CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 334,171	$ 78,823
Marketable securities	169,860
Restricted cash	67,154	2,947
Accounts receivable	12,355	7,500
Unbilled services	3,826
Prepaid expenses and other current assets	83,851	7,977
Total current assets	671,217	97,247
Restricted cash	411	410
Property and equipment, net	131,834	11,445
Intangible assets, net	5,332	5,581
Goodwill	126,932	51,154
Other non-current assets	8,294	7,120
Total assets	944,020	172,957
Current liabilities:
Accounts payable	15,097	2,910
Accrued expenses	78,812	14,867
Accrued interest	2,031	5,078
Deferred revenue	81,814	1,678
Current portion of finance lease liabilities	55,860
Other current liabilities	5,604	1,262
Total current liabilities	239,218	25,795
Deferred revenue	2,500	2,500
Convertible notes payable	321,679	320,611
Non-current finance lease liabilities	63,099
Other non-current liabilities	11,262	10,068
Total liabilities	637,758	358,974
Commitments and contingencies
Preferred stock, $0.01 par value, 2,000,000 shares authorized; 438,885 shares of redeemable Series A Convertible Preferred Stock issued and outstanding at September 30, 2020 and no shares issued and outstanding at December 31, 2019	199,822
Stockholders' deficit:
Common stock, $0.01 par value, 600,000,000 shares authorized at September 30, 2020 and 2019; and 63,318,888 shares issued and 62,927,485 shares outstanding at September 30, 2020 and 32,399,352 shares issued and 32,352,416 shares outstanding at December 31, 2019	633	324
Additional paid-in capital	1,848,644	1,260,551
Accumulated deficit	(1,696,635)	(1,431,801)
Treasury stock, 391,403 shares, cost basis at September 30, 2020 and 46,936 shares, cost basis at December 31, 2019	(41,207)	(2,583)
Accumulated other comprehensive loss	(4,995)	(12,508)
Total stockholders' equity (deficit)	106,440	(186,017)
Total liabilities and stockholders' equity (deficit)	$ 944,020	$ 172,957