Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 10,073	$ 7,475
Short-term investments	16,972	38,497
Accounts receivable, net of allowances for doubtful accounts and other adjustments of $391 (2012) and $1,382 (2011)	9,342	8,525
Income tax receivable	7,543	8,293
Inventories, net of reserves for excess and obsolete inventory of $321 (2012) and $417 (2011)	224	309
Prepaid expenses and other current assets	1,329	1,138
Deferred tax asset	8	8
Total current assets	45,491	64,245
Equipment and improvements, net	12,277	15,482
Other assets	182	214
Total assets	57,950	79,941
Current liabilities:
Accounts payable	2,014	3,181
Accrued liabilities	4,699	7,641
Deferred revenue	1,867	703
Total current liabilities	8,580	11,525
Non-current liabilities:
Long-term liabilities	3,432	3,546
Deferred tax liability	10	10
Total non-current liabilities	3,442	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; 35,883,267 and 35,611,976 shares issued and outstanding at September 30, 2012 and December 31, 2011, respectively	36	36
Additional paid-in capital	210,276	207,927
Accumulated comprehensive deficit	(164,384)	(143,103)
Total stockholders' equity	45,928	64,860
Total liabilities and stockholders' equity	$ 57,950	$ 79,941