CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 95,434	$ 36,308
Marketable securities	65,214	121,140
Accounts receivable		25,000
Prepaid expenses and other current assets	3,525	2,719
Total current assets	164,173	185,167
Property and equipment, net	4,013	4,171
Operating lease right-of-use asset	4,188	4,447
Restricted cash	2,498	2,498
Other long-term assets	830	98
Total assets	175,702	196,381
Current liabilities:
Accounts payable	2,229	1,130
Accrued expenses	7,376	9,610
Operating lease liability	1,203	1,135
Deferred revenue	16,273	20,923
Other current liabilities	19	16
Total current liabilities	27,100	32,814
Long-term portion of operating lease liability	3,832	4,168
Other long-term liabilities	14	9
Long-term portion of deferred revenue	46,109	46,489
Total liabilities	77,055	83,480
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized at March 31, 2020 and December 31, 2019; no shares issued and outstanding at March 31, 2020 and December 31, 2019
Common stock, $0.001 par value; 150,000,000 shares authorized and 29,833,174 shares issued and outstanding as of March 31, 2020; 150,000,000 shares authorized and 29,792,922 shares issued and outstanding as of December 31, 2019	30	30
Additional paid-in capital	273,301	270,682
Accumulated other comprehensive income	234	37
Accumulated deficit	(174,918)	(157,848)
Total stockholders' equity	98,647	112,901
Total liabilities and stockholders' equity	$ 175,702	$ 196,381