Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 56,865	$ 25,013
Short-term investments	32,907	39,918
Accounts and other receivables (net of allowances for doubtful accounts of: $0 and $15, respectively)	1,382	1,213
Prepaid expenses and other current assets	2,876	2,790
Total current assets	94,030	68,934
Property and equipment, net	4,016	4,589
Deferred income tax assets	359	24,633
Prepaid income taxes	4,997	6,995
Intangibles and other assets, net	365	264
Total assets	103,767	105,415
Current liabilities:
Accounts payable	5,951	650
Accrued compensation	4,753	4,840
Other current liabilities	4,409	2,999
Deferred revenue	5,909	6,696
Total current liabilities	21,022	15,185
Long-term deferred revenue	26,393	2,516
Other long-term liabilities	1,012	1,099
Total liabilities	48,427	18,800
Commitments and contingencies (Notes 8 and 15)
Stockholders’ equity:
Common stock and additional paid-in capital – $0.001 par value; 100,000,000 shares authorized; 35,555,562 and 34,845,310 shares issued, respectively; 28,917,559 and 28,329,416 shares outstanding, respectively	221,098	212,115
Accumulated other comprehensive income	115	86
Accumulated deficit	(119,329)	(79,948)
Treasury stock at cost: 6,638,003 and 6,515,894 shares, respectively	(46,544)	(45,638)
Total stockholders’ equity	55,340	86,615
Total liabilities and stockholders’ equity	$ 103,767	$ 105,415