Stock- Based Compensation (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands |
1 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 01, 2020 |
Jun. 11, 2020 |
Feb. 06, 2020 |
Feb. 13, 2019 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Feb. 06, 2019 |
Jan. 02, 2019 |
Dec. 31, 2018 |
Oct. 06, 2018 |
Oct. 02, 2018 |
Dec. 31, 2016 |
|
| Directors receives service, description | Non-employee members of the Board of Directors were granted an aggregate of 103,404 shares of Common Stock as compensation, in lieu $111 of cash compensation, for service as directors during the year ended December 31, 2020. The Company recorded $56 in accrued expenses as of December 30, 2020, in relation to the service as directors for the three months ended December 31, 2020. On January 13, 2021, the non-employee members of the Board of Directors were granted an aggregate of 52,317 shares of Common Stock as compensation, in lieu of cash compensation, for service as directors during the fourth quarter of 2020, pursuant to the Company's non-employee director compensation policy. The number of shares granted to the Company's directors, in lieu of cash compensation, is determined by the dollar amount of quarterly fees due under the non-employee director compensation policy divided by the fair market value of a share of Common Stock as of the grant date. | |||||||||||
| General and administrative expense | $ 9,562 | $ 9,497 | ||||||||||
| Description of service agreement | The Company entered into a services agreement whereby it agreed to issue warrants to purchase 50,000 shares of common stock of the Company which vested immediately. The warrants are exercisable at $1.17 per share and expire three years from the date of issuance. The fair value of the warrants were valued on the date of grant at $28 using the Black-Scholes option-pricing model with the following parameters: (1) risk-free interest rate of 0.22%; (2) expected life in years of 3.0; (3) expected stock volatility of 73.06%; and (4) expected dividend yield of 0%. The Company recorded $28 as general and administrative expense in the accompanying consolidated statement of comprehensive loss in relation to the consulting agreement for the year ended December 31, 2020. On July 10, 2020 and August 3, 2020, the Company issued an aggregate of 50,000 shares of common stock upon exercise of the warrant which resulted in aggregate proceeds of approximately $59. | |||||||||||
| Common stock issuable upon exercise of outstanding warrants | 17,048,051 | |||||||||||
| Description of incentive plan | On January 1, 2021, pursuant to an annual evergreen provision, the number of shares of common stock reserved for future grants was increased by 1,936,339 shares. Under the 2016 Plan, effective as of January 1, 2021, the maximum number of shares of the Company's common stock authorized for issuance is 7,592,663. As of December 31, 2020, there were 387 shares of common stock available for future grant under the 2016 Plan. | |||||||||||
| Weighted-average recognition period | 9 months 22 days | |||||||||||
| Number of outstanding options to purchase | 2,537,941 | |||||||||||
| Weighted-average exercise price (in dollars per share) | $ 4.18 | |||||||||||
| Unamortized share based compensation for stock options | $ 2,131 | |||||||||||
| Share based compensation expense related to stock options | 2,299 | 2,393 | ||||||||||
| Restricted stock unit | 501,265 | |||||||||||
| Unamortized stock compensation for restricted stock units | $ 897 | |||||||||||
| Weighted-average recognition period restricted stock units | 1 year 29 days | |||||||||||
| Restricted Stock Units (RSUs) [Member] | ||||||||||||
| General and administrative expense | $ 476 | $ 280 | ||||||||||
| Granted | 260,154 | 76,112 | ||||||||||
| Common Stock [Member] | ||||||||||||
| Percentage of number of shares | 6.00% | |||||||||||
| Warrant [Member] | ||||||||||||
| Warrant exercise price (in dollars per share) | $ 1.86 | $ 5.24 | $ 5.24 | |||||||||
| Agreement [Member] | Common Stock [Member] | ||||||||||||
| Securities purchase agreement, description | The Company entered into a securities purchase agreement (the "Securities Purchase Agreement") under which it sold and issued to an institutional investor (the "Holder"), in a registered direct offering, an aggregate of 3,200,000 shares of the Company's common stock par value $0.0001 per share (the "Common Stock"), and pre-funded warrants to purchase an aggregate of 5,533,625 shares of Common Stock (the "Pre-Funded Warrants"). The offering price was $1.145 for each share of Common Stock and $1.144 for each Pre-Funded Warrant. The Pre-Funded Warrants were immediately exercisable at a price of $0.001 per share of Common Stock. The shares of common stock into which the pre-funded warrants may be exercised are considered outstanding for the purposes of computing earnings per share because the shares may be issued for little or no consideration, are fully vested, and are exercisable after the original issuance date. Pursuant to the Securities Purchase Agreement, in a concurrent private placement, the Company has also agreed to sell and issue to the purchaser warrants to purchase up to 8,733,625 shares of Common Stock (the "Private Placement Warrants"). These warrants were immediately exercisable at an exercise price of $1.30 per share and expire on the fifth anniversary of the date of issuance. In connection with the closing of the offering, the Company received gross proceeds of $9,994 before deducting placement agent fees and other offering expenses of $849, from the issuance of the Common Stock, the Pre-Funded Warrants and the Private Placement Warrants. | |||||||||||
| Agreement [Member] | Warrant [Member] | ||||||||||||
| Securities purchase agreement, description | The Securities Purchase Agreement, as described above, the Company issued the Pre-Funded Warrants to purchase up to 5,533,625 shares of its common stock with the aggregate exercise price already being pre-funded to the Company on September 1, 2020 and, consequently, no additional consideration other than the nominal exercise price of $0.001 per warrant share shall be required to be paid to effect any exercise of the Pre-Funded Warrants. The Pre-Funded Warrants will be exercisable until it is exercised in full. Pursuant to the Securities Purchase Agreement, on September 1, 2020, the Company also issued the Private Placement Warrants to purchase 8,733,625 of its common stock at an exercise price of $1.30 per share that expires on September 1, 2025. The terms of both warrants include certain provisions related to fundamental transactions, a cashless exercise provision in the event registered shares are not available, and do not include any mandatory redemption provisions. Therefore, the warrants have been classified as equity upon issuance. As of February 16, 2021, the Pre-Funded Warrants for 5,533,625 shares of common stock and the Private Placement Warrants for 8,733,625 shares of common stock have been exercised. | |||||||||||
| Consultant Agreement [Member] | Warrant [Member] | ||||||||||||
| Number of warrants purchased | 25,000 | 25,000 | ||||||||||
| Warrant exercise price (in dollars per share) | $ 10.00 | $ 8.75 | ||||||||||
| Expected life | 24 months | 18 months | ||||||||||
| Consultant Agreement [Member] | Warrant [Member] | Consultant [Member] | ||||||||||||
| Number of warrants purchased | 10,000 | 10,000 | ||||||||||
| Warrant exercise price (in dollars per share) | $ 7.25 | $ 6.25 | ||||||||||
| Amended and Restated Employment Agreement [Member] | Warrant [Member] | ||||||||||||
| Number of warrants purchased | 50,000 | |||||||||||
| Warrant exercise price (in dollars per share) | $ 5.00 | |||||||||||
| General and administrative expense | $ 90 | |||||||||||
| Expiration date | Mar. 20, 2022 | |||||||||||
| Amended and Restated Employment Agreement [Member] | November 2019 Consultant Warrant [Member] | ||||||||||||
| Number of warrants purchased | 30,000 | |||||||||||
| Warrant exercise price (in dollars per share) | $ 5.00 | |||||||||||
| General and administrative expense | 55 | |||||||||||
| Expiration date | Mar. 20, 2022 | |||||||||||
| Services Agreement [Member] | Common Stock [Member] | ||||||||||||
| Number of warrants purchased | 120,000 | |||||||||||
| Warrant exercise price (in dollars per share) | $ 3.50 | |||||||||||
| Remaining warrants granted | 60,000 | |||||||||||
| Services Agreement [Member] | Warrant [Member] | ||||||||||||
| General and administrative expense | $ 102 | $ 75 | ||||||||||
| Fair value of warrants | $ 112 | |||||||||||
| Exercise price (in dollars per share) | $ 2.16 | |||||||||||
| Granted | 60,000 | |||||||||||
| Risk-free interest rate | 1.43% | |||||||||||
| Expected life in years | 3 years | |||||||||||
| Expected stock volatility | 74.82% | |||||||||||
| Expected dividend yield | 0.00% | |||||||||||