Commitments - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]
Purchase commitments cancellation notice period	30 days
Operating lease expiration year	2025
Rent expense	$ 1,600,000	$ 900,000	$ 1,600,000
Deposits for letters of credit	200,000
Minimum sublease rent incom	600,000
Liabilities for Indemnification rights and agreements	$ 0	$ 0	$ 0