Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 198,487	$ 197,762
Accounts receivable, net of allowances of $2,769 and $3,030 at June 30, 2018 and December 31, 2017, respectively (includes related party receivables of $149 and $169 at June 30, 2018 and December 31, 2017, respectively)	42,849	39,169
Prepaid expenses	8,357	5,475
Other current assets	4,971	1,145
Total current assets	254,664	243,551
Property and equipment, net	70,956	70,710
Goodwill	53,270	53,270
Intangible assets, net	13,981	15,912
Other assets	5,188	1,391
Total assets	398,059	384,834
Current liabilities
Accounts payable (includes related party payables of $3,808 and $3,200 at June 30, 2018 and December 31, 2017, respectively)	18,445	18,620
Accrued employee expenses	6,691	6,568
Accrued expenses and other current liabilities (includes related party accrued expenses of $785 and $52 at June 30, 2018 and December 31, 2017, respectively)	14,769	12,790
Total current liabilities	39,905	37,978
Deferred tax liabilities	692	812
Lease financing obligations, net of current portion	29,293	29,129
Other liabilities	4,190	3,797
Total liabilities	74,080	71,716
Commitments and contingencies (Note 7)
Stockholders’ Equity
Preferred stock — $0.0001 par value; 20,000,000 shares authorized at June 30, 2018 and December 31, 2017, respectively; no shares issued and outstanding at June 30, 2018 and December 31, 2017	0	0
Common stock — $0.0001 par value; 1,000,000,000 shares authorized at June 30, 2018 and December 31, 2017; 101,606,400 and 100,428,656 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	10	10
Additional paid-in capital	684,807	664,192
Accumulated deficit	(360,838)	(351,084)
Total stockholders’ equity	323,979	313,118
Total liabilities and stockholders’ equity	$ 398,059	$ 384,834