CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 19,263	$ 56,865
Short-term investments	28,860	32,907
Accounts and other receivables (net of allowances for doubtful accounts of $0)	6,478	1,382
Prepaid expenses and other current assets	978	2,876
Total current assets	55,579	94,030
Property and equipment, net	3,405	4,016
Deferred income tax assets	437	359
Prepaid income taxes	0	4,997
Intangibles and other assets, net	351	365
Total assets	59,772	103,767
Current liabilities:
Accounts payable	4,835	5,951
Accrued compensation	1,916	4,753
Other current liabilities	4,015	4,409
Deferred revenue	4,885	5,909
Total current liabilities	15,651	21,022
Long-term deferred revenue	23,335	26,393
Other long-term liabilities	937	1,012
Total liabilities	39,923	48,427
Contingencies (Note 12)
Stockholders’ equity:
Common stock and additional paid-in capital — $0.001 par value; 100,000,000 shares authorized; 35,921,267 and 35,555,562 shares issued, respectively; 29,234,577 and 28,917,559 shares outstanding, respectively	225,942	221,098
Accumulated other comprehensive income	101	115
Accumulated deficit	(159,322)	(119,329)
Treasury stock at cost: 6,686,690 and 6,638,003 shares, respectively	(46,872)	(46,544)
Total stockholders’ equity	19,849	55,340
Total liabilities and stockholders’ equity	$ 59,772	$ 103,767