Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 159,220	$ 138,710
Short-term investments	9,027	18,455
Restricted cash	192	249
Accounts receivable, net	77,485	63,860
Prepaid expenses and other current assets	26,228	34,398
Total current assets	272,152	255,672
Patent assets, net	119,619	131,888
Property and equipment, net	5,025	5,090
Intangible assets, net	47,716	49,087
Goodwill	72,511	70,756
Restricted cash, less current portion	968	968
Deferred tax assets	27,257	27,939
Other assets	18,985	20,233
Total assets	564,233	561,633
Current liabilities:
Accounts payable	3,610	2,225
Accrued liabilities	11,011	15,736
Deferred revenue	89,246	85,790
Other current liabilities	2,115	1,485
Total current liabilities	105,982	105,236
Deferred revenue, less current portion	349	484
Deferred tax liabilities	3,697	3,657
Other liabilities	11,012	11,104
Total liabilities	121,040	120,481
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common stock	5	5
Additional paid-in capital	378,748	376,793
Retained earnings	68,390	70,808
Accumulated other comprehensive loss	(3,950)	(6,454)
Total stockholders’ equity	443,193	441,152
Total liabilities and stockholders’ equity	$ 564,233	$ 561,633