Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 39,652	$ 92,521
Short-term investments	88,024	34,989
Accounts receivable, net	23,543	21,697
Other receivables	882	550
Inventories	5,665	2,772
Prepaid expenses and other current assets	1,892	2,808
Total current assets	159,658	155,337
Property and equipment, net	5,365	3,631
Intangible assets, net	1,544	2,267
Goodwill	5,575	5,575
Other long-term assets	965	495
Total assets	173,107	167,305
Current liabilities
Accounts payable	3,531	2,854
Accrued payroll and other current liabilities	9,841	11,754
Deferred revenue, current	26,133	22,451
Total current liabilities	39,505	37,059
Deferred revenue, long-term	6,398	5,882
Other long-term liabilities	1,641	1,239
Total liabilities	47,544	44,180
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, $0.0003 par value - 5,000,000 shares authorized as of December 31, 2013 and December 31, 2012; zero shares issued and outstanding	0	0
Common stock, $0.0003 par value - 100,000,000 shares authorized as of December 31, 2013 and December 31, 2012; 24,967,140 and 24,229,356 shares issued and outstanding as of December 31, 2013 and December 31, 2012, respectively	7	7
Additional paid-in capital	189,966	177,081
Accumulated other comprehensive income	23	5
Accumulated deficit	(64,433)	(53,968)
Total stockholders’ equity	125,563	123,125
Total liabilities and stockholders’ equity	$ 173,107	$ 167,305