Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 30,753	$ 46,290
Restricted cash	825
Accounts receivable, net	42,794	36,587
Inventories, net	104,063	95,789
Prepaid expenses and other current assets	6,700	6,242
Total current assets	185,135	184,908
Property, plant and equipment, net	30,464	32,006
Long-term restricted cash		825
Other assets	12,055	15,810
Total assets	227,654	233,549
Current liabilities
Accounts payable	21,605	19,451
Accrued compensation	4,232	4,845
Warranty	1,352	1,316
Income taxes	196	417
Deferred revenue	6,782	4,387
Current portion of long-term debt	14,530	471
Other current liabilities	3,401	4,573
Total current liabilities	52,098	35,460
Long-term debt		14,529
Long-term deferred revenue	449	322
Other long-term liabilities	6,755	7,236
Total liabilities	59,302	57,547
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; 112,849 shares issued and 112,729 shares outstanding at December 31, 2014; 110,225 shares issued and 110,105 shares outstanding at December 31, 2013	113	110
Additional paid-in capital	519,068	510,992
Treasury stock, at cost, 120 shares at December 31, 2014 and 2013	(1,218)	(1,218)
Accumulated deficit	(350,887)	(339,621)
Accumulated other comprehensive income	1,276	5,739
Total stockholders' equity	168,352	176,002
Total liabilities and stockholders' equity	$ 227,654	$ 233,549