Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 21,974	$ 56,525
Trade accounts receivable, net	4,894	4,913
Inventory, net	15,014	16,251
Prepaid expenses and other current assets	2,451	2,210
Total current assets	44,333	79,899
Property and equipment, net	14,091	14,590
Other assets	6,472	6,151
Total assets	64,896	100,640
Current liabilities:
Accounts payable	4,733	5,168
Accrued expenses	12,390	11,093
Accrued compensation	3,377	3,805
Revolving credit facility	4,694	5,081
Long-term debt, current portion	11,627	9,758
Deferred revenue, current portion	0	8,462
Total current liabilities	36,821	43,367
Long-term debt, less current portion	36,120	42,070
Other long-term liabilities	6,963	5,891
Commitments and contingencies
Stockholders' equity:
Common stock	66	65
Additional paid-in capital	294,392	291,252
Accumulated deficit	(309,466)	(282,005)
Total stockholders' equity	(15,008)	9,312
Total liabilities and stockholders' equity	$ 64,896	$ 100,640