Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Schedule of Future Minimum Lease Payment Commitments (Details)

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Commitments and Contingencies - Schedule of Future Minimum Lease Payment Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Rental expense $ 5,000 $ 3,500 $ 3,900
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity      
2019 4,717    
2020 4,133    
2021 3,451    
2022 3,163    
2023 2,487    
Total 17,951    
Purchase commitments outstanding $ 155,000