CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 55,961	$ 86,478
Short-term investments	0	3,019
Accounts and other receivables	1,366	3,385
Prepaid expenses and other current assets	9,950	14,078
Total current assets	67,277	106,960
Property and equipment, net	242	1,226
Deposits Assets, Noncurrent	11,884	7,062
Other assets	8,033	9,600
Total assets	87,436	124,848
Current liabilities:
Accounts payable	174	809
Accrued compensation	831	2,844
Other current liabilities	2,252	3,478
Deferred revenue	5,236	4,692
Total current liabilities	8,493	11,823
Long-term deferred revenue	22,424	25,952
Other long-term liabilities	2,505	3,316
Total liabilities	33,422	41,091
Contingencies (Note 10)
Stockholders’ equity:
Common stock and additional paid-in capital — $0.001 par value; 100,000,000 shares authorized; 39,058,091 and 38,624,784 shares issued, respectively; 26,914,658 and 31,414,328 shares outstanding, respectively	256,875	253,289
Accumulated other comprehensive income	122	124
Accumulated deficit	(121,250)	(118,565)
Treasury stock at cost: 12,143,433 and 7,210,456 shares, respectively	(81,733)	(51,091)
Total stockholders’ equity	54,014	83,757
Total liabilities and stockholders’ equity	$ 87,436	$ 124,848