CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 25,737	$ 793
Research and development incentive receivable	1,744	3,053
Prepaid expenses and other current assets	177	183
Total current assets	27,658	4,029
Property and equipment, net	135	119
Deferred offering costs		1,402
Deferred tax asset	158
Other assets	1,111	907
Total assets	29,062	6,457
Current liabilities:
Accounts payable	2,622	3,225
Accrued expenses	3,461	2,658
Notes payable and accrued interest - related party		30,274
Total current liabilities	6,083	36,157
Non current liabilities:
Warrant liability	11,862
Total liabilities	17,945	36,157
Commitments and contingencies (Note 13)
Stockholders' equity (deficiency):
Common stock, $0.001 par value; 100,000,000 and 58,500,000 shares authorized as of December 31, 2017 and 2016, respectively; 12,354,014 and 0 shares outstanding as of December 31, 2017 and 2016, respectively	12
Additional paid-in capital	141,770	145
Accumulated other comprehensive income (loss)	(268)	294
Accumulated deficit	(130,397)	(100,670)
Total stockholders' equity (deficiency)	11,117	(100,231)
Total liabilities, convertible preferred stock and stockholders' equity	$ 29,062	6,457
Series A Redeemable Convertible Preferred Stock
Non current liabilities:
Convertible preferred stock		11,800
Series B Convertible Preferred Stock
Non current liabilities:
Convertible preferred stock		28,189
Series C Convertible Preferred Stock
Non current liabilities:
Convertible preferred stock		$ 30,542