Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 46,972	$ 40,401
Marketable securities	7,580	40,214
Accounts receivable, net	18,760	33,350
Prepaid expenses and other current assets	10,378	8,235
Total current assets	83,690	122,200
Property and equipment, net	399,293	380,243
Operating lease right-of-use assets, net	13,433	15,196
Goodwill	58,579	58,579
Intangible assets, net	11,664	14,940
Other assets	11,757	9,309
Total assets	578,416	600,467
Current liabilities:
Accounts payable	19,576	24,298
Accrued expenses and other liabilities	54,264	65,152
Deferred revenue	65,976	61,229
Current portion of operating leases	2,620	2,695
Current portion of long-term debt	778	778
Current portion of finance leases	1,147	2,721
Current portion of notes payable	218	1,527
Total current liabilities	144,579	158,400
Deferred revenue, net of current portion	164,794	166,660
Long-term portion of operating leases	15,216	17,357
Long-term debt	169,382	162,708
Long-term portion of finance leases	0	572
Long-term portion of notes payable	0	95
Deferred tax liabilities	1,005	993
Other liabilities	184	201
Total liabilities	495,160	506,986
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; 44,526 and 44,224 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	4	4
Additional paid-in capital	239,766	234,638
Accumulated deficit	(154,357)	(140,973)
Accumulated other comprehensive loss	(2,656)	(1,426)
Total common stockholders' equity	82,757	92,243
Non-controlling interests	499	1,238
Total stockholders' equity	83,256	93,481
Total liabilities and stockholders' equity	$ 578,416	$ 600,467