Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 70,196	$ 10,206
Short-term investments	82,461	49,295
Accounts receivable		786
Prepaid expenses and other current assets	1,811	3,574
Total current assets	154,468	63,861
Long-term investments		2,978
Property and equipment, net	136	28
Other long-term assets	354
Total assets	154,958	66,867
Current liabilities:
Accounts payable	2,702	2,462
Accrued expenses and other current liabilities	5,360	3,559
Deferred revenue, current		1,796
Total current liabilities	8,062	7,817
Deferred revenue, long-term		6,735
Other non-current liabilities	12	22
Total liabilities	8,074	14,574
Commitments and contingencies (see Note 7)
Stockholders’ equity (deficit):
Preferred stock: $0.0001 par value; 20,000,000 shares and no shares authorized at September 30, 2018 and December 2017, respectively; no shares issued and outstanding at September 30, 2018 and December 31, 2017	0	0
Common stock: $0.0001 par value; 300,000,000 shares and 55,000,000 shares authorized at September 30, 2018 and December 31, 2017, respectively; 23,232,184 and 5,298,593 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	3	1
Additional paid-in capital	240,024	2,207
Accumulated other comprehensive loss	(101)	(51)
Accumulated deficit	(93,042)	(59,191)
Total stockholders’ equity (deficit)	146,884	(57,034)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	154,958	66,867
Series A Convertible Preferred Stock
Current liabilities:
Convertible preferred stock	0	14,183
Series B Convertible Preferred Stock
Current liabilities:
Convertible preferred stock	0	44,820
Series C Convertible Preferred Stock
Current liabilities:
Convertible preferred stock	$ 0	$ 50,324