Financial Statements Details - Contract Balances (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Change in Contract with Customer, Asset [Roll Forward]
Contract assets, beginning balance	$ 6,959,000	$ 0
Less: Beginning balance reclassified to accounts receivable upon invoice	(1,505,000)	0
Add: Contract assets recognized	3,963,000	9,417,000
Contract assets, ending balance	9,417,000	9,417,000
Change in Contract with Customer, Liability [Roll Forward]
Contract liabilities, beginning balance	21,842,000	16,521,000
Less: Revenue recognized from beginning balance	(2,157,000)	(6,107,000)
Less: Beginning balance reclassified to deferred revenue	(970,000)	(521,000)
Add: Contract liabilities recognized	6,580,000	15,402,000
Contract liabilities, ending balance	25,295,000	25,295,000
Contract liabilities included in other current liabilities	$ 10,900,000	$ 10,900,000