Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 94,068	$ 107,157
Accounts receivable, net	35,574	32,279
Prepaid expenses and other	7,050	5,752
Inventory	1,505	1,672
Total current assets	138,197	146,860
Non-current assets:
Property and equipment, net	13,035	13,399
Goodwill	133,031	133,031
Intangible assets, net	6,667	7,917
Deferred income tax assets	46,344	47,679
Other non-current assets	1,431	1,675
Total non-current assets	200,508	203,701
Total assets	338,705	350,561
Current liabilities:
Accounts payable	310	1,305
Accrued compensation and benefits	9,261	11,018
Accrued taxes	2,055	2,547
Deferred revenue	32,449	31,414
Other current liabilities	4,010	4,610
Total current liabilities	48,085	50,894
Non-current liabilities:
Deferred revenue	961	1,063
Other non-current liabilities	8,393	8,075
Total non-current liabilities	9,354	9,138
Total liabilities	57,439	60,032
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock	0	0
Common stock	2	2
Additional paid-in capital	92,102	99,819
Accumulated other comprehensive loss	(1,850)	(1,088)
Retained earnings	191,012	191,796
Total stockholders’ equity	281,266	290,529
Total liabilities and stockholders' equity	$ 338,705	$ 350,561