Unaudited Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 455,152,000	$ 435,345,000
Accounts receivable, net of allowances of $813 and $1,044, respectively	36,232,000	39,833,000
Inventories	28,560,000	28,114,000
Prepaid expenses and other current assets	9,625,000	8,934,000
Total current assets	529,569,000	512,226,000
Non-current assets:
Property and equipment, net	61,519,000	63,493,000
Intangible assets, net	51,128,000	52,693,000
Operating lease right-of-use assets	32,473,000	33,690,000
Other non-current assets, net of allowances of $375 and $375, respectively	13,043,000	11,486,000
Total non-current assets	158,163,000	161,362,000
Total assets	687,732,000	673,588,000
Current liabilities:
Accounts payable	11,322,000	11,013,000
Accrued liabilities	94,134,000	83,009,000
Deferred revenue	3,759,000	3,113,000
Current portion of long-term debt		341,000,000
Total current liabilities	109,215,000	438,135,000
Non-current liabilities:
Long-term debt	1,163,822,000	827,968,000
Non-current operating lease liabilities	36,354,000	38,018,000
Other non-current liabilities	9,844,000	10,581,000
Total non-current liabilities	1,210,020,000	876,567,000
Total liabilities	1,319,235,000	1,314,702,000
Commitments and contingencies (Note 13)
Stockholders’ deficit
Common stock, par value $0.0001 per share; 500,000,000 shares authorized at March 31, 2021 and December 31, 2020; 97,158,550 and 91,086,191 shares issued at March 31, 2021 and December 31, 2020, respectively; and 92,071,085 and 85,990,499 shares outstanding at March 31, 2021 and December 31, 2020, respectively	9,000	9,000
Additional paid-in capital	1,080,305,000	1,088,590,000
Accumulated other comprehensive loss	(912,000)	(1,013,000)
Treasury stock, at cost	(98,857,000)	(98,857,000)
Accumulated deficit	(1,612,048,000)	(1,629,843,000)
Total stockholders’ deficit	(631,503,000)	(641,114,000)
Total liabilities and stockholders’ deficit	$ 687,732,000	$ 673,588,000