Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 22,760	$ 14,578
Accounts receivable, net of allowance for doubtful accounts of $669 as of December 31, 2014 and $704 as of December 31, 2013	33,578	26,245
Advance billings	4,653	3,346
Inventories	40,579	34,126
Prepaid expenses and other current assets	9,767	5,267
Total current assets	111,337	83,562
Property and equipment, net	7,534	9,216
Intangibles, net	0	250
Restricted cash	1,993	2,087
Other assets	623	808
Total assets	121,487	95,923
Current liabilities:
Accounts payable	22,434	26,624
Accrued compensation and benefits	4,601	2,713
Deferred revenues, current	9,110	9,107
Revolving credit facility		14,000
Other current liabilities	6,630	4,122
Total current liabilities	42,775	56,566
Deferred revenues, non-current	1,160	1,971
Other liabilities	2,442	3,237
Total liabilities	46,377	61,774
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, 2,000 shares authorized; none issued and outstanding	0	0
Common stock, par value $0.001, 120,000 shares authorized; 78,267 shares issued and 74,009 shares outstanding as of December 31, 2014; 63,384 shares issued and 59,203 shares outstanding as of December 31, 2013	78	63
Additional paid-in capital	687,871	654,050
Accumulated other comprehensive income	18,171	20,830
Treasury stock, 4,258 shares as of December 31, 2014 and 4,181 shares as of December 31, 2013	(38,083)	(37,986)
Accumulated deficit	(592,927)	(602,808)
Total stockholders' equity	75,110	34,149
Total liabilities and stockholders' equity	$ 121,487	$ 95,923