CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 76,251	$ 8,134
Research and development incentive receivable	1,730	0
Prepaid expenses and other current assets	1,234	1,205
Total current assets	79,215	9,339
Property and equipment, net	348	241
Goodwill	27,109	0
Right-of-use assets	2,110
Restricted cash, non-current	755	364
Total assets	109,537	9,944
Current liabilities:
Accounts payable	1,704	2,969
Accrued expenses	5,697	3,251
Current portion of lease liability	878
Current portion of long-term debt, net of discount	0	1,687
Total current liabilities	8,279	7,907
Preferred stock warrant liability	0	4,947
Long-term debt, including accretion, net of discount and current portion	19,986	8,145
Deferred rent		417
Lease liability	2,147
Other liabilities	18	205
Total liabilities	30,430	21,621
Commitments and contingencies (Note 10)
Convertible preferred stock (Series Seed, A and B), $0.001 par value; 10,000,000 and 59,413,523 shares authorized as of September 30, 2019 and December 31, 2018, respectively; 0 and 40,079,567 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively		64,675
Stockholders’ equity (deficit):
Common stock, $0.001 par value. 33,333,333 and 11,070,776 shares authorized as of September 30, 2019 and December 31, 2018, respectively; 12,436,205 and 351,652 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively	12	0
Additional paid-in capital	200,421	2,151
Accumulated other comprehensive income (loss)	(119)	0
Accumulated deficit	(121,207)	(79,237)
Total stockholders’ equity (deficit)	79,107	(77,086)
Total liabilities, convertible preferred stock, redeemable common stock and stockholders’ equity (deficit)	109,537	9,944
Convertible Preferred Stock
Current liabilities:
Convertible preferred stock (Series Seed, A and B), $0.001 par value; 10,000,000 and 59,413,523 shares authorized as of September 30, 2019 and December 31, 2018, respectively; 0 and 40,079,567 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively	0	64,675
Redeemable Common Stock
Stockholders’ equity (deficit):
Common stock, $0.001 par value. 33,333,333 and 11,070,776 shares authorized as of September 30, 2019 and December 31, 2018, respectively; 12,436,205 and 351,652 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively	$ 0	734
Total stockholders’ equity (deficit)		$ 734