CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 58,247	$ 34,236
Short-term investments	214,139	113,846
Prepaid expenses and other current assets	4,152	2,589
Total current assets	276,538	150,671
Property, plant and equipment, net	939	840
Restricted cash	251	225
Total assets	277,728	151,736
Current liabilities:
Accounts payable	208	2,427
Deferred rent		83
Accrued expenses and other current liabilities	7,595	4,210
Total current liabilities	7,803	6,720
Long-term liabilities:
Deferred rent	288	228
Total liabilities	8,091	6,948
Commitments and contingencies
Preferred stock:
Convertible Preferred Stock, $0.001 par value: 10,000,000 shares authorized; no shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively
Stockholders’ equity:
Common stock, $0.001 par value: 120,000,000 shares authorized; 34,382,525 and 27,284,140 shares issued and outstanding September 30, 2018 and December 31, 2017, respectively	34	27
Additional paid-in capital	428,698	255,013
Accumulated deficit	(159,095)	(110,252)
Total stockholders’ equity	269,637	144,788
Total liabilities, convertible preferred stock and stockholders’ equity	$ 277,728	$ 151,736