Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 48,317	$ 44,986
Accounts receivable, net	29,321	24,843
Inventories, net	94,316	100,234
Restricted cash	1,583	106
Prepaid expenses and other current assets	5,066	5,056
Total current assets	178,603	175,225
Property, plant and equipment, net	32,311	34,413
Restricted cash, long-term	825
Other assets	15,542	12,520
Total assets	227,281	222,158
Current liabilities
Accounts payable	16,075	10,166
Accrued compensation	7,309	7,283
Warranty	1,461	1,700
Income taxes	262	278
Deferred revenue	3,911	6,423
Current portion of long-term debt	185
Other current liabilities	4,250	3,932
Total current liabilities	33,453	29,782
Long-term debt	14,815
Long-term deferred revenue	154	456
Other long-term liabilities	6,129	5,844
Total liabilities	54,551	36,082
Commitments and contingencies (Note 13)
Stockholders' equity
Preferred stock, $0.001 par value, 30,000 shares authorized; none issued or outstanding
Common stock, $0.001 par value, 300,000 shares authorized; 109,586 shares issued and 109,466 shares outstanding at September 30, 2013;108,293 shares issued and 108,173 shares outstanding at December 31, 2012	110	108
Additional paid-in capital	508,976	504,643
Treasury stock, at cost, 120 shares at September 30, 2013 and December 31, 2012	(1,218)	(1,218)
Accumulated deficit	(340,235)	(322,477)
Accumulated other comprehensive income	5,097	5,020
Total stockholders' equity	172,730	186,076
Total liabilities and stockholders' equity	$ 227,281	$ 222,158