CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net (loss) income	$ (3,419)	$ (3,573)	$ 3,803
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Stock-based compensation	4,334	7,342	6,356
Depreciation and amortization	3,965	4,557	3,083
Amortization of intangible assets	4,003	4,181	1,319
Loss on write-off of property and equipment	220	187	0
Change in carrying value of preferred stock liability	0	0	33
Allowance for doubtful accounts and sales returns reserve	57	(56)	119
Facilities exit costs	0	618	0
Impairment of long-lived assets and goodwill	0	8,501	0
Excess tax benefit from stock based awards	(422)	(328)	(319)
Gain on settlement and change in fair value of contingent consideration	0	(8,145)	(1,034)
Gain on sale-leaseback of building	0	0	(1,689)
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	(3,877)	(1,591)	(3,911)
Deferred tax asset, current and non-current	1,812	(2,920)	4,495
Prepaid expenses and other assets	(40)	797	(1,165)
Accounts payable	130	27	1,210
Deferred revenue	(10,587)	(379)	(7,464)
Other accrued liabilities and other payables	(772)	(399)	4,276
Net cash (used in) provided by operating activities	(4,596)	8,819	9,112
Cash flows from investing activities:
Purchase of property and equipment	(4,516)	(10,064)	(4,657)
Business acquisitions	0	0	(14,600)
Purchase of short-term investments	(20,083)	(24,849)	(27,793)
Sale of short-term investments	0	8,590	1,797
Decrease in restricted cash	0	500	0
Maturity of short-term investments	10,680	24,800	11,725
Net cash used in investing activities	(13,919)	(1,023)	(33,528)
Cash flows from financing activities:
Net cash proceeds from issuance of common stock	0	64,188	0
Payment and settlement of contingent consideration	0	(6,871)	0
Acquisition of common stock	0	0	(3,491)
Payment of accrued dividends on Series B mandatorily redeemable convertible preferred stock	0	(29,586)	0
Excess tax benefit from stock-based compensation awards	422	328	319
Proceeds from exercise of common stock options	1,711	3,484	2,680
Net cash provided by (used in) financing activities	2,133	31,543	(492)
Net (decrease) increase in cash and cash equivalents	(16,382)	39,339	(24,908)
Cash and cash equivalents at beginning of period	75,326	35,987	60,895
Cash and cash equivalents at end of period	58,944	75,326	35,987
Supplemental Disclosures:
Cash paid for income taxes	11	691	0
Cash refunded for income taxes	(9)	(293)	(969)
Cash paid for interest	0	0	214
Non-Cash Investing and Financing Activities:
Stock-based compensation capitalized in capitalized software	85	130	0
Retirement of treasury stock	0	0	2,596
Unrealized gain (loss) on available-for-sale securities, net of tax effect	1	(1)	0
Dividend accrued on Series B mandatorily redeemable convertible preferred stock	0	255	2,840
Accrued purchase of property and equipment and other assets	24	62	(843)
Contingent consideration recorded in connection with business acquisitions	0	0	14,750
Conversion of mandatorily redeemable convertible preferred stock into common stock	0	44,011	0
Reclassification of costs of issuance of common stock from prepaid expenses and other current assets	$ 0	$ 2,025	$ 0