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Summary of Significant Accounting Policies - Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Apr. 01, 2019	Jan. 01, 2019
Recent Accounting Pronouncements
Operating lease right-of-use asset	$ 12,146
Operating lease liability	$ 12,967
Practical Expedients, Package	true
Practical Expedient, Use of Hindsight	false
Finance lease right-of-use asset	$ 53,343
Total Finance lease liabilities	69,238
Aliso Facility
Recent Accounting Pronouncements
Finance lease right-of-use asset		$ 54,500
Total Finance lease liabilities		$ 67,200
Finance lease incentive assets, current	$ 12,700
ASU No 2016-02 Leases | Adjustment
Recent Accounting Pronouncements
Operating lease right-of-use asset			$ 12,800
Operating lease liability			$ 13,400

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Present value of lessee's discounted obligation for lease payments from finance lease.

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