Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 95,233	$ 107,157
Accounts receivable, net	34,440	32,279
Prepaid expenses and other	7,928	5,752
Inventory	1,663	1,672
Total current assets	139,264	146,860
Non-current assets:
Property and equipment, net	12,655	13,399
Goodwill	133,031	133,031
Intangible assets, net	6,042	7,917
Deferred income tax assets	46,970	47,679
Other non-current assets	1,401	1,675
Total non-current assets	200,099	203,701
Total assets	339,363	350,561
Current liabilities:
Accounts payable	1,070	1,305
Accrued compensation and benefits	11,584	11,018
Accrued taxes	2,587	2,547
Deferred revenue	32,299	31,414
Other current liabilities	3,464	4,610
Total current liabilities	51,004	50,894
Non-current liabilities:
Deferred revenue	705	1,063
Other non-current liabilities	8,545	8,075
Total non-current liabilities	9,250	9,138
Total liabilities	60,254	60,032
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock	0	0
Common stock	2	2
Additional paid-in capital	92,880	99,819
Accumulated other comprehensive loss	(2,217)	(1,088)
Retained earnings	188,444	191,796
Total stockholders’ equity	279,109	290,529
Total liabilities and stockholders' equity	$ 339,363	$ 350,561