Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 46,290	$ 44,986
Accounts receivable, net	36,587	24,843
Inventories, net	95,789	100,234
Restricted cash		106
Prepaid expenses and other current assets	6,242	5,056
Total current assets	184,908	175,225
Property, plant and equipment, net	32,006	34,413
Long-term restricted cash	825
Other assets	15,810	12,520
Total assets	233,549	222,158
Current liabilities
Accounts payable	19,451	10,166
Accrued compensation	4,845	7,283
Warranty	1,316	1,700
Income taxes	417	278
Deferred revenue	4,387	6,423
Current portion of long-term debt	471
Other current liabilities	4,573	3,932
Total current liabilities	35,460	29,782
Long-term debt	14,529
Long-term deferred revenue	322	456
Other long-term liabilities	7,236	5,844
Total liabilities	57,547	36,082
Commitments and contingencies (Note 16)
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; 110,225 shares issued and 110,105 shares outstanding at December 31, 2013; 108,293 shares issued and 108,173 shares outstanding at December 31, 2012	110	108
Additional paid-in capital	510,992	504,643
Treasury stock, at cost, 120 shares at December 31, 2013 and 2012	(1,218)	(1,218)
Accumulated deficit	(339,621)	(322,477)
Accumulated other comprehensive income	5,739	5,020
Total stockholders' equity	176,002	186,076
Total liabilities and stockholders' equity	$ 233,549	$ 222,158