Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 63,118	$ 49,542
Short-term investments	132,049	202,519
Prepaid expenses and other current assets	8,334	6,628
Total current assets	203,501	258,689
Property and equipment, net	3,901	1,120
Right-of-use asset	3,085
Restricted cash	401	401
Total assets	210,888	260,210
Current liabilities:
Accounts payable	6,565	7,640
Accrued expenses and other current liabilities	19,146	5,942
Lease liability	379
Total current liabilities	26,090	13,582
Long-term liabilities:
Lease liability	3,331
Deferred rent		372
Total liabilities	29,421	13,954
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value: 120,000,000 shares authorized; 34,497,542 and 34,410,725 shares issued and outstanding June 30, 2019 and December 31, 2018, respectively	34	34
Additional paid-in capital	437,805	430,824
Accumulated deficit	(256,372)	(184,602)
Total stockholders’ equity	181,467	246,256
Total liabilities and stockholders’ equity	$ 210,888	$ 260,210

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).

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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).