Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 16,184	$ 39,652
Short-term investments	100,647	88,024
Accounts receivable, net of allowance	15,962	23,543
Other receivables	867	882
Inventories	4,230	5,665
Prepaid expenses and other current assets	2,675	1,892
Total current assets	140,565	159,658
Property and equipment, net	5,191	5,365
Intangible assets, net	3,396	1,544
Goodwill	9,988	5,575
Other long-term assets	889	965
Total assets	160,029	173,107
Current liabilities
Accounts payable	2,504	3,531
Accrued payroll and other current liabilities	10,381	9,841
Deferred revenue, current	25,712	26,133
Total current liabilities	38,597	39,505
Deferred revenue, long-term	6,479	6,398
Other long-term liabilities	1,782	1,641
Total liabilities	46,858	47,544
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, $0.0003 par value - 5,000,000 shares authorized as of September 30, 2014 and December 31, 2013; zero shares issued and outstanding	0	0
Common stock, $0.0003 par value - 100,000,000 shares authorized as of September 30, 2014 and December 31, 2013; 25,483,049 and 24,967,140 shares issued and outstanding as of September 30, 2014 and December 31, 2013, respectively	8	7
Additional paid-in capital	198,915	189,966
Accumulated other comprehensive (loss) income	(31)	23
Accumulated deficit	(85,721)	(64,433)
Total stockholders’ equity	113,171	125,563
Total liabilities and stockholders’ equity	$ 160,029	$ 173,107