk free interest rate |  |  | 1.47 | % |  |  | 1.67 | % |  |  | 2.01 | %
Volatility |  |  | 102.62 | % |  |  | 73.97 | % |  |  | 79.37 | %
Expected lives (years) |  |  | 5.93 |  |  |  | 6.16 |  |  |  | 6.16 |
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
Stock Option Activity | The following table summarizes stock option activity of the Company for the six months ended June 30, 2017:
|  | Total Number of Shares (In Thousands) |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value (In Thousands) |
Outstanding at January 1, 2017 |  |  | 561 |  |  | $ | 41.50 |  |  |  |  |
Granted |  |  | 105 |  |  |  | 1.30 |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  | $ | — |
Canceled |  |  | (161 | ) |  |  | 34.21 |  |  | $ | — |
Outstanding at June 30, 2017 |  |  | 505 |  |  | $ | 35.49 |  |  | $ | — |
Options exercisable at June 30, 2017 |  |  | 300 |  |  | $ | 54.15 |  |  | $ | — |
| The following table summarizes option activity of the company:
|  | Total Number of Shares (In Thousands) |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2015 |  |  | 663 |  |  | $ | 51.60 |
Granted |  |  | 146 |  |  |  | 9.40 |
Exercised |  |  | (8 | ) |  |  | 31.44 |
Cancelled |  |  | (240 | ) |  |  | 50.28 |
Outstanding at December 31, 2016 |  |  | 561 |  |  | $ | 41.50 |
Options exercisable at December 31, 2016 |  |  | 329 |  |  | $ | 56.06 |

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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=6415400&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=6415400&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 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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