Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 112,999	$ 43,819
Restricted cash — current		2,000
Accounts receivable, net of allowances of $2,120 and $2,184 at September 30, 2014 and December 31, 2013, respectively (includes related party receivables of $769 and $431 at September 30, 2014 and December 31, 2013, respectively)	28,953	18,803
Notes receivable from related parties — current	380	178
Prepaid expenses (includes related party prepaid expenses of $1,376 at September 30, 2014)	6,239	3,550
Other current assets (includes related party receivables of $363 at December 31, 2013)	1,827	1,226
Total current assets	150,398	69,576
Property and equipment, net	28,688	15,238
Goodwill	53,270	53,270
Intangible assets, net	28,984	31,834
Notes receivable from related parties		2,682
Other assets	427	2,150
Total assets	261,767	174,750
Current liabilities
Accounts payable (includes related party payables of $366 and $1,161 at September 30, 2014 and December 31, 2013, respectively)	12,350	9,804
Accrued employee expenses	9,778	10,129
Revolving line of credit	5,000	4,764
Other accrued expenses (includes related party payables of $259 at December 31, 2013)	11,296	6,242
Total current liabilities	38,424	30,939
Deferred tax liabilities	2,223	1,791
Lease financing obligation	5,970
Other liabilities	473	616
Total liabilities	47,090	33,346
Commitments and contingencies (Note 7)
Series A convertible preferred stock — $0.0001 par value; 4,500,000 shares authorized at December 31, 2013; no shares and 2,857,143 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively		29,224
Stockholders' Equity
Preferred stock — $0.0001 par value; 20,000,000 shares authorized at September 30, 2014; no shares issued and outstanding at September 30, 2014 and December 31, 2013
Common stock — $0.0001 par value; 1,000,000,000 shares authorized at September 30, 2014 and 150,000,000 shares authorized at December 31, 2013; 76,983,001 and 59,955,343 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	8	6
Additional paid-in capital	415,824	275,803
Notes receivable from related parties		(1,069)
Accumulated deficit	(201,155)	(162,560)
Total stockholders' equity	214,677	112,180
Total liabilities, convertible preferred stock and stockholders' equity	$ 261,767	$ 174,750