Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 120,866	$ 128,395
Trade accounts receivable, less allowance for doubtful accounts and sales returns of $874 and $782, respectively	27,652	26,766
Inventories, net	9,828	9,476
Deferred income taxes, net	445	445
Prepaid expenses and other current assets	3,489	2,748
Total current assets	162,280	167,830
Property and equipment, net	28,747	28,281
Goodwill	14,846	14,846
Other intangible assets, net	5,472	5,609
Other assets	612	591
Total assets	211,957	217,157
Current liabilities:
Accounts payable	2,183	2,587
Accrued liabilities	15,986	18,819
Deferred revenue	1,640	1,819
Total current liabilities	19,809	23,225
Accrued liabilities, net of current portion	1,162	1,215
Contingent consideration, net of current portion	1,390	1,352
Deferred income taxes	1,449	1,365
Total liabilities	23,810	27,157
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, $.001 par value; authorized 5,000,000 shares; none issued	0	0
Common stock, $.001 par value; authorized 60,000,000 shares; issued and outstanding 41,554,200 and 41,230,286 shares, respectively	41	41
Additional paid-in capital	288,289	284,494
Accumulated other comprehensive loss	(292)	(305)
Accumulated deficit	(99,891)	(94,230)
Total stockholders’ equity	188,147	190,000
Total liabilities and stockholders’ equity	$ 211,957	$ 217,157