Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 10,966	$ 7,475
Short-term investments	20,289	38,497
Accounts receivable, net of allowances for doubtful accounts and other adjustments of $462 (2012) and $1,382 (2011)	8,385	8,525
Income tax receivable	7,687	8,293
Inventories, net of reserves for excess and obsolete inventory of $312 (2012) and $417 (2011)	236	309
Prepaid expenses and other current assets	1,554	1,138
Deferred tax asset	8	8
Total current assets	49,125	64,245
Equipment and improvements, net	13,181	15,482
Other assets	181	214
Total assets	62,487	79,941
Current liabilities:
Accounts payable	1,720	3,181
Accrued liabilities	6,392	7,641
Deferred revenue	1,172	703
Total current liabilities	9,284	11,525
Non-current liabilities:
Long-term liabilities	3,363	3,546
Deferred tax liability	10	10
Total non-current liabilities	3,373	3,556
Commitments and contingencies
Stockholders' equity:
Preferred stock, par value $0.001 per share; 5,000,000 shares authorized; none issued or outstanding
Common stock, par value $0.001 per share; 100,000,000 shares authorized; 35,873,338 and 35,611,976 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively	36	36
Additional paid-in capital	209,373	207,927
Accumulated comprehensive deficit	(159,579)	(143,103)
Total stockholders' equity	49,830	64,860
Total liabilities and stockholders' equity	$ 62,487	$ 79,941