Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 86,228,000	$ 85,803,000
Accounts receivable (net of allowances of $998 and $3,587 as of December 31, 2014 and 2013, respectively)	40,268,000	39,771,000
Inventories	10,703,000	15,238,000
Short-term investments	75,000	75,000
Prepaid expenses and other current assets	2,597,000	2,524,000
Deferred tax assets	326,000	6,000
Total current assets	140,197,000	143,417,000
Property and equipment, net	1,848,000	843,000
Goodwill	34,521,000	35,357,000
Other assets	5,265,000	242,000
Total assets	181,831,000	179,859,000
Current liabilities:
Accounts payable	5,311,000	7,716,000
Accrued and other current liabilities	20,536,000	20,938,000
Deferred revenue	596,000	2,915,000
Short-term borrowings on loan facility		1,651,000
Total current liabilities	26,443,000	33,220,000
Other long-term liabilities	114,000	44,000
Commitments and contingencies (Notes 11 and 19)
Stockholders' equity:
Preferred stock; $0.001 par value; 10,000,000 shares authorized; no shares issued and outstanding
Common stock; $0.001 par value; 100,000,000 shares authorized; 49,948,897 and 52,371,664 shares issued and outstanding as of December 31, 2014 and 2013, respectively	50,000	52,000
Additional paid-in capital	287,108,000	278,327,000
Accumulated other comprehensive income	3,264,000	4,176,000
Accumulated deficit	(135,148,000)	(135,960,000)
Total stockholders' equity	155,274,000	146,595,000
Total liabilities and stockholders' equity	$ 181,831,000	$ 179,859,000