On January 9, 2020, the Company entered into warrant exercise agreements (the "Exercise Agreements") with several accredited investors who are the holders (the "Holders") of certain warrants (the "Public Warrants") to purchase the Company's ordinary shares, represented by ADSs, pursuant to which the Holders exercised in cash their Public Warrants to purchase up to an aggregate of 22,278,540 ordinary shares represented by 742,618 ADSs having exercise prices ranging from USD 12.90 to USD 78.75 per ADS issued by the Company, at a reduced exercise price of USD 3.25 per ADS, for gross proceeds to the Company of approximately USD 2,400, prior to deducting placement agent fees and estimated offering expenses.

Under the Exercise Agreements, the Company issued to the Holders new unregistered warrants to purchase up to 22,278,540 ordinary shares represented by 742,618 ADSs (the "Private Placement Warrants"). The Private Placement Warrants are immediately exercisable, expire five and one-half years from issuance date and have an exercise price of USD 3.45 per ADS, subject to adjustment as set forth therein. The Private Placement Warrants may be exercised on a cashless basis if six months after issuance there is no effective registration statement registering the ADSs underlying the warrants.

Pursuant to the terms of the Exercise Agreements, the warrant holders agreed to exercise the warrants at a reduced exercise price, thereby creating a benefit to these warrant holders. As such, the Company recorded a deemed dividend in the amount of $715.

On February 10, 2020, the Company entered into a Securities Purchase Agreement with certain institutional investors pursuant to which the Company issued and sold (i) 1,825,000 units, each unit consisting of one ADS, and one warrant to purchase one ADS, at a price of USD 1.50 per unit, and (ii) 1,508,334 pre-funded units each pre-funded unit consisting of one pre-funded warrant to purchase one ADS and one warrant, at a price of USD 1.49 per pre-funded unit. The offering of the units and pre-funded units closed on February 12, 2020. 

The gross proceeds from the offering were approximately USD 5,000, prior to deducting the placement agent's fees and estimated offering expenses payable by the Company.

The placement agent in the offering also received compensation warrants exercisable for up to 250,000 ADSs at an exercise price of USD 1.875 per ADS expiring on February 10, 2025.

On June 10, 2020, the Company entered into a definitive agreement with certain institutional and accredited investors providing for the issuance of an aggregate of 3,902,440 ADSs in a registered direct offering at a purchase price of $2.05 per ADS for aggregate gross proceeds of approximately $8,000 prior to deducting the placement agent's fees and estimated offering expenses payable by the Company.

In addition, in a conrcurrent private placement the investors received unregistered warrants to purchase up to an aggregate of 1,951,220 ADSs. The warrants were immediately exercisable and will expire four and a half years from issuance at an exercise price of $2.50 per ADS, subject to adjustment as set forth therein. The warrants may be exercised on a cashless basis if there is no effective registration statement registering the ADSs underlying the warrants.

The placement agent in the offering also received compensation warrants on substantially the same terms as the investors in the offering in an amount equal to 7.5% of the aggregate number of ADSs sold in the offering (or warrants to purchase up to an aggregate of 292,683 ADSs), at an exercise price of $2.50 per ADSs and a term expiring four and a half years from the date of issuance.