Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 32,536	$ 46,290
Accounts receivable, net	29,904	36,587
Inventories, net	107,816	95,789
Prepaid expenses and other current assets	5,739	6,242
Total current assets	175,995	184,908
Property, plant and equipment, net	30,880	32,006
Long-term restricted cash	825	825
Other assets	12,843	15,810
Total assets	220,543	233,549
Current liabilities
Accounts payable	14,699	19,451
Accrued compensation	5,830	4,845
Warranty	1,160	1,316
Income taxes	545	417
Deferred revenue	4,867	4,387
Current portion of long-term debt	1,164	471
Other current liabilities	3,462	4,573
Total current liabilities	31,727	35,460
Long-term debt	13,651	14,529
Long-term deferred revenue	175	322
Other long-term liabilities	7,266	7,236
Total liabilities	52,819	57,547
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; 112,037 shares issued and 111,917 shares outstanding at September 30, 2014;110,225 shares issued and 110,105 shares outstanding at December 31, 2013	112	110
Additional paid-in capital	516,992	510,992
Treasury stock, at cost, 120 shares at September 30, 2014 and December 31, 2013	(1,218)	(1,218)
Accumulated deficit	(351,051)	(339,621)
Accumulated other comprehensive income	2,889	5,739
Total stockholders' equity	167,724	176,002
Total liabilities and stockholders' equity	$ 220,543	$ 233,549