Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 34,797	$ 19,145
Marketable securities	32,369	21,355
Prepaid expenses and other current assets	781	707
Total current assets	67,947	41,207
Property and equipment, net	120	3
Total assets	68,067	41,210
Current liabilities:
Accounts payable	1,285	762
Accrued expenses	5,151	4,038
Total current liabilities	6,436	4,800
Total liabilities	6,436	4,800
Stockholders' equity:
Preferred stock, par value $0.0001 per share authorized: 5,000,000 shares at June 30, 2017 and December 31, 2016; 1,969,797 and no shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively
Common stock, par value $0.0001 per share authorized: 200,000,000 at June 30, 2017 and December 31, 2016, respectively; 12,495,705 and 11,951,866 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	1	1
Additional paid-in-capital	151,247	111,691
Accumulated other comprehensive income	36	25
Accumulated deficit	(89,653)	(75,307)
Total stockholders' equity	61,631	36,410
Total liabilities and stockholders' equity	$ 68,067	$ 41,210

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).