Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 50,182	$ 149,412
Marketable securities	36,594	0
Accounts receivable, net	49,446	42,766
Prepaid expenses and other current assets	8,965	7,815
Total current assets	145,187	199,993
Property and equipment, net	361,876	314,179
Operating lease right-of-use assets, net	15,647	0
Goodwill	58,579	59,640
Intangible assets, net	15,739	19,152
Other assets	9,406	9,936
Total assets	606,434	602,900
Current liabilities:
Accounts payable	28,497	21,543
Accrued expenses and other liabilities	55,707	62,653
Deferred revenue	63,510	80,383
Current portion of operating leases	2,911	0
Current portion of long-term debt	778	0
Current portion of finance leases	3,057	4,201
Current portion of notes payable	1,937	2,411
Total current liabilities	156,397	171,191
Deferred revenue, net of current portion	172,601	137,205
Long-term portion of operating leases	17,879	0
Long-term debt	160,568	151,670
Long-term portion of finance leases	1,149	3,293
Long-term portion of notes payable	218	1,618
Deferred tax liabilities	1,129	1,073
Other liabilities	307	6,728
Total liabilities	510,248	472,778
Commitments and contingencies (Note 14)
Stockholders' equity:
Preferred stock, $0.0001 par value; 5,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.0001 par value; 100,000 shares authorized; 44,121 and 42,669 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	4	4
Additional paid-in capital	232,286	259,132
Accumulated deficit	(135,801)	(129,930)
Accumulated other comprehensive loss	(1,543)	(1,295)
Total common stockholders' equity	94,946	127,911
Non-controlling interests	1,240	2,211
Total stockholders' equity	96,186	130,122
Total liabilities and stockholders' equity	$ 606,434	$ 602,900