Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 37,775	$ 39,638
Trade accounts receivable, less allowance for doubtful accounts and sales returns of $589 and $602, respectively	19,945	18,123
Inventories, net	9,288	8,542
Deferred income taxes, current portion, net	313	610
Prepaid expenses and other current assets	2,506	2,421
Total current assets	69,827	69,334
Property and equipment, net	27,006	27,249
Goodwill	13,296	11,569
Other intangible assets, net	20	111
Other assets	620	773
Total assets	110,769	109,036
Current liabilities:
Accounts payable	1,996	1,521
Accrued liabilities	16,001	24,256
Deferred revenue	2,196	2,183
Total current liabilities	20,193	27,960
Accrued liabilities, net of current portion	991	706
Deferred income taxes, noncurrent portion, net	888	860
Total liabilities	22,072	29,526
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, $0.001 par value. Authorized 5,000,000 shares; none issued	0	0
Common stock, $0.001 par value. Authorized 60,000,000 shares; issued and outstanding 34,887,763 and 33,957,408 shares, respectively	35	34
Additional paid-in capital	183,140	176,277
Accumulated other comprehensive loss	(618)	(715)
Accumulated deficit	(93,860)	(96,086)
Total stockholders’ equity	88,697	79,510
Total liabilities and stockholders’ equity	$ 110,769	$ 109,036