CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 54,101	$ 86,478
Short-term investments	0	3,019
Accounts and other receivables	1,789	3,385
Prepaid expenses and other current assets	8,791	14,078
Total current assets	64,681	106,960
Property and equipment, net	252	1,226
Long-term Deposits	11,700	7,062
Other assets	8,987	9,600
Total assets	85,620	124,848
Current liabilities:
Accounts payable	474	809
Accrued compensation	1,803	2,844
Other current liabilities	2,446	3,478
Deferred revenue	4,617	4,692
Total current liabilities	9,340	11,823
Long-term deferred revenue	23,571	25,952
Other long-term liabilities	2,979	3,316
Total liabilities	35,890	41,091
Contingencies (Note 10)
Stockholders’ equity:
Common stock and additional paid-in capital — $0.001 par value; 100,000,000 shares authorized; 39,007,576 and 38,624,784 shares issued, respectively; 26,864,143 and 31,414,328 shares outstanding, respectively	255,446	253,289
Accumulated other comprehensive income	122	124
Accumulated deficit	(124,105)	(118,565)
Treasury stock at cost: 12,143,433 and 7,210,456 shares, respectively	(81,733)	(51,091)
Total stockholders’ equity	49,730	83,757
Total liabilities and stockholders’ equity	$ 85,620	$ 124,848