Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 35,588	$ 46,290
Accounts receivable, net	32,067	36,587
Inventories, net	106,650	95,789
Prepaid expenses and other current assets	7,572	6,242
Total current assets	181,877	184,908
Property, plant and equipment, net	31,340	32,006
Long-term restricted cash	825	825
Other assets	12,539	15,810
Total assets	226,581	233,549
Current liabilities:
Accounts payable	17,379	19,451
Accrued compensation	3,975	4,845
Warranty	1,326	1,316
Income taxes	430	417
Deferred revenue	4,227	4,387
Current portion of long-term debt	1,054	471
Other current liabilities	3,681	4,573
Total current liabilities	32,072	35,460
Long-term debt	13,946	14,529
Long-term deferred revenue	101	322
Other long-term liabilities	7,136	7,236
Total liabilities	53,255	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; 111,643 shares issued and 111,523 shares outstanding at June 30, 2014; 110,225 shares issued and 110,105 shares outstanding at December 31, 2013	112	110
Additional paid-in capital	514,946	510,992
Treasury stock, at cost, 120 shares at June 30, 2014 and December 31, 2013	(1,218)	(1,218)
Accumulated deficit	(346,347)	(339,621)
Accumulated other comprehensive income	5,833	5,739
Total stockholders' equity	173,326	176,002
Total liabilities and stockholders' equity	$ 226,581	$ 233,549