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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Option Activity | A summary of activity for the year ended December 31, 2018 is as follows:
| Options |  |  | Weighted Average Exercise Price |
Balance as of January 1, 2018 |  | 2,017 |  |  | $ | 5,962.50 |
Granted |  | 2,346 |  |  | $ | 108.00 |
Expired |  | (20 | ) |  | $ | 38,553.50 |
Cancelled/forfeited |  | (1,591 | ) |  | $ | 296.50 |
Balance as of December 31, 2018 |  | 2,752 |  |  | $ | 4,003.50 |
Stock Options Vested and Expected to Vest |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Balance as of December 31, 2018 |  |  | 2,752 |  |  | $ | 4,003.50 |  |  |  | 7.90 |  |  | $ | — |
Vested and expected to vest at December 31, 2018 |  |  | 2,452 |  |  | $ | 4,447.00 |  |  |  | 7.78 |  |  | $ | — |
Exercisable at December 31, 2018 |  |  | 1,296 |  |  | $ | 8,099.50 |  |  |  | 6.59 |  |  | $ | — |
Weighted-average Assumptions | The fair value of each option awarded during the year ended December 31, 2018 and 2017 was estimated on the date of grant using the Black-Scholes-Merton option valuation model based on the following weighted-average assumptions:
|  | Years ended December 31, |
|  | 2018 |  |  | 2017 |
Expected term |  | 7.1 years |  |  | 6.6 years |
Risk-free interest rate |  |  | 2.94 | % |  |  | 2.20 | %
Volatility |  |  | 92.87 | % |  |  | 78.84 | %
Dividends |  |  | — |  |  |  | — |
Resulting weighted average grant date fair value |  | $ | 1.74 |  |  | $ | 1.05 |
Compensation Cost Recognized for Stock Options and Restricted Stock Awards | The following summarizes the total compensation cost recognized for the stock options and restricted stock awards in the accompanying financial statements (in thousands):
|  | Years ended December 31, |
|  | 2018 |  |  | 2017 |
Total compensation cost for share-based payment arrangements recognized in the statement of operations (net of tax of $0) |  | $ | 355 |  |  | $ | 753 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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