CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 78,860	$ 72,624
Short term investments	40,469
Prepaid expenses	2,897	2,619
VAT receivable	298	310
Other current assets	12	94
Total current assets	122,536	75,647
Restricted cash	182	182
Property and equipment, net	110	127
Right-of-use lease assets - operating, net	1,002	1,179
Deposits and other assets	89	148
Total assets	123,919	77,283
Current liabilities
Accounts payable	770	1,142
Accrued expenses	4,724	3,688
Lease obligation - operating, short term	435	407
Total current liabilities	5,929	5,237
Term loan, long term	19,076	18,915
Lease obligation - operating, long term	717	943
Derivative liability		765
Other liabilities	138	58
Total liabilities	25,860	25,918
Commitments and contingencies (Note 11)
Stockholders’ equity
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued and outstanding
Common stock, $0.0001 par value; 150,000,000 shares authorized as of June 30, 2020; 19,418,955 and 27,287,997 shares issued and outstanding as of December 31, 2019 and June 30, 2020, respectively	3	2
Additional paid-in capital	242,898	180,818
Accumulated deficit	(144,842)	(129,455)
Total stockholders’ equity	98,059	51,365
Total liabilities and stockholders’ equity	$ 123,919	$ 77,283