CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 77,403	$ 76,568
Short-term investments	54,649	32,874
Accounts receivable, net	60,894	65,238
Deferred income taxes	177	389
Prepaid expenses and other	6,661	5,178
Total current assets	199,784	180,247
Property and equipment, net	30,275	34,513
Deferred income taxes, net of current portion	1,986	2,321
Other assets, net	794	1,057
Goodwill	6,334	6,334
Total assets	239,173	224,472
Current liabilities:
Accounts payable	2,505	3,293
Accrued taxes	1,801	1,056
Accrued compensation and benefits	18,873	15,738
Accrued liabilities and other	13,640	10,403
Obligations under capital leases	328	326
Total current liabilities	37,147	30,816
Obligations under capital leases, net of current portion	466	638
Other long-term liabilities	4,839	6,091
Total liabilities	42,452	37,545
Commitments and contingencies (Note 7)
Stockholders’ equity:
Common stock; $0.0001 par value; 1,000,000 shares authorized; 79,099 shares issued and 79,220 shares outstanding as of June 30, 2013; 75,758 shares issued and 75,637 shares outstanding as of December 31, 2012	8	8
Treasury stock	(441)	(441)
Additional paid-in capital	235,714	210,650
Accumulated deficit	(38,759)	(23,398)
Accumulated other comprehensive income	199	108
Total stockholders’ equity	196,721	186,927
Total liabilities and stockholders’ equity	$ 239,173	$ 224,472