Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 14,578	$ 14,354
Accounts receivable, net of allowance for doubtful accounts of $619 as of September 30, 2012 and $684 as of December 31, 2011	26,245	15,660
Advance billings	3,346	1,720
Inventories	34,126	33,309
Prepaid expenses and other current assets	5,267	4,561
Total current assets	83,562	69,604
Property and equipment, net	9,216	7,387
Intangibles, net	250	500
Restricted cash	2,087	1,877
Other assets	808	701
Total assets	95,923	80,069
Current liabilities:
Accounts payable	26,624	11,767
Accrued compensation and benefits	2,713	4,496
Deferred revenue-current	9,107	6,189
Revolving credit facility	14,000	0
Other current liabilities	4,122	7,518
Total current liabilities	56,566	29,970
Deferred revenues, non-current	1,971	3,059
Other long-term liabilities	3,237	3,748
Total liabilities	61,774	36,777
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; 63,384 shares issued and 59,203 shares outstanding as of December 31, 2013; 62,908 shares issued and 58,727 shares outstanding as of December 31, 2012	63	63
Additional paid-in capital	654,050	652,041
Accumulated other comprehensive income	20,830	21,007
Treasury stock, 4,181 shares as of December 31, 2013 and December 31, 2012	(37,986)	(37,986)
Accumulated deficit	(602,808)	(591,833)
Total stockholders' equity	34,149	43,292
Total liabilities and stockholders' equity	$ 95,923	$ 80,069