CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 48,310	$ 63,798
Prepaid expenses and other current assets	2,914	1,264
Total current assets	51,224	65,062
Property and equipment, net	4,002	4,159
Other assets	3,143	389
Total assets	58,369	69,610
Current liabilities:
Accounts payable	1,590	1,771
Accrued expenses	3,410	2,488
Other current liabilities	457	384
Total current liabilities	5,457	4,643
Deferred rent, net of current portion	2,219	969
Commitments
Convertible preferred stock	175,490	161,111
Stockholders' equity (deficit):
Preferred stock
Common stock	1	1
Additional paid-in capital	23,923	22,441
Related party promissory note for the purchase of common stock		(598)
Accumulated other comprehensive income/(loss)	13	(4)
Accumulated deficit	(148,734)	(118,953)
Total stockholders' (deficit) equity	(124,797)	(97,113)
Total liabilities, convertible preferred stock and stockholders' (deficit)	$ 58,369	$ 69,610

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).