CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (4,700)	$ (1,903)
Adjustments to reconcile net loss to cash provided by operating activities:
Stock-based compensation expense	1,668	1,635
Bad debt expense	(238)	165
Depreciation and amortization	2,372	2,436
Deferred income tax benefit	298	(1,314)
Loss on disposal of equipment	141	32
Net change in:
Restricted cash	32	23
Accounts receivable	11,135	17,575
Inventory	(746)	(709)
Prepaid expenses and other current assets	(2,559)	503
Income tax receivable	413	(1,236)
Other assets	5	(1,209)
Accounts payable	(209)	(587)
Accrued compensation	(6,412)	(2,076)
Other current liabilities	(4,253)	(8,020)
Excess tax benefit from stock options exercised	0
Other long term liabilities	371	1,587
Deferred revenue	(2,953)	(4,246)
Net cash provided by (used in) operating activities	(5,635)	2,656
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(2,528)	(967)
Proceeds from (purchases of) available-for-sale securities		3,307
Net cash provided by (used in) investing activities	(2,528)	2,340
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the exercise of stock options	349
Payments under capital lease obligations	(193)	(2)
Net cash provided by (used in) financing activities	156	(2)
Increase (decrease) in cash and cash equivalents	(8,007)	4,994
Effect of exchange rate changes in cash and cash equivalents	(872)	563
Net increase (decrease) in cash and cash equivalents	(8,879)	5,557
Cash and cash equivalents-beginning of year	148,190	106,516
Cash and cash equivalents-end of period	139,311	112,073
Cash paid during the periods for:
Interest	1
Income taxes	1,175	1,431
Noncash financing and investing activities:
Accrued liability for purchase of property and equipment	763	584
Equipment acquired under capital lease	$ 586