Commitments and Contingencies - Capital Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Jun. 30, 2016	Dec. 31, 2015
Future minimum lease payments
Aggregate sale price in sale-leaseback transaction	$ 4,500
Restricted Cash
Cash held in escrow deposit		$ 46,900
Letter of credit with Silicon Valley Bank		1,000
Capital Leases
Future minimum lease payments
Remainder of 2016		364
2017		9,425
2018		6,743
2019		1,662
2020		2,118
Thereafter		3,682
Total future minimum lease payments		23,994
Cash received for future services		14,000	$ 15,100
Long-term debt | Capital Leases
Sale Leaseback Transaction [Line Items]
Sale-leaseback liability		24,000
Finance obligation
Sale Leaseback Transaction [Line Items]
Sale-leaseback liability		$ 2,400	$ 2,500