Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 143,069	$ 147,539
Accounts receivable, net of allowances of $2,263 and $2,069 at March 31, 2015 and December 31, 2014, respectively (includes related party receivables of $1,925 and $1,865 at March 31, 2015 and December 31, 2014, respectively)	28,939	28,748
Prepaid expenses (includes related party prepaid expenses of $806 and $906 at March 31, 2015 and December 31, 2014, respectively)	4,585	5,193
Other current assets	1,081	3,040
Total current assets	177,674	184,520
Property and equipment, net	56,127	30,731
Goodwill	53,270	53,270
Intangible assets, net	26,914	27,949
Other assets	688	482
Total assets	314,673	296,952
Current liabilities
Accounts payable (includes related party payables of $5,079 and $4,954 at March 31, 2015 and December 31, 2014, respectively)	12,339	12,826
Accrued employee expenses	6,839	14,245
Accrued expenses and other current liabilities	15,124	11,783
Total current liabilities	34,302	38,854
Deferred tax liabilities	2,448	2,245
Lease financing obligations, net of current portion	26,554	6,093
Other liabilities	626	562
Total liabilities	63,930	47,754
Commitments and contingencies (Note 7)
Stockholders' Equity
Preferred stock — $0.0001 par value; 20,000,000 shares authorized at March 31, 2015 and December 31, 2014; no shares issued and outstanding at March 31, 2015 and December 31, 2014
Common stock — $0.0001 par value; 1,000,000,000 shares authorized at March 31, 2015 and December 31, 2014; 81,660,918 and 79,811,769 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively	8	8
Additional paid-in capital	473,347	460,179
Accumulated deficit	(222,612)	(210,989)
Total stockholders' equity	250,743	249,198
Total liabilities and stockholders’ equity	$ 314,673	$ 296,952