Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 149,412	$ 26,685
Accounts receivable, net	42,766	26,148
Prepaid expenses and other current assets	7,815	6,369
Total current assets	199,993	59,202
Property and equipment, net	314,179	262,359
Goodwill	59,640	42,403
Intangible assets, net	19,152	10,263
Other assets	9,936	10,082
Total assets	602,900	384,309
Current liabilities:
Accounts payable	21,543	11,589
Accrued expenses and other liabilities	62,653	42,405
Deferred revenue	80,383	61,708
Current portion of long-term debt	0	875
Current portion of capital leases and notes payable	6,612	5,771
Total current liabilities	171,191	122,348
Deferred revenue, net of current portion	137,205	149,168
Long-term debt	151,670	0
Long-term portion of capital leases and notes payable	4,911	6,747
Deferred tax liabilities	1,073	1,004
Other liabilities	6,728	6,012
Total liabilities	472,778	285,279
Commitments and contingencies (Note 15)
Stockholders' equity:
Preferred stock, $0.0001 par value; 5,000 shares authorized; no shares issued and outstanding
Common stock, $0.0001 par value; 100,000 shares authorized; 42,669 and 40,995 shares issued and outstanding for 2018 and 2017, respectively	4	4
Additional paid-in capital	259,132	230,679
Accumulated deficit	(129,930)	(131,967)
Accumulated other comprehensive loss	(1,295)	(898)
Total common stockholders' equity	127,911	97,818
Non-controlling interests	2,211	1,212
Total stockholders' equity	130,122	99,030
Total liabilities and stockholders' equity	$ 602,900	$ 384,309