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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Fair Value Measurement Techniques | The assumptions used to estimate fair value and the resulting grant date fair values are as follows:
| Employees |  | Non-employee Directors
| Years Ended December 31, |  | Years Ended December 31,
| 2016 |  | 2015 |  | 2014 |  | 2016 |  | 2015 |  | 2014
Expected dividend yield | — |  | — |  | — |  | — |  | — |  | —
Weighted average expected volatility | 67.18% |  | 64.42% |  | 68.57% |  | 67.61% |  | 63.46% |  | 64.10%
Weighted average risk-free interest rate | 1.48% |  | 1.60% |  | 2.05% |  | 1.41% |  | 1.62% |  | 1.75%
Weighted average expected term (in years) | 6.08 |  | 6.07 |  | 6.04 |  | 5.30 |  | 5.32 |  | 5.30
Forfeiture rate | 5.00% |  | 5.00% |  | 5.00% |  | 5.00% |  | 5.00% |  | 5.00%
Schedule of Share-based Compensation, Stock Options, Activity | The activity for the 2009 Plan, 2014 Plan and 2015 Plan for the years ended December 31, 2016 and 2015 is summarized as follows:
| Number of Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value
Outstanding — January 1, 2015 | 615,322 |  |  | $ | 9.55 |  |  | 9.48 |  | $ | 265 |
Granted | 880,116 |  |  | 8.17 |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Canceled | (115,711 | ) |  | 9.05 |  |  |  |  |
Outstanding — December 31, 2015 | 1,379,727 |  |  | $ | 8.71 |  |  | 7.18 |  | $ | — |
Exercisable — December 31, 2015 | 635,548 |  |  | $ | 9.41 |  |  | 4.56 |  | $ | — |
Vested or expected to vest — December 31, 2015 | 1,342,518 |  |  | $ | 8.73 |  |  | 7.11 |  | $ | — |
Outstanding — January 1, 2016 | 1,379,727 |  |  | $ | 8.71 |  |  | 7.18 |  | $ | — |
Granted | 497,978 |  |  | $ | 4.23 |  |  |  |  |
Exercised | — |  |  | $ | — |  |  |  |  |
Canceled | (58,261 | ) |  | $ | 7.47 |  |  |  |  |
Outstanding — December 31, 2016 | 1,819,444 |  |  | $ | 7.52 |  |  | 6.98 |  | $ | 32 |
Exercisable — December 31, 2016 | 1,022,515 |  |  | $ | 8.59 |  |  | 5.51 |  | $ | 15 |
Vested or expected to vest —December 31, 2016 | 1,779,597 |  |  | $ | 7.55 |  |  | 6.94 |  | $ | 31 |
Stock-Based Compensation Expense Related to Stock Options | Stock-based compensation expense related to stock options is included in the following line items in the accompanying statements of operations:
|  | Years Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Research and development, net |  | $ | 299 |  |  | $ | 300 |  |  | $ | 394 |
Selling, general and administrative |  | 911 |  |  | 2,515 |  |  | 648 |
Discontinued operations |  | — |  |  | 208 |  |  | 159 |
Total stock-based compensation expense |  | $ | 1,210 |  |  | $ | 3,023 |  |  | $ | 1,201 |

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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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