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Commitments and Contingencies (Narrative) (Details)				1 Months Ended		3 Months Ended	12 Months Ended
	Jan. 19, 2019 USD ($)	Dec. 18, 2018 lawsuit	Jul. 22, 2015 USD ($)	Jan. 04, 2019 lawsuit	Jan. 04, 2019 lawsuit	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) lawsuit	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)
Operating Leased Assets [Line Items]
Long-term restricted cash							$ 4,500,000	$ 4,500,000		$ 4,500,000
Deferred rent, non-current							13,765,000	14,453,000
Other purchase commitments							$ 13,100,000
Number of lawsuits filed | lawsuit							4
Attorneys' fees	$ 300,000
Loss contingency, accrual							$ 240,000
Additional liability associated with indemnification obligations							0
Subsequent Event [Member]
Operating Leased Assets [Line Items]
Number of lawsuits filed | lawsuit				5
Punitive Class Action, United States District Court for the Northern District of California [Member] | Subsequent Event [Member]
Operating Leased Assets [Line Items]
Number of lawsuits filed | lawsuit					3
Punitive Class Action, United States District Court for the District of Delaware [Member]
Operating Leased Assets [Line Items]
Number of lawsuits filed | lawsuit		1
O’Brien Lease Agreement [Member]
Operating Leased Assets [Line Items]
Lease term			132 months			11 years
Rent expense first twelve months			$ 540,000
Rent expense last twelve months			$ 711,000
Period in which payment must be received without incurring late charge			5 days
Late charge, percent			5.00%
Amount not paid after written notice, bear interest from date due until date paid, period			10 days
Long-term restricted cash										$ 4,500,000
Expected improvement allowance			$ 12,600,000
Tenant improvements						$ 28,800,000
Tenant allowance paid by landlord						12,600,000
Deferred rent, non-current						$ 12,600,000
Rent expense							$ 6,200,000	$ 6,300,000	$ 200,000
O’Brien Lease Agreement [Member] | Prime Rate [Member]
Operating Leased Assets [Line Items]
Basis spread on variable rate			2.00%

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