Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 165,578	$ 92,136
Restricted cash	252
Accounts receivable	593	937
Prepaid expenses and other current assets	1,169	1,960
Total current assets	167,592	95,033
Other assets	674	473
Property and equipment, net	1,813	1,816
Total assets	170,079	97,322
Current liabilities:
Accounts payable	1,208	1,537
Accrued expenses and other current liabilities	6,465	2,835
Total current liabilities	7,673	4,372
Other long-term liabilities	435	282
Total liabilities	8,108	4,654
Commitments and contingencies (see Note 10)
Stockholders' equity (deficit):
Preferred stock, $0.01 par value, 10,000 and no shares authorized as of September 30, 2018 and December 31, 2017, respectively; no shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively
Common stock, $0.01 par value, 150,000 shares authorized, 33,229 issued and outstanding as of September 30, 2018 and 900,000 shares authorized, 5,342 issued and outstanding as of December 31, 2017	332	53
Additional paid-in capital	253,084	12,486
Accumulated deficit	(91,445)	(52,257)
Total stockholders’ equity (deficit)	161,971	(39,718)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	$ 170,079	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