CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 43,110	$ 56,865
Short-term investments	32,867	32,907
Accounts and other receivables (net of allowances for doubtful accounts of $0)	1,909	1,382
Prepaid expenses and other current assets	727	2,876
Total current assets	78,613	94,030
Property and equipment, net	3,855	4,016
Deferred income tax assets	359	359
Prepaid income taxes	0	4,997
Intangibles and other assets, net	369	365
Total assets	83,196	103,767
Current liabilities:
Accounts payable	6,951	5,951
Accrued compensation	2,079	4,753
Other current liabilities	5,330	4,409
Deferred revenue	4,902	5,909
Total current liabilities	19,262	21,022
Long-term deferred revenue	25,354	26,393
Other long-term liabilities	990	1,012
Total liabilities	45,606	48,427
Contingencies (Note 11)
Stockholders’ equity:
Common stock and additional paid-in capital — $0.001 par value; 100,000,000 shares authorized; 35,802,061 and 35,555,562 shares issued, respectively; 29,164,058 and 28,917,559 shares outstanding, respectively	223,231	221,098
Accumulated other comprehensive income	93	115
Accumulated deficit	(139,190)	(119,329)
Treasury stock at cost: 6,638,003 shares	(46,544)	(46,544)
Total stockholders’ equity	37,590	55,340
Total liabilities and stockholders’ equity	$ 83,196	$ 103,767