Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 133,496	$ 137,439
Accounts receivable, net of allowances of $3,078 and $2,673 as of March 31, 2013 and December 31, 2012, respectively	53,981	59,179
Prepaid expenses and other current assets	1,675	1,966
Total current assets	189,152	198,584
Long-term assets:
Property and equipment, net	7,808	6,850
Goodwill	1,348	1,348
Intangible assets, net	847	913
Other assets	687	754
Total long-term assets	10,690	9,865
Total assets	199,842	208,449
Current liabilities:
Accounts payable and accrued expenses	4,415	3,788
Accrued cost of revenue	29,537	34,430
Accrued payroll and payroll related expenses	3,753	6,038
Deferred revenue	267	169
Total current liabilities	37,972	44,425
Other long-term liabilities	277	243
Total liabilities	38,249	44,668
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized, no shares issued and outstanding as of March 31, 2013 and December 31, 2012
Common stock, $0.001 par value, 250,000,000 shares authorized, 79,460,901 and 79,182,913 shares issued and outstanding as of March 31, 2013 and December 31, 2012, respectively	79	79
Additional paid-in capital	215,421	213,823
Accumulated other comprehensive loss	(111)	(78)
Accumulated deficit	(53,796)	(50,043)
Total stockholders' equity	161,593	163,781
Total liabilities and stockholders' equity	$ 199,842	$ 208,449