Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 70,847	$ 49,172
Trade accounts receivable	5,947	4,474
Inventory, net	17,204	18,293
Prepaid expenses and other current assets	2,422	2,251
Total current assets	96,420	74,190
Property and equipment, net	14,668	15,434
Other assets	5,795	4,644
Total assets	116,883	94,268
Liabilities and stockholders' equity
Accounts payable	4,415	5,580
Accrued expenses	10,529	9,439
Accrued compensation	3,428	3,604
Revolving credit facility	4,503	3,449
Long-term debt, current portion	6,640	3,519
Deferred revenue, current portion	6,251	9,973
Total current liabilities	35,766	35,564
Long-term debt, less current portion	44,870	19,934
Deferred rent	316	360
Deferred revenue, less current portion	4,688	9,376
Other long-term liabilities	1,077	300
Commitments and contingencies
Stockholders' equity:
Common stock	64	34
Additional paid-in capital	288,403	226,802
Accumulated deficit	(258,301)	(198,102)
Total stockholders' equity	30,166	28,734
Total liabilities and stockholders' equity	$ 116,883	$ 94,268