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Stockholders' Equity/(Deficit) (Tables) | 12 Months Ended
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Dec. 31, 2018
Federal Home Loan Banks [Abstract] |
Summary of Preferred Stock Allocated to Investors | The Purchase Agreement provides for the Company to issue and sell to the Investor shares of the Company’s preferred stock in the amounts set forth in the following table (numbers have been adjusted for the February 2016 reverse stock split):
Convertible Preferred Stock |  | Shares |  |  | Price Per Share |  |  | Total Investment |
Series AA-1 |  |  | 8,427,004 |  |  | $ | 12.00 |  |  | $ | 101,124,048 |
Series AA-2 |  |  | 7,223,145 |  |  | $ | 6.00 |  |  |  | 43,338,870 |
|  |  | 15,650,149 |  |  |  |  |  |  | $ | 144,462,918 |
Stock Options Valuation Assumptions | The assumptions used in the Black-Scholes model were as follows for stock options granted in the years ended December 31, 2018, 2017 and 2016:
|  | 2018 |  |  | 2017 |  |  | 2016
Risk-free interest rate |  |  | — |  |  |  | — |  |  | 1.29 - 2.25%
Expected volatility of common stock |  |  | — |  |  |  | — |  |  | 80.87 - 82.69%
Dividend yield |  |  | — |  |  |  | — |  |  | 0%
Expected life of options |  |  | — |  |  |  | — |  |  | 8.2 years
Summary of Stock Option Activity | Additional information with respect to both plans stock option activity is as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2015 |  |  | 375,283 |  |  | $ | 32.04 |
Granted |  |  | 22,493 |  |  | $ | 2.74 |
Exercised |  |  | — |  |  | $ | — |
Cancelled |  |  | (65,361 | ) |  | $ | 32.82 |
Outstanding at December 31, 2016 |  |  | 332,415 |  |  | $ | 21.55 |
Granted |  |  | — |  |  | $ | — |
Exercised |  |  | — |  |  | $ | — |
Cancelled |  |  | (84,598 | ) |  | $ | 35.59 |
Outstanding at December 31, 2017 |  |  | 247,817 |  |  | $ | 16.76 |
Granted |  |  | — |  |  | $ | — |
Exercised |  |  | — |  |  | $ | — |
Cancelled |  |  | (9,166 | ) |  | $ | 36.52 |
Outstanding at December 31, 2018 |  |  | 238,651 |  |  | $ | 15.95 |
Options exercisable at December 31, 2016 |  |  | 300,751 |  |  | $ | 22.30 |
Options exercisable at December 31, 2017 |  |  | 247,817 |  |  | $ | 16.76 |
Options exercisable at December 31, 2018 |  |  | 238,651 |  |  | $ | 15.95 |
Stock Options Outstanding | The following table summarizes information about stock options outstanding at December 31, 2018:
Stock Options Outstanding |
Range of Exercise Prices |  |  | Number of Shares Outstanding |  |  | Weighted Average Remaining Contractual Life in Years |  |  | Weighted Average Exercise Price |
| $26.40 - $26.40 |  |  |  | 75,158 |  |  |  | 5.00 |  |  | $ | 26.40 |
| $12.48 - $12.84 |  |  |  | 141,000 |  |  |  | 6.00 |  |  | $ | 12.48 |
| $2.02 - $3.59 |  |  |  | 22,493 |  |  |  | 7.65 |  |  | $ | 2.74 |
|  |  |  |  | 238,651 |  |  |  | 5.84 |  |  | $ | 15.95 |
Estimated Fair Value of Restricted Stock Award | A summary of the status of the restricted stock awards as of December 31, 2018 and changes during the year ended December 31, 2018 is presented as follows:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2017 |  |  | 132,826 |  |  | $ | 5.90 |
Granted |  |  | — |  |  | $ | — |
Vested |  |  | (91,159 | ) |  | $ | 3.55 |
Cancelled |  |  | — |  |  | $ | — |
Unvested at December 31, 2018 |  |  | 41,667 |  |  | $ | 11.04 |
Summary of Common Stock Warrants Outstanding | The following table summarizes our common stock warrants outstanding at December 31, 2018:
Common Stock Warrants |  | Exercise Price |  |  | Termination Date |
120,000 |  | $ | 3.52 |  |  |  | 10/01/2021 |
65,625 |  | $ | 12.00 |  |  |  | 07/12/2021 |
700,000 |  |  | 7.16 |  |  |  | 11/02/2023 |
885,625 |  |  |  |  |  |  |  |
Summary of Analysis of Activity in CARs Balances | The following is an analysis of activity in the CARs balances as of December 31, 2018:
|  | Number of CARs |
|  | Key Employee Plan |  |  | Nonemployee Director Plan |
Unvested at December 31, 2017 |  |  | 229,076 |  |  |  | — |
Granted |  |  | 406,384 |  |  |  | 278,000 |
Vested |  |  | (249,880 | ) |  |  | (278,000 | )
Cancelled |  |  | — |  |  |  | — |
Unvested at December 31, 2018 |  |  | 385,580 |  |  |  | — |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
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