Significant Accounting Policies - Schedule of Concentrations of Risk Percentage (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Customer A | Revenue
Significant Accounting Policies [Line Items]
Concentration risk, percentage	13.90%	18.40%	31.40%
Customer A | Accounts Receivable, Net
Significant Accounting Policies [Line Items]
Concentration risk, percentage	41.80%
Customer B | Revenue
Significant Accounting Policies [Line Items]
Concentration risk, percentage		13.50%
Customer B | Accounts Receivable, Net
Significant Accounting Policies [Line Items]
Concentration risk, percentage		15.10%
Customer C | Revenue
Significant Accounting Policies [Line Items]
Concentration risk, percentage		15.40%
Customer C | Accounts Receivable, Net
Significant Accounting Policies [Line Items]
Concentration risk, percentage		13.20%
Genentech, Inc. | Revenue
Significant Accounting Policies [Line Items]
Concentration risk, percentage	42.10%