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Stock Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Shares |  |  |  |  |
Outstanding, beginning of period (in shares) |  |  | 433,389 |  |
Granted (in shares) |  |  | 454,320 |  |
Cancelled or forfeited (in shares) |  |  | (44,526) |  |
Outstanding, end of period (in shares) | 843,183 |  | 843,183 |  | 433,389
Vested and Exercisable (in shares) | 265,475 |  | 265,475 |  |
Weighted-Average Exercise Price |  |  |  |  |
Outstanding, beginning of period (in dollars per share) |  |  | $ 29.05 |  |
Granted (in dollars per share) |  |  | 4.86 |  |
Cancelled or forfeited (in dollars per share) |  |  | 32.27 |  |
Outstanding at end of year (in dollars per share) | $ 15.85 |  | 15.85 |  | $ 29.05
Vested and Exercisable (in dollars per share) | $ 35.74 |  | $ 35.74 |  |
Weighted Average Remaining Contractual Term (years) |  |  |  |  |
Outstanding |  |  | 8 years 5 months 5 days |  | 7 years 11 months 19 days
Vested and Exercisable |  |  | 6 years 8 months 16 days |  |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding | $ 352 |  | $ 352 |  |
Vested and Exercisable | $ 4 |  | $ 4 |  |
Stock options |  |  |  |  |
Stock Incentive Plans |  |  |  |  |
Vesting period |  |  | 4 years |  |
Cliff period for vesting |  |  | 1 year |  |
Exercisable period |  |  | 10 years |  |
Stock Incentive Plans |  |  |  |  |
Exercised (in shares) | 0 | 0 | 0 |  |
Intrinsic value of options exercised |  |  |  | $ 1 |
Aggregate fair value of options vested | $ 500 | $ 300 | $ 1,300 | $ 1,400 |
Weighted average grant date fair value of options granted (in dollars per share) | $ 4.10 | $ 4.64 | $ 3.25 | $ 6.64 |
Unrecognized compensation expense related to unvested stock option awards | $ 2,300 |  | $ 2,300 |  |
Weighted-average amortization period over which cost is expected to be recognized |  |  | 2 years 3 months 18 days |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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