Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 43,039	$ 46,290
Accounts receivable, net	38,121	36,587
Inventories, net	95,533	95,789
Prepaid expenses and other current assets	7,476	6,242
Total current assets	184,169	184,908
Property, plant and equipment, net	31,605	32,006
Long-term restricted cash	825	825
Other assets	16,104	15,810
Total assets	232,703	233,549
Current liabilities
Accounts payable	17,865	19,451
Accrued compensation	4,692	4,845
Warranty	1,496	1,316
Income taxes	474	417
Deferred revenue	3,836	4,387
Current portion of long-term debt	762	471
Other current liabilities	4,100	4,573
Total current liabilities	33,225	35,460
Long-term debt	14,238	14,529
Long-term deferred revenue	257	322
Other long-term liabilities	7,058	7,236
Total liabilities	54,778	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; 111,269 shares issued and 111,149 shares outstanding at March 31, 2014;110,225 shares issued and 110,105 shares outstanding at December 31, 2013	111	110
Additional paid-in capital	513,411	510,992
Treasury stock, at cost, 120 shares at March 31, 2014 and December 31, 2013	(1,218)	(1,218)
Accumulated deficit	(339,447)	(339,621)
Accumulated other comprehensive income	5,068	5,739
Total stockholders' equity	177,925	176,002
Total liabilities and stockholders' equity	$ 232,703	$ 233,549