Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 88,285	$ 42,369
Short-term investments	25,133	54,827
Accounts receivable, net of allowance of $543 and $389 at September 30, 2014 and December 31, 2013, respectively	30,278	28,581
Prepaid expenses and other current assets	5,901	4,679
Total current assets	149,597	130,456
Long-term investments	37,896	35,608
Property and equipment, net	24,776	23,075
Intangible assets, net	2,099	2,394
Goodwill	317	317
Other noncurrent assets	726	753
Total assets	215,411	192,603
Current liabilities:
Accounts payable	1,898	1,930
Accrued liabilities	9,101	9,037
Deferred revenues, current	74,337	67,505
Capital lease obligations, current	0	805
Total current liabilities	85,336	79,277
Deferred revenues, noncurrent	8,965	8,889
Other noncurrent liabilities	1,417	1,320
Total liabilities	95,718	89,486
Commitments and contingencies (Note 5)
Stockholders’ equity:
Preferred stock, $0.001 par value; 20,000,000 shares authorized, no shares issued and outstanding at September 30, 2014 and December 31, 2013	0	0
Common stock, $0.001 par value; 1,000,000,000 shares authorized, 33,263,309 and 32,375,299 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	33	32
Additional paid-in capital	188,923	176,641
Accumulated other comprehensive loss	(1,269)	(1,088)
Accumulated deficit	(67,994)	(72,468)
Total stockholders’ equity	119,693	103,117
Total liabilities and stockholders’ equity	$ 215,411	$ 192,603