Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 96,788	$ 101,267
Accounts receivable, net of allowance of $333 and $374, respectively	52,744	57,564
Prepaid expenses and other current assets	10,890	5,069
Total current assets	160,422	163,900
Property and equipment, net	34,120	25,386
Goodwill	1,923	1,923
Intangible assets, net	5,317	6,074
Deferred tax assets	17,714	16,348
Other non-current assets	8,163	10,545
Total assets	227,659	224,176
Current liabilities:
Accounts payable	3,286	2,536
Accrued compensation and related benefits	4,969	6,493
Accrued and other current liabilities	4,386	2,627
Deferred revenues – current portion	7,360	7,981
Billings in excess of recognized revenues	669
Total current liabilities	20,670	19,637
Long-term income taxes payable	4,140	3,902
Other non-current liabilities	1,954	2,269
Total liabilities	26,764	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 40,509 and 39,799, respectively; shares outstanding 32,257 and 32,112, respectively	5	5
Additional paid-in-capital	308,098	297,950
Treasury stock at cost, 8,252 and 7,688 shares, respectively	(78,752)	(71,793)
Accumulated deficit	(27,337)	(27,089)
Accumulated other comprehensive loss	(1,119)	(705)
Total stockholders’ equity	200,895	198,368
Total liabilities and stockholders’ equity	$ 227,659	$ 224,176