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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 14,203 $ 793
Research and development incentive receivable 1,894 3,053
Prepaid expenses and other current assets 404 183
Total current assets 16,501 4,029
Property and equipment, net 148 119
Deferred offering costs   1,402
Other assets 930 907
Total assets 17,579 6,457
Current liabilities:    
Accounts payable 2,598 3,225
Accrued expenses 3,396 2,658
Notes payable and accrued interest - related party   30,274
Total current liabilities 5,994 36,157
Commitments and contingencies
Stockholders' equity (deficiency):    
Common stock, $0.001 par value; 100,000,000 and 58,500,000 shares authorized as of September 30, 2017 and December 31, 2016, respectively; 9,395,920 and 0 shares outstanding as of September 30, 2017 and December 31, 2016, respectively 9  
Additional paid-in capital 135,649 145
Accumulated other comprehensive income (loss) (269) 294
Accumulated deficit (123,804) (100,670)
Total stockholders' equity (deficiency) 11,585 (100,231)
Total liabilities, convertible preferred stock and stockholders' equity (deficiency) $ 17,579 6,457
Series A Redeemable Convertible Preferred Stock    
Current liabilities:    
Convertible preferred stock   11,800
Series B Convertible Preferred Stock    
Current liabilities:    
Convertible preferred stock   28,189
Series C Convertible Preferred Stock    
Current liabilities:    
Convertible preferred stock   $ 30,542