Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 101,302	$ 107,157
Accounts receivable, net	37,068	32,279
Prepaid expenses and other	7,789	5,752
Inventory	1,649	1,672
Total current assets	147,808	146,860
Non-current assets:
Property and equipment, net	12,622	13,399
Goodwill	133,031	133,031
Intangible assets, net	7,292	7,917
Deferred income tax assets	45,593	47,679
Other non-current assets	1,522	1,675
Total non-current assets	200,060	203,701
Total assets	347,868	350,561
Current liabilities:
Accounts payable	1,049	1,305
Accrued compensation and benefits	9,177	11,018
Accrued taxes	2,097	2,547
Deferred revenue	30,590	31,414
Other current liabilities	4,455	4,610
Total current liabilities	47,368	50,894
Non-current liabilities:
Deferred revenue	964	1,063
Other non-current liabilities	8,282	8,075
Total non-current liabilities	9,246	9,138
Total liabilities	56,614	60,032
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock	0	0
Common stock	2	2
Additional paid-in capital	98,233	99,819
Accumulated other comprehensive loss	(1,508)	(1,088)
Retained earnings	194,527	191,796
Total stockholders’ equity	291,254	290,529
Total liabilities and stockholders' equity	$ 347,868	$ 350,561