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Stockholders' Equity and Stock-based Compensation (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | Nov. 30, 2015 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Shares issued of restricted common stock, shares |  | 35,427 | 25,273 |  |  |  |
Accrued royalty expense |  | $ 64 | $ 44 |  |  |  |
Proceeds from exercise of warrants |  |  |  |  |  | $ 2,643 | $ 179
Stock-based compensation |  |  |  |  |  | $ 1,950 | $ 2,265
2017 Incentive Stock and Awards Plan [Member] |  |  |  |  |  |  |
Maximum number of common stock issuance under the plan |  |  |  |  | 2,000,000 | 2,000,000 |
Common Stock Warrants [Member] |  |  |  |  |  |  |
Warrants exercise price |  |  |  |  | $ 1.79 | $ 1.79 |
Common Stock Warrant One [Member] |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  | 130,122 |
Warrants exercise price |  |  |  |  | $ 1.79 | $ 1.79 |
Number of warrants exercised |  |  |  |  |  | 321,945 |
Consultants Employees and Directors [Member] |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  | $ 17 |
Restricted Stock Units [Member] |  |  |  |  |  |  |
Shares issued of restricted common stock, shares |  |  |  |  |  | 65,536 |
Restricted Stock Units [Member] | Andrew R. Boll [Member] |  |  |  |  |  |  |
Shares issued of restricted common stock, shares | 30,000 |  |  |  |  |  |
Restricted Stock Units [Member] | John P. Saharek [Member] |  |  |  |  |  |  |
Shares issued of restricted common stock, shares | 30,000 |  |  |  |  |  |
Restricted Stock Units [Member] | Board of Directors [Member] |  |  |  |  |  |  |
Shares issued of restricted common stock, shares |  |  |  |  | 136,360 | 136,360 |
Fair market value of restricted shares |  |  |  |  | $ 300 | $ 300 |
Stock Option Plan [Member] |  |  |  |  |  |  |
Closing price of common stock price per share |  |  |  |  | $ 2.78 | $ 2.78 |
Stock options granted with exercise price contractual terms |  |  |  |  |  | 6 years 2 months 19 days |
Forfeiture factor, percentage |  |  |  |  |  | 10.00% |
Unrecognized compensation expense related to unvested stock options granted under the plan |  |  |  |  | $ 2,139 | $ 2,139 |
Expense expected to recognize over the weighted-average remaining vesting period |  |  |  |  |  | 2 years 2 months 12 days |
Stock-based compensation |  |  |  |  | 291 | $ 1,063 |
Stock Option Plan [Member] | Employees and Consultants [Member] |  |  |  |  |  |  |
Stock options granted with exercise price contractual terms |  |  |  |  |  | 10 years |
Stock options granted vesting terms |  |  |  |  |  | Vesting terms for options granted to employees and consultants during the nine months ended September 30, 2018 typically included one of the following vesting schedules: 25% of the shares subject to the option vest and become exercisable on the first anniversary of the grant date and the remaining 75% of the shares subject to the option vest and become exercisable quarterly in equal installments thereafter over three years; and 100% of the shares subject to the option vest on a quarterly basis in equal installments over three years. Certain option awards provide for accelerated vesting if there is a change in control (as defined in the Plan) and in the event of certain modifications to the option award agreement. |
Unvested RSUs [Member] |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested stock options granted under the plan |  |  |  |  | 756 | $ 756 |
Expense expected to recognize over the weighted-average remaining vesting period |  |  |  |  |  | 6 months |
Stock-based compensation |  |  |  |  | $ 293 | $ 870 |
Sales Agreement [Member] |  |  |  |  |  |  |
Number of shares sold under the agreement |  |  |  |  |  | 305,619 |
Proceeds from sale of common stock approximately |  |  |  |  |  | $ 642 |
Sales commission and offering expenses |  |  |  |  |  | 20 |
Available future sales |  |  |  |  |  | $ 7,378 |
Cantor Fitzgerald & Co [Member] | Sales Agreement [Member] |  |  |  |  |  |  |
Cash commission, percentage |  |  |  | 3.00% |  |  |

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