Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 84,058	$ 76,504
Short-term investments	74,052	50,714
Accounts receivable, net of allowance of $500 and $590 at June 30, 2015 and December 31, 2014, respectively	34,552	32,993
Deferred tax assets, current	5,540	8,520
Prepaid expenses and other current assets	7,311	6,528
Total current assets	205,513	175,259
Long-term investments	29,031	39,448
Property and equipment, net	29,238	26,618
Deferred tax assets, net	14,035	14,119
Intangible assets, net	1,805	2,001
Goodwill	317	317
Other noncurrent assets	2,106	2,262
Total assets	282,045	260,024
Current liabilities:
Accounts payable	1,042	5,661
Accrued liabilities	10,598	10,353
Deferred revenues, current	87,411	81,147
Total current liabilities	99,051	97,161
Deferred revenues, noncurrent	9,711	10,064
Other noncurrent liabilities	1,115	972
Total liabilities	$ 109,877	$ 108,197
Commitments and contingencies (Note 5)
Stockholders’ equity:
Preferred stock, $0.001 par value; 20,000,000 shares authorized, no shares issued and outstanding at June 30, 2015 and December 31, 2014	$ 0	$ 0
Common stock, $0.001 par value; 1,000,000,000 shares authorized, 34,079,161 and 33,594,285 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively	34	34
Additional paid-in capital	209,139	195,133
Accumulated other comprehensive income	27	10
Accumulated deficit	(37,032)	(43,350)
Total stockholders’ equity	172,168	151,827
Total liabilities and stockholders’ equity	$ 282,045	$ 260,024