Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 100,916	$ 101,267
Accounts receivable, net of allowance of $333 and $374, respectively	53,919	57,564
Prepaid expenses and other current assets	8,660	5,069
Total current assets	163,495	163,900
Property and equipment, net	28,095	25,386
Goodwill	1,923	1,923
Intangible assets, net	5,569	6,074
Deferred tax assets	17,747	16,348
Other non-current assets	8,943	10,545
Total assets	225,772	224,176
Current liabilities:
Accounts payable	2,495	2,536
Accrued compensation and related benefits	5,608	6,493
Accrued and other current liabilities	2,330	2,627
Deferred revenues – current portion	9,369	7,981
Total current liabilities	19,802	19,637
Long-term income taxes payable	4,652	3,902
Other non-current liabilities	994	2,269
Total liabilities	25,448	25,808
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.00015 par value, 70,000 shares authorized: shares issued 40,298 and 39,799, respectively; shares outstanding 32,075 and 32,112, respectively	5	5
Additional paid-in-capital	304,948	297,950
Treasury stock at cost, 8,224 and 7,688 shares, respectively	(78,422)	(71,793)
Accumulated deficit	(25,256)	(27,089)
Accumulated other comprehensive loss	(951)	(705)
Total stockholders’ equity	200,324	198,368
Total liabilities and stockholders’ equity	$ 225,772	$ 224,176