Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 40,297	$ 40,315
Accounts receivable, net	22,484	25,025
Inventories	4,944	5,037
Prepaid expenses and other assets	5,960	5,810
Total current assets	73,685	76,187
Property and equipment, net	7,645	7,147
Other assets	679	603
Total assets	82,009	83,937
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	23,055	22,659
Accrued compensation	3,443	4,863
Accrued expenses	6,888	8,690
Deferred revenue	3,559	2,889
Credit facility borrowings	2,800	2,800
Total current liabilities	39,745	41,901
Other long-term liabilities	3,385	3,261
Total liabilities	43,130	45,162
Commitments and Contingencies (Note 9)
Stockholders' Equity:
Preferred stock, $.001 par value, 10,000 shares authorized, zero shares issued and outstanding at December 31, 2012 and March 31, 2013	0	0
Common stock, $.001 par value, 100,000 shares authorized, 58,265 and 58,617 shares issued and outstanding at December 31, 2012 and March 31, 2013, respectively	58	58
Additional paid-in capital	327,516	326,575
Accumulated other comprehensive loss	(3,389)	(3,533)
Accumulated deficit	(285,306)	(284,325)
Total stockholders' equity	38,879	38,775
Total liabilities and stockholders' equity	$ 82,009	$ 83,937