Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 93,027	$ 87,559
Short-term marketable securities	225,734	211,331
Accounts receivable, net of allowance of $664 and $585 as of September 30, 2020 and December 31, 2019, respectively	64,291	78,034
Prepaid expenses and other current assets	22,480	18,692
Total current assets	405,532	395,616
Long-term marketable securities	133,260	119,508
Property and equipment, net	67,574	60,579
Operating leases - right of use asset	47,985	40,551
Deferred tax assets, net	13,581	18,830
Intangible assets, net	13,651	16,795
Goodwill	7,447	7,447
Restricted cash	1,200	1,200
Other noncurrent assets	16,854	15,082
Total assets	707,084	675,608
Current liabilities:
Accounts payable	2,223	848
Accrued liabilities	24,772	22,784
Deferred revenues, current	200,283	192,172
Operating lease liabilities, current	11,777	7,663
Total current liabilities	239,055	223,467
Deferred revenues, noncurrent	19,157	20,935
Operating lease liabilities, noncurrent	48,392	44,015
Other noncurrent liabilities	181	388
Total liabilities	306,785	288,805
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.001 par value; 20,000,000 shares authorized, no shares issued and outstanding at September 30, 2020 and December 31, 2019	0	0
Common stock, $0.001 par value; 1,000,000,000 shares authorized; 39,119,169 and 39,146,272 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	39	39
Additional paid-in capital	388,814	362,408
Accumulated other comprehensive income	1,075	1,162
Retained earnings	10,371	23,194
Total stockholders’ equity	400,299	386,803
Total liabilities and stockholders’ equity	$ 707,084	$ 675,608