Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 179,090	$ 92,136
Accounts receivable	1,027	937
Prepaid expenses and other current assets	371	1,960
Total current assets	180,488	95,033
Restricted cash	473	473
Other assets	435
Property and equipment, net	1,883	1,816
Total assets	183,279	97,322
Current liabilities:
Accounts payable	1,597	1,537
Accrued expenses and other current liabilities	5,897	2,835
Total current liabilities	7,494	4,372
Other long-term liabilities	244	282
Total liabilities	7,738	4,654
Commitments and contingencies (see Note 10)
Stockholders' (deficit) equity:
Preferred stock, $0.01 par value, 10,000 and no shares authorized as of June 30, 2018 and December 31, 2017, respectively; no shares issued and outstanding as of June 30, 2018 and December 31, 2017, respectively
Common stock, $0.01 par value, 150,000 shares authorized, 33,155 issued and outstanding as of June 30, 2018 and 900,000 shares authorized, 5,342 issued and outstanding as of December 31, 2017	332	53
Additional paid-in capital	252,473	12,486
Accumulated deficit	(77,264)	(52,257)
Total stockholders’ equity (deficit)	175,541	(39,718)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit)	$ 183,279	97,322
Series A-1
Convertible preferred stock:
Convertible preferred stock		22,650
Series A-2
Convertible preferred stock:
Convertible preferred stock		39,979
Series B
Convertible preferred stock:
Convertible preferred stock		$ 69,757