Balance Sheet Components (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Prepaid expenses and other current assets
Prepaid expenses	$ 14,112	$ 7,183
Deposits	1,793	904
Other	1,083	3,362
Total prepaid expenses and other current assets	16,988	11,449
Capitalized contract costs
Capitalized contract costs	2,632,597	2,361,795
Accumulated amortization	(1,461,910)	(1,246,020)
Capitalized contract costs, net	1,170,687	1,115,775
Long-term notes receivables and other assets
RIC receivables, gross	146,457	143,065
RIC deferred interest	(31,652)	(34,164)
Security deposits	6,985	6,586
Investments	541	3,865
Other	300	467
Total long-term notes receivables and other assets, net	122,631	119,819
Accrued payroll and commissions
Accrued commissions	42,611	28,726
Accrued payroll	26,937	36,753
Total accrued payroll and commissions	69,548	65,479
Accrued expenses and other current liabilities
Accrued interest payable	25,764	28,885
Current portion of derivative liability	70,468	67,710
Service warranty accrual	8,835	8,813
Current portion of notes payable	8,100	8,100
Loss contingencies	1,831	3,131
Other	23,051	20,076
Total accrued expenses and other current liabilities	$ 138,049	$ 136,715